Issue 5 November 2000
363-206-208
Introduction
Lucent Technologies - Proprietary
See Notice on first page
circuit packs and the FN circuit packs. The TSI circuit packs also take a 51.84 Mb/s
clock signal and an 8 kb/s frame synchronization signal from the TGS circuit pack and
distributes them to the MAIN OLIU and FN circuit packs. The TSI-1 is dedicated to the
Main-B-1 OLIU and TSI-2 to the Main-B-2 OLIU. The BCP3 TSI circuit pack provides
flexible STS-1 cross-connect capability.
Located to the left of the TSI circuit packs are two MAIN OLIU circuit packs. Each MAIN
OLIU will receive 12 STS-1 signals, perform frame alignment and pointer processing,
and map them into 1 STS-12 signal. This STS-12 signal is then converted to an optical
signal and transmitted to the far-end via single mode fiber. The OLIU also receives an
OC-12 optical signal and demultiplexes it to 12 STS-1 signals which are then routed to
the TSI circuit packs. Each OLIU is a bidirectional circuit pack. There are two OLIU
circuit packs to provide to provide path protection switching.
Located at the top of the OC-12 shelf are two TGS timing circuit packs. These circuit
packs will provide a 51.84 Mb/s clock signal and a 8 Kb/s frame synchronization signal.
The timing packs are 1x1 protected.
DDM-2000 OC-12 Fan Shelf Description
Forced air cooling is always required for the DDM-2000 OC-12 multiplexer shelf. The
DDM-2000 fan shelf, ED-8C733-30, G8, provides forced air cooling for DDM-2000
OC-12 shelves that are bay mounted in a controlled environment [for example, central
office (CO), controlled environment vault (CEV)].
The number of fan shelves required in a bay is determined by the number of DDM-2000
OC-12 shelves in the bay (each shelf requiring a fan shelf). Refer to the “Equipment and
Rear Access Cable Installation” or “Equipment and Front Access Cable Installation”
section of this manual for fan shelf requirements.
Summary of Contents for DDM-2000 OC-12
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