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Circuit Pack Descriptions
Issue 1 December 1997 7-31
BBG11 3DS3 Quick Reference Summary 7
Transmit Functions 7
The 3DS3 circuit pack transmit functions are as follows:
■ Receives three B3ZS encoded DS3 signals from a DSX-3
■ Recovers three DS3 clocks and nonreturn to zero (NRZ) data
■ Synchronizes the data signals to STS-1 signal rate
■ Inserts STS-1 path overhead
■ Provides three STS-1 signals to the TSI circuit packs.
Receive Functions 7
The following receive functions are performed by the BBG11 3DS3 circuit pack:
■ Desynchronizes the incoming STS-1 signals
■ Terminates the STS-1 paths
■ Optionally checks and/or corrects P-bit parity errors
■ B3ZS encodes the outgoing DS3 signals
■ Pre-equalizes the DS3 signals (with line build-out) and transmits them to
the DSX-3.
Control Functions 7
The major control functions are as follows:
■ Protection switching for TSI and 3DS3 circuit packs
■ STS-1 path overhead processing
■ Internal fault detection
■ Inventory information (
CLEI
code, date of manufacture, etc.).
Maintenance Signal Functions 7
The major maintenance signal functions are as follows:
■ Detects STS-1 path AIS coming from the fiber
■ Detects STS-1 path unequipped signal coming from the fiber
■ Inserts DS3 AIS toward the fiber and DSX-3
■ Detects DS3 AIS coming from the fiber
■ Inserts and detects STS-1 path yellow signal to/from the fiber
■ Detects DS3 line failure (LOS and BER).
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