Appendix A Troubleshooting - ZyXEL Communications Prestige 861 User Manual

Make sure you have securely attached the proper cables to the proper ports. Refer to Rear Panel section for
this information. If your Prestige still does not work properly, refer to the table shown next.
PROBLEM
No LEDs are on when I
turn the Prestige on.
The LAN LED(s) is off.
The VDSL LED is not on or
is blinking.
Troubleshooting
This chapter covers potential problems and the corresponding remedies.
Your Prestige or power adaptor may have malfunctioned. Check that the
power cable is connected properly and that you are using the supplied
power adaptor for your region. Make sure the power source is turned on and
that the Prestige is receiving sufficient power. Try a different power outlet. If
all this fails, contact your vendor.
Verify that the attached device(s) is turned on and properly connected.
Make sure the Ethernet cards are working on the attached devices.
Verify that the proper network cable type is used and its length does not
exceed 100 meters. Use unshielded twisted pair (UTP) or shielded twisted-
pair (STP) Ethernet cables for the Ethernet ports. For 10 Base-T
connections, use 100W 2-pair UTP/STP Category 3, 4 or 5 cable(s). For
100 Base-TX connections, use 100W 2-pair UTP/STP Category 5 cable(s).
Make sure the distance from the Prestige to the DSLAM does not exceed
1.25km (3750feet). Rates deteriorate the further away the DSLAM is from
the modem. Check with your telephone company that the telephone line
quality is good enough for VDSL transmission.
If G.hs is disabled in the Prestige, then make sure the Prestige and the
remote DSLAM have the same VDSL parameters. Use the CI commands
(refer to the chapter on VDSL commands) to check your VDSL parameters
such as band plan, band modifier, channel type (is interleave delay set?),
encapsulation mode, VPI/VCI numbers, QoS parameters and service
categories.
When G.hs is enabled in the Prestige, the DSLAM dictates (and overrides)
all modem VDSL parameters.
Prestige 861 VDSL Modem
Troubleshooting
CORRECTIVE ACTION
Appendix A
A-1