1132 Appendix A LAPB Data Link Control protocol
Command Response Option
RNR RNR
REJ REJ or FRMR 2
SABM UA
DISC DM
Legend:
I: Information
RR: Receive ready
RNR: Receive not ready
REJ: Reject
SABM: Set asynchronous balanced mode
DISC: Disconnect
RSET: Reset
FRMR: Frame reject
UA: Unnumbered acknowledge
DM: Disconnect mode
Option 2: Provides ability for more timely reporting of I frame sequence errors
Option 8: Limits the procedure to allow I frames to be commands only
Description of procedure
The basic LAPB procedures must be implemented to satisfy the following:
•standard use of the poll/final bit (for more information, see
ISO-4375-1979-[E])
•exception condition reporting and recovery implemented in accordance
with BX.25 and ADCCP specifications
•link set-up and disconnect implemented according to BX.25
specifications
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Copyright© 2003-2008, Nor tel Networks
.