Grass Valley 8921ADT User Manual

8921ADT

4-CH AUDIO A-D CONVERTER w/DELAY TRACK

Instruction Manual

SOFTWARE VERSION 1.0.0

071820400
OCTOBER 2003

Contacting Grass Valley

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Support: 530-478-4148

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Copyright © Thomson Broadcast and Media Solutions All rights reserved.

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Support: [phone]

[phone]

Grass Valley
P.O. Box 599000
Nevada City, CA 95959­7900 USA

www.thomsongrassvalley.com

The www

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2 8921ADT Instruction Manual

Contents

Preface

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

About This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

8921ADT 4-Channel Audio A-D Converter with Delay

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Module On-board Jumper Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Frame Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Module Placement in the Gecko 8900-A Audio Frame . . . . . . . . . . . . . . . . . . . . 10

Cabling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Analog Audio Inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Digital AES Audio Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Tracking Input/Output. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Reference Loop-through Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Power Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Operation Indicator LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Configuration Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Analog Audio Inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Audio Channel Pairing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Audio Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Audio Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Auto Tracking. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Reference Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Recalling Factory Defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Local Onboard Module Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Configuration Switches and Controls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

8921ADT Module Onboard Configuration Settings. . . . . . . . . . . . . . . . . . . . . 26

Remote Configuration and Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

8921ADT Links and Web Pages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Status Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

I/O Config Page. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Functional View Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Module Configuration Pages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

E-MEM Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Slot Config Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Software Update Page. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Control Panel Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Status Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

8921ADT Instruction Manual 3

Contents

Frame Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Web Browser Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

SNMP Reporting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Index

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

4 8921ADT Instruction Manual

Preface

About This Manual

This manual describes the features of a specific module of the Gecko 8900
Signal Processing System. As part of this module family, it is subject to
Safety and Regulatory Compliance described in the Gecko 8900 Series
frame and power supply documentation (see the

Frames Instruction Manual

8900TX/8900TF/8900TFN

).

8921ADT Instruction Manual 5

Preface

6 8921ADT Instruction Manual

8921ADT 4-Channel Audio A-D Converter with Delay

Introduction

The 8921ADT module offers four independent, audio A-D conversions on
a single module. Four channels of analog audio are converted to two digital
audio streams. Two forms of delay are provided—a fixed delay and a vari­able delay based on a signal from a video decoder with a frame synchro­nizer or from a frame sync card.

The 8921ADT features:

• 24-bit ADC A-to-D conversion,

• >105 dB A weighted signal-to-noise ratio,

• The four channels of audio analog to digital conversion has indepen­dent controls for:

•Channel pairing,

• Level adjustment,

•Output swapping, summation, phase inversion,

•Delay up to 5 seconds for each channel or channel pair, and

• 400 Hz, 1 k Hz, and 1 kHz channel ID test tones.

•Auto-tracking delay of video frame synchronizers (8900FSS and
8981FS),

• Four inputs, two pairs of balanced High Z analog audio inputs,

• Looping reference input supports NTSC/PAL analog color black,
48 kHz AES Word Clock, and 48 kHz AES3-id DARS.

•Optional 8900-A-CBL package of four breakout cables, to convert 3-pin
balanced AES audio to dual 75

Ω BNCs, unbalanced AES audio, and

•Remote control and SNMP alarms with the 8900NET module.

8921ADT Instruction Manual 7

Installation

Installation

Module On-board Jumper Settings

1.

2.

3.

Installation of the 8921ADT module is a process of:

The 8921ADT module can be plugged in and removed from a Gecko 8900
audio frame with power on. When power is applied to the module, LED
indicators reflect the initialization process (see Power Up on page 14).

A number of jumpers must be set on the module to determine module for­matting before installing it in the frame. Refer to Table 1 for a summary of
each jumper and Figure 1 on page 9 for jumper locations on the module
circuit board.

Setting on-board jumpers for desired output formats,

Placing the module in the proper audio frame slot, and

Cabling and terminating signal ports.

