XL-12000S
MANAGED, HIGH-SPEED NETWORK MODEM USER GUIDE
10.0 TROUBLESHOOTING
TUT SYSTEMS
53
Both modems are configured as Masters or Slaves. Verify by
checking both modems’ configurations in the “C” Modem
Configuration screen. Make sure that one of the modems is a
Master and the other is a Slave. Check all patch cables to be
sure the pinout is correct and connections are well seated.
4.
The DSL Link LED blinks for a long time.
Blinking for a long time can indicate failure to communicate
with the other modem within the acceptable noise parameters
or that the distance between modems exceeds 12,000 feet.
Verify the length of the DSL line and ensure it meets the length
limits described in “Appendix C”. If it meets the limits, then
have the line tested for defects.
Blinking a few times (2 or 3) indicates that both modems are in
Master mode. Verify by checking both modem configurations in
the “C” Modem Configuration screen. Make sure that one of
the modems is a Master and the other is a Slave. A Master
modem will send out a pulse on the wire to try and communicate
with a Slave modem. If both modems are configured as Master
they are sending out these pulses and receiving a pulse from
the remote end thinking it’s a Slave. Upon further examination,
the modem determines it’s not a Slave and continues to try
and send out a pulse.
5.
The 10Base-T LED never illuminates.
If connecting to a hub, make sure the Ethernet connection
switch on the back of the modem is set to “Normal”. Check the
hub to see that its link light is illuminated. If the light is still not
illuminated, try a different straight-through cable.
If connecting to a PC, server or workstation, make sure the
Ethernet connection switch on the back of the modem is set to
“Crossed”. Verify the link light is illuminated on the PC.
If the 10Base-T cable being used was not the cable provided,
make sure it adheres to the pinout assignments for 10Base-T
(see Appendix A).
