Grass Valley PDR100 - Manual (Page 44)

Chapter 3 Mechanical Installation
3-20 PDR100 Installation
Connecting the Audio In and Audio Out for Serial Video
Each Analog Audio circuit board supports four channels of audio input or output. The
channels or banks of audio are labeled A through D. Two internal clock cables
synchronize the Audio circuit board to its associated Serial Video circuit board.
(There are two boards assigned to each Serial Video circuit board for this application.)
The Audio circuit boards accept DB-25 connector-equipped cables. In order to
interface with standard XLR connectors, either a “breakout box,” such as the
Tektronix XLR100 Audio Bypass Unit, or a special cable that provides eight XLR
connectors from a single DB-25 connector will be required. The adaptor cable can
also be ordered from Tektronix. See “Optional Accessories.”
Analog Composite (NTSC or PAL)
Connecting Composite Video Input
The composite input circuitry requires two circuit board slots. One slot is used for the
input circuitry and one for the composite decoder circuitry. The Input circuit board
requires connection to the Video Router, while the Decoder circuit board does not;
however, they must reside in adjacent slots. In addition, an Analog Audio circuit
board is required and must be located next to either the Video Input or Decoder circuit
boards. Since a Decoder board requires only an EISA bus connection, it can be
installed in slot J4 with an Analog Audio circuit board in slot J3, and the Video Input
circuit board in slot J6 (which is on the Video Router.)
The configuration shown in Figure 3-22 is three video inputs and four video outputs.
Note that the Video Input circuit boards have high impedance bridging loop-through
inputs, which require termination in 75
Ω
, or the characteristic impedance of the video
program line. Note also that there is an Audio circuit board for each Video Input
circuit board, and they are shown numbered as the software would initially configure
them. The circuit boards are scanned from right to left, by the software, and assigned
numbers accordingly.
Connecting Composite Analog Video Output
There are four channels of Composite Analog Video Output along with one Video
Monitor output. The Video Monitor Output is channel four video with Time Code
burn in available. See Figure 3-22. The outputs have a characteristic impedance of
75
Ω
, and require external termination. Note that there is an adjacent Analog Audio
circuit board to provide output audio. Only two slots in the Video Router J11 and J12
have the required four in video connections; therefore, these are the only two slots that
can have the Composite Analog Video Output circuit board.
Connecting the Audio In and Audio Out for Analog Composite Video
Each Analog Audio circuit board supports four channels of audio input or output.
Two internal clock cables provide the audio circuit board with the clock to
synchronize it to the associated video I/O circuit board, either Input or Output. The
Audio circuit boards accept DB-25 connector equipped cables. In order to interface
with standard XLR connectors either a “breakout box,” such as the Tektronix
XLR100 Audio Bypass Unit, or a special cable that provides eight XLR connectors
from a single DB-25 connector will be required. The adaptor cable can also be ordered
from Tektronix (see “Optional Accessories”).