NEC Univerge sv8500 Manual page 2743

7.10.2 Loop-Back Diagnosis between DRU/DAU and Transmission Equipment
This section explains the procedure of loop-back diagnosis between the DRU/DAU and the transmission
equipment when the DLI/DAI and the DRU/DAU are connected via the transmission equipment.
Procedure for Loop-Back Diagnosis between DRU/DAU and Transmission Equipment
START
Remove the cover of the DRU/DAU.
ALM Lamp (red) on the DRE card in the DRU/
DAU lights.
Set the corresponding switch of each DRE card
UP (ON), referring to the table below.
Switch setting for local loop-back check
DRU/DAU
SN880 DRE-A
SN880 DRE-B
SN904 DREA-B
SN877 DRE-B
SN885 DRE-A/B
SN886-DRE-A/B
SN887 DRE-A/B
SN905 DREB-B
SN8061 DREH-A
SN8063 DREJ-A
SN8064 DREK-A
Lamps on the DRE card are indicating as follows.
• LINK (G): ON, flashing, or OFF
• ALM (R): ON (or flickering)
A
CIRCUIT SWITCH
CARD NAME NAME
PZ-CC63 SW1-7
PZ-CC63-B SW61-7
PZ-CC93-A SW61-7
PZ-CC79/
SW71-7
PZ-30ELCP
PZ-CC94/
SW71-7
PZ-23ELCN
PZ-CC95/
SW71-7
PZ-30ELCR
PZ-30ELCR SW71-7
PZ-30ELCU SW71-7
VOL.3-256
CHAPTER 2 TERMINAL-RELATED DEVICES
See if the power supply to the transmission
equipment is normal. Test the connection be-
tween the DRU/DAU and the transmission
equipment.
FAULT : DRU/DAU is faulty.
Refer to: DRU/DAU Fault