Compaq EK-SMCPO-UG. C01 manual Emu

Expansion Pedestal Option 4-5

The SCSI bus extender module extends the allowable electrical length of the bus to accommodate longer physical SCSI cable connections between the base and expansion pedestals.

The EMU is an internal circuit board, which monitors the operation of the pedestal (Figure 4–4). The EMU monitors power supply voltages, fans, temperatures that are reported to the user, and controls (turns on and off) the audible alarm and status LED on the front panel of the pedestal. It is connected to the SCSI bus and powered by internal cabling. The following external components on the rear panel of the expansion pedestal are part of the EMU board:

■The alarm switch (S1) that enables (up) or disables (down) the audible alarm

■The External Fault Condition connector allows the EMU to monitor the status of a user-selected device

EMU

3000-37

Figure 4-4. EMU circuit board location