Digital Equipment Corporation Storage Works Guía de usuario descargar pdf (Pagina 47)

StorageWorks SCSI Buses

5.3 SBB Shelf SCSI Bus Conﬁgurations

Prior to shipment, the SBB shelf SCSI buses are conﬁgured to meet system

requirements in one of the following ways:

• A single bus with seven device addresses (seven SBBs maximum) on one shelf

• Two buses with four device addresses on one bus (four SBBs maximum) and

three device addresses on the other (three SBBs maximum)

• A single bus with seven device addresses (seven SBBs maximum) on multiple

shelves

A customer can conﬁgure buses provided that the rules listed in the following

sections are strictly observed. For a complete listing of compatible SCSI cables,

see the StorageWorks Family Conﬁguration Guide.

Note

The length of a shelf SCSI bus is the distance from the input connector to

the terminator on the shelf.

Table 5-3 lists the standard factory SCSI bus conﬁgurations and deﬁnes the bus

lengths.

Table 5–3 StorageWorks Bus Lengths

Shelf Bus Input Slot 1 Slot 5 Meters Feet

Single Shelf—Single Bus

1 1 JA1 Terminator Jumper 0.9 2.9

0123456

POWER

CXO-3596B-MC

7-DEVICE BUS INPUT

BUS LENGTH: 0.9 m (34.7 in)

JA1

JB1

(7)

Single Shelf—Two Buses

1 1 JA1 Jumper† Terminator 0.4 1.4

1 2 JB1 Jumper† Terminator 0.6 2.0

23456

POWER

CXO-3597B-MC

3-DEVICE BUS INPUT

4-DEVICE BUS INPUT

BUS LENGTH: 0.4 m (16.4 in)

JA1

JB1

BUS LENGTH: 0.6 m (23.6 in)

(7)

† The jumper is placed here for safekeeping and has no effect on the SCSI bus.

‡ From input connector (JA1) to output connector (JB1)

§ Do not install a terminator here.

(continued on next page)

StorageWorks SCSI Buses 5–5

1 2 ... 42 43 44 45 46 47 48 49 50 51 52 ... 73 74

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Digital Equipment Corporation Storage Works Guía de usuario Pagina 47

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