Troubleshooting; Data Unit Troubleshooting - Northern Telecom DMS-100 Series Installation And Maintenance Manual

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TROUBLESHOOTING

0
0
0
0 SYMPTOM
0
0 The Power LED
0 is off on a DU.
0
0
0
0
0
0
0
0
0 The Power LED
0 is off on all
0 DUs (Rack-
0 mount).
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0
0
0
0
0
0
0
0
0
0
0
0
0 Power LED
0 flashes.
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0
0
0
0
0
0
0
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TABLE 6.1

DATA UNIT TROUBLESHOOTING

PROBLEM
DU power is not
connected
(desktop).
DU power is not
connected
(rackmount).
On-board fuses
are blown
(rackmount).
110 Vac power
not available
(shelf powered
by NT4X25DK
power supply)
-48V DC power
not available
(shelf powered
by NT4X25DL
power supply)
On-board fuse
is blown.
DU does not
have synchroni-
zation with
DMS-100 Family
switch.
Table Continued
297-2121-226
VINTAGE 05.01
ACTION
Connect DU power
cord to 110 V ac outlet.
Plug DU into backplane
and turn power supply on.
Replace the data unit.
Ensure AC power is avail-
able at the 110 Vac out-
let, reconnect power cord
if necessary, and
shelf power supply
turned on.
Ensure -48Vdc is
able at the
ensure that the DC supply
is connected and
connections are
reversed, and that
shelf power supply
turned on.
Replace the fuse.
(desktop) Connect
line to Teladapt jack
DU. See Making the Con-
nections to the
page 4-5.
(rackmount) Connect data
line at C0 or
strip. See Connecting
Data Lines to the
on page 4-12.
supply
ensure
is
avail-
source,
that
not
the
is
data
on
DU on
terminal
Shelf
6-3