evertz 7720AD Series User manual

7700 MultiFrame Manual
7720AD Series Serial Digital AES Audio De-Embedder
Revision 1.8
TABLE OF CONTENTS
1. OVERVIEW.........................................................................................................................................1
2. INSTALLATION..................................................................................................................................5
2.1. SDI VIDEO CONNECTIONS .....................................................................................................5
2.2. FIBER OPTIC VIDEO CONNECTIONS.....................................................................................6
2.3. AES AUDIO CONNECTIONS....................................................................................................6
2.4. ANALOG AUDIO CONNECTIONS (7720AD-A4 AND 7720AD-A4-2).......................................6
2.5. ANALOG AUDIO AND LTC CONNECTIONS (7720AD-B-A4-LTC) ........................................6
2.6. CARE AND HANDLING OF OPTICAL FIBER (7720AD-OE ONLY).........................................7
2.6.1. Safety.............................................................................................................................7
2.6.2. Handling And Connecting Fibers ...................................................................................7
3. SPECIFICATIONS..............................................................................................................................8
3.1. SERIAL VIDEO INPUT (7720AD, 7720AD4, 7720AD-A4-2 7720AD4-B AND 7720AD-A4).....8
3.2. OPTICAL INPUT (7720AD-OE).................................................................................................8
3.3. RE-CLOCKED SERIAL VIDEO OUTPUTS...............................................................................8
3.4. UNBALANCED AES AUDIO OUTPUTS...................................................................................8
3.5. BALANCED AES AUDIO OUTPUTS (7720AD4-B AND 7720AD-B-A4-LTC ONLY)................9
3.6. ANALOG AUDIO OUTPUT (7720AD-A4, 7720AD-A4-2 AND 7720AD-B-A4-LTC ONLY).......9
3.7. VITC READER (7720AD-B-A4-LTC ONLY) .............................................................................9
3.8. LINEAR TIME CODE OUTPUT (7720AD-B-A4-LTC ONLY)....................................................9
3.9. SYSTEM PERFORMANCE.......................................................................................................9
3.10. ELECTRICAL ..........................................................................................................................10
3.11. PHYSICAL...............................................................................................................................10
4. STATUS INDICATORS....................................................................................................................11
4.1. MODULE STATUS LEDS........................................................................................................11
4.2. AUDIO GROUP STATUS LEDS .............................................................................................11
5. CARD EDGE CONTROLS ...............................................................................................................12
5.1. SELECTING THE AUDIO GROUP THAT WILL BE DE-EMBEDDED....................................13
5.2. SELECTING THE AUDIO CHANNEL SWAP FUNCTIONS (7720AD AND 7720AD-OE ONLY)13
5.3. ENABLING VISTALINK®CONTROL OF THE MODULE .......................................................14
5.4. SELECTING AES LOCKED GROUP MODE (7720AD4 AND 7720AD4-B ONLY) ...................14

