907-0601-00 Rev. C Model 907 Video/Data Multiplexer – User’s Guide
Focal Technologies Corp. Page 3-2
3.1 Standard 907 Multiplexer Motherboard
The 907 motherboard multiplexes three unidirectional (typically remote to console) video channels, and six
bidirectional serial data channels (four RS-232 and two high-speed RS-485/422). Each video channel
provides 5.5 MHz bandwidth for NTSC and PAL composite signals, S-video (Y/C), and RGB formats.
Typically all three video channels are set for 8-bit video resolution, but they can be switch configured for two
10-bit channels. Refer to the configuration drawing 907-2001-00 for details.
Each of the two RS-422/RS-485 data channels support NRZ rates up to 2.5 Mbaud, and each of the four RS-
232 channels support up to 120 Kbaud. The RS-422/RS-485 channels 5 and 6 can be configured for simplex
or duplex communication, and the user can enable autosense on these channels for RS-485 traffic.
In addition, these two channels, which are default configured for RS-485 with autosense, can be configured
instead for TTL formatted data or a configuration suitable for AC-coupled RS-485, such as used by a Kraft
manipulator telemetry links.
Figure 3-2 shows a standard Model 907 multiplexer motherboard with an external wavelength division
multiplexer (WDM) and Figure 3-3 shows the input/output (I/O) channels for the standard Model 907-R and
907-C multiplexer cards.
Figure 3-2: Standard Model 907 Multiplexer Motherboard with WDM
OPTICAL CABLE SYSTEM
VIDEO IN
RS-232
CH1
VIDEO INCH2
VIDEO INCH3
CH1
RS-232CH2
RS-232CH3
RS-232CH4
REMOTE
(907-R)
RS-485/422/TTLCH5
RS-485/422CH6
DATA
CONN
A
DATA
CONN
B
DATA
CONN
C
VIDEO OUT
RS-232
CH1
VIDEO OUT CH2
VIDEO OUT CH3
CH1
RS-232 CH2
RS-232 CH3
RS-232 CH4
CONSOLE
(907-C)
RS-485/422/TTL CH5
RS-485/422 CH6
DATA
CONN
A
DATA
CONN
B
DATA
CONN
C
Figure 3-3: On board I/O Channels for 907-R and 907-C Multiplexer Motherboard Cards
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