Paradyne COMSPHERE 3000 Series Installation Manual page 110

Models 3151/3161 Interface Connections
Diagnostic Channel Extension
Cable
A 12-inch cable with 8-pin modular plugs at each end
is used to connect two Auxiliary Backplanes (see
Figures B-12 and B-13.
Figure B-12. Diagnostic Channel Extension Cable Connectors
Figure B-13. Diagnostic Channel Extension Cable (Feature Number 3100-F1-910)
3000-A2-GA31-80 December 1994 B-17