Installation guide

The DSSI buses are conﬁgured physically by the cable. Check your cables

before beginning installation. If you need additional cables, see Table 3–5.

The overall physical bus length is limited. Therefore, systems and devices

on the DSSI bus must reside close to each other. One external DSSI cable is

required for each bus connection between systems; two cables are required

to connect two systems and an SF2xx cabinet.

Table 3–5: KFMSA Options

Option Board P/N Contents

KFMSA-AA T2036-AA The KFMSA adapter with bus termination on the mod-

ule; supports single- and dual-host systems.

KFMSA-BA T2036-BA The KFMSA adapter with removable termination on the mod-

ule; supports single-host when termination is present, or

multi-host when termination is removed.

Table 3–6: DSSI Cable Kits

P/N Qty—Length Function

CK-SF200-LM 1 108" (2.7m)

1 70" (1.8m)

For VAX to SF connections. Contains two ca-

bles (BC21Q-09 and BC21R-5L). One kit is re-

quired for each DSSI bus used (maximum of two

kits per KFMSA).

CK-KFMSA-LJ 2 48" (1.21m) Internal cable set, connecting XMI back-

plane at KFMSA adapter to the I/O bulk-

head on the host system. Used when the

host is the end node of a DSSI subsys-

tem.

CK-KFMSA-LN 2 48" (1.21m) Internal cable set, connecting XMI back-

plane at KFMSA adapter to the I/O bulk-

head on tri-host systems. Used when the

host is not an end node of a DSSI subsys-

tem.

CK-KFMSA-LR 1 120" (3.04m)

1 48" (1.21m)

Internal cable set, connecting TF85 tape con-

troller and the KFMSA XMI backplane connec-

tions to the host I/O bulkhead.

Connecting to a DSSI Subsystem 3–23