Adaptec AHA-2742T User Manual - Page 42

Connecting Peripherals

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Getting Started Connecting Peripherals Up to seven SCSI devices can be connected to the internal and external connectors on the AHA-2740/2742. Up to two floppy diskette drives can be connected to the floppy connector on the AHA2742/2742T. Always refer to the manufacturer's documentation before connecting and installing your SCSI device(s) and/or floppy diskette drive(s). Note Only Single-Ended SCSI devices are supported by the host adapter. Differential SCSI devices may be damaged if connected to the host adapter bus. Most SCSI devices currently produced are Single-Ended SCSI devices. Consult your SCSI device user documentation to verify that your SCSI device is a Single-Ended SCSI device. SCSI Devices SCSI devices are either internal SCSI devices or external SCSI devices. Internal SCSI devices usually have only a single connector and can only be cabled to the internal connector on the host adapter. External SCSI devices usually have two connectors and can be cabled to either the external connector on the host adapter or to the external connector of another external SCSI device. SCSI devices are cabled together in a single continuous daisy-chain of devices. This chain may have no branches, but must run from device to device in a continuous series. If your host adapter includes both internal and external SCSI devices, the host adapter will be at the junction between the internal and external devices. The AHA-2740/2742 has a single-channel, SCSI Channel A, that can accommodate a SCSI bus with up to seven SCSI devices connected. The AHA-2740T/2742T uses Adaptec's TwinChannel architecture and has two channels, SCSI Channel A and SCSI Channel B, that can each accommodate a SCSI bus with up to seven SCSI devices connected. SCSI Channel A is comprised of both an internal and external connector, while SCSI Channel B is comprised of only an internal 2-15 Adaptec AHA-2740 Series User's Manual Stock Number: 510381-00 / Rev. C (Page 2-15) Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 ECN Date: 9/14/93

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Connecting Peripherals
Up to seven SCSI devices can be connected to the internal and
external connectors on the AHA-2740/2742. Up to two floppy disk-
ette drives can be connected to the floppy connector on the AHA-
2742/2742T.
Always
refer to the manufacturer’s documentation
before connecting and installing your SCSI device(s) and/or floppy
diskette drive(s).
Note
Only
Single-Ended
SCSI devices are supported by the host
adapter.
Differential
SCSI devices may be damaged if con-
nected to the host adapter bus. Most SCSI devices currently
produced are
Single-Ended
SCSI devices. Consult your SCSI
device user documentation to verify that your SCSI device is a
Single-Ended
SCSI device.
SCSI Devices
SCSI devices are either internal SCSI devices or external SCSI
devices. Internal SCSI devices usually have only a single connec-
tor and can only be cabled to the internal connector on the host
adapter. External SCSI devices usually have two connectors and
can be cabled to either the external connector on the host adapter
or to the external connector of another external SCSI device.
SCSI devices are cabled together in a single continuous
daisy-chain
of devices. This chain may have no branches, but must run from
device to device in a continuous series. If your host adapter includes
both internal and external SCSI devices, the host adapter will be at
the junction between the internal and external devices.
The AHA-2740/2742 has a single-channel, SCSI Channel A, that
can accommodate a SCSI bus with up to seven SCSI devices con-
nected. The AHA-2740T/2742T uses Adaptec’s TwinChannel
architecture and has two channels, SCSI Channel A and SCSI
Channel B, that can each accommodate a SCSI bus with up to
seven SCSI devices connected.
SCSI Channel A is comprised of both an internal and external
connector, while SCSI Channel B is comprised of only an internal
Adaptec AHA-2740 Series User’s Manual
Stock Number:
510381-00
/
Rev. C
(Page 2-15)
Print Spec Number:
491709-00 Rev C
Current Date:
9/1/93
ECN Date:
9/14/93
Getting Started
2-15