EVS XT2 - Video and Reference Boards; COHX Board

XT Series DISK RECORDER – Version 9 - Hardware Technical ReferenceIssue 5.00
EVS Broadcast Equipment SA – April 2008
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3.2 VIDEO AND REFERENCE BOARDS
3.2.1 COHX BOARD
The COHX board is divided in 3 parts: COHX base (centre front and
back), COD A module (front left), and COD B module (front right).
COD A and COD B modules are the actual CODEC modules, each of them
being able to be configured by software either as an encoder (for a record
channel) or as a decoder (for a play channel). There are 3 hardware
versions of COD modules : SD only, HD only, or HD/SD. They are clearly
identified by the sticker at the front of the board.
There are 2 versions of the COHX base : one with genlock, one without
genlock. The genlock model can easily be identified by the presence of 3
quartz synthesizer at the back of the board, on the right-hand side, and
by the presence of the GLK and PSU OK LEDs on either side of the DIN
connector at the centre front of the board. Note that a COHX board with
genlock must
be installed as COHX #1 in first position (slot 2) in an XT[2]
system (6U or 4U). A COHX board with genlock can never
be installed in
any other slot, and thus can not be used instead of COHX #2 or #3. Doing
so will result in conflicting electrical signals inside the system.