7700 MultiFrame Manual
7720AD Series Serial Digital AES Audio De-Embedder
Revision 1.8
5.5. ADJUSTING THE VOLUME LEVEL ON THE ANALOG OUTPUTS (7720AD-B-A4-LTC,
7720AD-A4 AND 7720AD-A4-2 ONLY)....................................................................................15
5.6. SETTING THE VITC READER LINE NUMBER (7720AD-B-A4-LTC ONLY).........................16
6. JUMPERS.........................................................................................................................................17
6.1. SELECTING WHETHER LOCAL FAULTS WILL BE MONITORED
BY THE GLOBAL FRAME STATUS.......................................................................................18
6.2. CONFIGURING THE MODULE FOR FIRMWARE UPGRADES ............................................18
7. SOFTWARE CONTROL...................................................................................................................18
7.1. STATUS MONITORING ..........................................................................................................18
8. VISTALINK®REMOTE MONITORING/CONTROL..........................................................................19
8.1. WHAT IS VISTALINK®?..............................................................................................................19
8.2. VISTALINK®MONITORED PARAMETERS.............................................................................20
8.3. VISTALINK®CONTROLLED PARAMETERS..........................................................................20
8.4. VISTALINK®TRAPS.................................................................................................................20
Figures
Figure 1-1:7720AD Block Diagram ..................................................................................................................... 2
Figure 1-2: 7720AD4 Block Diagram .................................................................................................................. 2
Figure 1-3: 7720AD4-B Block Diagram............................................................................................................... 2
Figure 1-4: 7720AD-A4 Block Diagram............................................................................................................... 3
Figure 1-5: 7720AD-B-A4-LTC Block Diagram................................................................................................... 3
Figure 1-6: 7720AD-OE Block Diagram.............................................................................................................. 4
Figure 2-1: 7720AD Rear Panels........................................................................................................................ 5
Figure 6-1: Location of Jumpers on 7700PB based versions of 7720AD......................................................... 17
Figure 6-2: Location of Jumpers on 7720AD-OE.............................................................................................. 17
Figure 6-3: Location of Jumpers on 7700PB3 based versions......................................................................... 18
Tables
Table 1-1: De-Embedder Versions...................................................................................................................... 1
Table 4-1:Audio Group Status LEDs................................................................................................................. 11
Table 5-1: DIP Switch Functions (7720AD and 7720AD-OE)........................................................................... 12
Table 5-2: DIP Switch Functions (7720AD4 and 7720AD4-B) .........................................................................12
Table 5-3: DIP Switch Functions (7720AD-A4 and 7720AD-A4-2)................................................................... 12
Table 5-4: DIP Switch Functions (7720AD-B-A4-LTC)..................................................................................... 13
Table 5-5: Audio Group Switch Settings........................................................................................................... 13
Table 5-6: Channel Swap Switch Settings........................................................................................................ 14
Table 5-7: Control Mode Switch Settings.......................................................................................................... 14
Table 5-8: Locked Group Switch Settings......................................................................................................... 14
Table 5-9: Analog Audio Level Adjustment LEDs............................................................................................. 15
Table 5-10: VITC Reader Line Select Switch Settings ..................................................................................... 16
Table 8-1: VistaLINK®Monitored Parameters................................................................................................... 20
Table 8-2: VistaLINK®Controlled Parameters.................................................................................................. 20
Table 8-3: VistaLINK®Traps............................................................................................................................. 20

7700 MultiFrame Manual
7720AD Series Serial Digital AES Audio De-Embedder
Revision 1.8
REVISION HISTORY
REVISION DESCRIPTION DATE
1.0 Preliminary Version Jun 99
1.1 First Release Version Mar 00
1.2 Updated block diagrams to show correct Standard for AES audio May 00
1.2.1 De-embedding latency specification added Mar 01
1.3 7720AD-OE added Aug 01
1.4 7720AD-A4 added Oct 01
1.5 7720AD4-B added Jan 02
1.5.1 Updated Specifications and operation for 7720AD4 and 7720AD4-B Mar 02
1.5.2 Updated DIP Switch Table 2 for 7720AD and 7720AD-OE Jul 03
1.5.3 Updated Analog Audio Specs for 7720AD-A4 Aug 03
1.6 7720AD-B-A4-LTC added Jan 04
1.7 Added VistaLINK®Information May 05
1.8 Added 7720AD-A4-2 information Mar 08
Information contained in this manual is believed to be accurate and reliable. However, Evertz assumes no responsibility for the use thereof nor for
the rights of third parties, which may be effected in any way by the use thereof. Any representations in this document concerning performance of
Evertz products are for informational use only and are not warranties of future performance, either express or implied. The only warranty offered by
Evertz in relation to this product is the Evertz standard limited warranty, stated in the sales contract or order confirmation form.
Although every attempt has been made to accurately describe the features, installation and operation of this product in this manual, no warranty is
granted nor liability assumed in relation to any errors or omissions unless specifically undertaken in the Evertz sales contract or order confirmation.
Information contained in this manual is periodically updated and changes will be incorporated into subsequent editions. If you encounter an error,
please notify Evertz Customer Service department. Evertz reserves the right, without notice or liability, to make changes in equipment design or
specifications.

