Twenty-four hours a day, seven days a week, without exception (e.g., national holidays are not excluded)


The facility-based service arrangements that provide net locations and their associated points of connection with the transport service providers (such points of connection with the transport service providers are called Points of Presence (POPs).

Access Circuit

A dedicated facility, varying by type (e.g., analog, digital signal, or synchronous optical network) and by bandwidth, which is used to carry service(s) between an SDP and its POP.


An organizational entity of the United States Federal Government. Also used in this document to refer to a Government entity that is authorized to purchase Networx services.

Agency Hierarchy Code

The Agency Hierarchy Code designates the Agency to which services are to be invoiced and the level within the Agency where these costs are grouped. Except for the first 4 characters, the AHC is a 28 character string that belongs solely to the Agency; it is not to be tampered with by any other outside organization. The AHC is determined by the Agency and should follow that Agency’s rules concerning the setup of their
(A) Own budgetary accounting codes (I.E., should ultimately identify the office that will actually pay for the service being provided), and/or
(B) Reporting Requirements. The AHC may also be identified with whoever is actually receiving the service being provided.

Agency Service Request Number (ASRN)

Agency provided service request order number.

Alternate Government Contact

An individual who has been identified by an Agency to interface with the contractor at a specific location in the event the local government contact (LGC) is unavailable.

Anti-Virus Management (AVM)

AVM enables the detection and removal of computer viruses. Anti-virus software scans executable files, boot blocks and incoming traffic for malicious code.

Application Hosting Services (AHS)

Application Hosting Services take advantage of the Internet and economies of scale for the delivery of enterprise software applications. A contractor acting as an Applications Services Provider (ASP) installs and maintains mission-critical applications at one or more of its Internet Data Centers.

Asynchronous Transfer Mode (ATM)

Return to Top

A packet data and switching technique that transfers information by using fixed length 53 byte cells. The ATM system uses high- speed transmission and is a connection-based system.


Verification of the identity of a user, device, or other entity in a computer system, often as a prerequisite to allowing access to resources in a system.

Authorization Code

An assigned code that is dialed or verbally given by the user or passed to an operator to gain access to presubscribed Networx contractor provided services and features.

Authorized User

An organization that is authorized to use the Networx contract and/or associated systems, including all Federal Agencies, authorized Federal contractors, Agency-sponsored universities and laboratories, and when authorized by law or regulation, state, local, and tribal Governments, and other organizations. All organizations listed in General Services Administration (GSA) Order ADM 4800.2E (as updated) are also eligible.

Automatic Number Identification (ANI)

A service feature in which the directory number or equipment number of a calling station is automatically obtained.

Automatic Switched Transport Network

A technology that uses the Generalized MPLS signaling protocol to set up and monitor edge-to-edge transport connections. ASTN is a type of optical transport network that uses Multi-Protocol Label Switching (MPLS) signaling to specify both the Network-to- Network (NNI) interface and the User-to-Network (UNI) interlaces and manages optical paths to enable Agencies to contract multi- point-to-multi-point connections in different configurations and class-of-service options.


Availability is the ratio of the time during which a service is available to the user (e.g., to originate and terminate calls) to the total amount of time in the calendar month. Availability is expressed as a decimal between 0 and 1 and is normally calculated for one calendar month of service.

Availability (Service) = Av(S)

s measured end-to-end for each service and calculated as a percentage of the total reporting interval time that a service is operationally available to the customer. Availability is computed by the standard formula:

Available Bit Rate (ABR)

A class of ATM service, normally used for applications that do not require real-time delivery of data, e.g., local area network (LAN) interconnection, distributed file services, and Frame Relay to ATM Service Interworking (FRASI).

Backup and Restore (BBKUP&R)

The combination of manual and machine procedures that can restore lost data in the event of hardware or software failure. Routine backup of databases and logs of computer activity are part of a backup & recovery program.


Return to Top

The difference, in hertz (Hz), between the highest and lowest frequencies of a transmission channel. Also used to identify the maximum amount of data that can be sent through a given transmission channel per second.

Basic Service

A set of technical capabilities that are defined in Section C. They are inherent within the base prices and may not be unbundled from these base prices.

Billable Agency Hierarchy Code

This represents an Agency Hierarchy Code (see also Agency Hierarchy Code) that is designated by an Agency to be assigned by the contractor to charges for a specific service or services under the contract. The corresponding charges should be billed to the Agency using this Agency Hierarchy Code.

Billing Codes

These are specific alpha and/or numeric identifiers that are used in the contractors commercial billing systems to represent various billing elements (e.g., feature charge type, transmission type, etc.).

Billing Dispute

A government notification to the contractor noting a difference between an actual invoiced amount and the correct amount, based on the contract.

Billing Inquiry

A question or issue in the area of billing which may lead to a billing dispute.


The smallest unit of data transmission, representing either a binary 1 or a 0.

Bulk Order

A single order submitted by authorized persons, directing a contractor to provide multiple instances of the same service from a single ordering Agency.

Business Day

Any Monday through Friday that is not a US Federal holiday.

Calendar Month

The period beginning at 12:00 midnight on the first day of a month and ending at 11:59 PM on the last day of that month. Normally the Networx billing month is a calendar month.

Call Detail Records (CDR)

Return to Top

Network record (voice, data, or other) that includes call or event details, such as type, time, duration, originator, and destination; CDR can be used for network monitoring, traffic accounting, and billing.

Cancellation Order

An order submitted by authorized persons, directing a contractor to cancel a pending order.

Centralized Billed Invoice

This represents summarized invoice data for multiple Agencies or sub-Agencies that has been combined into a single invoice and delivered to GSA. It may not be an actual request for payment.

Centralized Billing

The process by which the contractor combines the invoice data for multiple Agencies or sub-Agencies into a single invoice delivered to GSA. Agencies are invoiced directly by GSA and pay the invoice directly to GSA. GSA is responsible for the collection of charges directly from the centralized-billed Agencies or sub-Agencies. The contractor invoiced consolidated billing charges directly to GSA. See Direct Billing.

