Carrier Access 1750 user manual Glossary of Terms, ATM Adaptation Layer AAL

Glossary

	Glossary of Terms
ATM Adaptation Layer (AAL)
Type 1	AAL functions in support of constant bit rate, time-dependent 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 calling 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
	internetworking 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
	internetworking 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.

Glossary-6 Broadmore 1750 - Release 4.6