Interphase Tech iSPAN 5535 PRI - Manual (Page 154)

Glossary
134 Interphase Corporation
B channel ◆ A 56 Kbps or 64 Kbps bearer channel. Typically used for
delivering data or voice over ISDN.
Bearer Service ◆ A type of telecommunications service that provides
the capability to transmit a specific type of data such as voice or fax.
Bonding ◆ Bonding is the act of combining two 64 Kbps B-channels
to derive a 128 Kbps channel. This is done by establishing two B-chan-
nel circuit-switched calls and combining them in the customer’s equip-
ment (using Multilink PPP or the bonding specification) or by
associating multiple B-channels in the network (multi-rate services).
BPV (BiPolar Violation) ◆ A BPV error event for an AMI-coded sig-
nal is the occurrence of a pulse of the same polarity as the previous
pulse.
BRI (Basic Rate Interface) ◆ A defined ISDN interface that includes
two B channels and one D channel. Also known as 2B+D. B channels
are used for voice and data while the D channel is generally used only
for signalling within the telephone network.
call bumping ◆ The ability to receive an incoming call during a
bonded outbound call.
CCITT (International Telephone and Telegraph Consultative
Committee)
◆ See ITU (International Telecommunication Union) on
page ITU (International Telecommunication Union).
Centrex ◆ Local Public Exchange with PBX facilities.
channel aggregation ◆ Channel aggregation combines multiple phys-
ical channels into one logical channel of greater bandwidth.
CO (Central Office) ◆ The site where the local Telco switches reside
for all the telephone system’s call routing and other functions. This is
the Telco side of the local loop. If the distance between your location
and the central office switch exceeds 18,000 feet and/or the signal loss
exceeds 35.0 dB, a repeater must be installed to allow ISDN service.
configuration cycle ◆ A type of I/O cycle provided on the PCI bus to
facilitate system configuration.
CPE (Customer-Premises Equipment) ◆ All equipment that resides
beyond the telephone service demarcation point. In the USA this typi-
cally includes the NT1 and all ISDN devices. Customer equipment
may also include inside wiring, as well as telephone modems, ISDN
equipment, and so on.