IBM EXP400 Type 1733, Руководство по техническому обслуживанию и ремонту

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Chapter 2. ESM configuration switches
This chapter provides general information about ESM functionality as it relates to
ESM configuration switch settings. The ESM configuration switches control how
power is supplied to the expansion unit and what expansion unit services are
enabled (for example, switching between a rack configuration and a tower
configuration or switching between a single bus and a dual-bus configuration.) In a
dual-bus configuration, each bus uses seven drives. A single-bus configuration uses
all 14 drives.
An ESM contains five sets of configuration switches, shown in the following
illustration.
Box-ID switch
(SW2)
SW1
SW5 SW3 SW4
Note: If both ESMs are installed, the ESM on the left must have valid switch
settings. The switch settings on the ESM that is installed in the right bay are
ignored. If only one ESM is installed, it must be in the left bay.
Configuration switches are summarized in Table 2 and described in this section.
Table 2. Factory default configuration switch settings
Switch location Position Description
Factory default
switch setting
Configuration switch
SW1
1 Reserved Off
2 Reserved On
3 Reserved On
4 Reserved Off
© Copyright IBM Corp. 2002
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