Intel MPCMM0002 Chassis Data Modules CDMs, CDM Overview, CDM Management, CDM Health LED States

Chassis Data Modules (CDMs)—MPCMM0002 CMM

8.0Chassis Data Modules (CDMs)

8.1CDM Overview

The CDM (Shelf FRU) is a repository of chassis-specific information (such as serial number of the chassis and backplane), capabilities of the system (number of slots, maximum power per slot, whether dual star or mesh, etc.), and a few administrator- definable configuration options. The latter category allows the administrator to define more conservative limits than the maximum shelf ratings. For example, an administrator could set the maximum power draw per feed to 30 A even if the shelf itself were capable of handling 50 A per feed. CMMs use this information to provide functions such as electronic keying (E-keying), controlling the power state of the system, etc.

The CDMs sit on their own dedicated I2C links from each CMM, as shown in Figure 18.

Figure 18. Chassis Data Module I2C Routing

CDM 1

CMM 1

CMM 2

CDM 2

8.2CDM LED

	The CMM drives a single tri-color LED to indicate the status of the module.
Table 14.	CDM Health LED States
	Color	Description
	Off	No power to chassis
	Solid Green	Normal operation
	Solid Red/Amber	Attention status (error condition) - CMM configures error color

8.3 CDM Management

The CMM expects the CDM to act like a simple 24C64 I2C EEPROM device that the CMM can read from and write to. CDM 1 is at I2C address 0xA2 and CDM 2 is at I2C address 0xA4. The CDMs are expected to store some limited configuration information, such as the power-on state for each slot. The CDM contains the list of what slots are connected

	Intel NetStructure® MPCMM0002 Chassis Management Module
July 2007	Hardware TPS
Order Number: 309247-004US	43