Centralized Payment

This represents payment made to the contractor by the GSA Office of Finance for the amount of the invoice less the GSA Management Service (GMS) fee, non-compliance amounts, and any amounts withheld by GSA.

Change Order

An order submitted by authorized persons, directing a contractor to make a change to a previously completed order and existing service.

Channel Service Unit/Data Service Unit (CSU/DSU)

Devices that combine the functionality of data service units (DSU) and channel service units (CSU) to adapt data from user communication systems to communication lines with multiple channels. The DSU portion as an interface between a customers data terminal equipment and a data communication network. DSU are the digital equivalent of the analog modem and are translation codecs (COde and DECode) coupled with a network termination interface (NTI). The CSU portion is used to coordinate communication from one or more data terminal equipment (DTE) devices to logical channels on a multi-channel communication circuit.


The complete transmission path between two terminals over which one-way or two-way communication may be provided. A circuit may provide one or more channels.

Class A Expedited Implementation

Expedited service implementation when the ordering Agency requires priority provisioning for NS/EP circumstances or other circumstances in which the Telecommunications Service Priority (TSP) system is invoked.

Class B Expedited Implementation

Expedited service implementation when the ordering Agency requires priority provisioning due to potential hardship to the Agency, however, not due to circumstances covered by TSP.

Class of Service (COS)

Return to Top

A grade of service that is defined by specific service KPIs. For example, for Asynchronous Transfer Mode Service (ATMS), the class of service is defined by the constancy of the cell delivery rate and the amount of bandwidth available for use. ATMS classes of service include Constant Bit Rate and Variable Bit Rate.

Commercially Available

As applied to a telecommunications service in a geographic area, the service or service related feature that is currently legally provided by a service provider to one or more other entities, independent from the service provider, for their own legal commercial business purposes.

Committed Information Rate (CIR)

Committed information rate (CIR) is a guaranteed minimum data transmission rate of service that will be available to the user through a network. Applications that use CIR services include voice and real time data applications. CIR can be measured in bits per second, burst size, and burst interval. Some service providers allow users to transmit data above the CIR level. However, when data is transmitted above the CIR level, some of the data may be selectively discarded if the network becomes congested.

Common Language Location Identification Code (CLLI)

An eleven character location identification code that complies with American National Standard Institute (ANSI) standard Ti .20 ii987. The eleven character mnemonic code is used to uniquely identify a location in the United States, Canada or other countries. These codes are known as CLLI or “Location Codes” and may be used in either a manual or mechanized record keeping system.

Competitive Local Exchange Carrier

A telephone service company that provides local telephone service that competes with the incumbent local exchange carrier (ILEC).

Complex Price Quote

Involves complex service solutions requiring coordinated effort between the Government and the contractor to develop technical, scheduling, and costing alternatives. The contractor provides the Government a service price quote describing the technical details, price, and proposed schedule information regarding implementation of the proposed service solution.

Constant Bit Rate (CBR)

A class of ATM service that supports the transport and delivery of services that require a constant, unvarying rate of information delivery, e.g., high quality video, high quality voice, and emulated circuit switching. The cell rate is constant with time.

Contract Line Item Number (CLIN)

A unique number used to identify billable items; a term used to describe an item that can have a single unit price; a contract line item must be identified separately from any other items or services on the contract.

Contracting Officer (CO)

In FAR definition, means a person with the authority to enter into, administer, and/or terminate contracts and make related determinations and findings. The Contracting Officer signs contracts on behalf of the Government and bears the legal responsibility for each contract. They alone can enter into, terminate, or change a contractual commitment on behalf of the Government.

Contracting Officer’s Technical Representative (COTR)

In Networx, the COR replaces the title for a COTR. See also Contracting Officer’s Representative (COR)

Contractor Billing Period

Return to Top

This represents the time frame during which the contractors billing system completes its processing cycle (e.g., billing records may be captured by a contractors billing system for a period running from the 1st to the 31st of a calendar month. However, the contractor billing period represents the applicable date that has been established as a monthly recurring billing platlorm cycle end date).

Contractor’s Program Organization

An organization which will be established by the contractor to be the direct interlace with the Networx PMO.


The 48 contiguous United States plus the District of Columbia.


An arrangement to reduce the amount owed by the customer in a future invoice by an agreed amount for failure to meet an SLA performance objective.

Creditable Outage or Impairment

A condition in which the service is not capable of supporting the customers intended application and the contractor is responsible.

Critical Service Level

A level of service defined for Government applications that specify higher levels of availability and performance than is assured by Routine Service.

Critical Users

Critical users of NS/EP telecommunications are key Government officials whose position requires special access and network treatment to assure telecommunications services during emergencies. During an emergency, critical users at Federal agencies generally interact with the management of critical industries, other Federal agencies, and state, local, and tribal Governments, on both an individual and regional basis, for developing emergency response options.

Cumulative Outage Time (Hours) = COT (HR)

The total sum of Outage Time(Hours) over the complete Reporting lnterval(Hours) time period for a specific service.

Custom Call Record (CCR)

CCR’s are ASCII coded records that contain information about each individual call answered by a network based Interactive Voice Response (IVR) platform. CCR data provides the ability to create custom reports on call statistics, CCR reports capture DTMF (or speech recognition entries) that the caller selected while using the IVR menu feature (i.e. menu option selections).


The Agency, including GSA, sub-Agency, or other Government entity that purchases a Networx service.

Customer Premises Equipment (CPE)

Return to Top

All telecommunications terminal equipment located on the customers premises, including telephone sets, private branch exchanges (PBX5), data terminals, and customer-owned coin-operated telephones.

Customer Proprietary Network Information (CPNI)

Information which is available to a telecommunications service provider by virtue of the providers basic service customer relationship. May include service description, billing information, customer address, etc. Provision of this information to the Government may be prohibited by law or regulation.

Customer Service Unit (CSU)

A device that provides an accessing arrangement at a user location to either switched or dedicated data-conditioned circuits at a specifically established data signaling rate. A CSU typically provides local loop equalization, transient protection, isolation, and central office loop-back testing capability. A CSU is commonly integrated with a DSU to form a CSU/DSU package.

