Black Box IS425A, Manual, Page: 103 / 107

IS425A - ISDN Terminal Adapter with S/T-Interface
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Appendix E: Glossary
ACO Additional Call Offering . A feature in ISDN that allows calls to be
received during congestion on one or both B-Channels like call waiting.
Implied in CACH/EKTS provisioning.
BRI Basic Rate Interface . An ISDN line composed of (2B+D) two
64Kbps B-Channels and one 16Kbps D-Channel. The B-Channel may be
used for both voice and data signals. The D-Channel is used for signaling
and X.25 packet access. All channels are full duplex.
B-Channel Bearer Channel. ISDN bearer service channel operating at
56 or 64Kbps, carrying user voice or data, circuit switched, packet, or
frame-mode services may be obtained on this channel.
CACH/EKTS Call Appearances Call Handling/Electronic Key
Telephone System. A protocol system provisioned in the CO that allows
easier usage of ISDN Telephones and equipment, but may be unavailable
or more expensive.
CO Central Office. A location for the local telephone switch. The switch
connects and routes the end user’s calls to the ISDN network.
CPE Customer Premises Equipment . According to the FCC, any
communications equipment placed at the customer’s site, including
modems, telephone sets, PBXs, and NT1s.
Custom A switch setting in the local Telephone Company’s Central Office.
D-Channel Data Channel. The ISDN out-of-band signaling channel,
carrying ISDN user-network messages. It can be used to carry packet or
frame-mode user data. The D-Channel operates at 16Kbps in a BRI.
Full Duplex. The transmitting of information in both directions at once.
ISDN Integrated Service Digital Network . A digital network that
provides a wide variety of communication services. A standard set of
user-network messages, and integrated access to the network.