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RS423
more than three FIPS drives can exist in the 9710. The remaining available drive
slots can be used by SCSI drives.
Twenty SCSI data buses can exist on the I/O tower: 10 in and 10 out.
Twenty Fibre Channel data buses can exist on the I/O tower (with 9840 drives
only): 10 in and 10 out.
The 3270 ports on the I/O tower currently are not used.
RS423
The 9710 uses RS423 electronics in its control interface, rather than RS232. The
RS423 and RS232 protocols are the same, but the RS423 electronics can drive a
signal to greater distances.
The maximum RS423 cable length is 60 m (200 ft).
SCSI Library Robotic Interface
The fast/narrow interface is single-ended or differential, and supports up to
eight devices including the host.
The fast/wide interface is differential only, and supports up to 16 devices
including the host.
Both interfaces are provided with the fast/wide 68-pin connector.
3-10
9710 System Assurance Guide
MR0012J
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