Customer Support Office (CSO)

An organization which will be established by the contractor to provide direct, day-to-day customer service to the Government. Also referred to as Customer Service Center (CSC).

Customer Want Date (CWD)

This represents the data by which the Agency/Customer desires to have service installed.


The physical changing of circuits or lines at a telecommunications location after completion of service installations by a contractor.

DAR Administrator

An Agency DAR Administrator is an employee of an Agency who compiles, tracks and maintains a listing of all DARs specific to that Agency. The Agency DAR Administrator provides to the contractor a current list of DARs who are authorized to initiate service requests. (See Designated Agency Representative (DAR)).

Dark Fiber

An Optical Fiber through which no light is transmitted as no electronics or lasers are attached to any of its ends. Usually, optical fiber strands traveling in the same conduit or multiple conduits providing secure and reliable infrastructure to build single point-to- point connections or more complex network topologies.

Data Dictionary

A separate data dictionary is provided by the contractor for each required file it presents to the government. The data dictionary includes: description of required file, description of data elements and formats, and translation of codes.

Data Link Connection Identifier (DLCI)

A temporary channel identifier used in a communication system to identify a specific circuit along with its required communication parameters (such as peak data rates). The DLCI in a frame relay system is 10 bits. (It is pronounced dill-see).

Data Service Unit (DSU)

Return to Top

DSU is equipment that acts as an interface between a customers data terminal equipment and a data communication network. DSU are the digital equivalent of the analog modem and are translation codecs (COde and DECode) coupled with a network termination interface (NTI). The DSU formats the data for transmission on the data network and ensures that the data network operators required data formats are provided. A DSU is commonly integrated with a CSU to form a CSU/DSU package.

Data Terminal Equipment (DTE)

Equipment that converts user information into data signals for transmission, or reconverts the received data signals into user information.

Dedicated Hosting Services (DHS)

Dedicated Hosting Services (DHS) provide federal Agencies the alternative of outsourcing Web hosting operations. DHS are fully managed by the service provider. The various equipment and facilities comprising the Web hosting environment are operated and administered by the service provider.

Dedicated Transmission Service (DTS)

See Private Line Service

Designated Agency Representative (DAR)

A DAR is an employee of a Government Agency who has been authorized by the Agency to initiate and track the Agency’s Networx orders. Through the Agency DAR Administrator, an Agency designates and authorizes one or more individuals to perlorm DAR functions to the contractor.

Detail Billing File

This represents the billing support data portion of the charges delivered and the amounts due and payable by the government, and made available in a processible exchange medium.

Dialed Number Identification Service

A call identification service typically provided by a toll free (800 number) network. The DNIS information can be used by the PBX or automatic call delivery (ACD) system to select the menu choices, call routing, and customer service representative information display based on the incoming telephone number.

Digital Signal 0 (DS0)

Digital signal level zero. The base unit of digital transmission capacity (Digital signal level zero) for the North American digital hierarchy. It represents 1 communication channel = 1 simultaneous voice grade equivalent with a communication capacity of 64
thousand bits per second (64Kbps)

Digital Signal I (DS1)

Digital Signal level one. In the North American Digital hierarchy it is the equivalent of 24 multiplexed voice grade channels (DS-Os). 1.544 million bits per second (1.5Mbps). Also commonly referred to as a T-1.

Digital Signal 3 (D53)

Digital Signal level 3. In the North American digital hierarchy a D53 signal has a transmission rate of 44.736 Megabits per second and represents a total of 28 DS-1 circuit. Also commonly referred to as a T-3.

Digital Subscriber Line (DSL)

Return to Top

The transmission of digital information, usually on a copper wire pair. Although the transmitted information is in digital form, the transmission medium is usually an analog carrier signal (or the combination of many analog carrier signals) that is modulated by the digital information signal.

Direct Billing

Agencies are invoiced directly by the contractor and pay the invoice directly to the contractor. The contractor is responsible for the collection of charges directly from the billed Agencies or sub-Agencies. GSA will not be responsible for any charges directly invoiced to any Agency or sub-Agency. (See Centralized Billing)

Direct Inward Dialing (DID)

Direct Inward Dialing (DID) connections are trunk-side (network side) end office connections. The network signaling on these 2-wire circuits is primarily limited to 1-way, incoming service. DID connections employ different supervision and address pulsing signals than dial lines. Typically, DID connections use a form of loop supervision called reverse battery, which is common for 1-way, trunk- side connections. Until recently, most DID trunks were equipped with either Dial Pulse (DP) or Dual Tone Multifrequency (DTMF) addresses pulsing.

Direct-Billed Agency

A government Agency or sub-Agency that has elected to receive its billing directly from the contractor. Additionally, this represents a government Agency or sub-Agency that pays the contractor directly for services provided by the contractor.

Direct-Billed Invoice

This represents a summarized request for payment consisting of total charges delivered and the amounts due and payable by an Agency/sub-Agency that has selected direct-billing.

Discovery Meeting

A meeting between the contractor and Agency to gather requirements for an Agency-specific application, to discuss scope of work, proposed solution, roles and responsibilities, project plan and schedule, deliverables, cost estimate, and project risk assessment.

Dispute Receipt Acknowledgement

A notice sent by the contractor to acknowledge receipt of a dispute.


Within the United States, Puerto Rico, the U.S. Virgin Islands, Guam, the Northern Marianas, and American Samoa.


Anything that is instrumental in accomplishing some end needed for an undertaking or to perform a service (e.g., hardware, software, firmware)

Ethernet Private LAN (E-LAN)

A multi-point to multi-point service where disparate LAN segments are connected to form a single virtual LAN. Appropriate
applications are inter and intra-city LAN connectivity, router interconnect and server consolidation. E-LAN can be offered over either a Metropolitan Area Network (MAN) or a Wide Area Network (WAN).

