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Circuit Pack Descriptions
7-98 Issue 3 June 2001
BBG20 TMUX Quick Reference Summary 7
Transmit Functions 7
The BBG20 TMUX transmit functions are as follows:
■ Receives a B3ZS-encoded DS3 signal from a DSX-3
■ Recovers DS3 clock and NRZ data
■ Calculates parity errors on the DS3 input
■ Demultiplexes the M13 or C-bit formatted DS3 signal into 28 DS1s
■ Maps the 28 DS1s into VT1.5s and then into an STS-1
■ Inserts STS-1 path overhead
■ Provides the STS-1 signal to the OLIU circuit packs.
Receive Functions 7
The BBG20 TMUX receive functions are as follows:
■ Interprets the STS-1 pointer values
■ Terminates the STS-1 path
■ Disinterleaves the STS-1 signal into 28 VT1.5s and interprets VT pointer
values
■ Converts the VT1.5 signals to 28 DS1 signals
■ Multiplexes the 28 DS1 signals to an M13 or C-bit formatted DS3 signal
■ B3ZS encodes the outgoing DS3 signal
■ Pre-equalizes the DS3 signal (with LBO) and transmits it to a DSX-3.
Control Functions 7
The major control functions are as follows:
■ Protection switching for BBG20 TMUX circuit packs
■ STS-1 path overhead processing
■ Internal fault detection
■ Inventory information (
CLEI
code, date of manufacture, etc.)
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