Technical data

4.4.1 Guidelines for Connecting Expansion Boxes

Use the following guidelines when connecting expansion boxes:

• The recommended maximum length of the SCSI cables (internal length

plus external length) is 19.6 feet (6 metres).

• Each device in the expansion boxes and the system box must have a unique

SCSI ID.

• You must attach the 50-pin terminator that comes with the expansion box

to an unused SCSI connector on the back of an expansion box.

• Plug the expansion boxes into the same grounded power strip or electrical

circuit as the system.

• Do not connect more than two tape drive devices.

Caution

– Some expansion boxes are restricted to either 110 V ac or 220

V ac operation. Make sure that the voltage requirement of the

expansion box used is compatible with the supply voltage.

– Turn on the expansion boxes before you turn on the system

unit. This procedure ensures that the device in each expansion

box is ready for use and that the system ﬁrmware includes the

device in the conﬁguration display.

– Do not connect or disconnect SCSI expansion boxes while

the system is turned on. Doing so can cause damage to the

equipment or corrupt data.

– Digital cannot guarantee the correct operation of any SCSI

bus that uses cable assemblies not supplied by Digital or not

conﬁgured in accordance with these guidelines.

Hardware Options 4–5