ISL recovery
The D-channel goes down if the following occurs:
•
the modem, ADM, ASIM, or HSDM power is off
• the hotline call between the system and the modem, ADM, ASIM, or HSDM is dropped
The system handles these possibilities in the following way:
1. The system CPU schedules a data link diagnostics program, which runs in
background mode.
2. If this program finds that the link is not established, it requests the maintenance
program to reestablish the data link by reinitializing the hotline connection.
3. The hotline call is brought up as it is during installation.
The ASIM can automatically reinitiate the hotline call with the Forced DTR option
set to ON.
A modem with auto-dial capability is required to automatically bring up the D-
channel in the configuration below.
Note:
The Radio Frequency Interference (RFI) filter connectors are attached to the QCAD42 cable.
T
o install the RFI filters, see the instructions for installing the EMI filters in the system
installation documents.
ISDN Signaling Link maintenance
90 ISDN Primary Rate Interface Maintenance November 2011
Comments? infodev@avaya.com
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