903-0628-00 Rev. 1
Model 903-HD User's Guide – FMB-X-2.5
Focal Technologies Corp.
Page 4-3
For 4VID and 8VID systems with FMB-X-2.5 and backplane -X cards installed, the diagnostics software at the
surface can monitor the status of the HDB-TX card, including card assembly information, such as serial
number. A black and white bar test pattern is also available on the HDB-TX remote card through the
diagnostic software (command mode). This test pattern is generated in the FPGA and can be output at the
front panel as well as to the backplane. Refer to FMB-X-2.5 diagnostics manual (P/N 903-0622-00) for more
details.
Note: HDB-TX cards shipped before September 2011 (cards with SN < 10022022) only support LED
diagnostics but do not support enhanced diagnostics, which provides card serial number information
and a video test pattern generator.
4.1.2 Data Channels
All eight data channels of the HDB-TX card are accessible via a ribbon cable header, J5, located next to the
video connectors on the PCB. The mating ribbon cable is routed internally to a data input/output board,
typically installed in an I/O-Box located on the bottom of the rack but may also be routed through the slot in
the front panel. Figure 4-2 shows the location of the video (J1-J4), data I/O (J5), AIB plug-in (J6-J13) and
backplane (J16) connectors. Figure 4-3 shows a block diagram of the high density board.
Four dedicated RS-232 channels are provided on the high density motherboard. External connectors and
signal activity LEDs for these channels are located at the I/O-Box. Inputs to the RS-232 channels are
non-isolated on the HDB-TX card itself, but are protected by current limiting resistors (1K) and transient
voltage suppressors (TVS). Additional isolation for the dedicated RS-232 channels is provided by the I/O-Box,
per section 4.1.3. Maximum data rate supported on RS-232 channels is 115.2 kbaud.
Four plug-in sockets located on the main board are compatible with any plug-in module available for the AIB-4
cards. When installing a plug-in module, ensure the white dots on the plug-in module and HDB-TX PCB are
aligned. External connectors and signal activity LEDs for these channels are also located at the I/O-Box. Input
protection for AIB modules depends on the type of plug-in, but generally includes isolation via opto-couplers
or transformers to complement the fuses and transient voltage suppressors located on the data I/O board.
Data rates up to 2.5 Mbaud are supported with the RS-485/422 plug-in module.
See section 4.3.1 for details on the AIB plug-in modules.
Installation Notes:
Use small 75 ohm coaxial cable for video connections (e.g. RG-179) terminated in right angled
SMB connectors, such as Johnson P/N 131-1403-116. Runs of cable should be kept as short as possible,
< 5 m, to minimize high frequency attenuation. For long runs of cable, use a larger 75 ohm cable, such as
RG-59, with appropriate adaptors.
When removing the HDB-TX card from the card rack, follow the procedures given in section 6.6. In addition,
the board must only be partially removed until the ribbon cable header is accessible. The ribbon cable must
then be disconnected prior to fully extracting the card. This procedure must be reversed when reinstalling the
card. If the ribbon cable is routed internally, care should be taken to avoid pinching it or snagging it on
adjacent cards. In some cases, the adjacent card may need to be partially removed to facilitate card
extraction.
A strip of ESD-safe plastic is clipped to the front of each HDB-TX card and extends inside the card, along the
ribbon cable. This clip is intended to cover and protect the ribbon cable from damage during installation and
removal of the HDB-TX card or adjacent FMB.
Summary of Contents for Focal 903
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