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ARCHIVE PYTHON DDS-DC OAT DRIVES---PRODUCT DESCRIPTION MANUAL
3.3 Unpacking and Inspection
Although Python drives are inspected and carefully packaged at the factory, damage may occur during
shipping. Follow these steps for unpacking the drive.
1.
Visually inspect the shipping containers; notify your carrier immediately of any damage.
2.
Place shipping containers on a flat, clean, stable surface; then, carefully remove and verify the
contents against the packing list.
If parts are missing or the equipment is damaged, notify your Archive representative.
3.
Save the containers and packing materials for any future reshipment.
3.4 Cabling and Connectors
The Python DDS-DC drives provide standard single-ended SCSI transmission.
ANSI SCSI standards
specify the technical requirements for correctly cabling and connecting single-ended devices. This section
provides infonnation about SCSI cabling and connectors for the 4322, 4542, and 4352 drives.
Refer to Sections 3.5 and 3.6 for actual installation instructions.
3.4.1 Cabling Considerations
Either 50-pin flat cable or 25-signal twisted-pair cable with a maximum length of 6 meters (19 feet) may be
used to connect the Python drives to the SCSI host adapter output. If twisted-pair cabling is used, connect
the twisted pairs to physically opposing contacts on the connector.
A stub length no greater than 0.1 meter should be used off the mainline connection within any connected
equipment.
The cable characteristic impedance should not be less than 90 ohms nor greater than 140 ohms. A cable
characteristic impedance of greater than 100 ohms is recommended.
To minimize noise and ensure even distribution of tenninator power, the minimum recommended conductor
size is 28 A WG (0.08042 mm
2).
3.4.2 Electrical Characteristics
This section lists measurements of various electrical signals in relation to the single-ended SCSI connection.
For these measurements, SCSI bus tennination is assumed to be external to the SCSI device.
3-2
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