GRASS VALLEY 8920MUX - User manual

8920MUX
VIDEO/AUDIO MULTIPLEXER MODULE
Instruction Manual
SOFTWARE VERSION 4.2.0
071803704
APRIL 2004

2 8920MUX Instruction Manual
Contacting Grass Valley
Copyright © Thomson Broadcast and Media Solutions All rights reserved.
Grass Valley Web Site
The www.thomsongrassvalley.com web site offers the following:
Online User Documentation — Current versions of product catalogs, brochures,
data sheets, ordering guides, planning guides, manuals, and release notes
in .pdf format can be downloaded.
FAQ Database
— Solutions to problems and troubleshooting efforts can be
found by searching our Frequently Asked Questions (FAQ) database.
Software Downloads
— Software updates, drivers, and patches can be down-
loaded.
Region Voice Fax Address Web Site
North America [phone]
Support: 530-478-4148 Sales: [phone] Support: [phone] Grass Valley P.O. Box 599000
Nevada City, CA 95959-
7900 USA
www.thomsongrassvalley.com
Pacific Operations [phone]
Support: 852-2585-6579 [phone]
U.K., Asia, Middle East [phone] [phone]
France [phone]
Germany, Europe [phone] [phone]

8920MUX Instruction Manual 3
Contents
Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
About This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
8920MUX Video/Audio Multiplexer
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Software Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Setting On-Board Jumpers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Frame Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Module Placement in the 8900 Frame. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Cabling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Power Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Operation Indicator LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Configuration Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Multiplexing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Synchronization Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
AES Input Channel Status Bits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Local On-board Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Remote Configuration and Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
8920MUX Links and Web Pages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Newton Control Panel Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Status Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Frame Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Web Browser Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
SNMP Reporting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Input Equalizing Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Serial to Parallel Converter and EDH/EDA Error Processor . . . . . . . . . . . . . . . 42
27Mhz Phase Lock Loop (PLL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Field Programmable Gate Array (FPGA). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Multiplexer (MUX) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Parallel to Serial Converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
CPU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
AES3 Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Power Supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

4 8920MUX Instruction Manual
Contents

8920MUX Instruction Manual 5
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 ).

6 8920MUX Instruction Manual
Preface

8920MUX Instruction Manual 7
8920MUX Video/Audio
Multiplexer
Introduction
The 8920MUX is a single format Serial Digital (SD) Video/AES3 multi-
plexer that inserts AES/EBU audio into the ancillary data space of
SD 270 Mbit component 525 or 625 digital video. An audio group contains
up to two AES/EBU audio streams. Each audio group in the SD input
signal (up to four groups total) is packaged with a unique identification
(ID). The 8920MUX uses this ID to insert, replace, or delete any one of the
existing groups. The module can also delete all ancillary data contained in
the SD input signal.
The 8920MUX:
•Is a hot-swappable module (can be removed and replaced in the frame
with power on),
• Stores settings in non-volatile memory (if the power to the module is
cycled, the module will maintain its settings),
•Multiplexes up to two AES/EBU audio digital streams,
•Requires 48 kHz AES/EBU streams synchronous or asynchronous
(minimum grade 2 compliant AES audio within ± 50 ppm of the 48 kHz
sample rate) with input SD video,
•Supports Grass Valley Modular Remote Configuration and Monitoring
web browser and Newton Control Panel (with 8900NET module
running software version 3.2.0 or later),
• Supports EDH (error detection and handling) error reporting system
for the video and audio signal,
•Can delete incoming audio groups,
•Can select one of four audio groups to replace or delete, and
•Provides a status display of incoming and inserted/replaced audio
groups.

8 8920MUX Instruction Manual
Software Requirements
Software Requirements
Operation of 8920MUX modules with version 4.2.0 software or later require
an 8900NET module running version 3.2.0 or later software. To upgrade
your 8900NET module, go to the Grass Valley web site or contact Customer
Service. See Contacting Grass Valley on page 2 for contact information.
Installation
Installation of the 8920MUX module is a process of:
1.
Setting on-board jumpers to determine audio input type (110
Ω
balanced or 75
Ω unbalanced) and remote control lockout,
2.
Placing the module in the proper frame slot, and
3.
Cabling and terminating signal ports.
The 8920MUX module can be plugged in and removed from an 8900 Series
frame with power on. When power is applied to the module, LED indica-
tors reflect the initialization process (see Power Up on page 12).
Setting On-Board Jumpers
Jumpers on the 8920MUX module must be set for remote or local control
and for the audio input type with the following on-board jumpers shown
in Figure 1 on page 9:
• Jumper JP10 sets control mode for Local only or Remote and Local.
When a jumper is placed across pins 2 and 3 of jumper block JP10,
module output mode settings are adjustable from the Local on-board
switches only. To have both Local and Remote access, set the jumper
across pins 1 and 2.
• Jumpers JP1, JP5, JP7, and JP8 select either 75
Ω unbalanced or 110 Ω
balanced AES/EBU inputs. All four jumpers must be set for the correct
input type.

