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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.
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