User's Manual

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Cisco 3200 Series Mobile Access Router Hardware Guide
OL-5816-04
Chapter 1 Mobile Access Router Card (MARC)
MARC Component Systems
MARC Component Systems
The industry-standard architecture (ISA) buses and peripheral component interconnect (PCI) buses on
the Cisco 3200 Series Mobile Access Router cards provide power to the components on the cards. Both
buses comply with the PC/104-Plus standard. The ISA bus allows PC/104-Plus ISA signals to pass
through the card bus, but the Cisco cards do not use any of the signals.
The PCI bus signals allow the Cisco cards to communicate. Non-Cisco cards cannot communicate with
the Cisco 3200 Series Mobile Access Router cards over the PCI bus.
Caution If you add non-Cisco cards that generates signals on the PCI bus, the router might shut down. Please do
not add non-Cisco cards that generate signals on the PCI bus.
Figure 1-1 shows the MARC header and bus locations.
Figure 1-1 MARC Header and Bus Locations
Note The PC/104-Plus standard requires that the PCI Bus and the ISA bus utilize keying features in the
standard stacking headers to guarantee proper module installation. On the PCI bus, pin D30 is removed
and the D30 opening plugged. On the ISA bus, pin C19 and B10 are removed, and the C19 and B10
openings are plugged.
MARC Router Signals
Cisco 3200 Series router cards do not support any ISA bus signals. The PCI bus connector supports
communication between Cisco 3200 Series Mobile Access Router cards.
Note Non-Cisco MIC cards cannot use PCI signals. The use of PCI signals by non-Cisco cards causes
unpredictable results. You cannot add 3rd-party devices that might attempt to communicate with the
SMIC through the ISA or PCI bus.
1 PCI Bus 2 ISA Bus
3 Ethernet Header 4 Multifunction Header
74518
1 2
4
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