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AI296 Version 9.8x User’s Guide
Link Configuration: Quick X.25 Configuration
6-66
This example displays Max Packet Size set to 256 and Packet Window Size set to 5.
Passive Link Settings
Description
The passive link configuration settings are configured using two menu items:
z X.25 passive link mode—Defines the mode of operation for an X.25 link as one of
the following:
z Normal—Specifies the mode used for normal X.25 service.
z Passive—Specifies the mode that allows AI296 to operate with the SCCS
application of the AT&T 5ESS. The SCCS application requires redundant links
at the 5ESS. These links are called SCC0B and SCC1B. Only one link is
active at a time. The 5ESS constantly tries to bring up whichever link is idle. If
the 5ESS has SCC0B active, it will try to bring up SCC1B. If SCC1B comes
up, the 5ESS will drop SCC0B and send information on SCC1B. Passive
mode ensures that either SCC0B or SCC1B will be up but not simultaneously.
z Extended—Specifies the mode that supports passive link capability to the 5ESS
over a TCP/IP network. Extended mode ensures that either SCC0A or
SCC1A will be up but not simultaneously and will temporarily take down the
corresponding link if connections fail or cannot be placed because the
corresponding remote link is down.
z Passive link with clocking—Enables or disables an X.25 passive link from
supplying a clock value while the link is in the inactive state.
Note: Old AT&T 5ESS interface cards (TN983) require clocking with the passive
link set up.
Menu Item Type
Toggle
Quick X.25 Menu
Link being configured . . . . . . . . . . . . . . . . . . . . . . . . . 02
Interface Mode . . . . . . . . . . . . . . . . . . . . . . . DTE [DCE]
Port speed (0=external clocking) . . . . . . . . . . . . . . . . . . . . 9600
X25 Passive Link Mode . . . . . . . . . . . [Normal] Passive Extended
Passive Link with Clocking . . . . . . . . . . . . . Enabled [Disabled]
Frame Level Disconnect . . . . . . . . . . [Active] Passive Other
Frame Window Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Max Packet Size . . . . . . . . . . . . . . . . . . . . 128 [256] 512
Packet Window Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5