Table 1. 8921ADT Jumper Settings

Jumper Function Pins 1-2 Pins 2-3 Notes

J2 AES 1&2 Out 1

J3 AES 1&2 Out 2 BAL UN
J4 AES 1&2 Out 3 BAL UN
J5 BNC J11 AES 1 TRK IN Assign BNC function as Tracking In or AES 1 output (unbalanced)
J6 BNC J12 AES 2 TRK OUT Assign BNC function as Tracking Out or AES 2 output (unbalanced)

J11 Local/Remote LOCAL REMOTE

J12 Sample Rate – 48 kHZ Sample rate default is set to 48 KHz for this release.
J13 AES 1 Output Resolution 20 BITS 24 BITS
J14 AES 2 Output Resolution 20 BITS 24 BITS

BAL

(Balanced

110

Ω )

UN

(Unbalanced

75 Ω ) Set AES outputs to balanced or unbalanced (unbalanced setting requires

cable adapter).

Move jumper to Local to lock out remote control if desired. Shipped
from factory with Remote setting.

Set output resolution for AES outputs. These settings can be overridden
remotely on the Audio Proc web page or with a control panel.

8 8921ADT Instruction Manual

Figure 1. On-Board Jumper Locations

Set jumper J11 to
LOC (1-2) local only, remote lockout
or LOC/REM (2-3) local and remote.

LOC

J11

LOC/REM

J11

Set jumpers J2, J3, and J4
to BAL (1-2) balanced or
UN (2-3) unbalanced to
match output format.

AES 1&2 0UT3

UN

J4

J6

J4

J5

BAL

J2

J3

AES 1&2 0UT1

UNUNBAL

J2

BAL

J3

AES 1&2 0UT2

Installation

J14

J14

AES2

24BITS 20 BITS

SAMPLE RATE

J12

J13

AES1

J13

24BITS 20 BITS

48kHz

J12

96kHz

TRK

Leave jumper J12
set for sample rate
of 48kHz (2-3).

Set jumpers J13 (AES1) and J14 (AES2)
for an output resolution of
20 BITS (pins 1-2) or
24 BITS (pins 2-3).

OUT

AES2

J6

TRK IN

J5

AES1

Set jumper J5 for AES1 (1-2)
or TRK IN (2-3) for BNC J11.
Set jumper J6 to AES2 (1-2)
or TRK OUT (2-3) for BNC J12.

8204_04

8921ADT Instruction Manual 9

Installation

Frame Capacity

The 8921ADT module can be installed in all Gecko 8900-A audio frames
but with varying maximum quantities determined by frame cooling
capacity. Table 2 provides the power capacity, cooling capacity, and
maximum module count for each frame type.

Table 2. Video Frame Power Capacity

Capacity Calculated 8900TX Frame 8900TF Frame 8900TFN Frame

Power (W) 100 100 100
Recommended Module Cooling (W) 30 90 90
8921ADT Modules 10 10 10

Note

Module capacity figures assume no other modules are in the frame.
X = Not recommended without forced air cooling.

Module Placement in the Gecko 8900-A Audio Frame

There are ten cell locations in the audio frame to accommodate audio mod­ules. These are the left ten locations. Refer to Figure 2.

The two cells on the right are allocated for the power supplies. For addi­tional information concerning the Power Supply module, refer to the 8900
Power Supply manual.

The third cell from the right is allocated for the Frame Monitor or 8900NET
Network Interface module. These modules provide health monitoring and
control options.

Figure 2. Gecko 8900 Series Frame

8157_04r1

8900 Audio Media Modules

Frame Monitor or

8900NET Network

Interface Module

10 8921ADT Instruction Manual

Power

Supplies

(only)

1.

3.

Installation

8900 module slots are interchangeable within the frame. There are audio
connectors and BNCs in each slot’s I/O group. The functional assignment
of each connector in a group is determined by the module that is placed in
that slot. The maximum number of modules a Gecko 8900 audio frame can
accept is ten. Figure 3 illustrates the rear connector plate for a Gecko 8900
audio frame. A detail of the audio connector is given in Figure 4 on page 13.

