Hi Graham
I'm not 100% of what the cable is but I can tell you the mount is an EQ3 to EQ5 upgrade. The hand set is a Synscan and according to the manual the cable is a RS2332 to RJ11. This is the mount
http://www.skywatcheraustralia.com.au/?page_id=1175 only mine is black not white.
Regards John