Nortel ICS Install Manual page 613

• Receive Alarm — yellow LED on indicates a problem
with the digital transmission being received. This half-
duplex link is unusable.
• Receive Error — yellow LED indicates a minor error as a
result of degraded digital transmission. Possible causes are
an ohmic connection, water ingress, or too long a loop.
• Transmit Alarm — red LED on indicates an inability to
transmit. Alarm indication signal (AIS) is being
transmitted to the terminating switch. This half-duplex
link in unusable.
• Transmit Error — yellow LED on indicates a remote
alarm indication (RAI) carrier failure alarm (CFA) is being
sent to the terminating switch. If the Transmit Alarm is not
on, this indicates a far-end or cable problem.
• In service — a flashing green LED indicates that the T1 or
PRI trunks are out of service because of a running
loopback test, or because the DTI is being initialized.
• Loopback test — red LED on while a continuity loopback
test is running.
• All LEDs flashing continuously — the DTI is being
initialized.
3. Run a Maintenance session and any loopback tests as
appropriate.
4. Check the pinout of the cable that connects the DTI to the
termination point from the T1 or PRI service provider or
the external channel service unit, and check that the cable
is properly connected.
5. Check with your T1 or PRI service provider to see if
through-fed repeaters are used on the T1 or PRI span. The
DTI does not provide the DC connection required for
through-fed repeaters.
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Problems with trunk cartridges service / 613
Modular ICS 7.1 Installer Guide