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From Wikipedia, the free encyclopedia

A Western Electric 400G line card for 1A2 key systems
Northern Telecom World Line Card NT6X17BA, circa 1995

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

A line card typically interfaces with a 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.

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See also

References

  1. ^ "line card Definition from PC Magazine Encyclopedia". Pcmag.com. Retrieved 2014-02-19.
  2. ^ "Line Card". Cscprinters.com. Retrieved 2014-02-19.
  3. ^ a b "What is line card? - Definition from WhatIs.com". Searchitchannel.techtarget.com. Retrieved 2014-02-19.
This page was last edited on 15 October 2023, at 03:30
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