Ethernet Private Line (E-LINE)

A point-to-point service where bandwidth is reserved. E-LINE ES is useful for mission critical traffic. E-LINE resembles traditional Time Division Multiplexing (TDM) private line service. Appropriate applications are router interconnect, business continuity, and disaster recovery.

Expedited Order

Return to Top

An order the Agency specifically designates to meet reduced contractual service implementation intervals.

Expedited Service Class A

The ordering Agency requires priority provisioning for National Security / Emergency Preparedness (NS/EP) circumstances, or under circumstances in which the National Communications System (NCS) invokes the Telecommunications Service Priority (TSP) system. See also Class A Expedited Implementation

Expedited Service Class B

The ordering Agency requires priority provisioning due to potential hardship to the Agency, however not due to urgent, compelling, emergency, NS/EP, or TSP circumstances. See also Class B Expedited Implementation


An additional capability beyond basic service that is to be selected at the option of the user. Features are normally separately priced, although some features have been defined to be not separately priced.

Federal Acquisition Regulation (FAR)

The primary regulation for use by all Federal Executive Agencies in their acquisition of supplies and services with appropriated funds. It became effective April 1, 1984 and is issued within applicable laws under the joint authorities of the Administrator of General Services, the Secretary of Defense, and the Administrator for the National Aeronautics and Space Administration, under the broad policy guidelines of the Administrator, Office of Federal Procurement Policy, Office of Management and Budget.

Federal Agency

In FAR definition, means any executive Agency or any independent establishment in the legislative or judicial branch of the Government (except the Senate, the House of Representatives, the Architect of the Capitol, and any activities under the Architects direction).

Federal Communications Commission

Federal Agency established by the Communication Act of 1934 that oversees commercial spectrum usage, interstate telecommunications, and all international services originating and terminating in the United States.

Federal Technology Service (FTS)

The Government organization responsible for planning, developing, establishing and managing the FTS program to meet Federal requirements for common-user local and long-distance telecommunications services government-wide (Federal Telecommunications Service prior to October 1997).

Federal Telecommunications Recommendations (FTR)

A set of telecommunications recommendations for the design and procurement of telecommunications equipment/services for the National Communications System (NCS). The FTR are issued by the NCS technology and program division, after approval by the FTR standards committee and deputy manager, NCS, pursuant to Executive Order 12472, Public Law 104-113 and NCS directive 4-1. {Source: NCS web page}

File Transfer Protocol (FTP)

A Transmission Control Protocol/Internet Protocol (TCP/IP) service that supports bidirectional transfer of binary and ASCII files without loss of data between local and remote computers on the Internet. The FTP command set allows a user to log onto a remote server over the network, list file directories and copy files.


Return to Top

A system that manages a boundary between two networks to control access between the networks. A firewall as a single point of entry to an organization’s intranet from the Internet provides a method for the security official to limit public access to data on an organization’s intranet while allowing users on the intranet to access the WWW.

Firm Order Commitment Date

The date that the contractor commits to provide the service in a state ready for the customer to use and the date that the Government expects to accept the service and billing to become effective. It is the date specified on the Firm Order Commitment Notice in accordance with Section C.3.5 (Ordering). The Firm order commitment date may not be adjusted for any reason. The contractor may record delays in service delivery due to the customer delaying the customer want date or the customer not being ready to accept the service on the firm order commitment date, but the contractor shall not change the firm order commitment date from what was delivered on the Firm Order Commitment Notice.

Fixed Allocation

A method of allocating charges among Agencies in a shared tenant arrangement where the ANI is not known for the Agencies. See Shared Tenant.

Fixed Bandwidth (FB)

The standard bandwidth amount listed for a given circuit (i.e., a Ti circuit, which has a standard bandwidth of i .54 Mbps, would have i .54 Mbps of “fixed bandwidth”). FB is different from BOD (bandwidth on demand) where bandwidth can vary from the standard amount of a given circuit.

Fractional T-Carrier DSI (FT-I)

A digital transmission service that provides a customer with multiple 64 kbps channels but less than the full 24 channels offered by a T-i channel.

Fractional T-Carrier D53 (FT3)

Fractional T3 supports n times DSis over a T3 carrier, where n is less than 28.

Frame Relay Assembler/Dissembler

A communications access device that converts data from a users network into the format that is required by a frame relay network.

Frame Relay Service (FRS)

A metropolitan and wide area networking solution that implements data link switching techniques.

Fraudulent Use of Services

Any use of Networx services for any functions or activities not authorized by the Government.


A mode of operation in which simultaneous communication in both directions may occur between two terminals. Contrast with half duplex or simplex operation in which communications occur in only one direction at a time.

Gigabit Ethernet (GigE)

Return to Top

Gigabit Ethernet (GE) is a data communication system that combines Ethernet technology with fiber optic cable transmission to provide data communication transmission at a Gigabit rate.

Gigahertz (GHz)

A measure of frequency equal to one billion cycles per second. Signals operating above 1 GHz are commonly known as microwaves.


Of, relating to, or involving the entire world; worldwide.

Global Account Manager (GAM)

The FTS manager assigned to an Agency account that provides customer support required for implementation and maintenance of Networx services. Also, called Customer Service Representative.

GMS Fee Structure

The structure for calculating the GMS fee presented by GSA to the contractor (e.g., The GMS fee structure may be a fixed percentage of the billed eligible revenue).

Government Furnished Equipment (GFE)

Property in the possession of, or directly acquired by the government and subsequently made available to the contractor. See Government Furnished Property (GFP)

Grade of Service (GOS)

A term associated with telecommunications service indicating the probability of a call being blocked during a call attempt during the busy hour, expressed as a decimal fraction.

GSA Management Service

Direct or indirect services, primarily in contract administration, performed by GSA to support the management of FTS contracts.

GSA Management Service (GMS) Fees

Charges levied by GSA to each Agency or sub Agency for their utilization of Networx services.


That mode of operation in which communication between two terminals occurs in either direction but in only one direction at a time. Contrast with duplex or simplex operation. Note: Half duplex operation may occur on half duplex circuits or on duplex circuits, but it may not occur on simplex circuits.