8920MUX Instruction Manual 9
Installation
Figure 1. On-board Jumper Settings
Frame Capacity
The 8920MUX 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.
Note Module capacity figures assume no other modules are in the frame.
Module Placement in the 8900 Frame
There are ten slot locations in the frame to accommodate either analog or
digital modules. These are the left ten locations. Refer to Figure 2.
The two slots on the right are allocated for the power supplies. For addi-
tional information concerning the Power Supply module, refer to the 8900
Frame manual.
The third slot from the right is allocated for the Frame Monitor, or 8900NET
Network Interface module. These modules provide health monitoring and
control options.
Table 1. Power, Cooling, and Module Capacity of 8900 Frames
Capacity Calculated 8900T2
Frame 8900T2-F Frame 8900TX Frame 8900TF Frame 8900TFN Frame
Power (W) 60 60 100 100 100
Recommended Module Cooling (W) 30 60 30 90 90
8920MUX Modules 6 10 6 10 10
8037_11
JP10
LOCAL –
REMOTE –
jumper across these pins
locks out remote control
jumper across these pins
enables remote and
local control
Remote Control Lockout
Audio Input
Selection
JP10
JP1
JP5
JP7
JP8
JP1
JP5
JP7
JP8
75 Ω
unbal.
AES 1
110 Ω
bal.
75 Ω
unbal. 110 Ω
bal.
75 Ω
unbal. 110 Ω
bal.
75 Ω
unbal. 110 Ω
bal.
AES 2

10 8920MUX Instruction Manual
Installation
Figure 2. 8900 Series Frame
8900 modules are interchangeable within the module slots. There are 10
BNC connectors 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 an 8900 frame can accept is
ten. Figure 3 illustrates the rear connector plate for an 8900 Series frame.
Figure 3. 8900 Series Frame Rear Connector
To install a module in the frame:
1.
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.
3.
Press the ejector tab in to seat the module in place.
Frame Controller or
8900NET Module (only)
Any 8900 Module Power
Supplies
(only)
8037-04r1
8037-03
J1 J2
J3 J4
J5 J6
J7 J8
J9 J10
IN
DA1
J2
J4
J6
J8
J1 J2
J3 J4
J5 J6
J7 J8
J9 J10
IN
DA3
J1 J2
J3 J4
J5 J6
J7 J8
J9 J10
IN
DA5
J1 J2
J3 J4
J5 J6
J7 J8
J9 J10
IN
DA2
J1 J2
J3 J4
J5 J6
J7 J8
J9 J10
IN
DA7
J1 J2
J3 J4
J5 J6
J7 J8
J9 J10
IN
DA9
J1 J2
J3 J4
J5 J6
J7 J8
J9 J10
IN
DA4
J2
J4
J6
J8
J1 J2
J3 J4
J5 J6
J7 J8
J9 J10
IN
DA6
J2
J4
J6
J8
J1 J2
J3 J4
J5 J6
J7 J8
J9 J10
IN
DA8
J2
J4
J6
J8
J1 J2
J3 J4
J5 J6
J7 J8
J9 J10
IN
DA10
O
U
T
O
U
T
O
U
T
O
U
T
O
U
T
O
U
T
O
U
T
O
U
T
O
U
T
O
U
T

