Grass Valley 8921DAC User Manual
8921DAC
4-CH AUDIO D-A CONVERTER WITH DELAY
Instruction Manual
SOFTWARE VERSION 1.0.0
071821401
JULY 2004
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2 8921DAC 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 8900TX/8900TF/8900TFN
Frames Instruction Manual
).
8921DAC Instruction Manual 3
Preface
4 8921DAC Instruction Manual
Contents
Preface
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
About This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
8921DAC 4-Channel Audio D-A Converter
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Module On-board Jumper Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Frame Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Module Placement in the Gecko 8900 Audio Frame . . . . . . . . . . . . . . . . . . . . . . . 9
Cabling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Audio Inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Audio Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Power Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Operation Indicator LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Configuration Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Audio Channel Pairing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Audio Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Audio Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Maximum Audio Analog Output Levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Local Onboard Module Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Configuration Switches and Controls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
8921DAC Module Onboard Configuration Settings. . . . . . . . . . . . . . . . . . . . . 20
Remote Configuration and Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
8921DAC Links and Web Pages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Status Web Page. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
I/O Config Web Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Functional View Web Page. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Module Configuration Web Pages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
E-MEM Web Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Slot Config Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Software Update Page. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Newton Control Panel Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Status Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Frame Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Web Browser Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
SNMP Reporting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Index
8921DAC Instruction Manual 5
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Contents
6 8921DAC Instruction Manual
8921DAC 4-Channel Audio D-A Converter
Introduction
The 8921DAC provides conversion of two digital audio streams (balanced
or unbalanced) to four balanced processed analog audio channels and four
balanced buffered AES outputs. In addition to conversion, it offers independent delay controls for each channel to compensate for external video
processing.
The 8921DAC features the following:
•Two AES digital audio inputs with:
• Support of both balanced (110
input stream
•Presence and error detection on each input pair
• Sample rate support of 32 kHz to 96 kHz
•Auto-detection of emphasis (50/15) with status report
• Sample word length of up to 24 bits
• Four balanced analog audio outputs with:
• 24-bit DAC D-to-A conversion
• Independent control of each analog audio channel including:
•Channel pairing
• Level adjustment
•Swapping, summation, phase inversion
•Delay up to 5.4 seconds
•Test tone generation
Ω
) and unbalanced inputs (75 Ω
) AES
• Four buffered balanced AES outputs as two groups of two AES streams
for AES input dual distribution (without reclocking),
•Remote web browser and Newton Control Panel interface with the
8900NET module.
8921DAC Instruction Manual 7
Installation
Installation
Module On-board Jumper Settings
1.
2.
3.
Installation of the 8921DAC module is a process of:
Setting on-board jumpers for desired input formats,
Placing the module in the proper audio frame slot, and
Cabling and terminating signal ports.
The 8921DAC 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 12).
The on-board jumpers shown in Figure 1 must be set for the following:
J10
• Local/Remote operation – set jumper J2 to LOC (pins 1-2) to lock out
remote control or LOC/REM (pins 2-3) for both local and remote control.
•AES 1 and AES 2 input format – the input format for AES 1 and AES 2
must be set to either balanced (pins 2-3) or unbalanced (pins 1-2) with
jumpers J9 (AES 2 – IN) and J10 (AES 1 – IN) depending on the input
format desired.
Figure 1. On-Board Jumper Locations
J2
LOC
J2
J9
LOC/REM
UNBAL BAL
AES 1 – IN
UNBAL BAL
AES 2 – IN
J10
J9
Set jumper J2 to
LOC (1-2) local only, remote lockout
or LOC/REM (2-3) local and remote.
Set jumpers J9 and J10
to UNBAL (1-2) unbalanced or
BAL (2-3) balanced to
match input format.
8 8921DAC Instruction Manual
8214_04
Frame Capacity
The 8921DAC module can be installed in all Gecko 8900 audio frames but
with varying maximum quantities determined by frame cooling capacity.
Table 1 provides the power capacity, cooling capacity, and maximum
module count for each frame type.
