27
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Appendix
●
Jumper Connector Positions for Cage Extension
Examples of jumper connector settings are shown below.
Note: If the system is smaller than 1 024 inputs times 128 outputs, the settings (factory default) may not need to be
changed for extensions.
2
4
6
8
10
1
5
7
9
75
Ω
75
Ω
Clamping
Circuit
VIDEO IN
VIDEO OUT
2
4
6
8
1
5
3
3
7
10
9
75
Ω
75
Ω
Clamping
Circuit
VIDEO IN
VIDEO OUT
2
4
6
8
1
3
5
7
10
9
75
Ω
75
Ω
Clamping
Circuit
VIDEO IN
VIDEO OUT
Crosspoint input for 1 channel
75
Ω
input, Buffered through, Clamp ON
75
Ω
input, Buffered through, Clamp OFF
HI-Z input, Wired through, Clamp off
Initial-stage cage: (example MXSW 1-1, 1-2
and 1-3)
• Video input is received at the input circuit terminat-
ed at 75
Ω
.
• The through circuit used to transfer the same input
signal to another cage is buffered in this cage
before 75
Ω
transmission.
• The signal output is clamped before sending it out
to the board circuit to adjust the black level to that of
another input signal.
•
The above are the factory default settings.
Middle-stage cage: Other than the initial and
final stages
• No clamping circuit is required because the signal
input has already been clamped at the initial stage
and buffered by the DC amplifier.
• To transfer the same input signal to the next-stage
cage, position the jumper connectors for wired loop-
through. With a wired system, a failure of the power
supply to the middle-stage cage would not cause
any problem in the successive stages.
Note:
If the video output is 65 or more, this middle-
stage cage may need further extension.
Final-stage cage: (example MXSW 4-1, 4-2 and
4-3)
• In the final stage, the signal sent from the initial
stage is matched to 75
Ω
. The video signal therefore
is received at the input circuit terminated at 75
Ω
.
• No clamping is required here because the signal
input is already clamped as in the middle stage.
• The output signal for monitoring and other equip-
ment is buffered through.