7700 MultiFrame Manual
7720AD Series Serial Digital AES Audio De-Embedder
Revision 1.8
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7700 MultiFrame Manual
7720AD Series Serial Digital AES Audio De-Embedder
Revision 1.8 7720AD-1
1. OVERVIEW
The 7720AD series Audio De-embedders extract embedded audio as specified by SMPTE 272M from a
270 Mb/s serial digital video signal. The companion 7720AE Audio Embedder facilitates audio multiplexing
at the source. The 7720AD is available in 6 different versions.
Model Input
Audio Outputs 270 Mb/s SDI
Re-clocked Outputs VistaLINK®
Enabled
AES Analog
7720AD
(Discontinued) Electrical (BNC) 2 unbalanced --- 2 No
7720AD4 Electrical (BNC) 4
unbalanced --- --- Yes
7720AD4-B Electrical (BNC) 4 balanced --- 1 Yes
7720AD-B-A4-LTC Electrical (BNC) 2 balanced 4 --- No
7720AD-A4 Electrical (BNC) 2
unbalanced 4 --- Yes
7720AD-OE Optical 2
unbalanced --- 2 Yes
7720AD-A4-2 Electrical (BNC) -- 4 2 Yes
Table 1-1: De-Embedder Versions
The 7720AD-OE version combines the Audio de-embedder with a Fiber to Electrical converter and
provides an economical method of converting optical distribution to SDI video and AES audio. SMPTE
272M allows for up to four groups (4 channels/group) to be embedded within a serial digital signal. The
7720AD can de-embed one audio group onto two unbalanced AES outputs. The 7720AD4 can de-embed
two audio groups onto four unbalanced AES outputs. The 7720AD4-B can de-embed two audio groups
onto four balanced AES outputs. The 7720AD-A4 can de-embed one audio group onto two unbalanced
AES outputs and 4 balanced analog audio outputs. The 7720AD-B-A4-LTC has the ability to read vertical
interval time code (D-VITC) from the SDI video and convert it to linear time code (LTC).
Features:
• Front panel LEDs indicating module status, video presence, selected audio group data is present
• LED indication for the presence of each of the 4 audio groups within the input video
• Audio group selection via card edge DIP switches
• Audio channel swapping selection via card edge DIP switches (not on 7720AD-A4)
• 7720AD-A4 has independent volume controls for each of the audio channel outputs
• 7720AD-OE operates with multi-mode or single-mode fiber
• 7720AD-OE has SC/PC, ST/PC or FC/PC connector options
• VistaLINK®enabled for remote monitoring and control via SNMP. (using VistaLINK®Pro) when
installed in the 7700FR-C frame with a 7700FC VistaLINK®Frame Controller module. – see chart
above for models that are VistaLINK®enabled.
Additional Features for 7720AD-B-A4-LTC:
• 4 balanced analog audio channel outputs or 3 balanced audio and one balanced LTC (DIP Switch
selectable)
• 2 balanced AES pair outputs
• DIP switch selection of VITC reader line

7700 MultiFrame Manual
7720AD Series Serial Digital AES Audio De-Embedder
7720AD-2 Revision 1.8
Equalizer S / P
Audio
Present
Audio Group
De-Embedder
Module
Status
Video
Present
Serial Input
270 Mb/s
(SMPTE 259M)
with embedded
Audio
Serial Outputs
270 Mb/s
AES
Formatter
AES
Formatter
1
2
Cable
Driver
Cable
Driver
Cable
Driver
Re-
Clock
AES Outputs
(SMPTE 276M)
Figure 1-1:7720AD Block Diagram
Equalizer S / P
Audio
Present
Audio Group
De-Embedder
Module
Status
Video
Present
Serial Input
270 Mb/s
(SMPTE 259M)
with embedded
Audio
AES
Formatter
AES
Formatter
1
2
Cable
Driver
AES
Formatter
AES
Formatter
AES Outputs
(SMPTE 276M)
3
4
Cable
Driver
Cable
Driver
Cable
Driver
Figure 1-2: 7720AD4 Block Diagram
Equalizer S / P
Audio
Present
Audio Group
De-Embedder
Module
Status
Video
Present
Serial Input
270 Mb/s
(SMPTE 259M)
with embedded
Audio
AES
Formatter
1
2
AES
Formatter
AES
Formatter
Balanced
AES Outputs
(AES3)
3
4
Cable
Driver
Cable
Driver
AES
Formatter
Cable
Driver
Cable
Driver
Figure 1-3: 7720AD4-B Block Diagram

