Northern Telecom DMS-100 Series Installation And Maintenance Manual page 110

0 297-2121-226
0 VINTAGE 05.01
0
0
0
0 SYMPTOM
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0 Can connect but
0 can not
0 exchange data.
0
0
0
0
0
0
0
0
0
0
0
0
0 6-6
TABLE 6.1 (Continued)
DATA UNIT TROUBLESHOOTING
PROBLEM
Both DUs are
set to external
clock.
Connection may
be over analog
trunk and a
modem pool is
required.
Transmission
problem.
Table Continued
ACTION
mount DUs see Setting the
Options on page 4-13).
Set one DU to
clock. (For desktop DUs
see Setting the
(NT4X25AA /AE /AN /AP /AX
/AZ) on page 4-6 and Set-
ting the
(NT4X25AF /AG /AH /AK) on
page 4-7). (For rackmount
DUs see Setting
Options on page 4-13).
If connection is over an
analog trunk the call can
not be made without
modem pool.
If modem pooling
assigned to the DU
press the Resource key on
the DU to engage a modem
pool.
If modem pooling
assigned to the DU line,
contact the operating
company for assignment.
Make sure the DTE and
have the same operating
parameters.
Make sure the
turned on and
connected to the DU.
Perform a far-end
back test. (For desktop
DUs see Loopback Tests on
page 5-4). (For
mount DUs see
Tests (NT4X25AD
/DF) on page 5-10).
internal
Options
Options
the
a
is
line,
is not
DU
DTE is
properly
loop-
rack-
Loopback
/CH /AV