Storagetek 9710 User Manual download pdf (Page 37)

MR0012J 9710 System Assurance Guide 3-9

Data Interfaces

■ Data Interfaces

Refer to the 9840 Tape Drive System Assurance Guide, MT 5003, for 9840 data

interface information.

The LSM has three data interfaces available:

• Small Computer System Interface (SCSI) for all drives

• Federal Information Processing Standard (FIPS) interface for 4890s

• Fibre Channel for 9840s

4890 Data Buses

You may order FIPS bus drives, SCSI bus drives, or both. FIPS and SCSI are not

available on the same drive.

Two FIPS data bus terminal blocks are present on a drive. Each bus in this

definition includes the Data In, Data Out, Tag In, and Tag Out lines. You can

use the two terminals for two data buses, use only one terminal block and

terminate the other, or use the second terminal block for daisy chaining.

Note: The AS/400 I/O port does not allow daisy chaining of the 4890 Drives.

Each SCSI drive has two SCSI data bus connectors. You may use only one SCSI

data bus input per drive. The other connector must be terminated, or it can be

used for daisy chaining in a non-AS/400 environment, but it cannot be used for

a second data bus.

DLT Data Buses

Each DLT has two SCSI data bus connectors. You can use only one SCSI data

bus input per drive. The other connector must be terminated, or it can be used

for daisy chaining, but it cannot be used for a second data bus.

■ I/O Cabling Limits

Examine Figure 3-7 on page 3-11 and Figure 3-8 on page 3-12 while you read

the following discussion.

Only one SCSI control line can exist. The other SCSI port, on both the SCSI card

and the I/O tower, is reserved for daisy chaining; it should be terminated on the

SCSI control interface card.

Two RS423/RS232 control lines can exist on the I/O tower. Each control may be

connected to a separate AS/400.

Six FIPS data buses can exist on the I/O tower. Each bus in this definition

includes the Data In, Data Out, Tag In, and Tag Out lines. If you are using two-

bus FIPS drives, each connected at the I/O tower to two FIPS buses, then no

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Storagetek 9710 User Manual Page 37