7700 MultiFrame Manual
7720AD Series Serial Digital AES Audio De-Embedder
Revision 1.8 7720AD-3
Equalizer S / P
Audio
Present
Audio Group
De-Embedder
Module
Status
Video
Present
Serial Input
270 Mb/s
(SMPTE 259M)
with embedded
Audio
AES
Formatter
AES
Formatter
1
2
Cable
Driver
Cable
Driver
Balanced
Analog
Audio
Outputs
D to A
Converter
D to A
Converter
AES Outputs
(SMPTE 276M)
2
1
3
4
Figure 1-4: 7720AD-A4 Block Diagram
Equalizer S / P
Audio Groups
Audio
De-Embedder
& VITC to LTC
Translator
Serial Input
270 Mb/s
(SMPTE 259M)
with embedded
Audio and VITC
1
2
Balanced
Analog Audio
or LTC
Outputs
D to A
Converter
D to A
Converter
Balanced AES Outpu
t
(AES3-1992)
2
1
3
4
AES
Formatter
AES
Formatter
Cable
Driver
Cable
Driver
Control
Card
Edge
Module
Status Video Present Audio Present
Figure 1-5: 7720AD-B-A4-LTC Block Diagram

7700 MultiFrame Manual
7720AD Series Serial Digital AES Audio De-Embedder
7720AD-4 Revision 1.8
Optical to
Electrical
Converter S / P
Audio
Present
Audio Group
Module
Status
Video
Present
Serial Outputs
270 Mb/s
AES
Formatter
AES
Formatter
1
2
Cable
Driver
Cable
Driver
Re-
Clock
AES Outputs
(SMPTE 276M)
Cable
Driver
Optical Input
270 Mb/s
(SMPTE 259M)
with embedded
Audio
De-Embedder
Figure 1-6: 7720AD-OE Block Diagram
Equalizer S / P
Audio
Present
Audio Group
De-Embedder
Module
Status
Video
Present
Serial Input
270 Mb/s
(SMPTE 259M)
with embedded
Audio
1
2
Balanced
Analog
Audio
Outputs
D to A
Converter
D to A
Converter
Video Outputs
2
1
3
4
Figure 7: 7720AD-A4-2 Block Diagram

7700 MultiFrame Manual
7720AD Series Serial Digital AES Audio De-Embedder
Revision 1.8 7720AD-5
2. INSTALLATION
The 7720AD and 7720AD4 modules each come with a companion rear plate that has 5 BNC connectors.
The 7720AD-OE comes with a companion rear plate that has 4 BNC connectors and one SC/PC (shown),
ST/PC or FC/PC optical connector. The 7720AD-A4 comes with a companion rear plate that has 3 BNC
connectors and two 6 pin terminal strips. The 7720AD-A4-2 comes with a companion rear plate that has 3
BNC connectors and one 2x6 pin terminal block connector. For information on mounting the rear plate
and inserting the module into the frame see section 3 of the 7700FR chapter.
Figure 2-1: 7720AD Rear Panels
2.1. SDI VIDEO CONNECTIONS
SDI INPUT On 7720AD, 7720AD4, 7720AD-A4 and 7720AD-B-A4-LTC versions there is an input BNC
connector is for 10-bit serial digital video signals with embedded audio compatible with the
SMPTE 259M standard.
SDI OUTPUT On the 7720AD, 7720AD-A4-2 and 7720AD-OE there are two BNC connectors with
reclocked serial component video outputs, compatible with the SMPTE 259M standard. These
outputs contain a reclocked copy of the input video.
On the 7720AD4-B there is one BNC connector with a reclocked serial component video
output, compatible with the SMPTE 259M standard. This output contains a reclocked copy of
the input video.

