Nortel Networks 8000 - Manual (Page 219)

7 LAPB and X.25 configuration
Nortel Secure Router 8000 Series
Configuration -WAN Access
Figure 7-7 X.25 channel division
• PVC range
’ Incoming-only channel range
unused
' Two-way channel range
unused
’Outgoing-only channel range
unused
For the meanings of these six parameters, refer to Table 7-1.
Table 7-1 Description of X.25 channel range delimitation parameters
Parameter Description
LIC Lowest Incoming-only Channel
HIC Highest Incoming-only Channel
LTC Lowest Two-way Channel
HTC Highest Two-way Channel
LOC Lowest Outgoing-only Channel
HOC Highest Outgoing-only Channel
Each range (except PVC ranges, it is 1 to (lic-1)) is defined by two parameters respectively
working as upper limit and lower limit. The parameters are in the range of 1 to 4095
(including 1 and 4095). The parameters are correct only if the following conditions are met:
- In strict ascending order, i.e. 1 < lic < hic < ltc < htc < loc < hoc < 4095.
- If the upper limit (or lower limit) of a range is 0, then the lower limit (or upper limit)
shall also be 0, (which indicates this range is disabled to use).
Note the following points:
- On the two sides (DTE and DCE) of a physical connection, these six parameters of
X.25 must be symmetric, as different settings at the two sides may result in an
improper procedure and cause transmission failures.
- You should first set the range of the unidirectional call in channel, then set the range
of bidirectional call-in channel, and finally set the range of unidirectional call-out
channel.
- In the configuration process, you should determine to implement the correct settings
of parameters. (Pay attention to the default settings of each parameter on the basis of
assuring an ascending order.)
7-16 Nortel Networks Inc. Issue 5.3 (30 March 2009)