Nortel DMS-100 Series Maintenance Manual page 343

c. To find the internal node number, enter <mp * * * * * cp e nn 0>
(where nn equals the external node number obtained from
QUERYPM in step a).
d. Enter <sp * * * * * n>. This entry accesses the signal processor new
messaging level.
e. Enter <n>. This entry accesses the netlayer sublevel.
f. Enter <neta>. This entry accesses the net address sublevel.
g. Enter the internal node number obtained in step a, when the system
prompts for this number.
h. Enter the unit that corresponds to the messaging link in question.
i. Note the data link number specified as open.
j. Enter <* d>. This entry accesses the dl data level.
k. Enter <v dl> (where dl equals the data link number obtained in steps
h and i). This entry verifies that you work with the correct link. The
output indicates the same type PM as the remote you work with (for
example, rlcm_fmt).
l. Enter <r dl> (same as in step k). This entry displays hex values, that
correspond to control bytes received from the remote. (To halt, enter
return twice.)
m. Remove the DS-1 interface card for the link at the remote end.
n. Verify hex values equal #FF. If not, make sure you remove the
correct DS-1 interface card and monitor the proper data link number.
If both are correct, check for miswires or shorts on the link.
Remove repeater cards until values equal #FF, and correct the
problem. If the problem corrects, proceed to step o.
o. At the remote, loop back the link to test (transmit to receive on port)
toward the host.
p. With the span looped back, verify the values equal one of the
DMS-X control byte values (usually #1E). These values appear in
the following table.
DMS-X control byte
MIS
SOM
PACK
NACK
Advanced troubleshooting procedures 10-9
Value
#8D
#4B
#1E
#55
DMS-100 Family Maintenance Manual ABSK007
Meaning
May I send
Start of message
Positive acknowledgment
Negative acknowledgment