7700 MultiFrame Manual
7720AD Series Serial Digital AES Audio De-Embedder
7720AD-6 Revision 1.8
2.2. FIBER OPTIC VIDEO CONNECTIONS
On the 7720AD-OE version there is an input SC/PC (shown), ST/PC or FC/PC female
connector for optical 10-bit serial digital video signals with embedded audio compatible with the
SMPTE 259M standard.
2.3. AES AUDIO CONNECTIONS
All versions except the 7720AD4-B and 7720AD-B-A4-LTC have BNC connectors containing unbalanced
AES that has been de-embedded from the SDI video.
The 7720AD4-B and 7720AD-B-A4-LTC have terminal blocks containing balanced AES that has been de-
embedded from the SDI video. The output audio cables can be secured into the removable portion of the
terminal strips using a small screwdriver. The removable part of the terminal strip is then inserted into the
rear panel.
AES OUTPUT 1 AES audio output from channels 1 and 2 of the audio group selected by DIP switches 1
and 2 for de-embedding.
AES OUTPUT 2 AES audio output from channels 3 and 4 of the audio group selected by DIP switches 1
and 2 for de-embedding.
AES OUTPUT 3 (7720AD4 and 7720AD4-B) AES audio output from channels 1 and 2 of the audio group
selected by DIP switches 5 and 6 for de-embedding.
AES OUTPUT 4 (7720AD4 and 7720AD4-B) AES audio output from channels 3 and 4 of the audio group
selected by DIP switches 5 and 6 for de-embedding.
2.4. ANALOG AUDIO CONNECTIONS (7720AD-A4 and 7720AD-A4-2)
The 7720AD-A4 has two 6 pin terminal blocks containing balanced analog audio that has been de-
embedded from the SDI video. The 7720AD-A4-2 has one 2x6 pin terminal connector that outputs the
balanced analog audio. The output audio cables can be secured into the removable portion of the
terminal strips using a small screwdriver. The removable part of the terminal strip is then inserted into the
rear panel.
ANALOG OUTPUT 1 to 4 Analog audio output from channels 1 to 4 of the audio group selected by DIP
switches 1 and 2 for de-embedding.
2.5. ANALOG AUDIO AND LTC CONNECTIONS (7720AD-B-A4-LTC)
The 7720AD-B-A4-LTC has one 12 pin terminal block containing balanced analog audio that has been de-
embedded from the SDI video. The output audio cables can be secured into the removable portion of the
terminal strips using a small screwdriver. The removable part of the terminal strip is then inserted into the
rear panel.
ANALOG OUTPUT 1 to 4 Analog audio output from channels 1 to 4 of the audio group selected by DIP
switches 1 and 2 for de-embedding.
Analog output 4 can also be selected as a LTC output from the D-VITC being read from the
SDI video. (See section 5.6)

7700 MultiFrame Manual
7720AD Series Serial Digital AES Audio De-Embedder
Revision 1.8 7720AD-7
2.6. CARE AND HANDLING OF OPTICAL FIBER (7720AD-OE Only)
2.6.1. Safety
!
Never look directly into an optical fiber. Non-reversible damage to the eye can
occur in a matter of milliseconds.
The laser modules used in the Evertz fiber optic modules are Class I, with a maximum output power of
2mW, and wavelengths of either 1310 nm or 1470 to 1610 nm.
2.6.2. Handling And Connecting Fibers
"
Never touch the end face of an optical fiber.
The transmission characteristics of the fiber are dependent on the shape of the optical core and therefore
care must be taken to prevent fiber damage due to heavy objects or abrupt fiber bending. Evertz
recommends that you maintain a minimum bending radius of 3 cm to avoid fiber-bending loss that will
decrease the maximum attainable distance of the fiber cable. The Evertz fiber optic modules come with
cable lockout devices, to prevent the user from damaging the fiber by installing a module into a slot in the
frame that does not have a suitable I/O module. For further information about care and handling of fiber
optic cable see section 3 of the Fiber Optics System Design chapter of this manual.

