Dear Pete,
Here the (rather trivial) RJ45 connector cabling. 
Signals:
1 dummy  1
2 analog 1
3 dummy  2
4 analog 2
5 dummy  3
6 analog 3
7 dummy  4
8 analog 4
9 ground
10 ground
 regards
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Leo Wiggers      | NIKHEF, PO BOX 41882, 1009 DB Amsterdam, Fax 020-5925155
wiggers@nikhef.nl| Phone 020-5925058 , http://www.nikhef.nl/user/p63/