NTP-024: Circuit Order 363-206-285
Page 11 of 24 Issue 2, February 2000
DDM-2000 OC-3 MULTIPLEXER
DO ITEMS BELOW IN ORDER LISTED. . . . . FOR DETAILS, GO TO
29.
NOTE:
If line timing mode is specified or external timing mode is
specified but the timing reference was not available at the
OC-3 shelf turnup, the TGS/TG3 option switches are
probably set for
free running
. Before this configuration is
established, 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.
DLP-510Set timing mode on TGS/TG3 circuit packs to the timing mode
specified in work order or office records. (OC-3 Reference:
363-206-285,
DDM-2000 OC-3 Multiplexer, TARP Release 13 and
Later, User/Service Manual (TOP)—Volume II
, DLP-513).
30. At new OC-12 shelf, remove OLIU optical loops from MAIN-B-1
slot.
31. Determine the optical loss of the optical facility from office records
or by making the required measurements.
32. Connect optical fibers from adjacent OC-3 shelf MAIN 2(P)
24/29-Type OLIU to new OC-12 shelf MAIN-B-1 OLIU.
DLP-510
DLP-513
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