3Com 3032 Configuration Manual page 203

Configure X.25
N1 value represents the maximum number bits of I frame that DCE or DTE
wants to receive from DTE or DCE.
N2 value represents the maximum number of times that DCE or DTE tries to
successfully send a frame to DTE or DCE.
Table 232 Configure LAPB N1, N2
Operation
Configure LAPB parameter N1
Restore the default value of LAPB parameter N1
Configure LAPB parameter N2
Restore the default value of LAPB parameter N2
By default, n1 is 12032, and n2 is 10.
d Configure LAPB T1, T2, T3
LAPB T1, the retransmission timer (T1) determines how long a frame that is
already sent, can remain unacknowledged before retransmission. The value of
T1 should be larger than the maximum interval between sending a frame and
receiving its response frame. Retransmission timer is started after sending the
frame but if response is not received and timer is expired then frame will be
retransmitted.
LAPB T2, the receiving timer (T2) determines when to send a confirmation
frame to the opposite DCE (or DTE) before T1 expires (T2<T1).
LAPB T3, the idle channel timer, determines when to report the long-time idle
channel state to the packet layer. The timer value must be larger than T1 in
DCE (T3>T1). If T3 is 0, it indicates that the timer is not set.
Table 233 Configure LAPB system timer T1, T2, T3
Operation
Configure LAPB system timer T1, T2, T3
Restore the default value of LAPB system timer T1,
T2, T3
By default, T1 is 2000ms; T2 is 1000ms and T3 is 0ms.
X.25 configuration includes:
Configure X.25 interface
Configure X.25 interface supplementary parameter
Configure X.25 datagram transmission
Configure the supplementary parameters of X.25 datagram transmission
Configure X.25 sub interface
Configure X.25 switching
Configure X.25 load balancing
Besides configuring X.25, appropriate modification to some LAPB parameters in
certain cases can also optimize the performance of X.25.
Configure X.25
Command
lapb max-frame n1-value
undo lapb max-frame
lapb retry n2-value
undo lapb retry
Command
lapb timer { t1 t1-value |
t2 t1-value | t3 t3-value }
undo lapb timer{ t1 | t2 |
t3 }
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