7700 MultiFrame Manual
7720AD Series Serial Digital AES Audio De-Embedder
7720AD-8 Revision 1.8
3. SPECIFICATIONS
3.1. SERIAL VIDEO INPUT (7720AD, 7720AD4, 7720AD-A4-2 7720AD4-B and 7720AD-A4)
Standard: SMPTE 259M C – 525 and 625 component.
Connector: 1 BNC per IEC 60169-8 Amendment 2.
Equalization: Automatic 300m @ 270 Mb/s with Belden 8281 or equivalent cable
Return Loss: > 15 dB up to 540 Mb/s
3.2. OPTICAL INPUT (7720AD-OE)
Standard: SMPTE 259M C – 525 and 625 component.
Connector: SC/PC, ST/PC or FC/PC female housing
Maximum Input Power: 0 dBm
Wavelength 1270 nm to 1610 nm
Optical Sensitivity: -30 dBm @ 270 Mb/s
Fiber Size: 62 µm core / 125 µm overall
3.3. RE-CLOCKED SERIAL VIDEO OUTPUTS
Number of Outputs: 2 on 7720AD, 7720AD-A4-2 and 7720AD-OE
1 on 7720AD4-B
Standard: same as input
Connectors: BNC per IEC 60169-8 Amendment 2.
Signal Level: 800mV nominal
DC Offset: 0V ±0.5V
Rise and Fall Time: 900ps nominal
Overshoot: <10% of amplitude
Return Loss: > 15 dB up to 270 Mb/s
Wide Band Jitter: < 0.2 UI
3.4. UNBALANCED AES AUDIO OUTPUTS
Number of Outputs: 2 on 7720AD, 7720AD-A4 and 7720AD-OE
4 on 7720AD4
Standards: SMPTE 276M, unbalanced synchronous AES
Connectors: BNC per IEC 60169-8 Amendment 2.
Signal Level: 1V p-p
Sampling Rate: 48 kHz
Impedance: 75 Ohms unbalanced
Dynamic Range: 20-bits

7700 MultiFrame Manual
7720AD Series Serial Digital AES Audio De-Embedder
Revision 1.8 7720AD-9
3.5. BALANCED AES AUDIO OUTPUTS (7720AD4-B and 7720AD-B-A4-LTC ONLY)
Number of Outputs:
7720AD4-B 4
7720AD-B-A4-LTC 2
Standard: AES3-1992 balanced AES
Connectors:
7720AD4-B four 3 pin removable terminal strips
7720AD-B-A4-LTC 6 pin removable terminal strip
Sampling Rate: 48 kHz
Signal Level: 5V p-p
Impedance: 110 Ohms
3.6. ANALOG AUDIO OUTPUT (7720AD-A4, 7720AD-A4-2 and 7720AD-B-A4-LTC ONLY)
Number of Outputs: 4
Type: Balanced analog audio
Connector:
7720AD-A4 two 6 pin removable terminal strips
7720AD-B-A4-LTC 12 pin removable terminal strip
Output Impedance: 66Ω
Signal Level: 0dB FS =>8 to 24dBu into 10 kΩ loads (user settable)
0dB FS =>8 to 22dBu into 600 Ω loads (user settable)
Frequency Response: < ±0.1dB (20Hz to 20kHz)
THD+N: > 90dB RMS @ 1kHz, with 24dBu output
Crosstalk isolation: > 90dB RMS (20Hz to 20kHz)
3.7. VITC READER (7720AD-B-A4-LTC ONLY)
Standard: SMPTE 12M, SMPTE 266M
Reader Line Range:
525 line video: 10 to 31
625 line video: 6 to 31
3.8. LINEAR TIME CODE OUTPUT (7720AD-B-A4-LTC ONLY)
Standard: SMPTE 12M
Rate:
525 line video: 29.97 Frames per second
625 line video: 25 Frames per second
Number of Outputs: 1 (when VITC reader is enabled)
Type: Balanced
Connector: 4 pins on 12 pin removable terminal strip
Output Impedance: 66Ω balanced
Signal Level: 1.6 volts p-p nominal
3.9. SYSTEM PERFORMANCE
De-embedding Latency:
SDI to AES: 1.35 mSec (7720AD-A4 and 7720AD-B-A4-LTC)
600 µSec all other versions

