Circuit Pack Descriptions
7-110 Issue 8.0 July 2002
Detailed Description of Operation 7
Figure 7-33 shows an overall block diagram of an OC48 REGENR circuit pack.
The OC48 REGENR circuit pack accepts one 2.5 Gb/s non-return-to-zero (NRZ)
SONET compatible optical signal.
Transmission Circuitry 7
Figure 7-33. OC48 REGENR Circuit Pack Block Diagram
Fiber access to the OC48 REGENR circuit pack is via two fixed ST-type buildout
blocks and removable
ST
-type, FC/PC-type, or SC-type lightguide buildouts on
the circuit pack faceplate (labeled IN and OUT). Lightguide buildouts for the IN
connector are chosen based on the attenuation desired, the type of OC48
REGENR circuit pack, and the type of connector interface the single-mode
lightguide jumper is equipped with. Lightguide buildouts for the OUT connector
arechosenbasedonthetypeofOC48REGENRcircuitpackandthetypeof
connector interface the single-mode lightguide jumper is equipped with. There are
two types of lightguide buildouts available for 39B1 and 39C1 OC48 REGENR
circuit packs:
ST
-type and FC/PC-type. There are three types of lightguide
buildouts available for 39B2, 39C2, 39J2, 39R2, and 39S2 OC48 REGENR circuit
packs:
ST
-type, FC/PC-type, and SC-type. All factory-equipped OC48 REGENR
circuit packs come with a removable
ST
-type 0-dB lightguide buildout on the IN
and OUT connectors. When installing or removing lightguide buildouts, do not pull
the beam (front tab) outward. Pulling the beam (front tab) outward could result in
breaking the beam (front tab).
The optical-to-electrical module receives the OC-48 signal and converts it to an
electrical STS-48 signal. The optical-to-electrical module also detects loss of
PLL
Power
Circuit
Board
Controller
Circuit
Transmit
Byte
Processor
Electrical
To
Optical
Module
Byte
Processor
Receive
Electrical
To
Optical
Module
AIS
Clock
Clock
Select
BCLAN
Byte
Demultiplexer
Byte
Multiplexer
-48V (A)
-48V (B)
SONET Section Overhead
SONET Section Overhead
tpa 814225/01
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