Hypertext Markup Language (HTML)

Return to Top

Authoring software language used on the Internet and for creating WWW pages. HTML is essentially text with embedded HTML commands identified by angle brackets and known as HTML tags.

Hypertext Transfer Protocol (HTTP)

The communications protocol used by a Web Browser to connect to Web servers on the Internet.

Hypertext Transfer Protocol Secure

The protocol for accessing a secure Web server. The use of HTTPS in the Uniform Resource Locator (URL) directs the message to a secure port address instead of the default Web port address of 80.

Identification (User ID)

The process that enables recognition of an entity by a system, generally by the use of unique machine-readable user names.


A switched connection made from a non-domestic location to a domestic location.

Individual Case Basis (ICB)

Applies to a situation with special end-user requirements, for which special arrangements are made with the contractor where fixed pricing could not have been determined or could not apply.

Integrated Services Digital Network

A service that provides end-to-end digital connectivity to support a wide range of services, including voice and non-voice services, to which users have access by a limited set of standard multi-purpose user network interlaces, as defined in the ITU-TSS I series. (See basic rate interlace and primary rate interlace.)

Interactive Voice Response (IVR)

IVR is a process of automatically interacting with a caller through providing audio prompts to request information and store responses from the caller. The responses can be in the form of touch-tone(tm) key presses or voice responses. Voice responses are converted to digital information by voice recognition signal processing. IVR systems are commonly used for automatic call distribution or service activation or changes.

Inter-exchange Carrier (IXC)

Also known as long distance carriers, inter-exchange carriers (IXC5) interconnect local systems with each other. For inter-exchange connection, networks as a rule connect to long distance networks through a separate toll center (tandem switch). In the United States, this toll center is called a point of presence (POP) connection.


The process of interconnecting a number of individual networks to provide a path from a terminal or a host on one network to a terminal or a host on another network. The networks involved may be of the same type, or they may be of different types. However, each network is distinct, with its own addresses, internal protocols, access methods, and administration.


Return to Top

The ability of systems to provide services to and accept services from other systems and to cause services from different systems to operate effectively together so as to achieve the throughput and service quality (i.e., required grade-of-service, transmission quality, and feature capability) that is agreed to be acceptable. The condition achieved among telecommunication systems when information or services can be exchanged directly and satisfactorily between them and/or their users. Interlace devices or gateways may be placed between equipments or systems in order to achieve interoperability.


A request for payment consisting of (1) total charges for services delivered and the amounts due and payable, and (2) billing support data.

Invoice Billing Data File Out-of-Balance Report

An email notification provided by the GSA to the contractor intended to alert the contractor of an out-of-balance situation between the contractors invoice files and detail billing files.

Invoice Change Notice

A report provided by the contractor to the Government indicating changes to the invoice content or format.

Invoice file

This represents summarized invoice data that is delivered by the contractor to the Government in a processible format (e.g., Electronic file, such as a spreadsheet, ASCII file; or a file made available through the internet).


The process of preparing and forwarding a list of charges to the Government for services rendered by the contractor.

IP-Security (IPsec)

A group of IP security measures which together comprise a highly secure tunneling protocol for IP communications. “Frame” — A packet, or coherent logical unit of data. FRS frames can vary greatly in length, thus facilitating the “protocol independent” nature of FRS.


Jitter, also known as cell delay variation or packet delay variation, is a measure of the variance of cell transfer delay. High variation implies the need for larger buffering for delay-sensitive traffic such as voice and video. Jitter is caused by several factors that combine to cause packet delay variation, including variations in the propagation delay, queuing delays at various intermediate switches, and service times at switching points.

Key Performance Indicator (KPI)

A measurable service attribute that is critical to the proper functioning and delivery of a telecommunications service. Each Networx service is associated with KPIs that are specified in Section C.2 (Technical Requirements).

Kilohertz (kHz)

A unit of measure of frequency equal to one thousand hertz.

Land Mobile Radio (LMR)

Return to Top

Traditionally, these are private systems that allow communication between a base and several mobile radios. LMR systems can share a single frequency or use dual frequencies. LMR in the United Statesis regulated by the FCC in part 90, Private Land Mobile Radio Services, includes various types of private radio services including police, taxi, fire and other types of two-way and dispatch services.


Also known as cell latency, cell transfer delay, or packet transfer delay, it is the round-trip delay between transmission and receipt of a packet measured between network access points. Normally latency is expressed in milliseconds and the rate of delay is sampled over a brief period, typically one minute or less, to arrive at an average latency figure. Latency includes propagation delays, queuing delays at various intermediate components such as routers and switches, and service times at switching and routing points.

Layer 3

The network layer in the Open Standards Interconnection Model (OSI). Layer 3 protocols handle routing within and between networks.

Local Area Network (LAN)

A data communications system that (a) lies within a limited spatial area, (b) has a specific user group, (c) has a specific topology, and (d) is not a public switched telecommunications network, but may be connected to one.

Local Exchange Routing Guide (LERG)

A Telcordia publication that relates Numbering Plan Area (NPA)/NXX to the Vertical and Horizontal (V&H) and CLLI Code of the associated wire center.

Local Government Contact (LGC)

An individual designated by a DAR on a service request to interlace with the contractor at a specific Agency location on his behalf. LGC participates in service transition planning and implementation activities for a location, however, the decision to change or modify an order placed by the DAR, remains with the DAR unless otherwise specified in writing by the DAR on the service request of record.

Local Number Portability (LNP)

LNP is the process that allows a subscriber to keep their telephone number when they change service provider in their same geographic area. Local number portability requires that carriers release their control of one of their assigned telephone numbers so customers can transfer to a competitive provider without having to change their telephone number. LNP also involves providing access to databases of telephone numbers to competing companies that allow them to determine the destination of telephone calls delivered to a local service area.

Local Technical Contact

An individual who has been identified by an Agency to interface with the contractors technical staff at a specific location.

Loop Start

A supervisory signal given by a telephone or other telecommunications device after the loop path to the central office or other switching system is completed.


