Nortel Networks Circuit Card - Manual (Page 904)

Page 904 of 906 Appendix A: LAPB Data Link Control protocol
553-3001-211 Standard 3.00 August 2005
Asynchronous Balanced Mode
Asynchronous Balanced Mode (ABM) is a balanced, configured operational
mode in which either combined station may send commands at any time and
may initiate certain response frame transmissions without receiving
permission from the other combined station.
Commands and responses
The elements of procedure are described in terms of actions which take place
when a command is received. The classes of procedures are a combination of
the frame structure and the set of elements that satisfy the requirements of a
specific application. The LAPB Balanced Asynchronous Class of Procedure
(BAC, 2, 8) is implemented. This is compatible with both BX.25 and ADCCP
specifications. The basic set of commands and responses is listed in
Table 281 on
page 905 .
Figure 191
Balanced configuration
Commands
Combined
station
Combined
station
Responses
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