Table 1. Audio Frame Power Capacity
Power (W) 100 100 100
Recommended Module Cooling (W) 30 90 90
8921DAC Modules 4 10 10
Installation
Capacity Calculated 8900TX Frame 8900TF Frame 8900TFN Frame
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 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
8921DAC Instruction Manual 9
Power
Supplies
(only)
Installation
1.
3.
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.
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
Cabling
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
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.
Cabling to and from the module is done at the back of the Gecko 8900 audio
frame as described below and shown in Figure 4 on page 11. The cabling
information is also silkscreened on the back of the circuit board.
J1
J2
J3
J4
J5
J6
J7
J8
J9
J10
J11
J12
J13
8157_02
J14
IN
1
Audio Inputs
AES audio inputs can be balanced or unbalanced. Jumpers on the circuit
board must be set for the desired format for AES 1 and AES 2. Refer to
Module On-board Jumper Settings on page 8.
Unbalanced Inputs
Unbalanced AES inputs are available at BNCs J11 (AES 1 A/B In) and J12
(AES 2 C/D In).
Balanced Inputs
Balanced AES inputs are available at three terminal connectors J9 (AES 1
A/B In) and J10 (AES 2 C/D In).
10 8921DAC Instruction Manual
Audio Outputs
Audio outputs are available in both analog audio and AES formats.
Analog Audio
There are four high impedance balanced analog audio outputs available
from the module at three terminal connectors J1, J2, J3, and J4.
AES Audio Outputs
Four balanced AES outputs are available at three terminal connectors J5, J6,
J7, and J8.
Figure 4. 8921DAC Rear Input/Output Connectors
+ -
G
Analog Audio
Out 1
Analog Audio
Out 3
AES
Out 1
AES
Out 2
AES 1
A/B In
AES 1
A/B In
Not Used
J11
J13
J1
J3
J5
J7
J9
IN
J10
J2
J4
J6
J8
J12
J14
Installation
Analog Audio
Out 2
Analog Audio
J2
Out 4
AES
Out 3
AES
Out 4
AES 2
C/D In
AES 2
C/D In
Not Used
8214_01
8921DAC Instruction Manual 11
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)
ERR AES1 (red)
COMM (yellow)
ERR AES2 (red)
PWR (green)
1
2
3
4
CONFIG (yellow)
CHANNEL SELECT (green)
CH1
CH2
AUDIO LEVEL (green or red)
CH3
CH4
BANK 2 (yellow)
8214_06
12 8921DAC Instruction Manual
Operation Indicator LEDs
Refer to Figure 5 on page 12 and Table 2 for the name and meaning of each
of the board edge operating indicators on the module circuit board.
Table 2. Board Edge LED Names and Meaning
LED Indication Condition
Off Normal operation.
FAULT
(red)
COMM
(yellow)
CONFIG
(yellow)
PWR
(green)
ERR AES1
(red)
ERR AES2
(red)
CH SEL 1–4
(green)
CH 1-4
AUDIO LVL
(green or red)
BANK 2
(yellow)
On continuously Module has detected an internal fault. (Refer to Service on page 43.)
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.
On No error detected for AES 1 A/B input. SRC A/B ready.
Off
On No error detected for AES 2 C/D input. SRC C/D ready.
Off
Off
On
Off Channel 1-4 Digital processed audio (before DAC) level < – 40 dBFS
Red Channel 1-4 Digital processed audio (before DAC) level > – 40 dBFS but < – 0.5 dBFS
Green Channel 1-4 Digital processed audio (before DAC) level > – 0.5 dBFS
Off Bank 1 of Control rotary switch is active.
On Bank 2 of Control rotary switch is active.
User configuration problems. Input missing or not locked. Processor failed to load/configure or diagnostics failed on one or more devices.
One of the following errors detected for AES 1 A/B input: CRC, Input not present, PLL AES receiver not
locked, Validity Bit set, Non-audio bit set, excessive parity error.
One of the following errors detected for AES 2 C/D input: CRC, Input not present, PLL AES receiver not
locked, Validity Bit set, Non-audio bit set, excessive parity error.
