26
SERVMANAGERS
• If you use coaxial cables, the maximum recommended distance from the
ServManager to the attached monitor, keyboard, and mouse is 20 ft.
(6.1 m) with typical monitors and video resolutions, but see the first
Caution notice on page 19. For typical CPUs, this is also the maximum
recommended distance from any submaster to any attached CPU.
Depending on your application, this distance might vary; see
Section 4.1.3
.
• The distance between any ServManager and any submaster plugged into
one of its ports must not exceed 20 ft. (6.1 m) of original Serv cable. For
coaxial cable, the maximum recommended distance is 20 ft. (6.1 m), but
see the first Caution notice on page 19.
• The total number of CPU ports accessible by any ServManager master
unit must not exceed 256.
• You must not use older (“-R2” product code or earlier) 2- or 4-port
(SW721 or SW722 model) ServSwitches as submasters. Their cascading
logic and command language is different from that of all other Serv type
units.
• You must not cascade submasters to more than one “layer.” That is, you
may connect submasters to the CPU ports of one or two ServManagers,
but do not connect any submasters to
submasters’
CPU ports. To illustrate
this restriction, let’s say you’ve installed a four-port submaster on a four-
port ServManager and you have a four-port submaster yet to install. You
must install the second submaster on the ServManager’s CPU 2 port, not
on the first submaster’s CPU 1 port. A third submaster would have to go
on the ServManager’s CPU 3 port, a fourth on the CPU 4 port. If it
becomes necessary to attach more CPUs after “maxing out” on
submasters, you must upgrade your ServManager or submasters.
• If you are attaching more than one submaster to a master ServManager,
we strongly recommend that all of the submasters have the same number
of ports. This is because the ServManager’s Width command/
parameter—the value it uses to calculate how many ports each attached
submaster has (see
Section 4.3.9
)—is
global
rather than
port-specific
. In
other words, a master ServManager always excpects
every
submaster
attached to it to have the number of ports specified in Width.
Summary of Contents for ServManager SW995A-R2
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