363-206-295
Circuit Pack Descriptions
Issue 1
December 1997
7-45
BBG12 3STS1E Quick Reference Summary
7
Transmit Functions
7
The 3STS1E circuit pack transmit functions are as follows:
■
Receives three B3ZS-encoded EC-1 signals from an STSX-1
■
Recovers three STS-1 clocks from three incoming data streams
■
B3ZS decodes and descrambles three incoming data streams
■
Frame synchronizes the incoming EC-1 signal using the STS-1 pointer
processor
■
Provides three STS-1 signals to the TSI circuit packs.
Receive Functions
7
The following receive functions are performed by the BBG12 3STS1E circuit pack:
■
Receives three incoming STS-1 signals from the TSI circuit pack
■
B3ZS-encodes and scrambles data, converts data to bipolar format, and
sends it to the STSX-1
■
Pre-equalizes the EC-1 signals (with line build-out) and transmits them to
the STSX-1.
Control Functions
7
The major control functions are as follows:
■
Protection switching for TSI and 3STS1E 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
■
Inserts STS-1 path AIS toward the fiber and STSX-1
■
Detects EC-1 line failures (LOS, LOF, AIS, and BER)
■
Detects EC-1 line signal degrade BER.
