User guide

Troubleshooting 6-5
6
If the yellow alarm is disabled, this condition is ignored. In the alarm
menu, indicate ÒRAIÓ for Network status. The CTS line on Data DTE is de-
asserted.
The NET LED Flickers Intermittently between Red, Yellow
and Green
Make sure the timing source is properly conÞgured. Timing should be set
to NETWORK if the network is the source.
If it is not the source, timing should be set to INTERNAL at one E1 end, and
NETWORK at the other end.
If youÕre not sure that the network is the source, contact the network
provider and discuss your circuit order. The provider will tell you if the E1
network is the source.
If the timing source is properly conÞgured and the NET LED continues to
ßicker between red, yellow, and green, isolate the Solo E1 DSU with the E1
test set to see if the problem clears.
Place the E1 test set into the proper timing mode (provide timing or
recover timing). You cannot use the loopback plug in this application since
it would require us to provide timing and would not allow us to see if we
can recover timing from a valid E1 source.
If the NET LED continues to ßicker, call Digital Link Technical Support for
assistance.
The Data Port TD/RD LEDs do not Illuminate
Make sure the DTE cable is plugged into the appropriate connector on the
back of the unit. The connectors are labeled port one, port two, etc.,
depending on your Solo E1 DSU type.
Check the timeslot allocation to make sure bandwidth is allocated to the
speciÞc DATA port.
Run a lamp test from Menu-9 Diagnostics to make sure the LEDs are
working.
Make sure the DTE devices connected physically to the units are sending
data to each other. The serial line will not transmit data or receive data if it
is shut down.
Using the terminal interface, set DATA Port Status = ÒLoss of Signal.Ó
If you have eliminated the above as a cause, place your data test set on the
problem port.