907Plus Multiplexer Motherboard - Focal 907 User Manual

907-0601-00 Rev. C Model 907 Video/Data Multiplexer – User's Guide
3.3

907Plus Multiplexer Motherboard

The 907Plus (907+) multiplexer motherboard supports four unidirectional video channels, six dedicated
bidirectional serial channels (4 x RS-232, 2 x RS-485), and up to six expansion cards via the PC/104 data
ports. The six on-board serial channels are always available and are not disabled by adding expansion cards.
The 907Plus motherboard uses a small form-factor pluggable (SFP) optical transceiver for quick and reliable
configuration of optics and an array of board-edge LEDs for diagnostic purposes. Both uplink and downlink
run at 1200 Mbaud with various wavelength options available. Typical optical power budgets are 20 dB or
greater. In higher budget systems, a minimum of 5 dB attenuation is recommended for bench testing to
ensure the receivers are not saturated. The 907Plus is recommended for singlemode operation only, although
short multimode links (< 500 m) are possible.
Switches on the board set the signal format of the four video channels and the two RS-485 channels. The four
on-board RS-232 channels do not require configuration. By default, the card is configured for four channels of
NTSC/PAL composite video signals, however the system can be configured to support one RGB channel and
one composite channel, two Y/C (S-Video) channels, or one YPrPb and one composite channel. The two
on-board RS-485 channels can also be configured to operate as a single RS-422 channel and may be used
with or without a transmission timeout. Detailed video and data settings are described by the configuration
drawings 907-2035-00 (907+R) and 907-2036-00 (907+C).
Each of the RS-485 channels (CH1 & CH2) is galvanically isolated, data and power, from all other channels
and from the main board ground, which is the +5 V power ground. The RS-232 channels are isolated in pairs,
with channels 3 and 4 sharing a common isolated ground and channels 5 and 6 sharing a different isolated
ground. The video channels all share a common ground, which is connected to the on-board power ground.
If isolation is required for the video channels, a high quality video isolation transformer is recommended.
The 907Plus remote is available in pressure tolerant versions with 6000 psi rating.
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