Peter and Graham are correct (as always!) however, there is one important point to remember....
Beogram turntables without built-in pre-amps use pin 7 for Datalink and pin 6 for Data Ground, whereas BeoSystem 2300 will be designed to work with the later (pre-amplified) Beograms which use pin 6 for Datalink and pin 7 for Data Ground. Trust B&O to confuse things!
Hence, if you add an external pre-amp, you will need to swap these two pins over when connecting the Datalink wires. Most "off-the-shelf" pre-amp kits do not include Datalink wires, but any competent cable supplier should be able to add these for you if required.
Best regards,
Steve.
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