31
CHAPTER 3: Installation
• If you are attaching more than one submaster to a slimline or full-size master
ServSwitch Ultra, we strongly recommend that all of the submasters have the
same number of ports. This is because the Switch’s “Expansion width”
command/parameter—the value it uses to calculate how many ports each
attached submaster has (see
Section 5.2.5
)—is
global
rather than
submaster-
specific
. In other words, a master ServSwitch Ultra always expects every
submaster attached to it to have the number of ports specified in Width.
For example, if you attach one 8-port submaster and one 12-port submaster
to a master ServSwitch Ultra, and then set Width to 8 (and Units to 2 and Max
Ports to 20—see
Sections 5.2.3
and
5.2.4
), you will be unable to scan or switch
to the upper 4 ports on the 12-port submaster—the Switch has no way of
knowing they are even there. On the other hand, if you set Width to 12 (and
Units to 2 and Max Ports to 24), your system will include 4 “phantom” ports
(nonexistent ports 9 through 12 on the 8-port submaster) that the master will
think are there and will try to scan or switch to, displaying a blank screen.
Figure 3-3. Cascading with Matrix ServSwitch submasters.
4
3
2
1
SUBMASTER MATRIX
SERVSWITCH 2
ADAPTER CABLES
CPU 4
CPU 3
CPU 2
CPU 1
CPU 9 (A)
through
CPU 14 (A)
4
3
2
1
SUBMASTER MATRIX
SERVSWITCH 1
MONITOR
KEYBOARD
MOUSE
CPU1
CPU3
CPU2
CPU4
RS-232
POWER
17VAC CT
MONITOR/KEYBOARD/MOUSE A
MONITOR/KEYBOARD/MOUSE B
CPU1
CPU3
CPU2
CPU4
RS-232
POWER
17VAC CT
MONITOR/KEYBOARD/MOUSE A
MONITOR/KEYBOARD/MOUSE B
MONITOR
KEYBOARD
MOUSE
CPU 9 (B)
through
CPU 14 (B)
CPU 8
CPU 7
CPU 6
CPU 5
2
1
2
1
3-8
3-8
B
A
B
A
RS-232
POWER
17VAC CT
CPU 5
CPU 1
CPU 2
CPU 8
CPU 7
CPU 3
CPU 4
CPU 6
MONITOR/KEYBOARD/MOUSE
RS-232
POWER
17VAC CT
CPU 5
CPU 1
CPU 2
CPU 8
CPU 7
CPU 3
CPU 4
CPU 6
MONITOR/KEYBOARD/MOUSE
CPU
SS to SS
MKM
MASTER SERVSWITCH A
MASTER SERVSWITCH B
Max. Ports = 14
Width = 4
Units = 2
Max. Ports = 14
Width = 4
Units = 2