Unpacking And Inspection; Cabling And Connectors; Cabling Considerations; Electrical Characteristics - Seagate STD124000N Product Manual

Chapter 3

Unpacking and Inspection

Cabling and Connectors

Cabling Considerations

Electrical Characteristics

Page 16
Although 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 and 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 Seagate
representative.
3. Always save the containers and packing materials for any future reshipment.
The Scorpion 24 drive provides a standard single-ended SCSI interface. ANSI SCSI
standards specify the technical requirements for correctly cabling and connecting
single-ended devices. This section provides some basic information about SCSI
cabling and connectors for the drives.
You can use either a 50-pin flat cable or a 25-signal twisted-pair cable with a
maximum length of 6 meters (19 feet) to connect the 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 be between 90 ohms and 140 ohms. A
cable characteristic impedance of greater than 100 ohms is recommended.
To minimize noise and ensure even distribution of terminator power, the minimum
recommended conductor size is 28 AWG (0.08042 mm
This section lists measurements of various electrical signals in relation to the single-
ended SCSI connection. For these measurements, SCSI bus termination is
assumed to be external to the SCSI device.
Installation
2 ).
DAT Drives