Inc. Active Module Carrier User's Manual

3.3.3 PASS-THROUGH CONNECTORS

One major difference between the VME bus and the VXI bus is that the outer rows of the P2

connector are not defined on the VME bus and they are defined on the VXI bus. For this reason,

the VX402C-64 Active Module Carrier provides a Pass-Through Connector system that be used

to optionally connect or not connect the VME P2 Rows A & C signals to the VXI P2 Rows A &

C signals.

The VX402C-64 can be shipped with an optional pass-through connector cable (11028508-

0001). This cable is used to make internal connections between the P2 and J2 connectors on the

VX402C-64. When the cable is installed, signals on the J2 connector of the VME module are

routed to signals on the P2 connector of the backplane. Only use this cable for modules which

utilize the outer rows on the J2 connector and completely adhere to the VXI specification. If the

VME module has no outer row connections, it is unnecessary to install the cable.

If the VME module has P2 signals which do not conform to the VXI spec, it may be necessary to

make a custom pass-through cable. Also, if the VME module does not support the outer row of

the J2 connector, a longer cable may be used to directly access these signals. Pinout details for

the pass-through connectors can be found in Appendix A. Figure 8 shows the placement of the

pass-through connectors on the VX402C-64.

Pass-Through

Connectors

J11

J12

To P2 Rear

Connector

To J2 Front

Connector

Figure 8. Pass-Through Connector Location

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