Technical information

2.2.2 KFQSA Storage Adapter

The KFQSA is an intelligent storage adapter that allows Q22-bus systems

to communicate with storage peripherals based on the Digital Storage

Systems Interconnect (DSSI).

Functional Information

Controller protocol SSP: to and from Q22-bus host

DSSI: to and from ISEs

Supported drive RF-series ISEs

Drives per adapter 7

Drive interconnect Direct

Controllers per system 2 maximum

Ordering Information

KFQSA–SG RF-series ISE adapter, controls up to a maximum

of 7 RF-series ISEs

Performance

Peak transfer rate 4 Mbytes/second

Sustained transfer rate 1.5 Mbytes/second

I/O request throughput 190 I/O requests/second (single-sector reads)

Error detection DSSI bus parity and check character, all

transmissions

Conﬁguration Information

Form factor Quad height

Power requirements +5 Vdc, 5.5 A (typ)

Power consumption 27.5 W

Bus loads 4.4 ac; 0.5 dc