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Circuit Pack Descriptions
Issue 3 June 2001
7-25
DS1 Output 7
— DS1 Output (MULT) — a buffered copy of the external DS1 input reference
used for intershelf timing
— DS1 Output (SYNC OUT) — derived from received OC-3 line for network
timing distribution.
Transmission - Electrical Interface 7
The electrical transmission circuit packs are the DS1, DS1PM, HDSL, MXRVO,
DS3, TMUX, and STS1E.
BBF1/BBF1B DS1 Circuit Pack Description 7
Purpose of Circuit 7
The DS1 circuit pack provides a low-speed interface between asynchronous DS1
rate signals and SONET virtual tributary group (VT-G) signals.
DS1 Faceplate Indicator 7
The DS1 circuit pack FAULT indicator is shown in Figure 7-9. This red FAULT LED
is lit by the SYSCTL on detection of a DS1 circuit pack failure. In the event of an
incoming signal failure, this LED flashes on and off.
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