Indicated input A-D is not selected for AES output channel selected with CONTROL rotary switch or
audio channel 1-4 (after pairing) is not affected by adjustment selected with CONTROL rotary switch.
Indicated input A-D is selected for AES output channel selected with CONTROL rotary switch or audio
channel 1-4 (after pairing) is affected by adjustment selected with CONTROL rotary switch.
Power Up
8921DAC Instruction Manual 13
Configuration
Configuration
The 8921DAC can be configured locally using on-board switches or
remotely using the 8900NET network interface GUI or a Newton Control
Panel.
Refer to the following sections for configuration instructions:
•Configuration Summary (page 14)
• Local On-board Module Configuration (page 19)
•Remote Control and Monitoring (page 23)
•Newton Control Panel Configuration (page 40)
Operation of these control types is explained in detail in their respective
sections of this manual.
Configuration Summary
This section provides a summary of all parameters that can be configured
on the 8921DAC module. Use this section in conjunction with the specific
configuration method instructions for each configuration type. Table 3 on
page 17 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.
Audio Channel Pairing
The four AES input channels can be arbitrarily recombined (routed) to any
of the four analog output channels.
Audio Delay
Each analog audio output channel can be delayed individually or locked
together in two groups. Outputs can be delayed up to 5 seconds.
Audio Processing
Audio processing can be performed on the four analog outputs to set the
the gain of each output channel or channel pair and the output processing
mode for each pair.
14 8921DAC Instruction Manual
Configuration
Output Processing Modes
Each analog audio output pair (Channel 1/2 and Channel 3/4) can be set
to one of the following output modes:
• 1, 2 (Pass) – the inputs selected for Channels 1 and 2 appear at the
analog audio output unmodified.
•– 1, – 2 (both phase inverted) – the inputs selected for Channel 1 and 2
are both inverted.
•– 1, 2 (Channel 1 Phase Inverted) – the input selected for Channel 1 is
inverted while Channel 2 is non-inverted.
• 1, – 2 (Channel 2 Phase Inverted) – the input selected for Channel 2 is
inverted while Channel 1 is non-inverted.
•1 + 2, (monaural sum) – the inputs selected for Channels 1 and 2 are
reduced in level by 6 dB, summed together, and output on both channels.
•1 + 2, 1 – 2 (MD D/E) – 1 + 2 to Channel 1; 1 – 2 to Channel 2, – 6 dB
mono sum to Channel 1 and – 6dB 1 – 2 decode/encode to Channel 2.
•– (1 +2) (1 + 2 to Both and Phase Invert) – the inputs selected for Chan-
nels 1 and 2 are reduced in level by 6 dB, summed together, inverted,
and output on both channels.
•1 kHz (Tone) – a 1 kHz tone is put on both channels at the analog audio
output with a – 20 dBFS level.
• 400 Hz (Tone) – a 400 Hz tone is put on both channels at the analog
audio output with a – 20 dBFS level.
• Silence – digital silence is placed on both output channels.
•1 + 2, 3 – the two streams chosen for Channels 1 and 2 will be summed
and sent to the Channel 1 output. The Channel 3 audio from Analog
Outputs 3/4 will be put on the Channel 2 output. In this mode, Analog
Audio Outputs 3/4 will pass its inputs for Channels 3 and 4 as selected
with the output processing control for Channels 3/4.
•1 + 2, 4 – the two streams chosen for Channels 1 and 2 will be summed
and sent to the Channel 1 output. The Channel 4 audio from Channels
3/4 will be put on the Channel 2 output. In this mode, Analog Audio
Outputs 3/4 will pass its inputs for Channels 3 and 4 as selected with
the output processing control for Channels 3/4.
• 1/2 ID – 1/2 identification tone. A 1 kHz tone with a – 20 dBFS level
that is 2 second continuous tone on Channel 1 followed by a 6 second
continuous tone on Channel 2 (keeps repeating).
8921DAC Instruction Manual 15
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