8920MUX Instruction Manual 11
Installation
Cabling
Note At the back of every hard cover manual are overlay cards that can be placed
over the rear connector BNCs to identify the specific 8920MUX connector
functions.
Inputs
The SD video stream is connected to the looping input BNC at J9 or J10.
For balanced audio inputs, use the terminal post adapter shown in Figure 4
to connect up to two AES/EBU input sources. The adapter connects to the
plus and minus BNC pairs J5/J7 and J6/J8.
Connect unbalanced AES/EBU input BNCs to J5 and J6.
Note Jumper selections on the module must be made to select either 75 Ω unbal-
anced or 110 Ω balanced AES/EBU input (see Figure 1 on page 9).
Figure 4.
8920MUX
Input/Output Connectors
Outputs
The 8920MUX provides four SD output streams—J1 through J4. The desti-
nation equipment should have a 75 Ω input impedance or loop-through
inputs that are terminated into 75
Ω .
J9 J10
IN
J3
J5
J7
J4
J6
J8
J2J1
8037-02r1
Loop-through
SD Input
SD Output 1
SD Output 3
AES Input 1
unbalanced 75 Ω
SD Output 2
SD Output 4
AES Input 2
unbalanced 75 Ω
Adapter for
balanced 110 Ω
inputs, connects
to BNCs J5 - J8.
X
O
U
T
J1
J4
R+
GND
R–
L+
GND
L–
Grass Valley
Adapter
AES
Input 1 AES
Input 2

12 8920MUX Instruction Manual
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 the duration of module initialization.
Operation Indicator LEDs
With factory default configuration and a valid SD input with AES/EBU
audio content, the green PWR LED, the SD format (either 525 or 625) LED,
and the appropriate audio Signal Present LEDs should be on. The appro-
priate yellow Insert LED (G1 through G4) will indicate which audio group
(if any) the module is configured to insert.
Note A flashing Insert LED indicates an invalid insertion configuration has been
attempted and the existing audio group has not been deleted or replaced.
Figure 5. Operation Indicator LEDs
SW1 – Function Rotary Switch
G1
G4
2nd LED (yellow)
SW2 – Select/Adjust Paddle Switch
EDH presence (yellow)
24-bit Audio insertion (yellow)
8037_05
FAULT (red)
COMM (yellow)
CONF (yellow)
PWR (green)
Audio G1 through G4
Signal Present (green)
Audio G1 through G4
Insert (yellow)
625 (green)
525 (green)
AES 1 (green)
AES 2 (green)

8920MUX Instruction Manual 13
Power Up
A red FAULT LED indicates an error situation and, with the other LEDs,
can indicate the operational conditions presented in Table 2. The table
describes signal output and LED indications for various input/reference
combinations and user settings.
Table 2. Indicator LEDs and Conditions Indicated
LED Indication Condition
FAULT
(red)
Off Normal operation.
On continuously Module has detected an internal fault.
Long flash Configuration problems. Check inputs and settings.
Short flash EDH error detected.
COMM
(yellow)
Off No activity on frame communication bus.
Long flash Location Command received by the module from a remote control system.
Short flash Activity present on the frame communication bus.
CONF
(yellow)
Off Module is in normal operating mode.
On continuously Module is initializing, changing operating modes or updating firmware.
PWR
(green)
Off No power to module or module’s DC/DC converter failed.
On continuously Normal operation, module is powered.
625
(green)
Off No video or standard is other than 625.
On continuously Valid 625 video signal is present.
525
(green)
Off No video or standard is other than 525.
On continuously Valid 525 video signal is present.
AES1 P
(green)
Off No valid AES stream is present at input 1.
On continuously Valid 48 kHz AES 3 stream at input 1.
AES2 P
(green)
Off No valid AES stream is present at input 2.
On continuously Valid 48 kHz AES 3 stream at input 2.
G1_PR
(green)
Off No audio present in group G1.
On continuously Audio present in group G1 and passing through.
Flashing Audio present in group G1 but has been replaced or deleted.
G2_PR
(green)
Off No audio present in group G2.
On continuously Audio present in group G2 and passing through.
Flashing Audio present in group G2 but has been replaced or deleted.
G3_PR
(green)
Off No audio present in group G3.
On continuously Audio present in group G3 and passing through.
Flashing Audio present in group G3 but has been replaced or deleted.
G4_PR
(green)
Off No audio present in group G4.
On continuously Audio present in group G4 and passing through.
Flashing Audio present in group G4 but has been replaced or deleted.
G1_INS
(yellow)
Off G1 audio will not be inserted.
On continuously G1 audio will be inserted.
Flashing G1 audio cannot be inserted because the existing G1 audio has not been
deleted or replaced.

