Specifications

29
CHAPTER 3: Installation
Figure 3-5 shows a full-blown cascaded system, including some of the group
numbering. Note that unless the distribution of CPUs at your site would seem to
require it, we don’t advocate creating a new layer of cascaded Duos/Quadros until
the layer above it is filled.
Figure 3-6 on the following two pages shows a sophisticated Quadro cascade that
uses Duo Extenders to cross-link subsidiaries attached to different masters.
Figure 3-5. A more complex cascaded system.
Group 22 (CPU
ports 3 and 4)
Group 21 (CPU
ports 1 and 2)
Master Duo
(cascade layer 1)
Duo Extender
Layer
2
Duos
Layer
3
Duos
Layer
4
Duos
Local users on
user ports 1
and 2
CPUs
CPUs
CPUs
Remote
user on
user port 1
The user on user
port 2 and the
active user on
user port 1 can
simultaneously
access all CPUs
The local and
remote users
on user port 1
share access
on a timeout
basis
CPUs