Glossary
CCITT
Consultative Committee on International Telephony and Telegraphy. A body of the International Telegraph Union (ITU) which prepares recommendations, com- monly referred to as international standards, to resolve technical telegraph and telephone problems.
central office (CO)
In telephony, the phone company switching facility or center, usually a Class 5 end office, at which subscriber's local loops terminate. Handles a specific geographic area, identified by the first three digits of the local telephone number. Usually the facilities of the local BOC.
channel bank
Equipment in a telephone central office that performs multiplexing of lower speed digital channels into a higher speed composite channel. The channel bank also de- tects and transmits signaling information for each channel, transmitting framing information so that time slots allocated to each channel can be identified by the re- ceiver.
clear channel
A channel in which all the 64 kbps are used for transmission. To achieve this bit robbing signaling must be eliminated.
CPE
Customer premises equipment. A generic term for communications terminal gear owned by the customer, residing on customer premises.
CSU
Channel service unit. A component of CPE used to terminate a digital circuit, such as DDS or T1 at the customer site. Performs certain
The ISDN channel that carries signaling information to control the call setup, tear- down, or invocation of supplementary services. The
DCE
Data communications equipment. The portion of a data terminal that provides the interface to the network.
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