ADTRAN 1200214L1 Spezifikationen PDF herunterladen (Seite 161)

Appendix D. Glossary

61200214L1-20 IQ Probe User Manual D-3

performs multiplexing of lower speed digital channels into a higher

speed composite channel. The channel bank also detects and trans-

mits signalling information for each channel; thereby transmitting

framing information so that time slots allocated to each channel can

be identified by the receiver.

CIR

Committed information rate. Less than or equal to the access rate, the

CIR is used by the service provider for rate enforcement when the

network is congested. When rates exceed the CIR, frames may be dis-

carded.

clocking

An oscillator-generated signal that provides a timing reference for a

transmission link. A clock provides signals used in a transmission

system to control the timing of certain functions. The clock has two

functions: (1) to generate periodic signals for synchronization and (2)

to provide a time base.

control port

The electrical interface between the IQ Probe unit and a control termi-

nal. The control terminal is used to communicate commands to the

unit.

CPE

Customer premise equipment. All telecommunications terminal

equipment located on the customer premises including telephone

sets, private branch exchanges (PBXs), data terminals, and customer-

owned coin-operated telephones.

C/R bit

In the Q.921 protocols, a bit that identifies a data-link-layer frame as

either a command or a response.

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ADTRAN 1200214L1 Spezifikationen Seite 161