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Q1601 & Q1602 System Manual
V1.64
17
Q1602 Cascade
This allows a maximum router size of 128x2 to be built. In the example below a 48x2
router can be built from four 16x2 routers.
Q1602
OUT
J1
Q1602
OUT
J1
Q1602
OUT
J1
Q1602
OUT
J1
Q1602 Cascade Example
Inputs
1-16
Inputs
17-32
Inputs
33-48
Output 1
Output 2
The J1 connector from the first upstream router is connected to the Input 16 of the
downstream router. The J1 connector from the second upstream router is connected to
the Input 15 of the downstream router and so on.
Cascade Control
From a control point of view it is necessary to install the
Advanced Controller
module in
the downstream router. This unit then connects to the Q-link just like any other Quartz
router, communicating to the other routers and remote control panels.
The downstream router sends commands in parallel digital form through a cable
connected to the CONTROL connector, which is daisy-chained to the upstream routers.
When commands are received from the control panels they are processed in the
Advanced Controller
in the downstream router. It then sends commands to its own
crosspoints to make a new route selection, but simultaneously sends commands out of
the CONTROL connector to the upstream routers. If a new route selection requires a
source from a different upstream router from that currently selected then a command is
sent through the CONTROL connector to all the upstream routers, which switch in
tandem to the new input at the same time as the downstream router.
This technique is applicable to video, audio and audio-follow-video mixed routers. The
only limitation to this is that the levels on the second destination are always married.
Note that the analogue video router takes its switching reference point from the signal on
Input 1. It is therefore important in a cascade application that all the inputs of the
upstream router feeding Input 1 of the downstream router have valid video signals,
otherwise video switching will not occur in the vertical blanking interval.