They are similar to modular connectors (as used in RJ11), but feature a side-mounted hook, rather than a bottom-mounted one, and are physically incompatible.
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The jack is still found in Hong Kong, where new installations ceased in 1998, while in Saint Vincent and the Grenadines, new installations ceased in 2001, with RJ11 now used instead.
The HP-HIL bus uses specific 4-pin, 6-pin, or 8-pin SDL connectors, somewhat similar to the 8P8C 8-pin modular connector commonly (though incorrectly) called the RJ-45.
:Not to be confused with RJ-45.
The XJACK was originally used in modem and network cards, to attach a standard RJ11 or 8P8C plug directly to the PC card.
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