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13-16 Voice Cards
Model No.
Running Head
FXO Card Error Messages FXO Card
13.4 FXO Card Error Messages
Refer to Appendix B in the System Reference Guide for further information on Error
Messages regarding this card.
13.5 FXO Card Troubleshooting
The FXO card may be faulty if a voice signal is not received at one end of a circuit, or if
signaling is not detected. The following are possible causes:
• Faulty receiving CPE at the near end (where the problem was first noticed)
• Faulty transmitting CPE at the far (opposite) end
• Faulty cabling between the CPE and FXO card at the near end
• Faulty cabling between the CPE and FXO or FXS card at the far end
• T1 or E1 network failure
• Improper card configuration at either end (e.g., time slot and/or WAN port assignments)
First, verify that the T1 or E1 network has not failed. Check for a CGA-Red alarm on the
associated WAN port at the end where the incoming VF signal loss is first noticed. The CGA
indicates that the incoming network signal was lost (or that the receiving WAN port is out of
frame). During the CGA, all voice ports with time slots on that WAN port will also be
disabled, and the associated far-end WAN port will be in a CGA-Yellow alarm state. If the
network is faulty, you must clear that trouble to restore your circuits.
If the network is okay, verify that the proper WAN ports and time slots are assigned to the
associated FXO and FXS voice ports at both ends, as previously outlined in this chapter. In a
point-to-point network, the near-end and far-end FX card ports should both be assigned the
same WAN port and time slot number. Also make sure the other parameters (such as the
transmit and receive TLPs) are set properly at both ends.
If the FX card port parameters are correct at both ends, and if the network is okay, the trouble
is isolated to the FXO card or the associated port. Proceed as follows:
1. At the far end, activate an analog loopback on the FX card port.
2. Send a 0 dBm (digital milliwatt) test signal toward the CPE at that end. That signal will
be substituted for the normal signal coming from the far-end CPE; it will be sent back to
the CPE at your end via the loopback path.
3. Check your CPE for this signal. If it is present, the far-end CPE or cabling to the far-end
FX card is probably faulty. Disable the loopback and test signal there, and fix the problem.
If you still don’t receive a signal, go to step 4.