14 8920MUX Instruction Manual
Power Up
Table 3 provides the possible input conditions and the output condition
that results and front LED status.
G2_INS
(yellow)
Off G2 audio will not be inserted.
On continuously G2 audio will be inserted.
Flashing G2 audio cannot be inserted because the existing G2 audio has not been
deleted or replaced.
G3_INS
(yellow)
Off G3 audio will not be inserted.
On continuously G3 audio will be inserted.
Flashing G3 audio cannot be inserted because the existing G3 audio has not been
deleted or replaced.
G4_INS
(yellow)
Off G4 audio will not be inserted.
On continuously G4 audio will be inserted.
Flashing G4 audio cannot be inserted because the existing G4 audio has not been
deleted or replaced.
2ND
(green)
Off First bank of configuration functions is being addressed by the Function
Rotary Switch (SW1).
On continuously Second bank of functions is being addressed.
24b
(yellow)
Off Encoding is 20-bit.
On continuously Encoding is 24-bit.
EDH
(yellow)
Off Normal operation, EDH packet present in incoming SD stream.
On EDH packet not present in incoming SD stream. The module will report a sig-
nal or PLL (phase lock) loss condition.
Table 3. Possible Operating Conditions
SD Video Input AES/EBU Input Setting Mode(s) Output Condition
Video input present Synchronous 48 kHz
audio input present Pass all syn.AES asyn.AES
syn.matrix
Input signal will be passed to the output with no new group embedded.
Since no new group insertion is selected, AES1 P and AES2 P LEDs
(signal present) will be on if any AES stream is present. G1-4_PR (sig-
nal present) LEDs will be on to indicate any embedded audio groups
present.
Video input present Synchronous 48 kHz
audio input present Auto insert syn.AES asyn.AES
syn.matrix
8920MUX will insert the input AES/EBU audio into the first
available audio group (G1 through G4) and light the corresponding
G1-4_INS (insert) LEDs. If all groups are occupied, no new group will
be added and the G1-4_INS LEDs will flash.
Video input present Synchronous 48 kHz
audio input present Insert G1, G2, G3, or G4 syn.AES asyn.AES
syn.matrix
8920MUX will insert a new audio group with the appropriate group ID
and light the corresponding G1-4_INS LED. If the group already exists,
no new group will be inserted and the corresponding G1-4_INS LED
will flash.
Video input present Synchronous 48 kHz
audio input present Replace G1, G2, G3, or G4 syn.AES asyn.AES 8920MUX will insert a new audio group with the appropriate group ID and light the corresponding G1-4_INS LED. If the group already exists
it will be replaced with the new group and the corresponding G1-4_PR
LED will flash.
Video input present Synchronous 48 kHz
audio input present Delete all syn.AES asyn.AES All existing incoming audio groups will be deleted and the G1-4_PR LEDs will flash. If an insert setting is selected, the module will insert
one group and light the corresponding G1-4_INS LED.
Table 2. Indicator LEDs and Conditions Indicated - (continued)
LED Indication Condition

8920MUX Instruction Manual 15
Power Up
Video input present Synchronous 48 kHz
audio input present Delete G1, G2, G3, or G4 syn.AES asyn.AES The selected group, if present, will be deleted from the incoming stream and the corresponding G1-4_PR will flash. If insert is selected for the
corresponding group, the module will insert the AES/EBU input as that
group and light the G1-4_INS LED.
Video input present Synchronous 48 kHz
audio input present 20-bit syn.AES asyn.AES
syn.matrix
The newly inserted group will be inserted in the 20-bit format. The 24b
LED will be off.
Video input present Synchronous 48 kHz
audio input present 24-bit syn.AES asyn.AES
syn.matrix
The newly inserted group will be inserted in the 24-bit format using the
extended audio packet for the additional bits. The 24b LED will be on.
Video input present No audio input Any syn.AES
asyn.AES
syn.matrix
Input signal will be passed to the output with no new group embedded.
AES1 P and AES2 P LEDs will be off.
No video input Any state Any syn.AES
asyn.AES
syn.matrix
Output is random noise (low level static). The 525 and 625 LEDs indi-
cating valid input video will be off.
Video input present Asynchronous
48 kHz audio input
present
Any syn.AES
syn.matrix AES1 P and AES2 P LEDs will be on if the AES audio is close to the correct frequency. If an insert or replace is selected, the module will try
to embed the new group but a click or noise will be noticeable. If the
frequency is not close, the group will not be embedded and the AES1 P
and AES2 P LEDs will be off.
Video input present Asynchronous
48 kHz audio input
present
Any asyn.AES AES1 P and AES2 P LEDs will be on. The module will embed the new
group and light the corresponding G1-4_INS LED. If the frequency is
not close, the group will not be embedded and the AES1 P and AES2 P
will be off. Small audio effects will be heard at slow rate due to drop-
ping or repeating samples in asyn.AES mode.
Video Input present Both audio inputs are
not 48 kHz Any syn.AES asyn.AES
syn.matrix
No audio groups will be added and AES1 P and AES2 P LEDs will be
off and G1-4_INS LED will flash.
Video input present One audio input is
not 48 kHz and the
other is 48 kHz
Any syn.AES
asyn.AES
syn.matrix
Audio group will be added and AES1 P and AES2 P LEDs will be off for
non-48 kHz audio and on for 48 kHz input and G1-4_INS LED will be
on. The channels related to the non-48 kHz audio will be missing in the
embedded group.
Table 3. Possible Operating Conditions
SD Video Input AES/EBU Input Setting Mode(s) Output Condition

