Nortel Passport 4400 Series Introduction Manual page 129

Glossary
CCS (Common Channel Signaling)
Channel Loopback
CIR (Committed Information Rate)
CLI (Command Line Interface)
Clocking, Data Port
Clocking, System
Committed Burst (Bc)
CO (Central Office)
A means of passing signaling information for multiple bearer channels
over a single data link, using one of the DS0 time slots. In E1, time slot
16 carries the signaling information. In T1 time slot 24 is usually
dedicated to signaling, but any one of the time slots may be configured
for a that purpose. Signaling information for individual channels is
passed by HDLC protocol. Examples include Q.SIG, Q921/931, DPNSS
and SS#7.
A diagnostic tool for testing the integrity of a DS0 channel.
The rate in bits per second at which the network agrees to transfer
information over a permanent virtual circuit (PVC) in Frame Relay. CIR
is related to committed burst (Bc) and measurement interval (Tc) as
CIR=Bc/Tc.
An terminal based utility that allows the operator to enter instructions
from the keyboard and then execute those instructions.
Source for clocking either of the two data ports. Can be either a system
clock or a tail circuit.
Source for clocking the T1 voice module. Can be either DSX-1 interface,
DS-1 interface, or internal.
The maximum amount of data (in bits) that a network agrees to transfer
under normal conditions over a measurement interval. The data may be
in the form of one frame or many frames.
A telephone company facility which houses switching equipment for
connecting subscriber lines to each other, both locally and over long
distances.
Passport 4400 Introduction and Road Map
Glossary-3