P841C Central-Side VDSL Modem
Troubleshooting
6-1
This chapter covers potential problems and possible remedies. After each problem description, some
steps are provided to help you diagnose and solve the problem.
6.1 VDSL LED
The VDSL LED is not on.
Table 6-1 Troubleshooting the VDSL LED
STEPS CORRECTIVE
ACTION
1
Disconnect the phone wire coming from the VDSL port of the P841C and connect the subscriber’s VDSL
modem or router directly to the VDSL port of the P841C using a different telephone wire.
If the LED turns on, check for a problem with the building’s phone wire.
2
Set the VDSL modem to “auto-negotiate”. If this is not possible, set it to 100 Mbps, half duplex mode.
3
Use the VDSL commands to reset and reconnect the VDSL channel (see
sections 4.1.6 and 4.1.7
).
4
Log into the P841C, enter the VDSL debug command (see
section 4.1.10
), take screen shots of this
information and send it to your nearest customer support representative.
5
If the LED remains off, contact the distributor.
6.2 Data Transmission
The VDSL LED is on, but data cannot be transmitted.
Table 6-2 Troubleshooting Data Transmission
STEPS CORRECTIVE
ACTION
1
Disconnect the phone wire coming from the VDSL port of the P841C and connect the VDSL modem or
router directly to the VDSL port of the P841C using a different telephone wire.
If data can be transmitted, check for a problem with the building’s phone wire.
2
Check to see that you are using the correct VDSL mode (see
section
4.1.1
).
3
Use the VDSL commands to reset and reconnect the VDSL channel (see
sections 4.1.6 and 4.1.7
).
4
Connect the VDSL modem or router to another P841C (VDSL port).
If the VDSL modem or router works with a different P841C, then there may be a problem with the original
P841C. Contact the distributor.
5
If using a different P841C does not work, try a different subscriber VDSL modem or router with the
original P841C.
6
Log into the P841C, enter the VDSL status command (see
section 4.1.8
) and the VDSL debug command
(see
section 4.1.10
), take screen shots of this information and send it to your nearest customer support
representative.
Chapter 6
Troubleshooting
Summary of Contents for P841C
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