The amount of electrical attenuation in a circuit, or the power consumed in a circuit component.


Return to Top

These are services, features, or equipment which the offeror must propose. Any mandatory service, feature or equipment proposed must be priced.

Mandatory Feature

A feature to be provided by the contractor at least in limited areas and extended to other geographic areas at the same time that the contractor makes them commercially available in those areas.

Mean Time Between Failures (MTBF)

A measurement of performance for storage systems availability.

Mean Time to Repair (MTTR)

The average time required to return a failed service or equipment to full operational status.

Mean Time to Restore (MTTR)

See Mean Time to Repair.

Meet-Me Conference

Allows stations to be connected in a conference by dialing one access code at a particular time.

Mobile Satellite Service (MSS)

A form of wireless service that employs satellites as part of the wireless infrastructure and is capable of serving very large geographic areas. The use of MSS may be appropriate for areas that are economically not viable for land based radio towers or to provide wide area group call (dispatch type) services.

Monthly Recurring Charge (MRC)

A fixed charge paid monthly

Multimode/Wireless LAN Service (MWLANS)

A wireless transmission service for mobile terminals. MWLANS provides Agency users with wireless access points, i.e., Wi-Fi hotspots with connections to the Internet and/or to the contractors IP network. These wireless access points are at locations such as hotels, airports, convention/conference centers, or other public establishments. MWLANS supports IP packet-mode transmission.

Multiprotocol Label Switching (MPLS)

A network routing protocol that is based on switching through the use of tag labels. The MPLS standard is being developed by the

Network Entry Point

Return to Top

A system that receives ANSI X12 Electronic Data Interchange transactions and transfers them to Value Added Networks. A Network Entry Point can provide services such as archival, date and time stamp, file transfer, and access to other networks such as the Internet.

Network Fault

A total failure or partial performance degradation of any network element such that it causes a loss or degradation of Networx service quality or performance.

Networx Hosting Center (NHC)

A secure web site containing software and data to be used by offerors to enter Networx prices and compute costs.

Networx Inventory Code

A code used for billing, ordering, inventory and service management. Identified by eleven alphanumeric characters. The first eight characters are the Network Site Code, and the last three represent the contract and the service ordered by the agency at the Network Site Code.

Networx Services

Services provided by the contractor to the Government under the Networx contract acquisition(s).


Center for the interconnection of two or more branches of a telecommunications network.


The worldwide countries and locations other than those defined herein as domestic.


Those service, features, or equipment which offerors may propose but are not required to propose. Any service feature or equipment proposed must be priced. Also referred as optional service.

Non-Mandatory Feature

A feature that is not mandatory but may be offered at the option of the offeror.

Non-recurring Charge (NRC)

A cost for a facility, service, or product that only occurs one time or is not periodically charged.

Numbering Plan Area (NPA)

Return to Top

The first three digits of a North American telephone number, often called an area code, in which the first digit cannot be a 1 or a 0 and that the remaining numbers can be 2 through 9.


U.S. territories and possessions outside of the contiguous 48 states. It includes Alaska, Hawaii, Guam, Puerto Rico, US Virgin Islands, American Samoa, and the Northern Marianas Islands.

Off-Net Call

A call between two or more stations, at least one of which is a presubscribed user or service delivery point (usually a PBX or Centrex) and at least one of which is not.

Off-Net Location

For a specific service (such as Voice Service), a location that is not presubscribed to the service if provided by the Networx contractor, i.e., a location “off’ of the network that is used to provide the contractors Networx service. Certain Networx services can transmit and receive communications with locations not “on” the contractors Networx network, such as commercial telephone lines on the PSTN and personal computers connected to the Internet.

On-Net Call

A call between two or more on-net locations.

Operational Support System (055)

A system that is used to allow a network operator to perform the administrative portions of the business. These functions include billing, service ordering, customer support, service management, inventory management, and program management. For purposes of this contract, the definition includes all systems required to support the communications company including billing, service ordering, customer support, service management, inventory management, and program management.

Optical Add-Drop Multiplexer (OADM)

An optical amplifier-like network element that allows the extraction/insertion of one or more wavelengths from/to the multi- wavelength signal as it is passed through the amplifier.

Optical Carrier Hierarchy Level-N (OC-n)

Optical carrier (OC-n) transmission is a hierarchy of optical communication channels and lines that range from 51 Mbps to tens of Gbps (and continues to increase). The n is an integer (typically 1, 3, 12, 48, 192, or 768) representing the data rate.

Optical Wavelength Service (OWS)

Provides connectivity to data centers, carrier hotels, and enterprise businesses and tremendous bandwidth capacity of a dedicated wavelength connection, without the significant upfront capital costs or the management and maintenance issues associated with a dark fiber network.


See Non-Mandatory

Order Receipt Acknowledgement

Return to Top

The acknowledgement provided by a service provider (contractor) that an order has been received from the ordering Agency.

Order Tracking Number

The identification assigned by the contractor for a corrected order.


A telecommunication service condition wherein a user is deprived of service due to a malfunction of the contractors communication system.

Outage Time

The duration of a service outage. Outage time starts when the contractor creates a trouble report, whether from a customer report of trouble or contractor-detected fault, and ends when the service is restored.


A switched connection made from a domestic location to a non-domestic location.

Packet Switched Network

A network designed to carry data in the form of packets. The packet format, internal to the network, may require conversion at a gateway.


A word, character, or combination of characters that permits access to otherwise inaccessible data, information, or facilities. Also referred to in this document as an authorization code.

Permanent Virtual Circuit (PVC)

A PVC is a virtual data circuit created for a continuous communication connection. After a permanent communications circuit is established, a data path (logical connection) is maintained until the PVC is disconnected. Multiple PVCs may be constructed from a single customer data port.

Point of Presence (POP)

A contractor-owned or controlled physical location (1) at which contractor-owned or controlled network facilities used to provide Networx services are located and (2) at which access to and/or from on-net user Agency locations is connected to network services.