Figure 3. Gecko 8900 Series Audio Frame Rear Connector

J1

J2

J3

J4

J5

J6

J7

J8

J9

J10

J11

J12

J13

J14

IN
10

J1

J2

J3

J4

J5

J6

J7

J8

J9

J10

J11

J12

J13

J14

IN

9

J1

J2

J3

J4

J5

J6

J7

J8

J9

J10

J11

J12

J13

J14

IN
8

J1

J2

J3

J4

J5

J6

J7

J8

J9

J10

J11

J12

J13

J14

IN
7

J1

J2

J3

J4

J5

J6

J7

J8

J9

J10

J11

J12

J13

J14

IN

6

J1

J2

J3

J4

J5

J6

J7

J8

J9

J10

J11

J12

J13

J14

IN

5

J1

J2

J3

J4

J5

J6

J7

J8

J9

J10

J11

J12

J13

J14

IN

4

J1

J2

J3

J4

J5

J6

J7

J8

J9

J10

J11

J12

J13

J14

IN

3

J1

J2

J3

J4

J5

J6

J7

J8

J9

J10

J11

J12

J13

J14

IN

2

J1

J2

J3

J4

J5

J6

J7

J8

J9

J10

J11

J12

J13

0636 -17

J14

IN

1

To install a module in the frame:

Insert the module, connector end first, with the component side of the
module facing to the right and the ejector tab to the top.

2.

Verify that the module connector seats properly against the backplane.

Press in the ejector tab to seat the module.

8921ADT Instruction Manual 11

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

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

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

Audio Channel Pairing

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 out­puts. 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

Balanced Outputs

Three balanced 110
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.

on page 17.

below.

Ω

AES outputs are available with standard 3-pin

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

• J2 (AES 1&2 Out 1)

• J3 (AES 1&2 Out 2)

• J4 (AES 1&2 Out 3)

BAL

, pins 1-2) as shown in Figure 1 on page 9:

Unbalanced Outputs

Each balanced audio output pair can be converted to unbalanced by con­necting 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 (

12 8921ADT Instruction Manual

,

pins 2-3).

UN

Installation

To use J11 and J12 as unbalanced audio outputs if a tracking input or output
is not required, jumper J5 to pins 1-2 (AES1) and J6 to pins 1-2 (AES2). Refer
to Figure 1 on page 9 and Tracking Input/Output on page 13.

Figure 4. 8921ADT Rear Input/Output Connectors

+ - G

Strain relief

+ - G

Secure with
cable tie

AES 1-1

AES 1-2

AES 1-3

Audio In 1

Audio In 3

Tracking Input
(J5 set to 2-3)

or

AES 1 Out

(J5 set to 1-2)

J11

J13

J1

J2

J3

J4

J5

J6

J7

J8

J9

J10

J12

J14

IN

AES 2-1 (Set jumper J2 for BAL or UN outputs
on both AES 1-1 and AES 2-1)

J2

AES 2-2 (Set jumper J3 for BAL or UN output
on both AES 1-2 and AES 2-2)
AES 2-3 (Set jumper J4 for BAL or UN output
on both AES 1-3 and AES 2-3)
Audio In 2

Audio In 4

Tracking Output

(J6 set to 2-3)

or

AES 2 Out

(J6 set to 1-2)

Tracking Input/Output

A Tracking Input is provided at BNC J11. Connect an RS-232 level auto
tracking signal from a video frame synchronizer (such as an 8900FSS or
8981FS) to this BNC and set jumper J5 (Figure 1 on page 9) to TRK IN
(pins 2-3).

If you need to loop the tracking input signal to another destination, a buff­ered looping output is available at BNC J12. To make this Tracking Output
available, jumper J6 (Figure 1 on page 9) to pins 2-3 (TRK OUT).

If no input and/or output audio tracking is needed, these BNCs can be
jumpered to provide additional unbalanced AES 1 and AES 2 BNC outputs
as described in

Digital AES Audio Outputs

Reference Loop-through Input

Connect an NTSC/PAL analog color black reference, AES 48 kHz Word
Clock signal, or 48 KHz AES3-id DARS signal to one of the loop-through
reference connectors, J13 or J14. Terminate the unused connector into 75
if the signal is not looped to other equipment.

