Avaya G700 Installation And Upgrades page 322

Glossary:
Challenge-Handshake Authentication Protocol (CHAP)
An authentication method for connecting to an Internet Service Provider (ISP). CHAP does not require a user to use a
terminal screen to log in to the ISP. Because the user password is not sent in text format, CHAP is more secure than some
other authentication methods.
channel
(1) A circuit-switched call. (2) A communications path that is used to transmit voice and data.
(3) In wideband transmission, all the contiguous time slots or noncontiguous time slots that are necessary to support a
call. For example, an H0-channel uses six 64-kbps time slots. (4) A DS0 on a T1 facility or an E1 facility that is not
specifically associated with a logical circuit-switched call.
channel associated signaling (CAS)
A method of signaling that is used with non-ISDN digital trunks. CAS is defined only for E1 trunks, and is bit oriented.
Usually for ITU-T-defined E1 trunks, CAS signaling is carried over E1 timeslot 16, and framing is carried over TS0.
channel negotiation
The process by which the channel that is offered in the channel identification information element (CIIE) in the SETUP
message is negotiated to be another channel. This other channel is acceptable to the switch that receives the SETUP
message, and ultimately acceptable to the switch that sent the SETUP message. Negotiation is attempted only if the CIIE
is encoded as Preferred. Channel negotiation is not attempted for wideband calls.
channel service unit/data service unit (CSU/DSU)
A hardware device that converts digital data frames from the communications technology that is used on a local area
network (LAN) into frames that are appropriate for a wide area network (WAN), and vice versa. The CSU receives and
transmits signals from and to the WAN line, and provides a barrier for electrical interference from either side of the unit.
The CSU can also echo loopback signals from the central office (CO) for testing. The DSU manages line control, and
converts input and output between RS-232C, RS-449, or V.xx frames from the LAN and the time-division multiplexed
DSX frames on the T-1 line. The DSU manages timing errors and signal regeneration. The DSU uses a standard
(EIA/CCITT) interface to provide a modem-like interface between the computer as data terminal equipment (DTE) and
the CSU. The DTE interface of a DSU is usually compatible with the V.xx and RS-232C or similar serial interface. The
DSU also provides testing capabilities.
CHAP
See Challenge-Handshake Authentication Protocol
chassis
A rack-mountable container for circuit packs, media modules, and other components of a media gateway.
CI
Clock input
CIIE
Channel identification information element
circuit
(1) An arrangement of electrical elements through which electric current flows. (2) A channel or transmission path
between two or more points.
circuit emulation service (CES)
A connection over an ATM PVC-based network that provides end-to-end service. CES conforms to the CES ATM Forum
VTOA-78 Interoperability Specifications (CES-IS). Also called virtual trunking. See also
(PVC).
circuit pack
A circuit card on which electrical circuits are printed, and IC chips and electrical components are installed. A circuit pack
is installed in a switch carrier.
322
(CHAP).
Installation and Upgrades for G700 with S8300 or S8700
555-234-100 — Issue 3 — May 2003
permanent virtual circuit