7700 MultiFrame Manual
7720AD Series Serial Digital AES Audio De-Embedder
7720AD-10 Revision 1.8
SDI to Analog: 2.25 mSec
3.10. ELECTRICAL
Voltage: + 12VDC
Power: 6 Watts. (7720AD, 7720AD4, 7720AD4-B, 7720AD-OE)
12 watts (7720AD-A4 and 7720AD-B-A4-LTC)
EMI/RFI: Complies with FCC Part 15, class A and EU EMC directive.
3.11. PHYSICAL
7700 or 7701 frame mounting:
Number of slots: 1
Stand Alone Enclosure:
Dimensions: 14 “ L x 4.5 “ W x 1.9 “ H
(355 mm L x 114 mm W x 48 mm H)
Weight: approx. 1.5 lbs. (0.7 Kg)

7700 MultiFrame Manual
7720AD Series Serial Digital AES Audio De-Embedder
Revision 1.8 7720AD-11
4. STATUS INDICATORS
The location of the status LEDs is shown in Figure 6-1 to Figure 6-3.
4.1. MODULE STATUS LEDS
MODULE OK This Green LED will be On when the module is operating properly.
LOCAL FAULT This Red LED makes it easy to identify one module in a frame that is missing an
essential input or has another fault.
The LED will blink on and off if the microprocessor is not running.
The LED will be on solid when input video is lost, the selected audio group is
missing or has DBN errors, or there is a fault in the module power supply.
VIDEO PRESENT: This Green LED will be On when there is a valid video signal present at the module
input.
AUDIO PRESENT: This Green LED will be On if the audio group(s) selected is present and free from
DBN errors.
(7720AD4 and 7720AD4-B) This LED will flash if only 1 group is present and group
lock mode is Off. (See section 5.3)
4.2. AUDIO GROUP STATUS LEDS
Four LEDs located on the lower half (opposite the DIP switch) indicates the presence of the four audio
groups as shown below. Audio Group LED 1 is located near the center of the printed circuit board.
Audio Group
LED Color Audio Group Status
1 Off Group 1 embedded audio is not present on the video input.
Green Group 1 embedded audio is present on the video input.
2 Off Group 2 embedded audio is not present on the video input.
Green Group 2 embedded audio is present on the video input.
3 Off Group 3 embedded audio is not present on the video input.
Green Group 3 embedded audio is present on the video input.
4 Off Group 4 embedded audio is not present on the video input.
Green Group 4 embedded audio is present on the video input.
Table 4-1:Audio Group Status LEDs
On the 7720AD-A4 the audio group LEDs are also used in conjunction with the pushbutton and toggle
switch to allow the user to adjust the volume level of each of the 4 analog outputs. See section 5.3 for
information on adjusting the analog volume levels.

