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 Sinclair QL and 128k ZX Spectrum home computers used type 630W connectors for their serial ports (on the Spectrum 128 and +2, MIDI signals could also be sent from the port).
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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.
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