Level Expansion - pro bel 4408 Technical Manual

4408
3.4

Level expansion

It may be useful in some applications for one card to control the input selection of
other cards to create a multi-level switcher. This mode is called master/slave and
utilises the binary control interconnections.
The master card can be driven from a button panel and all other cards by binary
addressing using only the lower expansion connectors PL8-PL9 on the front of the
card.
AUDIO LEVEL 1
INPUTS 1 TO 8
CONTROL
INPUTS
1 TO 8
AUDIO LEVEL 2
INPUTS 1 TO 8
AUDIO LEVEL 3
INPUTS 1 TO 8
In this example of a synchronous three level audio switcher, both address and
control/audio expansion bus connectors are used. It may be desirable to distribute a
vertical interval trigger signal from an external card to ensure switching during the
correct line of a reference video field. This is why the aud/cntl ribbon is used.
However, the AUD expansion jumpers PL4 and PL5 must be off on all cards.
Technical Manual
PL8
8 X 1
PL6 64x1
OFF
PL3 MODE
BUTTON
PL9
PL8
8 X 1
PL6 64x1
OFF
PL3 MODE
BIN
PL9
PL8
8 X 1
PL6 64x1
OFF
PL3 MODE
BIN
PL9
Example of level expansion:
synchronous three level audio 8x1 switcher
Digital Audio 8x1 Switch
VERTICAL PULSE
FROM VIDEO MODULE
PL6
AUDIO LEVEL 1
PL4,5: OFF
EXPANSION
PL11,14: OFF
CONFIG
PL12,13: ON
PL7
PL6
AUDIO LEVEL 2
PL4,5: OFF
EXPANSION
PL11,14: OFF
CONFIG
PL12,13: ON
PL7
PL6
AUDIO LEVEL 3
ONLY CONTROL
MODE JUMPER,
EXPANSION
PL3 MUST BE
CONFIG
SET ON
LAST CARD
PL7
OUTPUT
OUTPUT
OUTPUT
17