Lucent Technologies DDM-2000 OC-3, User & Service Manual

Page: 1357 / 2536

363-206-285 Acceptance:
NTP-004
Issue 3, June 2001 Page 3 of 6
DDM-2000 OC-3 M
ULTIPLEXER
DO ITEMS BELOW IN ORDER LISTED . . . . .FOR DETAILS, GO TO
3.
NOTE:
If external timing mode is specified but the timing reference
was not available at shelf turnup, the TGS/TG3 circuit pack
option switches may not be set correctly. The specified
timing mode must be set on the TGS/TG3 circuit packs.
NOTE:
If the option switch setting is changed, an update must be
done by momentarily depressing the UPD/INIT button on the
SYSCTL after the TGS/TG3 circuit packs are reinstalled.
NOTE:
If external timing is selected and the NE ACTY LED remains
lighted after the TGS/TG3 circuit pack is reinserted, use the
CIT and the
rtrv-sync
command to check the operational
mode of the system. If the mode is
Holdover
instead of
External
, check that the incoming timing references are
connected. Also check
Mode Switching
(revertive or
nonrevertive) and the external
DS1 Line Code/Format
switch settings.
Use
rtrv-sync
command at each node to verify proper timing
options. At least one node in the network should be set for
DS1
External
or
Free Running
unless timing is obtained from an
optical interface (FN-C) to another portion of the network. Verify
TGS/TG3 circuit pack options are set correctly [DLP-513].
4. Determine the optical loss of the optical facility from office records
or by making the required measurements.
5. Use
rtrv-fecom:
and
set-fecom:com=enabled
commands
to verify/enable the DCC channel between all nodes, as required.