Avaya S8700 Maintenance Manual page 173

PDATA-PT (Packet Data Line Port)
Data Applications and System Port Connectivity
As part of each data application, the SPE connects itself to the application device
through a system port. The application device may be an external terminal,
printer, or data-module, or it may be circuitry internal to the switch, as is the case
for the Announcement Circuit pack data-module used to save and restore
recorded announcements. The figure below is an example of a system port
connection using a second Data Line circuit pack (DAT-LN-BD) port to provide
dial-in access for a remote terminal.
A feature may not have a permanent connection to a system port. For example,
the announcement feature uses the system port when it is saving or restoring
announcement data to or from the Mass Storage System. The rest of the time it
does not use a system port. This makes troubleshooting these links more difficult,
since the symptoms may appear on one side of the link while the problem is on
the other. If the link is no longer up, there is no way to determine which system
port experienced the problem.
Active
SPE Complex
Packet Bus
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TDM Bus
Standby
SPE Complex
(if duplicated)
Processor Bus
Figure 8-29. Typical System Port Connection
555-233-142
Processor Bus
Other SPE
PKT
Components
INT
TN1655
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Other SPE PKT
INT
Components
TN1655
EIA
PDATA
TN553
M3
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DAT-LINE
TN726B
EIA
Printer,
CDR,
Data
Terminal,
Dial-up
G3-MT
Issue 1 May 2002
DAT-LINE
TN726B
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M2
or
8-869