ZyXEL Communications VLC1324G User Manual

Chapter 3 VLC Troubleshooting

VLC1324G User’s Guide

The VDSL2 link is up, but data cannot be transmitted.

The computer behind a VDSL2 modem or router cannot access a local server connected to the 
line card.

The SYNC-rate is not the same as the configured rate.

Table 11   VDSL2 Data Transmission Troubleshooting

1

Check the line card’s port isolation settings. 
If the subscriber is having problems with video or other high-bandwidth services, make 

sure the line card’s VDSL2 port’s data rates are set high enough.

2

Check the VLAN configuration.

3

Ping the MSC from the computer behind the VDSL2 modem or router.
If you cannot ping, connect a VDSL2 modem to a VDSL2 port (that is known to work).
If the VDSL2 modem or router works with a different VDSL2 port, there may be a problem 

with the original port. Contact the distributor.
If using a different port does not work, try a different VDSL2 modem or router with the 

original port.

Table 12   Local Server Troubleshooting

1

Refer to 

 to make sure that the subscriber is able to transmit to the 

line card.

2

Make sure the computer behind the DSL device has the correct gateway IP address 

configured.

3

Check the VLAN configuration.

4

Check the cable and connections between the line card and the local server.

5

Try to access another local server.
If data can be transmitted to a different local server, the local server that could not be 

accessed may have a problem.

Table 13   SYNC-rate Troubleshooting

1

Connect the VDSL2 modem or router directly to the VDSL2 port using a different telephone 

wire.

2

If the rates match, the quality of the telephone wiring that connects the subscriber to the 

VDSL2 port may be limiting the speed to a certain rate. 
If they do not match when a good wire is used, contact the distributor.