Looping

Reference Input

on page 12.

8204_03

Ω

8921ADT Instruction Manual 13

Power Up

Power Up

The front LED indicators and configuration switches are illustrated in

Figure 5. Upon power-up, the green PWR LED should light and the yellow

CONF LED should illuminate for a few seconds for the duration of module
initialization.

Figure 5. LEDs and Configuration Switches

FAULT (red)
TRK ON (green)

COMM (yellow)
LOCKED (green)

PWR (green)

REM OVR (yellow)

1
2
3
4

CONFIG (yellow)

INPUT SELECT (green)

CH1

CH2

> -40 dBFS/CLIP LEDS

CH3

CH4

(green or red)

BANK 2 (yellow)

8204_06

14 8921ADT Instruction Manual

Operation Indicator LEDs

Refer to Figure 5 and Table 3 for the name and meaning of each of the board
edge operating indicators on the module circuit board.

Table 3. Board Edge LED Names and Meaning

LED Indication Condition

Off Normal operation.

FAULT

(red)

COMM

(yellow)

CONFIG

(yellow)

PWR

(green)

REM OVR

(yellow)

TRK ON
(green)

LOCKED

(green)

BANK 2

(yellow)

INPUT 1-4

(green)

> –40 dBFS/CLIP

CH 1-4

(green/red)

On continuously Module has detected an internal fault. (Refer to Functional Description on page 48.)

Long Flash

Off No activity on frame communication bus.

3 Quick Pulses Locate Module command received by the module from a remote control system.

Short flash Activity present on the frame communication bus.

Off Module is in normal operating mode.

On continuously Module is initializing, changing operating modes or programming hardware.

3 Quick Pulses Locate Module command received by the module from a remote control system.

Off No power to module or module’s DC/DC converter failed.

On continuously Normal operation, module is powered.

Off Parameter settings match those set on module switches and jumpers.

On

Off No delay tracking. Tracking signal not received.
On Auto delay is receiving a tracking delay input.
Off No reference is present or reference is present but not locked.
On Module is timed to the reference input.
Off Bank 1 of Control rotary switch is active.
On Bank 2 of Control rotary switch is active.
Off Indicated input is not selected for AES output channel selected with CONTROL rotary switch.
On Indicated input is selected for AES output channel selected with CONTROL rotary switch.
Off Input level is less than –40dBFS and not clipping.

Green Input level is greater than –40dBFS and not clipping.

Red Input level is greater than –40dBFS and clipping.

User configuration problems. Reference input missing or not locked. Processor failed to
load/configure or diagnostics failed on one or more devices.

A setting on the module circuit board switches or jumpers is being overridden by remote control
system.

Power Up

8921ADT Instruction Manual 15

Configuration

Configuration

The 8921ADT can be configured locally using onboard switches or
remotely using the 8900NET network interface GUI or a networked control
panel. Operation of these control types is explained in detail in their respec­tive sections of this manual.

Refer to the following sections for configuration instructions:

•Configuration Summary (page 16)

• Local Onboard Module Configuration (page 25)

•Remote Control and Monitoring (page 28)

•Control Panel Configuration (page 45)

Configuration Summary

This section provides a summary of all parameters that can be configured
on the 8921ADT module. Use this section in conjunction with the specific
configuration method instructions for each configuration type. Table 4 on

page 22 provides a summary in table format of all parameters and their

ranges, default values, and remote, local, and control panel function names
and locations for setting each value.

For a functional block diagram and an overview of the module stages, refer
to the

Analog Audio Inputs

The maximum signal level of the analog inputs (before clipping and distor­tion occur) should be set for full-scale digital outputs (0 dBFS). This level
can be adjusted from 0 to +30 dBu. Each input can be adjusted individually
or locked together in two groups, Inputs 1 and 2, and Inputs 3 and 4. When
locked together, any gain offsets are preserved between channels.

