Circuit Pack Descriptions
Issue 8.0 July 2002
7-99
General Description of Operation 7
The OC48 TRMTR A/D circuit pack interfaces with the outgoing high speed
optical line. The OC48 TRMTR A/D circuit pack selects up to sixteen 155.52 Mb/s
signals from sixteen DS3, STS1E, and/or OC3 (1.3 STD) circuit packs, one
protection DS3 circuit pack, one protection STS1E circuit pack, or the OC48
RCVR A/D circuit pack in the opposite direction (bidirectional ring applications).
The 739B5, 739C5, 739E_, 739G_, 739H_, 739J5, 739P5, 739R5, and 739S5
OC48 TRMTR A/D circuit packs demultiplex the 155.52 Mbs signals to STS-1
signals and select 48 STS-1 signals (out of 96 STS-1 signals) for STS-1 time slot
assignment. The 739B5, 739C5, 739E_, 739H_, 739G_, 739J5, 739P5, 739R5,
and 739S5 OC48 TRMTR A/D circuit packs then multiplex the 48 STS-1 signals
into sixteen 155.52 Mb/s signals.
The sixteen 155.52 Mb/s signals are frame-synchronized and multiplexed into an
STS-48 signal (2.488 Gb/s). SONET line and section overhead bytes are also
inserted into the STS-48 signal. The electrical STS-48 signal is then converted to
an optical OC-48 signal for transmission over a single-mode fiber.
The OC48 TRMTR A/D circuit pack is available in the standard 1.3 µm, high
performance 1.3 µm,andstandard1.5µm options. For more information about
loss budgets and transmission distances when operating with or without the
FT-Lightwave Booster Amplifier (FT-LBA), refer to Volume I, Section 10,
“Technical Specifications.”
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