Acer Altos S300, User Manual

Page: 17 / 78

7
I/O modules
There are two I/O option slots located at the rear of the enclosure.
One of these must contain an Enclosure Services Module (ESM)
or a Concentrator Services module (CSM)
and the other slot must
contain the Terminating Services Module (TSM) or a second
Concentrator Services Module (CSM) for dual CSM configuration.
The I/O slot located on the left of the enclosure as viewed from the
back is called I/O Slot A and the I/O slot located on the right is called I/O
Slot B.
The I/O modules can be inserted into either of the I/O
slots .
Note: For a detailed information of the I/O modules, see page 20.
The following sections will describe the modules and how they should
be used.
Enclosure Services Module
The Enclosure Services Module (ESM) has three primary functions. It
acts as a SCSI bus pass-through from external cabling to the internal
busses. Secondly, it terminates the end of the SCSI bus in joined mode.
Finally, it provides monitoring, reporting and control of the system
storage enclosure. The ESM reports status and receives control
information via the SCSI bus per the SCSI-3 Enclosure Services
specification and also the SAF-TE specification.
1
2
1
2
0 I
0 I
I/O Module
I/O Module
Mute
The I/O Modules can be inserted into either I/O slot