Price Reduction

The lowering by a contractor of specific prices below current contract prices. Price reductions may be implemented under the PMM clause or Price Re-determination clause of this contract. Price reductions may also be implemented by the contractor according to Section H.8 (Price Reductions).

Primary Inter-exchange Carrier (PlC)

Return to Top

Refers to the company that is selected by the subscriber to be its main long distance company. It is the carrier chosen by a subscriber to be accessible via simplified dialing pattern.

Private Branch Exchange (PBX)

Telephone switching equipment conforming to the EIA standards RS-464 and RS-464-1, published in December 1977 and August 1982, and meeting Federal Communications Commission (FCC) registration requirements for interconnection to the public switched network.

Private Line Service (PLS)

The service category covering provision of private-line transmission of voice or data using end-to-end transmission media. See Dedicated Transmission Service.

Program Management Office (PMO)

An office within the GSNFTS organization responsible for management and contract administration of a telecommunications program. Within the context of this document, it refers to the specific PMO responsible for the Networx program.

PSTN location

A location where PSTN circuit switched voice service is available to general customers in the country/jurisdiction in question. PSTN locations include wireless handsets and terminals as well as traditional wireline telecommunications customer addresses.

Public Switched Network (PSN)

Any common carrier network that provides circuit switching among public users, including foreign Postal Telephone and Telegraphs. Note: The term is usually applied to the public switched telephone network, but it could be applied more generally to other switched networks that are available to the public, e.g., packet-switched public data networks.

Public Switched Telephone Network

Common domestic telecommunications network that is accessed by private branch exchange trunks, telephones, Centrex systems, and wireless terminals and handsets.

PVC Availability

PVC availability is defined as the ratio of the time during the month that a PVC connection is available to the user to carry traffic to the total amount of time in the calendar month. It is expressed as a fraction between 0 and 1 and is calculated for one calendar month of service.

Quality of Service (QoS)

A defined set of measurable engineering values for a service that is guaranteed by the contractor and that will support different classes of service. For example, Asynchronous Transfer Mode (ATM) Constant Bit Rate (CBR) service class QoS is equivalent to a digital private line. Variable Bit Rate Real Time (VBRrt) service class QoS can support applications such as videoconferencing. Available Bit Rate (ABR) service class QoS can support applications such as e-mail and file transfer.


To make a document correct for publication. In this contract, redactions are an Offeros proposed deletions from its contract of sensitive or corporate proprietary information. The burden of proof is on the Offeror to show that its proposed redactions are protected from public disclosure by law or regulation or that otherwise, the disclosure is not necessary and/or would cause harm to the Offeror.


Return to Top

The term Service refers to the primary unit of Networx technical and pricing requirements. It includes all components and functions provided by the contractor to deliver a specific service, including the contractors network, contractor-provided access arrangements and service enabling devices. Specific Networx services are identified in Section C.2.1.

Service Coordinator (SC)

An individual designated by the Government on a service request to provide liaison and coordination for the services being requested. The SC is normally an Agency project or network manager responsible for the coordinated installation of multiple services, service trials, demonstrations, orders, and/or projects. An SC is appointed by the DAR of record for specific services being ordered. Unless specified in writing by the DAR of record, an SC may not change or modify an order. The SC is provided to the contractor for convenience, however, the contractor is not required to maintain a directory of SOs.

Service Delivery

A process which begins at the time an order is accepted by the contractor and ends at the time service is accepted by the customer. Service delivery includes service provisioning and service acceptance sub-processes.

Service Delivery Point (SDP)

The interface point at which a service is delivered by the contractor to the Government or its designated agent. The SDP is the
interface point for the physical or logical delivery of a service, the point at which performance parameters are measured to determine compliance with the contract, and the point used by the contractor to identify the pricing for services rendered. SDPs may be located on or off Agency premises. Possible SDP locations include but are not limited to:
a) Network side of a Private Branch Exchange (PBX), Central Office, Centrex system, or other communications system or network.
b) User side of contractor-provided access facilities (e.g., gateway router).
c) Standard carrier/user demarcation point.
d) Minimum Point of Penetration (MPOP) [FCC defined demarcation point].
e) Desktop (e.g., telephone set, personal computer [PC]).
f) Contractors POP.
g) Wireless phones and satellite earth stations.
Services may or may not have a physical SDP, depending on the characteristics of the individual services.

Service Enabling Device (S ED)

A unit of, or separately priced component within or directly associated with, contractor-provided and owned equipment used to meet the User to Network Interface (UNI) requirements for an individual service and/or to implement access aggregation and integration to provide a lower service delivery cost to the Government. A SED is also a unit of, or separately priced component, within or directly associated with, contractor-provided and owned equipment or software used to enable the requirements associated with the Management and Applications Services and Security Services. Generally located at the customers premises, a SED will be offered only as needed to provide delivery of a service which is acquired under a Networx contract.

Service Level Agreement (SLA)

An agreement between the Government and the contractor that the contractor delivers a specified service at a performance level that meets or exceeds the agreed performance objectives for the service. The SLA also specifies the measurement approach and the type and amount of credits that the Government is entitled to receive.

Service Order Completion Notice (SOCN)

The notice that contains data elements notifying the Agency that the service for a given order has been fully installed and is ready for acceptance.

Service Order Confirmation

The notice a contractor provides the Agency that contains the data elements that a service for a given order is accepted as a valid service with all the information needed to start service provisioning.

Service Outage

Either a complete loss of service or degradation of service that is so severe that it is not able to support customer use.

Service Restoration

The point in time at which the contractor returns service to a condition in which all KPIs meet or exceed their associated AQLs following the opening of a trouble ticket for either unacceptable service performance or for a service outage.

Service Trial

Return to Top

The use of proposed future enhancements by an Agency that takes place for an agreed upon period of time, at agreed upon locations.

