Connecting Internal Scsi Devices - Adaptec AHA-2740W Installation Manual

2740w-ig.doc Black 10
AHA-2740W/2742W/2744W
The AHA-2740W/2742W/2744W can accommodate a
single SCSI bus with up to a total of 15 SCSI devices
connected.
Note:
Only single-ended SCSI devices are supported by
the AHA-2740W/2742W host adapters and only differential
SCSI devices are supported by the AHA-2744W host
adapter. Differential SCSI devices may be damaged if con-
nected to the single-ended SCSI host adapter bus;
similarly, single-ended SCSI devices may be damaged if con-
nected to differential host adapters. Most SCSI devices
currently produced are single-ended SCSI devices. Consult
your SCSI device user documentation.

Connecting Internal SCSI Devices

Internal devices are usually connected to the host
adapter by a flat SCSI ribbon cable. This cable has con-
nectors at each end and additional connectors attached
in the middle. One end of the cable is attached to the
internal connector on the host adapter, and the SCSI
devices are attached to the remaining connectors. The
50-pin internal connector uses a 50-pin SCSI ribbon
cable with a 50-pin header internal connector. The 68-pin
internal connector uses a 68-pin SCSI ribbon cable with
a 68-pin high-density SCSI internal connector.
Up to 7 internal 8-bit devices can be connected to the
50-pin internal connector, and up to 15 internal 16-bit
10