Central Site Remote Access Switch 249
C
ONFIGURING
A
LTERNATE
A
CCESSES
X.25 Accesses
X.25 A
CCESS
C
ONFIGURATION
E
LEMENTS
The X.25 Access configuration elements are divided into seven different categories:
•
X.25 Logical Channel Assignments
•
X.25 Timer Configuration
•
X.25 Reliability, Windows, and Acknowledgment Facilities
•
X.25 Quality-of-Service Facilities
•
X-25 Charging -Related Facilities
•
X-25 Restriction Facilities
•
X.25 Miscellaneous Facilities
Each category has multiple configuration elements that must be entered.
Note:
If you are unsure of any of the configuration values, use the default values where provided.
X.25 L
OGICAL
C
HANNEL
A
SSIGNMENTS
The maximum number of permanent virtual circuits (PVCs) and switched virtual circuits (SVCs)
to be supported. For X.25 over B-channel, a total of 48 virtual circuits are supported; over D-channel
8 virtual circuits are supported. Therefore, the total number of PVCs and SVCs combined cannot
exceed the maximum number of VCs. X.25 logical channel numbers are assigned to each PVC, and
each two-way SVC. (Currently, one-way incoming and one-way outgoing SVCs are not supported.)
M
AXIMUM
N
UMBER
OF
PVC
S
The maximum number of PVCs supported for this X.25 access.
M
AXIMUM
N
UMBER
OF
SVC
S
The maximum number of SVCs supported for this X.25 access.
X.25 T
IMERS
Your PPSN provider should be able to provide you with the optimum values for the X.25 timers. If
you are unable to obtain these values, select the default values. The default values are acceptable
for the majority of network configurations.
T
IMER
T20
This timer designates the time limit in which a restart confirmation must be returned by
the DCE (the PPSN) after a restart request has been issued by the DTE (the CyberSWITCH).
The range for the this timer is 1 to 200 seconds. The default for this timer is 180 seconds.
T
IMER
T21
This timer designates the time limit in which a call connected response must be returned
by the DCE (the PPSN) after a call request has been issued by the DTE (the CyberSWITCH).
The range for the this timer is 1 to 200 seconds. The default for this timer is 200 seconds.
T
IMER
T22
This timer designates the time limit in which a reset confirmation must be returned by the
DCE (the PPSN) after a reset request has been issued by the DTE (the CyberSWITCH). The
range for the this timer is 1 to 200 seconds. The default for this timer is 180 seconds.
T
IMER
T23
This timer designates the time limit in which a clear confirmation must be returned by the
DCE (the PPSN) after a clear request has been issued by the DTE (the CyberSWITCH). The
range for the this timer is 1 to 200 seconds. The default for this timer is 180 seconds.
