Specifications
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Features Descriptions
*Option Part Number* *KFQSA-M*
*Spare Part Number* M7769-00
*Host Bus* Q-bus
*Device Bus* DSSI
*Number of Devices 7 ISE's
Supported*
*Connector* 1 - 50 Pin
*Form Factor* Quad height
*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
*Power Requirements +5 5.5 A (typical)
Vdc*
*Power Consumption* 27.5 W
*DC Q-bus Load* .5 unit loads
*AC Q-bus Load* 4.4 unit loads
*Data Cable Length* 6 meters max
Description
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The KFQSA is a single module, quad height Q-22 bus to DSSI bus adapter. It
supports up to seven DSSI storage elements and provides the physical link
which permits the DSSI storage device resident port and class servers, under
SCA (System Communication Architecture) to communicate to the host port and
class drivers through as many Q-bus register devices connected to the DSSI
side of the KFQSA. The KFQSA will provide 4 sets of Q-bus registers which
are addressed according to the U/Q class and the classes of devices on the
DSSI bus. It has one 50 pin connector at the handle end of the module with 2
guide keys which connects the DSSI bus. The module also contains an array of
6 red LED's for diagnostic error code reporting and a green OK LED. The
module contains a DIP switch pack with 4 service switches. The service
switches permit setting and choosing a default CSR. The module contains one
replaceable pico fuse (p/n 12-10929-06) which provides terminator power to
the DSSI bus.
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*NOTE: No SCS communication support* KFQSA's do not support SCS
communication over the DSSI bus, they MUST have a NI connection in order to
run the cluster software.
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