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907-0601-00 Rev. C
Model 907 Video/Data Multiplexer – User's Guide
3.5 907-GEM Multiplexer Motherboard
The 907-GEM is an expandable Gigabit Ethernet (GbE) multiplexer motherboard that supports four
completely independent and "switchless" 10/100/1000 Mbps Ethernet links and up to six expansion cards via
the PC/104 backplane data ports. The four copper ports of 10/100/1000 Mbps Ethernet traffic and the
backplane data from the expansion cards are transmitted over a bidirectional optical link via an on-board SFP
optical transceiver.
The 907-GEM card allows the use of non-standard frames often used by multibeam sonars (e.g. Reson 7125)
and other proprietary data links that require simultaneous yet dedicated point-to-point "switchless"
connections over fiber. The 907-GEM also supports jumbo frames, suitable for GigE Vision applications.
Because of the "switchless" design, the 907-GEM provides lower latency than standard Ethernet Switches.
The 907-GEM 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. The SFP transceiver used
in this card can support high optical data rates of up 3.125 Gbaud. Typically optical budgets are 20 dB or
greater. In higher budget systems a minimum of 5 dB attenuation is recommended for bench testing to ensure
receivers are not saturated. A wide range of optical options are available for the 907-GEM, including CWDM
wavelengths for optical multiplexing with other media converters and multiplexers. Please refer to
configuration drawing 907-2056-00 for more information.
Figure 3-17: Model 907-GEM Multiplexer Motherboard
Auto-negotiation is supported at all three speeds, but can be bypassed if connecting to another device which
does not support auto-negotiation. MDI/MDX crossover handling is also supported on the RJ-45 ports. Note
that any packets that cause the input buffers to overflow are simply discarded, i.e. there is no flow control.
Focal Technologies Corp.
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