I/O Adapters and Controllers 315
I/O Adapters and Controllers
The #9728 controls Ultra, Fast Wide, and Fast Narrow SCSI disk units. The Ultra SCSI disks
provide the best performance when attached to the #9728. These Ultra SCSI disks are
17.54G Disk Unit #6824, 8.58G Disk Unit #6813, 4.19G Disk Unit #6807, 1.96G Disk Unit
#6806, and their base disk equivalents and the #1334 (17.54G), #1333 (8.58G), #1337
(4.19G), and #1336 (1.96G) Disk Unit Migration Kits. The #9728 also controls migrated disks
that are not Ultra SCSI. In that case, the disks do not perform at Ultra SCSI speeds.
The Base PCI Disk Unit Controller supports a maximum of five one- or two-byte disk units. It
is represented in the rack configuration list as CCIN 2728. The #9728 is supported for
migration only.
Migration Tower SPD Hardware
#2699/#9699 SPD Two-Line WAN IOA
The #2699 supports up to two multiple protocol communications ports, where one or two (in
any combination) of the cable features shown in the following table are attached.
These functions do not have an equivalent function on the #2699 IOA:
• ASCII Adapter
• V.25 Autocall cable
• Select standby mode
• X.21 switched WAN dialup or short-hold mode WAN
• Asynchronous communication speeds of less than 300 bps
• Data Rate Select signal on the EIA 232/V.24 interface. This function is used by some
older 2400 bps modems to reduce the speed to 1200 bps.
• LPDA-1 (Link Problem Determination Aids). This is a diagnostic function supported by
some (primarily older IBM) modems.
• V.54 local and remote loop back (diagnostics functions supported by some modems)
Cable Length
Attachment
EIA232/V.24 V.35 EIA449/V.36 X.21
20ft/6m #0330 #0338 #0335 #0341
50ft/15m #0331 #0339 #0336 #0342
80ft/24m N/A #0340 N/A N/A
150ft/45m N/A N/A #0337 N/A
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