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Line card

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Title: Line card  
Author: World Heritage Encyclopedia
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Subject: Ringing (telephony), MoSys, Two-wire circuit, 1-Meg Modem, MagicJack
Collection: Telecommunications Equipment
Publisher: World Heritage Encyclopedia

Line card

A Western Electric 500G line card for 1A2 Systems

A line card or digital line card is a modular electronic circuit designed to fit on separate a printed circuit board (PCB) and interface with a telecommunications access network.[1]

A line card typically interfaces the twisted pair cable of a plain old telephone service (POTS) local loop to the public switched telephone network (PSTN). Telephone line cards perform multiple tasks, such as analog-to-digital and digital-to-analog conversion of voice, off-hook detection, ring supervision, line integrity tests, and other BORSCHT functions. In some telephone exchange designs, the line cards generate ringing current and decode DTMF signals. The line card in a subscriber loop carrier is called a subscriber line interface card (SLIC).[2][3]

A line card can terminate a line supporting voice POTS service, ISDN service, DSL service, or proprietary ones. Some line cards are capable of terminating more than one type of service.[3]

Since an access network element is usually intended to interface many users (typically a few thousand), some exchanges have multiple line terminations per card. Likewise, one network element can have many line cards.

See also


  1. ^ "line card Definition from PC Magazine Encyclopedia". Retrieved 2014-02-19. 
  2. ^ "Line Card". Retrieved 2014-02-19. 
  3. ^ a b "What is line card? - Definition from". Retrieved 2014-02-19. 
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