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903-0623-00 Rev. A
Model 903 User's Guide, FMB-X-2.5 Version
Figure 4.1-3: VIB-X Plan View
Fuses on the rails from the backplane provide over-current protection near the 96-pin DIN 41612
connector at the back of the card, per Figure 4.1-3. Fuse F1 is a 3A fuse on the +5 V supply rail and fuse
F2 is a 1A fuse on the -12 V rail, which is used to generate -5 V on the board. These fuses are soldered
in place and are not intended to be field replaceable, as any over-current fault sufficient to blow a fuse
can potentially damage the VIB-X card. Cards with blown backplane fuses should be returned to Focal for
assessment.
The sync status of each video channel is represented by the sync LEDs on the corresponding FMB-X-2.5
modules. Furthermore, for 903 systems that have both the FMB-X-2.5 and backplane -X cards, the
diagnostics software at the surface can monitor the status of the remote VIB-X card, including input
voltage overload flags, current video format configuration, and card assembly information, such as serial
number. A black and white bar test pattern is also available on the VIB-X at either the remote or the
console through the diagnostic software (command mode). This test pattern is generated in the FPGA
and at the remote end this test pattern can be output at the front panel as well as to the backplane, and at
the console end the test pattern can be only output to the front panel. Refer to FMB-X-2.5 diagnostics
manual (P/N 903-0622-00) for more details.
Note that VIB-X cards do not support "non-video" signals on channel 4, as with older VIB-TX and
VIB-RX cards. Typically the "non-video" signals were audio or special high speed sonar signals,
which are now handled by other card types. Please consult Focal for any non-standard video
signals or switched video configurations.
Focal Technologies Corp.
Page 4-4
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