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Chapter 1 Product Overview
Maintenance Bus
1-14
Cisco 12006 and Cisco 12406 Router Installation and Configuration Guide
OL-11497-03
Code Download
A portion of the line card operating software can be downloaded from the RP to
the line card over the MBus. Because the MBus is relatively slow compared to the
switch fabric, only enough code is downloaded to the line card for it to access the
switch fabric and complete the download process.
Diagnostics
The diagnostic software image is downloaded from the RP to the line card during
the test sequence.
Environmental Monitoring and Alarms
The MBus module on each component monitors the environment of that
component as follows:
• Line cards and the RP are monitored for temperature by two temperature
sensors mounted on each card. The MBus module makes voltage adjustments
through software for the +2.5 VDC, +3.3 VDC, and +5 VDC DC-DC
converters.
• Clock and scheduler cards and switch fabric cards are monitored for
temperature by two temperature sensors mounted on each card. The MBus
module makes voltage adjustments through software for the +2.5 VDC and
+3.3 VDC converters.
• The MBus module on the alarm card makes voltage adjustments for +5 VDC.
• Environmental monitoring includes voltage monitoring, temperature
monitoring, and sensing for the blower module fans.