HP 16500B - Manual (Page 86)

7 If your system includes an expansion frame, connect the interface cable from the
expansion frame to the HP 16500L interface module located in the HP 16500B
mainframe.
In order to ensure correct connection of the interface cable, the 68-pin "D" connectors on the
cable are asymmetric in shape. They only fit into the ports on the cards when oriented to
match the shape of the ports.
When reconnecting the interface cable, make sure the cable connector is properly seated into
the port on the expansion interface card by pulling the cable connector without pressing the
release tabs. If the connector is properly seated, it will remain connected to the port.
Replacing Assemblies
To remove and replace the HP 16500L interface module
6–11