Verilink C100 (880-502893-001) Product Manual - Manual (Page 53)

LED Indicators and Diagnostics
6/15/99 C100 and C150 T1/FT1 CSU/DSU 4-13
LED should blink at a fast rate. This means a V.54 loop On command
has been sent to the channel in the remote unit. The remote unit’s Local
Channel Loopback LED should be blinking at a slow rate and the
remote unit should be in a loopback. Pushing the Start push-button
again will send a V.54 loop Off command to the remote unit removing
the loop. All loopback LEDs at the remote unit will go off and the local
unit’s Remote Channel Loopback LED will stop blinking fast and be
on solid.
C150 Select and Start Push-button
The eight Loopback/Pattern LEDS work in conjunction with the Select
and Start push-button. During normal operation all of the eight LEDs
are off. To activate the switches, hold the Select push-button in for 3
seconds (this helps prevent unauthorized tampering). Pushing the
Select push-button once will light the Local NI Loopback LED.
Pushing the Select push-button again, will turn off the Local NI
Loopback LED and light the Local DSX1 Loopback LED. Each time the
Select push-button is depressed, the LED that is on will go out and the
LED to the right will go on selecting a new function. When the Test
Pattern LED is on, pushing the Select push-button will cause the Test
Pattern LED to go out and the Local NI Loopback LED to go on. Push
the Select push-button until the desired function is lit. Pushing the
Start push-button will cause that function to be activated and that LED
will blink at a fast rate (approximately 200 milliseconds). Pushing the
Start push-button again will cause the function to be deactivated.
Only one loopback at a time may be selected. The last loop command
received will override all other loopbacks. An existing loopback must
be turned off before a new loopback may be turned on.
When neither switch is depressed for two minutes, both switches will
be deactivated. To re-activate the Select switch will have to be held i
for 3 seconds again.
Example: Setting a Remote DSX1 Channel Interface Loopback.
Hold the Select push-button until the Local NI Loopback indicato
lights (approximately 3 seconds). Push the Select push-button 5 times
to advance to the Remote DSX1 Loopback LED which should be lit.
Now push the Start push-button and the Remote DSX1 Loopback LED
should blink at a fast rate. This means a V.54 loop On command has
been sent to the DSX1 channel in the remote unit. The remote unit’s
Local DSX1 Loopback LED should be blinking at a slow rate and the
remote unit should be in a DSX1 loopback. Pushing the Start push-
button again will send a V.54 loop Off command to the remote unit
removing the loop. All loopback LEDs at the remote unit will go off
and the local unit’s Remote DSX1 Loopback LED will stop blinking
fast and be on solid.