10P10C
The 10P10C connector is commonly referred to as an RJ50 connector, although this is not a standard registered jack in the Universal Service Order Codes. The 10P10C has 10 contact positions and 10 contacts.
The most common uses of the 10P10C connector are in proprietary data transfer systems, such as the Digiboard and Equinox Super-Serial multi-port TIA-232 adapters. 10P10C connectors are also used to implement RS-485 interfaces, and for data link connections in APC and Eaton uninterruptible power supplies. In the latter case, a keyed 10P10C plug with a protrusion on the pin 1 side near the back is used.
This connector is also used by some vendors, such as BOCA, for expansion modules of their multi-port RS-232C serial boards. For example, Cyclades (later absorbed by Equinox) used pin 1 as an "RI" (ring indicator) signal, which is seldom used, allowing an 8P8C plug to be inserted to their 10P10C socket for most applications. The Cisco Systems STS-10X terminal server features this connector. FordNet, a five-pair communications networking medium, also used the 10P10C between terminals.
Motorola uses the 10-pin connector as a microphone connector in several of their mobile radio product lines.
The 10-pin connector is also used by Demag Cranes AG in some pendant connections.
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