Glossary-6 Broadmore 1750 - Release 4.6
Glossary
Glossary of Terms
ATM Adaptation Layer (AAL)
Type 1 AAL functions in support of consta nt bit rate, time-depend ent traffic
such as voice or video (default in CES-CBR configuration).
Type 2 AAL undefined by International Standards bodies. Its anticipated use is
for variable bit rate video transmission.
Type 3/4 AAL functions in support of variable bit rate, delay-tolerant data traffic
requiring some sequencing and/or error detection support. This was
originally two AAL types, i.e., connection-oriented data traffic requiring
minimal sequencing or error detection support.
Type 5 AAL functions in support of variable bit rate, delay-tolerant connection-
oriented data traffic requiring minimal sequencing or error detection
support.
Broadband Bearer Capability
A bearer class field that is part of the initial address message.
BCOB Broadband Connection Oriented Bearer -- information in the SETUP
message that indicates the type of service requested by the call ing user.
BCOB-A Bearer Class A -- indicated by ATM end user in SETUP message for
connection-oriented, constant bit rate service. The network may perform
internetwo rk ing based on AAL information element (default in CES-
CBR configuration).
BCOB-C Bearer Class C -- indicated by ATM end user in SETUP message for
connection-oriented, variable bit rate service. The network may perform
internetwo rk ing based on AAL information element.
BCOB-X Bearer Class X -- indicated by ATM end user in SETUP message for
ATM transport service where AAL, traffic type, and timing requirements
are transparent to the network.