Black Box KV6104SA-R2, Manual

Page: 43 / 98

42
SERVSWITCH™ DUO AND SERVSWITCH™ QUADRO
4.6.2 C
REATING
E
NTRIES FOR
C
OMPUTERS
A
TTACHED TO A
C
ASCADED
D
UO
/Q
UADRO
S
YSTEM
As described in Section 3.4.3 , you can cascade ServSwitch Duos/Quadros using
one, two, three, or four KVM-cable links. Ideally, you should run two cable links
from each higher-level Duo or Quadro to each of the Duos cascaded from its CPU
ports, or four cable links from each higher-level Quadro to each of the Quadros
cascaded from its CPU ports, so that as many of the system’s users as possible can
simultaneously reach any of the system’s CPU ports.
Each computer name that you add to the Duo’s/Quadro’s on-screen menu has
an associated port number that tells the ServSwitch Duo/Quadro system where to
find the computer. Port numbers for computers attached to a single Duo/Quadro
are simply the number of the CPU port that the computer is attached to. Port
numbers for computers connected to cascaded Duos/Quadros are derived by
stringing together the “port routing” (that is, the numbers of the CPU ports that
the Duo/Quadro system has to switch through to get from the user station to the
computer).
Figure 4-1 on the next page shows how port numbers are constructed and how
the physical layout of a cascaded system relates to entries in the on-screen menu.
The illustrated configuration is not one we’d recommend for an actual installation,
but it’s useful for showing how the numbering system works. If you make two,
three, or four cascade links between a pair of Duos/Quadros, they must be
connected to the groups of consecutive CPU ports on the higher-level Duo/
Quadro that are listed in Figure 3-4 in
Section 3.4.3 . As that figure shows, these
ports have associated group numbers. The ServSwitch Duo/Quadro uses this
group number to connect users to the first available port in that group. For
example, group number 21 consists of CPU ports 1 and 2. If these ports are linked
to a subsidiary ServSwitch Duo, and two users both try to connect to computers
that are attached to that Duo, the system will allocate the cascade links to those
users on a first come, first served basis.
If you make only a single cable link between a CPU port on a higher-level
Duo/Quadro and a user port on a subsidiary Duo/Quadro, one user will be able to
freely switch to the CPUs directly or indirectly attached to that subsidiary Duo/
Quadro. But if another user tries to connect to those CPUs, they’ll get a message
saying that no cascade links are available. They won’t be able to connect to the
subsidiary Duo’s/Quadro’s CPUs until the other user switches elsewhere and
relinquishes that cascade link.