16 8920MUX Instruction Manual
Configuration
Configuration
The 8920MUX can be configured locally using on-board switches or
remotely using the 8900NET network interface GUI or a networked
Newton 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 On-board Module Configuration (page 21)
•Remote Control and Monitoring (page 23)
•Newton Control Panel Configuration (page 34)
Configuration Summary
A configuration summary is provided in this section for the following
items on the 8920MUX:
•Multiplexing (audio insertion/deletion) to determine output composi-
tion (page 17),
• Synchronization modes (page 18), and
•AES Input Channel Status Bits (page 19).
Table 5 on page 20 provides a summary in table format of all parameters
and their ranges, default values, and remote, local, and control panel func-
tion names and locations for setting each value.

8920MUX Instruction Manual 17
Configuration
Multiplexing
Figure 6 illustrates the various multiplexing functions available in the
8920MUX. The module can be used to delete or pass either:
•All of the ancillary data in the SD input stream, or
•One of the four audio groups (G1, G2, G3, or G4).
Figure 6. 8920MUX Multiplexing Options
The Insert function allows you to insert the AES/EBU input into any one of
the audio groups (G1 through G4). If the selected group is already occupied
in the stream, the appropriate yellow Insert LED at the front of the module
will flash to indicate an invalid operation and the insertion is not per-
formed.
The Replace function removes any data in the designated group and inserts
the module’s AES/EBU input signal in that group.
Note Ancillary data space can be limited when using 24-bit audio. Refer to Using
Ancillary Space in the SMPTE standard.
Note The 8920MUX inserts or replaces only one audio group. To change more than
one audio group in the SD stream, you can cable multiple modules in series
and configure each module to manipulate one of the four groups (see
Figure 7 on page 18).
Note The EDH Feed Forward bits from the incoming video for the Full Field and
Active Picture are ignored and set to No Error by the multiplexer IC.
Ancillary Data
• Delete or pass all ancillary
data
• Delete or pass all groups,
delete 1 of 4 audio groups
G1, G2, G3, or G4
• Off
• Insert audio as G1
• Insert audio as G2
• Insert audio as G3
• Insert audio as G4
• Auto insert in first available
audio group space
• Replace G1 audio group
• Replace G2 audio group
• Replace G3 audio group
• Replace G4 audio group
SD Input
Video
8920MUX
Audio Input
AES 1 (2 channels) AES 2 (2 channels)
Delete/Pass
Functions
Insert/Replace
Functions
Multiplex:
One audio group
8037_07r1

18 8920MUX Instruction Manual
Configuration
Figure 7. Multiple 8920MUXs in Series
Synchronization Modes
The 8920MUX can be configured to run in one of three sync modes:
•Synchronous – for AES input (48 kHz, 20/24 bits) that is synchronized
to SD video,
•Asynchronous – for asynchronousAES input (48 kHz, 20/24 bits, grade
2 compliant AES audio within ± 50 ppm of the 48 kHz sample rate), or
• Sync Matrix – synchronous mode with control of audio channel
switching.
Note In Sync Matrix mode, Delete and Replace functions are not available. The
incoming signal must already have space available in the ancillary data for the
AES audio group insertion.
Any one of the three modes can be selected either using on-board switches
or the remote control interfaces (when remote control is enabled). The
switching of audio channel content is done using the GUI or control panel
only (see Audio Matrix on page 29).
Note In Asynchronous mode, the 8920MUX may add or drop audio samples in
each audio channel to maintain correct timing with the SD video signal. This
process can produce timing errors of up to ± 2 audio samples between chan-
nels in the AES stream. Applications requiring exact audio timing should use
one of the synchronous modes.
Audio
group
1 insert
In Out In Out In Out In Out
Audio
group
2 insert
Audio
group
3 insert
Audio
group
4 insert
Four
groups
inserted
SD Input
SD Output
MUX 1 MUX 2 MUX 3 MUX 4
8037_08

