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Lucent Technologies DDM-2000 OC-12 - Page 270

Lucent Technologies DDM-2000 OC-12
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363-206-295
Circuit Pack Descriptions
Issue 1 December 1997 7-69
23G/23G-U OLIU Quick Reference Summary 7
Transmit Functions 7
The major transmit functions of the 23G/23G-U OLIU circuit pack are as follows:
Selects 12 STS-1 signals from the TSI circuit packs
Adds SONET transport overhead
Byte-interleaves and scrambles the STS-1 signals to produce an STS-12
signal
Modulates a laser transmitter to produce an OC-12 signal.
Receive Functions 7
The major receive functions of the 23G/23G-U OLIU circuit pack are as follows:
Receives an OC-12 optical signal and converts an OC-12 signal to an
electrical STS-12 signal
Extracts STS-12 clock and retimes the received data
Demultiplexes the STS-12 signal into 12 STS-1 signals
Extracts and processes the STS-1 transport overhead
Processes the STS-1 pointer and frame-synchronizes the STS-1 signals
Processes the receive clock and provides a loop-timing clock to the TGS
circuit packs.
Control Functions 7
Control functions are as follows:
Protection switching for TSI circuit packs
Inventory information (
CLEI
code, date of manufacture, etc.).
Maintenance Signal Functions 7
The 23G/23G-U OLIU major maintenance signal functions are as follows:
Inserts and detects STS-1 path AIS
Inserts STS-1 path unequipped signal
Inserts and detects OC-12 line AIS
Inserts and detects OC-12 line FERF
Detects OC-12 line failures (LOS, LOF, AIS, and BER)
Detects OC-12 line signal degrade BER.

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