Black Box ServSwitch manual Bus topology

MATRIX SERVSWITCH™

3.4.2TOPOLOGIES

IMPORTANT NOTE

A standard Matrix ServSwitch system can support two independent users, but each of the user stations has to be attached to a different- numbered KVM port (one to KVM 1, the other to KVM 2), even if the stations are attached to different Switches. If you have users on stations attached to same-numbered ports (both on KVM 1, for instance), the users will share a video bus. Refer to Section 5.3.

Figure 3-3 below and Figure 3-4 on the following page show the two main topologies (patterns) in which you can interconnect Matrix ServSwitches: bus and ring. (The arrows in the figures indicate video-signal directions from output to input.) Which of these topologies you use will depend on where your users are, as explained in the following paragraphs.

Unit 3:

CPUs 33 to 48

Unit 2:

CPUs 17 to 32

Unit 1:

CPUs 1 to 16

Cable runs from OUT on

Unit 3 to IN on Unit 2

Cable runs from OUT on

Unit 2 to IN on Unit 1

User B (KVM 2)

User A (KVM 1)

Figure 3-3. The bus topology.

Use a bus arrangement if all of your users are on a Switch at the end of the chain. In this topology, the OUT ports of all Switches except the first one are attached to the IN ports of the previous Switch in the chain. (The first Switch is the end of the video-signal path, where the user-station monitors are.) The bus topology is also useful if your users are on different Switches but you want to restrict a user’s access to certain CPUs. For example, if a user were on Unit 2 in Figure 3-3, they would only be able to switch to CPUs on Units 2 and 3; they would not be able to switch to CPUs on Unit 1.

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