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7800 MultiFrame Manual
7737/7837CD2 Dual Composite Decoder
6.
JUMPERS
6.1.
TERMINATION JUMPERS
REF TERM:
The REF TERM jumper J20 located on the rear of the 7837CD2 board near the
white multi-pin connector selects the reference video termination impedance. Either
75Ω or a high-Z (27kΩ) termination impedance can be selected by placing the
jumper in the "75" (top justified) or "HI-Z" (bottom justified) positions, respectively.
CH1, 2 TERM:
The CH1 (J21) and CH2 (J22) TERM jumpers located on the rear of the 7837CD2
board near the white multi-pin connector, selects the video input termination
impedance. Either 75Ω or a high-Z (27kΩ) termination impedance can be selected
by placing the jumper in the "75" (top justified) or "HI-Z" (bottom justified) positions,
respectively.
6.2.
SELECTING WHETHER LOCAL FAULTS WILL BE MONITORED
BY THE GLOBAL FRAME STATUS
FRAME STATUS:
The FRAME STATUS jumper J4, located near the module extractor on the
7837CD2 board, determines whether local faults (as shown by the Local Fault
indicator) will be connected to the 7800FR frame's global status bus.
To monitor faults on this module with the frame status indicators (on the PS FRAME
STATUS LED's and on the Frame's Fault Tally output) install this jumper. (Default)
When this jumper is moved to the OFF position, local faults on this module will not
be monitored.
6.3.
CONFIGURING THE MODULE FOR FIRMWARE UPGRADE PROCEDURES
The following method can be used to upgrade the firmware in the module.
UPGRADE:
The UPGRADE jumper J5, located at the front edge of the 7837CD2 board above
the module extractor, is used when firmware upgrades are being done to the
module. For normal operation it should be installed in the RUN position.
To upgrade the firmware in the module unit, pull it out of the frame. Move Jumper
J5 into the UPGRADE position. Install the Upgrade cable provided (located in the
vinyl pouch in the front of this manual) onto header J10 at the module edge. Re-
install the module into the frame.
module from the frame, move J5 into the RUN position, remove the upgrade cable
and re-install the module. The module is now ready for normal operation.
Page - 22
Once the upgrade is complete, remove the
Revision 1.0
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