Grass Valley 8920ADT User Manual
8920ADT
AUDIO A-TO-D CONVERTER WITH DELAY TRACKING
Instruction Manual
071806700
FIRST PRINTING: APRIL 2001
1.0software release
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Contents
Preface
About This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
8920ADT Analog Audio to AES/EBU Converter with Delay Tracking
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Frame Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Module Placement in the 8900 Frame. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Cabling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Delay Control In/Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Reference Inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Power Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Operation Indicator LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Local Onboard Module Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Input Level Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Adjusting Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Configuring Output Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Remote Control Lockout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Remote Configuration and Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Module Configuration Displays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Software Update Displays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Module Configuration Displays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Differential Input, Analog Gain and A/D Converters. . . . . . . . . . . . . . . . . . . . . 26
Digital Reference Input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Routing and Control FPGA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Power Supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Index
8920ADT Instruction Manual iii
Contents
iv 8920ADT Instruction Manual
Preface
About This Manual
This manual describes the features of a specific module of the 8900 Series
Modular Products family. As part of this module family, it is subject to
Safety and Regulatory Compliance described in the 8900 Series frame and
power supply documentation (see the 8900TX/8900TF/8900TFN Frames
Instruction Manual ).
8920ADT Instruction Manual v
Preface
vi 8920ADT Instruction Manual
8920ADT Analog Audio to AES/EBU Converter with Delay Tracking
Introduction
The 8920ADT converts analog audio to digital and applies a fixed and/or
auto-tracking delay to the digital audio. The right and left channel audio
inputs enter via a terminal block-to-BNC adapter on the rear panel. A delay
control input is provided for inserting an RS-232 level auto-tracking signal
from a frame synchronizer. An external reference of AES, 48 kHz Word
Clock, or 525/625 video is required to lock the module. The reference signal
is connected to loop-through input BNCs. The module outputs 2 AES/EBU
unbalanced 75
The 8920ADT can modify the outgoing signal to provide channel swapping, channel summing, tone and phase inversion. The remote control
capability supports mode selection, fixed and auto-tracking delay, and
input gain control (requires 8900NET module software version 2.1 or later).
The 8920ADT features:
24-bit quantization,
■
■
Loop-through reference input accepts 48 kHz Word Clock, 525/625
Color Black, or AES3id signals,
48 kHz sampling rate,
■
Terminal block input and output via adapters,
■
Ω
signals through BNCs on the rear panel.
■
Independent input level control from +8 dBu to +28 dBu,
■
Fixed delay range in 2 ms steps,
Auto-tracking from a Grass Valley video frame sync device,
■
■
Remote control via ethernet frame interface, and
■
Remote control lockout via onboard jumper.
8920ADT Instruction Manual 1
1.
2.
8920ADT Analog Audio to AES/EBU Converter with Delay Tracking
Installation
Installation of the 8920ADT module is a process of:
Placing the module in the desired frame slot, and
Cabling and terminating signal ports.
The 8920ADT module can be plugged in and removed from an 8900 Series
frame with power on. When power is applied to the module, LED indicators reflect the initialization process (see Power Up on page 6).
Frame Capacity
The 8920ADT module can be installed in all 8900 Series 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. Power, Cooling, and Module Capacity of 8900 Frames
Capacity Calculated
Power (W) 60 60 100 100 100
Recommended Module Cooling (W) 30 60 30 90 90
8920ADT Modules 10 10 10 10 10
Note
Module capacity figures assume no other modules are in the frame.
8900T2
Frame
Module Placement in the 8900 Frame
There are ten cell locations in the frame to accommodate either analog or
digital modules. These are the left ten locations. Refer to Figure 1 on page 3.
The two cells on the right are allocated for the power supplies. For additional information concerning the Power Supply module, refer to the 8900
Frame manual.
The third cell from the right is allocated for the Frame Monitor or Network
Interface controller modules. These modules provide health monitoring
and control options.
8900T2-F
Frame
8900TX
Frame
8900TF
Frame
8900TFN
Frame
2 8920ADT Instruction Manual
Frame Monitor Module or
Network Interface Module
Any 8900 Module
Power
Supplies
(only)
8067_04
1.
