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the MAC daughter card is accessed by the upper layer protocol stacks within the
DMM (SNMP, Telnet) through the MLAN.
The E-MAC can be installed on either the EC-DMM or the 8260 media modules.
When installed on the 8260 media modules, E-MAC can collect statistics about all
the Ethernet segments on the backplane, but will not be able to collect per-port
or per-module statistics for the 8250 modules which are on Ethernet_1, 2 and 3.
This is due to the fact that the 8250 modules will be using parallel addressing on
the backplane while the EMAC installed on the 8260 media modules will only be
able to collect statistics from the serial pins. However, if the E-MAC is installed
on the EC-DMM, it will be able to collect a full range of statistical information
about any segment that it is attached to, regardless of whether that segment is
using parallel or serial addressing. This is because the EC-DMM provides
parallel to serial address translation.
Also note that E-MAC is always able to collect full statistics about 8260 modules
irrespective of which type of module (EC-DMM or 8260 media modules) the
E-MAC is installed on and which networks the 8260 modules are attached to.
2.5.1.2 The Serial Control Interface (SCI)
The SCI is the same as that used in the 8250. All modules, 8250 and 8260 alike,
use the SCI to transmit module and port configuration data. The controller
module uses the SCI to gather VPD from the modules, and to get power and
cooling status. The controller module, in conjunction with the DMM, also uses
the SCI as a medium to change the status of power supply to the modules and to
remove and add modules in the event of a change in the power or cooling
subsystems. Figure 12 illustrates the relationship between the MLAN, SCI and
the modules.
Figure 12. 8260 Management Buses
Chapter 2. Backplane Architecture 27