System Cards
PSU Services
The PSU/Services unit provides the DC-DC conversion from the –50V supply to power the logic and other electronic circuits.
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BABT TIF
The Telephone Interface Card (TIF) provides the only intelligence in the system and controls all concentrator operations.
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CB Line Card
The CB Line Card is designed to connect up to four telephones and can be located in any standard line card slot in the STS concentrator.
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LB Line Card
The LB Line Card is designed to connect up to four telephones and can be located in any standard line card slot in the STS telephone concentrator.
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BABT Auto
The BABT Approved Auto Line Card is designed to connect up to four telephones to the Public Switched Telephone Network (PSTN)
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PETS Line Card
The PETS Line Card interfaces to a Whiteley Unit located at a level crossing. The unit controls up to four Emergency Telephones sited at the crossing.
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