Grass Valley DD35 Family v.3.1.5 - Manual (Page 487)

5. Application Notes DD35 Production Switcher
5 – 1 Operating Instructions – Rev. 16 / 10.2001
5. APPLICATION NOTES
5.1 SIMULCAST
5.1.1 GENERAL
The Simulcast Mode is designed to make the control unit of DD35 or HD35 also
control a second mainframe (Slave) beside the selected mainframe (Master). It is
the aim to produce a SDTV transmission as far as possible synchronously also in
HDTV.
Application is for instance a DD35 mainframe (MF) with connected control panel
(CP) as well as an HD35 with connected control panel.
Control Panel
Slave only
Master only
Control Panel
Slave only
Master only
HD
Mainframe
Substab
DD
Mainframe
Muster
control Muster
control
Slave
control
Simulcast
UC
UC
UpConvert
Video Inputs
PGM
PST
Video Inputs
Figure 1 Simulcast Application
Each CP has as an additional environment adjustment an IP address for a slave
mainframe. As soon as this IP address is known and the Slave mode is active, the
CP sends all messages being sent to the Master also to the Slave. In addition, the
CP is provided with a Master Only button and a Slave Only button. As long as one
of the buttons is held down, the panel also behaves accordingly.
In each mainframe, a substitution table SUBSTAB can be activated, which has an
effect on all messages switching at inputs on the main crossbar. This enables a dif-
ferent input assignment between Master switcher and Slave switcher.