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Cabling, Analog audio inputs, Digital aes audio outputs – Grass Valley 8921ADT User Manual

Page 12

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12

8921ADT Instruction Manual

Installation

Cabling

Cabling to and from the module is done at the back of the Gecko 8900 audio
frame as described below. A number of jumpers on the module circuit
board must first be set to assign connectors for the desired outputs (see

Module On-board Jumper Settings

on page 8

).

Analog Audio Inputs

Four balanced analog audio inputs are provided at 3-pin mini-terminal
strip audio connectors J7, J8, J9 and J10. Plastic strain reliefs are provided
for connecting balanced audio connections. Refer to

Figure 4 on page 13

.

Note

Operation with unbalanced analog audio requires single-ended audio with the
negative side and shield tied together with a signal level of < +30 dBu.

Inputs can be routed to any of the four output streams in configuration.
Refer to

Audio Channel Pairing

on page 17

.

Digital AES Audio Outputs

The digital AES audio outputs can be balanced or unbalanced. Each audio
pair must be jumpered on the circuit board for the correct output format.
An optional cable kit is available with four 3-terminal to dual BNC cables
to allow conversion of one balanced output to two unbalanced BNC out-
puts. Another unbalanced output for each channel can also be accessed on
BNCs J11 (AES 1) and J12 (AES 2) by jumpering the module as explained in

Unbalanced Outputs

below.

Balanced Outputs

Three balanced 110

AES outputs are available with standard 3-pin

mini-terminal strip connectors for each AES output stream. Balanced
AES 1&2 Out 1 are available at rear connectors J1/J2, AES 1&2 Out 2 at
J3/J4, and AES 1&2 Out 3 at J5/J6. Plastic strain reliefs are provided for
connecting balanced audio connections. See

Figure 4 on page 13

.

For a balanced output (the factory default), set the following jumpers to
balanced (

BAL

, pins 1-2) as shown in

Figure 1 on page 9

:

J2 (AES 1&2 Out 1)

J3 (AES 1&2 Out 2)

J4 (AES 1&2 Out 3)

Unbalanced Outputs

Each balanced audio output pair can be converted to unbalanced by con-
necting an optional 3-terminal to dual-BNC breakout cable (8900-A-CBL)
to the balanced connector and setting the jumpers described in

Table 1 on

page 8

to unbalanced (

UN

,

pins 2-3).