Grass Valley SMS-6000 Series - Manual (Page 49)

2-4
Section 2 — Installation
Audio Inputs and Outputs
The connections of the audio signals to the equipment are made using
50-pin connectors. One connector is used for each 16 inputs and another for
each 16 outputs. The same type or polarity of connector is used for inputs
and outputs.
The 16x4 and 16x16 stereo audio routers are 1RU high. One pair of
connectors is for the Channel I inputs and outputs (that is, mono operation)
and a second pair for the Channel II inputs and outputs for the second
(stereo) audio level.
The 32x32 mono audio analog matrix is a 2RU frame. Two frames are used
for stereo. One pair of connectors is provided for Inputs 1–16 and 17–32
and a second pair labeled “Outputs 1–16 B” and “Outputs 17–32 B” for
Outputs 1–16 and 17–32. The connectors labeled “Outputs 1–16 A” and
“Outputs 17–32 A” are reserved for special applications.
The 32x32 AES/EBU digital audio frame outputs are assigned to rear
connectors as follows:
Outputs 1-16: “Outputs 1-16A”
Outputs 17-32: “Outputs 1-16B”
The mating halves of these connectors are plug types and available as
options. They are not supplied as standard because many customers wish
to buy their connectors in bulk and prepare the cables in advance of the
equipment being shipped.
Each connector has three pins for each signal: signal hot (+), signal cold
(–) and shield (screen). The same pattern of wiring is used on all four
connectors, (Input 1 is wired the same as Output 1). All the connectors on
the rear of the frames are sockets. Table 2-1 on page 5 and Table 2-1 on
page 6 list the connector pinouts for these cables.
The input and output cable screen (shield) pins are wired together inside
the frame and to a pair of screw terminals on the rear of the frame. This
enables the installer to choose whether the input and/or output signal
cable shields are grounded or not. It is sound audio practice not to ground
the shields at both ends, as sometimes hum can be introduced due to
ground potential differences.