Digi TransPort WR31 User Manual page 602

Configure legacy protocols
LAPB Parameters
LCN
The value of the first LCN that will be assigned for outgoing X25 calls on LAPB.
LCN direction: Up Down
Determines whether the LCN for outgoing X.25 calls on LAPB is incremented or decremented
from the starting value.
Max VCs: Unlimited
The maximum number of Virtual Circuits (VCs) on a LAPB interface. When the maximum has
been reached, then the backup call occurs immediately, or the call will clear if there is no backup
call. If this parameter is set to 0, there is no limit.
B-Channel Number
An ISDN number for calls switched in the direction of LAPB 0 or LAPB 1.
Enable ENQ Char
When this parameter is set to On, when an incoming call on LAPB is switched and the router
connects to it, the X.25 switch sends a data packet on the LAPB X.25 SVC containing the ENQ
character.
LAPB 0 Default Packet Size: 128 256 512 1024
The default packet size for calls being switched onto LAPB 0. The default packet size is 128.
Other possible values are 256, 512, or 1024 bytes.
LAPB 0 Default Window Size: 2 1 3 4 5 6 7
The default window size for calls being switched onto LAPB 0. The default window size is 2. The
valid range is 1 to 7.
LAPB 1 Default Packet Size: 128 256 512 1024
The default packet size for calls being switched onto LAPB 1. The default packet size is 128.
Other possible values are 256, 512, or 1024 bytes.
LAPB 1 Default Window Size: 2 1 3 4 5 6 7
The default window size for calls being switched onto LAPB 1. The default window size is 2. The
valid range is 1 to 7.
LAPB 2 Default Packet Size: 128 256 512 1024
The default packet size for calls being switched onto LAPB 2. The default packet size is 128.
Other possible values are 256, 512, or 1024 bytes.
Digi TransPort WR Routers User Guide
Configure Protocol Switch software
602