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PBX switchboard, 1975. A telephone switchboard is a device used to connect circuits of telephones to establish telephone calls between users or other switchboards. The switchboard is an essential component of a manual telephone exchange, and is operated by switchboard operators who use electrical cords or switches to establish the connections.
Phone plug mated in a phone socket. The plug's grooved tip is held firmly by the socket's spring tip contact. When not mated, this spring instead connects to the flat switch contact for detecting a plug. TS and TRS plugs of different sizes. A phone connector is a family of cylindrically-shaped electrical connectors primarily for analog audio ...
"Phone plug" is widely used in the US, but is confusing because it sounds like a connector for a telephone (though this is actually where it originated; just for switchboards instead of homes) "TRS connector" is widely used in the US at least, but only applies to TRS connectors.
A typical relay service conversation. A telecommunications relay service, also known as TRS, relay service, or IP-relay, or Web-based relay service, is an operator service that allows people who are deaf, hard of hearing, deafblind, or have a speech disorder to place calls to standard telephone users via a keyboard or assistive device.
The tip and ring convention is based on the 1 ⁄ 4 ″ (6.5 mm) TRS phone connectors, which were employed in telephone switchboards in the 19th and 20th centuries, where the tip contact of the connector is separated from the ring contact by a spacer of insulation.
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Balanced connections typically use shielded twisted-pair cable and three-conductor connectors. The connectors are usually three-pin XLR or 1 ⁄ 4 inch (6.35 mm) TRS phone connectors. When used in this manner, each cable carries one channel, therefore stereo audio (for example) would require two of them.
Business Phone Business Phone Compact; Business Phone 50; Business Phone 128i; Business Phone 250; CP-400 (crossbar) CPP (Media Gateway) MD110; MX-ONE MX-ONE Telephony Switch (TSW) MX-ONE Telephony Server (TS) Rurax