User`s manual

MXIbus-3 : Remove the Terminating Networks from Middle VXI-MXI

Modules

If you have more than two mainframes, remove the MXI and INTX

terminating networks from the VXI-MXI modules in the middle of the

MXIbus daisy chain.

The VXI-MXI is shipped from the factory with terminating SIP resistor

networks installed. If the VXI-MXI will be the first or last device in the

MXIbus daisy-chain, you should leave these internal terminators in place.

If the VXI-MXI is not going to be an end device, the terminating resistor

networks must be removed from their sockets and stored in a safe place in

case the MXIbus system changes. All six MXIbus networks must be either

installed or removed.

Like the MXIbus, the INTX cables have matched impedance and require

termination networks at the first and last devices in the INTX chain. These

terminations minimize the reflections caused by impedance discontinuities

at the ends of the cable. The INTX daughter board comes with terminating

resistors installed. If the daughter board is not going to be an end device,

remove the terminating resistor network and store them with the MXI

networks.

MXI

Cable

INTX

Cable

First VXI-MXI in Chain: MXI

and INTX Terminating

Networks Present

Last VXI-MXI in Chain: MXI

and INTX Terminating

Networks Present

REMOVE MXI and INTX

Terminating Networks

INTX

MXI

Figure 3-10. MXIbus Daisy Chain

C-Size Configuration Guide Set Up the System for Multiple Mainframes 3-9