Nortel Networks 1000 - Manual (Page 1011)

Commands and responses 1011
LAPB balanced class of procedure
Applications which use ports on the QPC513 are automatically designated
as BAC, 2, 8 (for example, balanced operation, asynchronous balanced
mode class of procedure with optional functions 2 and 8 implemented).
Balanced configuration
A balanced configuration is one in which two combined stations share
identical responsibilities for exchanging data and control information and
for initiating error recovery functions, as shown in
Figure 288 "Balanced
configuration" (page 1011) .
Combined station
A combined station has balanced link control capability and transmits
both commands and responses to, and receives both commands and
responses from the other combined station.
Figure 288
Balanced configuration
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 423 "Commands and responses" (page 1011) .
Table 423
Commands and responses
Command Response Option
I 8
RR RR
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 02.06 Standard
27 August 2008
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