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61202.029L2-1 ISU 128 User Manual 123
Glossary
B-Channel
64 kbps bearer channel used for voice, circuit, or packet switched data.
bearer service
As defined by CCITT standards, a type of telecommunication service that provides the
capability for the transmission of information between user-to-network interfaces.
Bearer services defined for ISDN are circuit mode and packet mode.
BONDING mode 1 Protocol
Industry standard B channel aggregation protocol. Developed by the Bandwidth on
Demand Interoperability Group.
CCITT
Consultative Committee on International Telephony and Telegraphy. A body of the
International Telegraph Union (ITU) which prepares recommendations, commonly
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 subscribers 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.
clear channel
A channel in which all the 64 kbps are used for transmission. To achieve this bit
robbing signalling must be eliminated.
D-channel
The ISDN channel that carrier signalling information to control the call setup,
teardown, or invocation of supplementary services. The D-Channel may also be used
to provide packet mode data service.