Loop Back Procedure; Blue Alarm; Falt Led; Bsy Led - Toshiba Perfecptione Installation And Maintenance Manual

PERCEPTION,h,x
Tl/DS-1
SEPTEMBER 1991
3) Blue Alarm:
The blue alarm signal is used to
inform the far end that the local site is perform-
ing the DS-1 level loop back test. The blue
alarm is identified as the unframed all "ONE"
pattern for the duration of five frames.
4) FALT LED:
Indicates software-detected faults
or a disabled state, caused by an input com-
mand from the maintenance terminal
(TPER
Program),
or while ports are programmed.
LED indicates fault occuring in more than one
channel.
5) BSY LED:
Indicates the busy/idle status of
the 24 channels on the NDTU PCB. LED is ON
when one or more channels are busy.
0
FALT
0
BSY
YALM
0 -:q-
BALM
MFALM 0 0 FALM
I
FIGURE lo-BLUE ALARM
-@-
FALT
0
BSY
YALM 0 0 BALM
MFALM 0 0 FALM
1
FIGURE ll-FALT LED
3.70 Loop Back Procedure
The following procedure describes how the loop
back testing is conducted:
1) Disconnect the NDTU from the Channel Ser-
vice Unit (CSU).
2) Remove the NDTU from the PERCEPTION
system.
3) If they have not been set that way, change TB3
and TB4 to master mode, position 2-3.
4) Set TB5 and TB6 to master loop back, position
l-2.
5) Reinstall the NDTU in the PERCEPTION sys-
tem, and allow it to sync up.
6) If all the LEDs on the NDTU go out, the loop
back test
has passed. If any of the LEDs stays
on, replace the NDTU.
7) Remove the NDTU from PERCEPTION.
8) Return TB3 and TB4 to their original settings.
9) Return TB5 and TB6 to their original settings.
10) Reinstall the NDTU in the PERCEPTION sys-
tern.
YALM
MFALM
FALT
BSY
BALM
FALM
FIGURE IP-BSY LED
-9-