Dssi Connector (Dssi Bus 0) - DEC VAX 4000 300 Manual

CPU. These plugs are configured at the factory. For single-host
systems, Bus 0 is identified as bus node 6, bus 1 is identified as
bus node 7; for dual-host systems, both busses on the first host
are identified as bus node 7, and both busses on the second host
are identified as bus node 6.
DSSI connectors (DSSI Bus 1) — Two Digital Storage System
Interconnect (DSSI) connectors, labeled X and Y, on the console
module allow you to expand your system by connecting additional
mass storage devices to the second DSSI bus.
Ethernet connectors — The console module has two Ethernet
connectors: a BNC-type connector for ThinWire Ethernet, and
a 15-pin connector for a standard Ethernet transceiver cable.
The Ethernet connector switch allows you to set the type of
connection. To use the standard transceiver cable connection,
set the switch to the up position. To use the ThinWire cable
connection, set the switch to the down position. A green indicator
light (LED) for each connector indicates which connection is
active.

1.1.1.4 DSSI Connector (DSSI Bus 0)

To the left of the card cage is the DSSI connector for DSSI Bus 0. Bus 0
provides the DSSI bus for DSSI devices installed in the system enclosure.
The connector allows you to expand your system by connecting additional
mass storage devices to the bus. You can also share mass storage devices
with a second system by forming a dual-host configuration. Figure 1–9
shows the location of the DSSI connector for DSSI Bus 0.
1–14 VAX 4000 Model 300 Operation