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Access Navigator - Release 1.8 August 2003 GlossaryGlossary-9
Glossary
GR-303 A Telcordia® (formerly Bellcore) generic requirement describing a digital loop
carrier system that operates on T1 circuits between an Integrated Digital Terminal
(switch) and a Remote Digital Terminal. The IDT controls the RDT through an
Embedded Operations Channel (EOC) for messaging and an embedded Timeslot
Management Channel (TMC) for setting up crossconnects. GR-303 systems can
provide call concentration from 1:1 to 44:1 and are expandable from 2 to 28 T1
circuits that can carry up to 668 channels simultaneously.
Grooming Consolidating or segregating traffic for efficiency.
Interface A general term that refers to a system connection, port or boundary. Interfaces are
described by their physical, electrical, and data properties. Access Navigator
interfaces include the Alarm Output connector, DSX-1 interface, and Ethernet
port.
Internet
Protocol
IP. A network layer protocol. The dominant layer protocol used in TCP/IP
applications.
Internet
Protocol
Address
A 32-bit network address that uniquely locates a host in an internetwork. Most IP
addresses today still use IP version 4 (IPv4) format containing four numbers
separated by three periods. The general format is xxx.xxx.xxx.xxx where each xxx
is a decimal number between 0 and 255.
Integrated
Services Digital
Network Basic
Rate Interface
ISDN BRI provides 144,000 bits per second and is designed for desktop service.
ISDN BRI is also referred to as 2B+D because it provides two Bearer channels
(B1 and B2) at 64 kilobits per second, plus one D channel for signaling at 16
kilobits per second. The ISDN BRI card complies with the Universal Digital Loop
Carrier (UDLC) model described in Telcordia® (Bellcore) specification TR-397.
Line Build Out LBO. A DS1 (T1) transmit output property that ensures the signal received at the
other end of the line has the required amplitude and shape to minimize errors. This
property is specified either by its DSX-1 Equalization or CSU Attenuation.
Line
Termination
Identifier
TermID. An identifier used in GR-303 systems to number the switch DS1s. These
IDs are independent of the hardware DS1 numbers. Any switch DS1 can be Line
Terminal ID #1
Line Unit Line
Termination
LULT. A line unit (card) for terminating a subscriber-side ISDN BRI port.
Line Unit
Network
Termination
LUNT. A line unit (card) terminating a network-side ISDN BRI port.
Line Traditionally, an electrical path (two wires) between the central office and a
subscriber phone. More generally, any connection between two points in a carrier
network.