Appendix D. Glossary

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.

CPE

Customer premises equipment. All telecommunications terminal equipment located on the customer premises, including telephone sets, private branch exchanges (PBXs), data terminals, and customer-owned,coin-operated tele- phones.

craft port

The electrical interface between the MX2800 STS-1 and the control terminal. The control terminal is used to communicate commands to the unit.

CSU

Channel service unit. A device used to connect a digital phone line coming in from the phone company to either a multiplexer, channel bank, or directly to another device producing a digital signal; for example, a digital PBX, a PC, or data communications device. A CSU performs certain line-conditioning and equalization functions, and responds to loopback commands sent from the cen- tral office. A CSU also regenerates digital signals. It monitors them for problems and provides a way of testing the digital circuit.

CTS

Clear to send. A signal on the DTE interface indicating that the DCE is clear to send data.

data communications equipment See DCE.

data service unit See DSU.

dB

Decibel. A unit of measure of signal strength; usually the relation between a transmitted signal and a standard signal source.

D-4

MX2800 STS-1 User Manual

61200659L1-1

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ADTRAN 1200291L1, 4200659L1, 4175043L2, 4200659L5, 4200659L8, 4200659L2, 4200659L7, 4200659L3, 4200659L6, 4200659L4, 1200657L2 Cpe
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