Editing 600 series connector (section)

===Other varieties===

====60x plugs====

In general, 60x where x is any numeric other than 0 or 5 indicates a non-standard plug. Compatibility and designs vary from maker to maker.

====61x sockets====

In general, 61x where x is any numeric other than 0 or 1 indicates a non-standard socket. Compatibility and designs vary from maker to maker.

====Extensions====

Extension leads are generally four conductor, including pair one and one other pair, wired straight through pin to pin. Some incorporate an adaptor plug which includes a 610 socket, often with all six conductors connected, allowing the extension to also serve as a double adaptor.

====Double adaptors====

Double adaptors are almost always six conductor, wired pin to pin, with a 605 plug and two 610 sockets in parallel.

====Mode 3 adaptors====

A mode 3 adaptor appears physically to be a double adaptor, but the sockets are one 610 and one 611, with pair one of the 610 wired to pair two of the 611, and pair one of the 611 to pair one of the plug. Treatment of the other conductors varies, and may be assignable.