8920MUX Instruction Manual 19
Configuration
AES Input Channel Status Bits
AES input channel status bits are handled differently in each of the three
sync modes. The synchronous AES mode (syn.AES) passes the channel
status bits from the AES inputs. The asynchronous AES (asyn.AES) and
synchronous Matrix mode (syn.matrix) modify the input status bits to
prevent random bits from occurring. Refer to Table 4 for a detailed over-
view of what the channel status bits are set to for each mode.
Table 4. AES Channel Status Bits For Each Mode
Byte Bit Description Sync Mode Sync Matrix Mode Async Mode
Byte 0
0 Professional/Consumer Pass Professional=1 Professional=1
1 Audio/Non-audio Pass Audio=0 Audio=0
2
Emphasis Pass No emphasis
100 No emphasis 100
3
4
5 Fs locked/unlocked Pass Locked=0 Locked=0
6Sampling Rate Pass 48 kHz
01 48 kHz 01
7
Byte 1
0
Channel Mode Pass Not indicated
0000 Not indicated 0000
1
2
3
4
User Bit Mode Pass No user information
indicated 0000 No user information indicated 0000
5
6
7
Byte 2
0
Aux Sample Bits Pass (may be wrong if the Mux setting of 20/24 bits
does not match input)
Follows web page:
20 bit=000
24 bit=001
Follows web page:
20 bit=000
24 bit=001
1
2
3
Audio Sample Length Pass (may be wrong if the Mux setting does not
match input) Not indicated=000 Not indicated=0004
5
6Reserved=00 Pass 00 00
7
Bytes 3-22 Various Pass All zeros All zeros
Byte 23 0-7 CRC CRC made correct by Mux
IC if incorrect 20 bit=71h 24 bit=1Eh 20 bit=71h 24 bit=1Eh
VValidity Bit Pass Pass Pass
U User Data Bit Pass Pass Pass
C Channel Status Bit See above See above See above
P Parity Bit Pass Set by firmware Set by firmware

20 8920MUX Instruction Manual
Configuration
Table 5 provides a complete summary of the 8920MUX functions and a
comparison of the functionality available with each control type along with
the ranges and default values for each parameter.
Table 5. Summary of 8920MUX Configuration Functions
Function
Type Default Range/Choices
Resolution Web Page/ Function Name
Jumper or
Rotary Switch
Bank/Setting
Newton
Panel
Mnemonic
Notes/
Conditions
Pass/Delete Audio Groups Pass All
Pass All
Audio Group Management/
Pass/Delete Group
pulldown
1:2
Pass/Del
In local mode,
move paddle up
to delete and
down to pass all.
Delete All 2:1
Delete G1 2:2
Delete G2 2:3
Delete G3 2:4
Delete G4 2:5
Insert/Replace Group Auto Insert
Auto Insert
Audio Group Management/
Insert/Replace Group
pulldown
1:3 (paddle up)
Ins/Repl
In local mode,
move paddle up
to insert or
replace. Moving
paddle down has
no function.
Insert G1 1:4
Insert G2 1:5
Insert G3 1:6
Insert G4 1:7
Replace G1 1:8
Replace G2 1:9
Replace G3 1:A
Replace G4 1:B
Off 1:3 (paddle down)
Bits per sample 20 bit 20 or 24 bit Audio Group Management/
Bits per Sample pulldown
1:C
(20 bits up)
(24 bits down) Bits/Smpl
Synchronization mode syn.AES syn.AES, asyn.AES, or
syn.matrix
Audio Group Management/
Synchronization pulldown
1:D up (syn.matrix)
1:E up (syn.AES)
1:E down (asyn.AES) Synchron See Synchroniza-
tion Modes on
page 18.
Input to AES1A Out AES1A
AES1A, AES1B,
AES2A, AES2B
Audio Matrix/
AES1A Out, AES1B Out,
AES2A Out, AES2B Out
pulldowns
N/A N/A
Remote control
setting only.
Active in
syn.matrix mode.
Input to AES1B Out AES1B
Input to AES2A Out AES2A
Input to AES2B Out AES2B
Recall user settings N/A N/A Recall/Save User Settings/
Recalls User Setup or
Save User Setup button
2:F (up) N/A
Save user settings 2:F (down 3 sec.)
Recall factory defaults See above Recall Fact Default
button 1:F N/A