Verilink C100 (880-502893-001) Product Manual - Manual (Page 50)

LED Indicators and Diagnostics
4-10 Verilink C100 and C150 T1/FT1 CSU/DSU 6/15/99
Remote
Synchronous
Channel Loopback The Remote Synchronous Channel LOOPBACK LED is on solid when
it is selected by the Select push-button. When the Remote Synchronous
Channel LED blinks at a fast rate, the T-1 CSU/DSU has sent a V.54
LOOP ON command to the Synchronous Channel interface (see circled
loop in
Figure 4-14 for C100.) at the other end. Since this loopback
latches the Synchronous Channel interface in the unit at the other end,
care must be taken to ensure that a V.54 LOOP OFF command is sent
(pushing the Start push-button again) when finished testing. The color
of this LED is red.
Figure 4-14 Remote C100 T-1 CSU/DSU in Remote Channel Loopback
Figure 4-15 Remote C150 T-1 CSU/DSU in Remote Channel Loopback
Test Pattern C100
The Test Pattern LED is solid red when it is selected by the Select push-
button. Pushing the Start push-button when this LED is lit, will cause a
2047 test pattern to be sent and the Test Pattern LED to blink red at a
fast rate. The 2047 pattern will always be sent from the T-1 CSU/DS
to the Network (see circled area in example i
Figure 4-16 for the C100)
unless a Local CI Channel Loopback (see circled area in example in
Figure 4-17 for the C100) has been activated.
The 2047 pattern checker will look for a 2047 pattern from the
Network, and if detected, will light the Test Pattern LED green. If a
Local CI Channel Loopback has been activated, the 2047 test pattern
will be sent to the Channel and the 2047 pattern checker will look fo
the pattern from the Channel. The Test Pattern LED is a dual colo
red/green LED.
Pattern
Checker
Pattern
Generator
T-1 CSU Channel
Remote T-1 CSU/DS
Pattern
Checker
Pattern
Generator
T-1 CSU Channel
Local T-1 CSU/DSU
Bridge Bridge
NI NI
NETWORK Router Router
Pattern
Checker
Pattern
Generator
T-1 CSU DSX1
Channel
Remote T-1 CSU/DSU
Pattern
Checker
Pattern
Generator
T-1 CSU DSX1
Channel
Local T-1 CSU/DSU
PBX
Bridge
PBX
Bridge
NI NI
NETWORK
Router Router