# Pulse link repeater

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In [telecommunications](/source/Telecommunications), a **pulse link repeater** (PLR) is a device that interfaces concatenated [E and M signaling](/source/E_and_M_signaling) paths.

A PLR converts a [ground](/source/Ground_(electricity)), received from the E lead of one signal path, to −48 VDC, which is applied to the M lead of the concatenated signal path.

In many commercial [carrier](/source/Carrier_signal) systems, the [channel bank](/source/Channel_bank) cards or modules have a "PLR" option that permits the direct concatenation of E&M [signaling](/source/Signaling_(telecommunications)) paths, without the need for separate PLR equipment.

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Adapted from the Wikipedia article [Pulse link repeater](https://en.wikipedia.org/wiki/Pulse_link_repeater) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Pulse_link_repeater?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.