2.
3.
Figure 1. 8900 Series Frame
Installation
DA10
J1 J2
O
J3 J4
U
T
J5 J6
J7 J8
J9 J10
IN
DA9
J2
J1 J2
O
J4
J3 J4
J6
J5 J6
J8
J7 J8
J9 J10
IN
8900 modules are interchangeable within the module cells. There are 10
BNC connectors in each cell’s I/O group. The functional assignment of
each connector in a group is determined by the module that is placed in
that cell. The maximum number of modules an 8900 frame can accept is
ten. Figure 2 illustrates the rear connector plate for an 8900 Series frame.
Figure 2. 8900 Series Frame Rear Connector
DA3
J2
J1 J2
O
J4
J3 J4
U
T
J6
J5 J6
J8
J7 J8
J9 J10
IN
DA2
J1 J2
O
J3 J4
U
T
J5 J6
J7 J8
J9 J10
IN
J1 J2
J3 J4
J5 J6
J7 J8
U
T
DA8
J1 J2
O
J3 J4
U
T
J5 J6
J7 J8
J9 J10
IN
DA7
J1 J2
J2
O
J3 J4
J4
U
T
J5 J6
J6
J7 J8
J8
J9 J10
IN
DA6
J1 J2
O
J3 J4
U
T
J5 J6
J7 J8
J9 J10
IN
DA5
J1 J2
J2
O
J3 J4
J4
U
T
J5 J6
J6
J7 J8
J8
J9 J10
IN
DA4
J1 J2
O
J3 J4
U
T
J5 J6
J7 J8
J9 J10
IN
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.
DA1
O
U
T
J9 J10
IN
8067-03
Verify that the module connector seats properly against the backplane.
Press the ejector tab in to seat the module in place.
8920ADT Instruction Manual 3
8920ADT Analog Audio to AES/EBU Converter with Delay Tracking
Cabling
Inputs
The 8920ADT receives a pair of balanced differential analog inputs (left and
right channels) via the rear plug-in adapter connected to BNCs J1 – J4 as
shown in Figure 3. Connect a balanced input source to the stereo pair input
terminal block as specified in Table 2.
Table 2. Balanced Input Connections
Audio Channel Input Terminal Block
Left L +, GND, L –
Right R +, GND, R –
CAUTION The input signal must be balanced. Connecting an unbalanced input signal at
high signal levels may damage the input receivers.
Balanced
input adapter
L+
GND
L–
8920ADT
Grass Valley
Adapter
Figure 3.
Delay control in
Delay control out
(buffered output)
Input/Output Connectors
DAx
J1
R+
GND
R–
J3
J5
J7
J9
O
U
T
IN
Reference
loop-through input
J2
J2
J4
J4
J6
J6
J8
J8
J10
AES output (+)
AES output (-)
8067_02
Balanced
output adapter
Grass Valley
Adapter
+
GND
–
4 8920ADT Instruction Manual
Outputs
The 8920ADT provides two unbalanced AES3id/EBU serial digital outputs
J6 (AES Output +) and J8 (AES Output –). The module can be jumpered to
use these outputs as a balanced differential AES3id output using the BNCto-terminal strip output adapter provided.
Connect balanced or unbalanced outputs as specified in Table 3.
Table 3. Output Connections
Unbalanced Outputs
Audio Channel BNC Connector Audio Channel Terminal Block
AES3id Output +
AES3id Output – J8, – OUT
Delay Control In/Out
An RS-232 level control signal from a frame synchronizer can be connected
to the Delay Control In BNC at J5 for auto-tracking audio delay. The Delay
Control In signal is also buffered and sent to the Delay Control Out BNC at
J7 so multiple units can be daisy chained to the frame synchronizer control
line.
J6, + OUT
Installation
Balanced Outputs
Single balanced output +, GND, –
Reference Inputs
Loop-through input BNCs at J9 and J10 are provided for the required
module reference. The reference signal can be an AES 48 kHz Word Clock,
video reference (NTSC/PAL color black), or an AES3id signal. If the
looping connector is not used, terminate the BNC into 75
Ω
.
8920ADT Instruction Manual 5
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