It is helpful before making any input level adjustments to have the module
set up for factory default audio values. This will assure that no summing,
phase inversion, or channel swapping is occurring on the outputs and will
set the module with the following factory defaults:

Functional Description

on page 48.

•Maximum input levels to + 24 dBu = 0 dBFS.

•Output gains to 0 dB

•Delay to 0 sec

• Input mapping to Inputs 1, 2 = AES 1 A, B, Inputs 3, 4 to AES 2 C, D

To quickly access these defaults, select position F on the front panel Control
rotary switch on Bank 2 then activate the paddle switch in the up direction.

16 8921ADT Instruction Manual

If you know the maximum signal level of your audio inputs, you can enter
the value directly into the web page level adjustment fields. Refer to

Audio Inputs Page

For local control (no 8900NET module), you can adjust maximum input
levels by metering the corresponding output with a digital audio meter. To
correctly adjust the input levels for your digital application, use one of the
methods below:

•Apply a signal at – 1 dB below your maximum signal level to the analog
input and monitor the corresponding AES output with a meter that
indicates digital level in dBFS. Adjust each output until the meter indi­cates – 1 dBFS.

•Apply an input audio level that is -20 dB below the maximum level,
(+4 dBu for the default, +24 dBu -20 dB = +4 dBu) and adjust the level
as indicated on a digital audio meter to -20 dBFS.

Audio Channel Pairing

The four analog input channels can be routed to any of the left and right
channel outputs of AES 1 and AES 2.

Configuration

Analog

on page 35.

Audio Delay

The audio outputs can be delayed manually or synchronized to an external
auto-tracking input signal such as an input from an 8960DEC with 8900FSS
or 8981FS.

Each output channel can be delayed individually or locked together in two
groups, AES 1 Ch A and B, and AES 2 Ch C and D.

8921ADT Instruction Manual 17

Configuration

Audio Processing

Audio processing can be performed on the outputs of AES 1 and AES 2 to
set the output processing mode, the output resolution, gain of each output
stream, and the output sample rate with the Audio Proc controls.

Output Processing Modes

The AES 1 output can be set to one of the following output modes:

•A, B (Pass) – the inputs selected for A and B appear at the AES output
unmodified.

•– A, – B (both phase inverted) – the inputs selected for A and B are both
inverted at the AES output.

•– A, B (A Phase Inverted) – the input selected for the A channel is
inverted while the B channel is non-inverted at the AES output.

•A, – B (B Phase Inverted) – the input selected for the A channel is not
inverted while the B channel is inverted at the AES output.

•A + B, (monaural sum) – the inputs selected for the A and B channels
are reduced in level by 6 dB, summed together, and output on both
channels at the AES output.

•A + B, A–B (MD D/E) – will be a – 6 dB mono sum to A and – 6 dB dif­ference decode/encode to B.

•– (A + B) (A + B to Both and Phase Invert) – the inputs selected for the
A and B channels are reduced in level by 6 dB, summed together,
inverted, and output on both channels at the AES output.

•1 kHz (Tone) – a 1 kHz tone is put on both channels at the AES output
with a – 20 dBFS level.

• 400 Hz (Tone) – a 400 Hz tone is put on both channels at the AES output
with a – 20 dBFS level.

• Silence – digital silence is placed on both channels at the AES output.

•A + B, C – the two channels chosen for AES 1 A and B are reduced in
level by 6 dB, summed and sent to the A output. The Ch C audio from
AES 2 will be put on both sides of the Ch B output. In this mode, AES 2
will pass its inputs for C and D as selected with the output processing
control for AES 2.

•A + B, D – the two channels chosen for AES 1 A and B are reduced in
level by 6 dB, summed and sent to the A output. The Ch D audio from
AES 2 will be put on both sides of the Ch B output. In this mode, AES 2
will pass its inputs for C and D as selected with the output processing
control for AES 2.

•A/B ID – A/B identification tone. A 1 kHz continuous tone with a
– 20 dBFS level for 1 second on Ch A followed by a 3 second continuous
tone on the Ch B (keeps repeating).

18 8921ADT Instruction Manual