Dialogic PCI Linecard Installation and Replacement
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July 2001 Ericsson Enterprise AB
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LED Error Conditions
The LEDs at the back of the D/240PCI-T1 will light when an error is encountered. The
following section describes what error conditions will cause an LED to light and provides
some troubleshooting advice.
Green LED
Signal present LED; indicates powered up and receiving signal from external T-1 source.
However, this LED will light even if the tip and ring connections on the cable are
miswired. If this LED is lit, but you are still getting errors from the network, verify that
the tip and ring connections on your cable are wired correctly.
Yellow LED
Alarm to indicate loss of frame synchronization at the far end of the external network.
Green and Yellow LEDs
May indicate a short in the transmit wire pair (the pair connected to the transmit pins on
the D/240PCI-T1). Remove the D/240PCI-T1–to–CSU cable and test it for shorts.
Red LED
Alarm to indicate loss of frame synchronization on the incoming line from the external
network.
Red and Yellow LEDs
Red and yellow LEDs may light in the following conditions:
•
The transmit and receive pairs between the CSU and the D/240PCI-T1 may be
reversed. Check the D/240PCI-T1–to–CSU cable for incorrect connections. Consult
your CSU documentation for proper pinouts and signal direction.
•
You may have a short in the Receive wire pair (the pair connected to the receive pins
on the D/240PCI-T1). Remove the D/240PCI-T1–to–CSU cable and test it for shorts.
