Tut Systems XL-12000B User Manual page 16

XL-12000B
HIGH-SPEED NETWORK MODEM
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 B. If it meets the limits, then have the line tested
for defects.
Another reason for continuous blinking is that both modems
are either Masters or Slaves. Verify by checking both modem's
Master/Slave switch on the front panel. 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.
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 that 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).
12 TUT SYSTEMS 7.0 TROUBLESHOOTING