Service Type

Describe a group of individual services that are similar and are grouped to simplify specification, offering and evaluation processes. Within each Service Type, individual services are specified. In Networx, there are six (6) Service Types as follows: 1. Telecommunications Services. These include services which are basic transport level (OSI level 1, 2, and 3) services.
2. Management and Applications Services. These include services which address the Agency’s need for management services and applications that are directly associated with, and add value to, the delivery of telecommunications services and solutions.
3. Security Services. These include services which provide additional end-to-end security solutions and management.
4. Special Services. These include services which are based on satellite and land mobile radio transmission systems.
5. Wireless Services. These include services which are based on terrestrial wireless transmission systems.
6. Access Services. These include services which can be used to connect to Agency designated networks. [Note: Not applicable in Universal. Applies to Enterprise only]

Service-Affecting Fault

An outage, limitation, or degradation of service that impedes the customers ability to use the service for its intended function or a failure of a supporting element (such as failure of the network management system or a hazard in a facility) or feature (such as a protected path) that is integral to the operation of the service.

Serving Wire Center

The physical location of the Local Exchange Carriers central office. It is identified by the first eight characters of Telcordias CLLI Code and is stored in the Local Exchange Routing Guide.

Shared Tenant

Use by multiple government Agencies of the same channel on an access circuit or other facilities to a building or complex. This occurs most frequently in conjunction with GSA owned voice switches. See Fixed Allocation, Dynamic Allocation, and Percentage Allocation value.

Shared Tenant Allocation

This represents the percent allocation of charges assigned to an Agency or Agencies in a shared-tenant arrangement.

Simple Price Quote

Involves standard services, including features, which the Government can order directly from the contract. The contractor provides the Government a quote of the current contract pricing including all recurring and non-recurring charges, expedite charges, if applicable, and service availability.


A subsidiary billing entity as defined by the parent Agency and identified by an Agency Hierarchy Code.


Document filed by a regulated telephone company with a state public utility commission or the Federal Communications Commission. The tariff is a public document that details services, equipment and pricing offered by the telephone company to all potential customers.

Telecommunications Service Priority

The TSP System (National Communications System [NCS]-3-1-2 and NCS-3-1-3) provides a framework for telecommunications services vendors to initiate, restore, or otherwise act on a priority basis to ensure effective NS/EP telecommunications services during national emergency. The TSP System applies to common carriers, to Government, and to private systems that interconnect with commercially provided services or facilities.

Telecommunications Services

Return to Top

The services and solutions that deliver or augment communications between users up to and including interstate and international communications. It refers to a communications service or solution specified as a discrete offering or set of capabilities. Also see “Service Types”

Time to Restore (TTR)

The elapsed time ot a service outage (outage time) minus any (1) time due to scheduled network contiguration change or planned maintenance or (2) time, as agreed to by the Government, that the restoration of the service cannot be worked due to Government caused delays. Examples of Government caused delays include: 1) the customer was not available for required testing orto allow the contractor to access the Service Delivery Point or other customer-controlled space or interlace at the scheduled time; 2) the customer gave the contractor an incorrect address for the SDP; 3) the customer failed to inform the contractor that a security clearance was required to access the SDP or customer-controlled space; 4) or the Government required service at a remote site and agreed that a longer transit time is required.


is the process for the coordinated transfer of service from a specified GSA FTS incumbent contract, such as FTS2001, Crossover, and FTS satellite and wireless contracts, to a Networx contract.

Unique Billing Identifier (UBI)

The purpose of a UBI is to uniquely identify a single service and all components of that service separately from all other services being provided from within that same category of Networx services. The contractor must provide a Unique Billing Identifier (UBI) to identify each billed record. The Government requires the contractor to assign a unique identifier for each component of the billed service that maps to the UBI. The contractor may use existing fields in its systems to provide the UBI. The contractor is allowed to determine the form of the UBI for each service (especially those with multiple components).


An individual or Agency that utilizes Networx services. Also see Authorized User.

User Registration

The process for a user that orders NETWORX Services to establish access to the contractor provided ordering system.

Variable Bit Rate/non-real time (VBRnrt)

A class of ATM service used mainly for time-critical transaction processing, data transfer, and frame relay-to-ATM internetworking (FRASI) in which bandwidth is made available only as needed but with somewhat less control of latency and jitter than with VBRrt.

Variable Bit Rate/real time (VBRrt)

A class of ATM service, used primarily for voice, lower quality video, and media, in which bandwidth is made available only as needed but with a enough control of latency and jitter to deliver acceptable application quality.

Vertical and Horizontal (V&H)

Vertical and Horizontal coordinates result trom a complex algorithm that projects the curvature ot the earth onto a tlat plane. I hese coordinates have been used in telephony since the late 1950’s as a means to determine airline distance between two points via a simple formula. The projection algorithm uses latitude and longitude as well as various other factors in deriving V&H values. V&Hs are used to identify locations and hence relative distances between network elements (e.g. switch locations), and between rate centers (e.g. the center of a rate exchange area). Such computations are necessary in cases where rates and costs for services are based on distance sensitive factors.

Virtual Private Network (VPN)

Secure private communication path(s) through one or more data network that is dedicated between two or more points. VPN connections allow data to safely and privately pass over public networks (such as the Internet). The data traveling between two points is encrypted for privacy.

Voice over Internet Protocol (V0IP)

Return to Top

A combination of technology and Internet protocols that allow the transmission of real-time voice communications across a data network.

Web Site

A computer on the Internet or an intranet running a Web Server that responds to HTTP and HTTPS request from Web Browsers.

Wide Area Network (WAN)

A communications network serving geographically separate areas. A WAN can be established by linking together two or more metropolitan area networks, which enables data terminals in one city to access data resources in another city or country.

Wire Center

The location of one or more local switching systems; a point at which customer loops converge.

Wire Center Serving Area

The area of an authorized telephone company’s Local Exchange Service local calling area served by a single wire center.


A categorization of switched and non-switched service types that generally use radio (e.g., mobile, cellular, or satellite radio) as their primary transmission medium. Generally excludes point-to-point terrestrial microwave.


A categorization of switched and non-switched service types that generally use metallic cable, optical fiber cable, and point-to-point terrestrial microwave radio as their primary transmission media.

Return to Top