Troubleshooting Guide

One or more signaling links help to achieve connection to an SS7 network. The physical link interface
implementation is through adapter cards inserted into the gateway PC. The gateway can support up to two PCI
SS7 adapter cards although one card is adequate for most installations. Each adapter card provides four
signaling links and requires a dedicated PCI slot within the machine. You can use one, two, three or four links
per card as necessary.
Each adapter card supports four 56 or 64 Kbit/sec SS7 links over a V.35 electrical interface. The clocking
provided from the network (CSU/DSU) determines the actual baud rate. Four 10−foot DTE cables accompany
each card. Each cable terminates in a 34−pin male block connector with a standard V.35 pinout.
Problem
AT&T SS7 Linkset is either unavailable or inaccessible, and either of these messages appears in Monitor ICR
on an Admin Workstation (AW) or in Alarm Tracker:
"SS7 linkset unavailable."•
"SS7 network inaccessible."•
Cause
These error messages usually indicate that there is a network fault somewhere between the Cisco ICM NIC
and the AT&T network, or directly in the AT&T network.
Solution
Cisco ICM 4.1 and Earlier Versions
Specifically, these types of messages indicate that the Cisco ICM NIC does not receive digital clock pulses
from the AT&T network.
As a first step, cold−boot the problematic Cisco ICM NIC. If the problem persists, open a trouble ticket with
both Cisco and AT&T for further investigation.