HP PCI Multiplexer Family Cabling, Diagnostics, and Troubleshooting Manual

Overview
PCI MUX 8-Port Card
Chapter 118
PCI MUX 8-Port Card
Figure 1-2 illustrates a PCI MUX 8-port card. This card is capable of
controlling the operation of up to 8 high speed serial ports. There is a
maximum limit of four Mux 8 Cards per system. If there are also PCI
MUX 64-port cards in the same system, the maximum number of PCI
MUX 8-port cards are reduced by one for each PCI MUX 64-port card in
the system. For example, if there is one PCI MUX 64-port card in a
system, the maximum number of PCI MUX 8-port cards would be three.
Figure 1-2 PCI MUX 8-Port Card