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Circuit Pack Descriptions
7-38 Issue 1 December 1997
BBG11B 3DS3 Quick Reference Summary 7
Transmit Functions 7
The 3DS3 circuit pack transmit functions are as follows:
â– Receives three B3ZS encoded DS3 signals from a DSX-3
â– Recovers three DS3 clocks and NRZ data
â– Optionally checks and/or corrects P-bit parity errors
â– Synchronizes the data signals to STS-1 signal rate
â– Inserts STS-1 path overhead
â– Provides three STS-1 signals to the TSI circuit packs.
Receive Functions 7
The following receive functions are performed by the BBG11B 3DS3 circuit pack:
â– Desynchronizes the incoming STS-1 signals
â– Terminates the STS-1 paths
â– Optionally checks and/or corrects P-bit parity errors
â– B3ZS encodes the outgoing DS3 signals
â– Pre-equalizes the DS3 signals (with LBO) and transmits them to the
DSX-3.
Control Functions 7
The major control functions are as follows:
â– Protection switching for TSI and 3DS3 circuit packs
â– STS-1 path overhead processing
â– Internal fault detection
â– Inventory information (
CLEI
code, date of manufacture, etc.).