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Circuit Pack Descriptions
Issue 3 June 2001
7-91
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 data services device
■ Detects DS3 AIS coming from the fiber
■ Inserts and detects STS-1 path yellow signal to/from the fiber
■ Detects DS3 OOF from the fiber
■ Detects DS3 B3ZS violation threshold crossings from the data services
device
■ Inserts and detects STS-1 path trace.
BBG20 Transmultiplexer 7
Purpose of Circuit 7
The BBG20 Transmultiplexer (TMUX) circuit pack provides a low-speed interface
between asynchronous DS3-rate signals and SONET STS-1 signals. The BBG20
TMUX provides DS1, DS3, VT, and STS-1 performance monitoring capabilities
with R13.0 and later.
BBG20 TMUX Faceplate Indicators 7
The TMUX circuit pack faceplate indicators are shown in Figure 7-35. The red
FAULT LED lights by the SYSCTL on detection of BBG20 TMUX circuit pack
failure. In the event of an incoming DS3 signal failure, this LED will flash on and
off. The green ACTIVE LED lights when the circuit pack is active (carrying
service).
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