7700 MultiFrame Manual
7720AD Series Serial Digital AES Audio De-Embedder
7720AD-12 Revision 1.8
5. CARD EDGE CONTROLS
At the bottom edge of the module there is an 8 position DIP switch, giving the user control over the
de-embedder. The ON position is closest to the PCB. Sections 5.1 and 5.2 show the assigned DIP switch
functions. On the 7720AD-A4, 7720AD-A4-2 and 7720AD-B-A4-LTC there is also a toggle switch and
pushbutton which are used to set the volume level for the analog outputs.
DIP Switch Function
1
2 AES 1 and AES 2 Group Selection
3 AES 1 Channel Swap
4 AES 2 Channel Swap
5
6
7
8
Not used
Table 5-1: DIP Switch Functions (7720AD and 7720AD-OE)
DIP Switch Function
1
2 AES 1 and AES 2 Group Selection
3 Not used
4 Not used
5
6 AES 3 and AES 4 Group Selection
7 VistaLINK™ Remote Control Enable
8 AES Group Lock Mode Selection
Table 5-2: DIP Switch Functions (7720AD4 and 7720AD4-B)
DIP Switch Function
1
2 AES 1 and AES 2 Group Selection
3 Not used
4 Not used
5 Not used
6 Not used
7 VistaLINK™ Remote Control Enable
8 Analog Audio Volume Adjust Enable
Table 5-3: DIP Switch Functions (7720AD-A4 and 7720AD-A4-2)

7700 MultiFrame Manual
7720AD Series Serial Digital AES Audio De-Embedder
Revision 1.8 7720AD-13
DIP Switch Function
1
2 AES 1 and AES 2 Group Selection
3
4
5
6
7
VITC Reader Line Select
8 Analog Audio Volume Adjust Enable
Table 5-4: DIP Switch Functions (7720AD-B-A4-LTC)
5.1. SELECTING THE AUDIO GROUP THAT WILL BE DE-EMBEDDED
The SMPTE 272M standard permits up to 4 groups of 4 audio channels to be embedded into the 270 Mb/s
video bitstream.
The models 7720AD, 7720AD-A4, 7720AD-A4-2, 7720AD-B-A4-LTC and 7720AD-OE de-embed one
group of audio (selected by switches 1 and 2) onto AES outputs 1 and 2. On the 7720AD-A4, when DIP
switch 7 is On, the de-embedder group is set using VistaLINK®control. On the 7720AD and 7720AD-OE
models switches 3 and 4 select if the channels will be output as they were embedded or if they will be
swapped.
The models 7720AD4 and 7720AD4-B will de-embed two groups of audio, the first group (selected by
switches 1 and 2) on AES outputs 1 and 2, and the second group (selected by switches 5 and 6) on AES
outputs 3 and 4. When DIP switch 7 is On, the de-embedder groups are set using VistaLINK®control.
Switch settings are shown in Table 5-5.
DIP 1 DIP 2 Audio Group Output on
AES 1 and AES 2
and Analog Audio Outputs
Off Off 1
Off On 2
On Off 3
On On 4
DIP 5 DIP 6 Audio Group Output on
AES 3 and AES 4
Off Off 1
Off On 2
On Off 3
On On 4
Table 5-5: Audio Group Switch Settings
5.2. SELECTING THE AUDIO CHANNEL SWAP FUNCTIONS (7720AD and 7720AD-OE only)
Switches 3 and 4 select if the channels will be output on AES 1 and 2 as they were embedded or if they
will be swapped.

7700 MultiFrame Manual
7720AD Series Serial Digital AES Audio De-Embedder
7720AD-14 Revision 1.8
DIP 3 Channel Swap for AES 1
Off Channels 1 & 2 normal
On Channels 1 & 2 swapped
DIP 4 Channel Swap for AES 2
Off Channels 3 & 4 normal
On Channels 3 & 4 swapped
Table 5-6: Channel Swap Switch Settings
5.3. ENABLING VISTALINK®CONTROL OF THE MODULE
The 7720AD4, 7720AD4-B,7721AD-A4 and 7720AD-A4-2 can be controlled using the card edge DIP
switches or remotely via SNMP (using VistaLINK®PRO or the model 9000NCP Network Control Panel).
See section 8 for a full description of the parameters that can be monitored or controlled using VistaLINK®.
VistaLINK®control is only available when the card is installed in the 3RU 7700FR-C frame and a 7700FC
VistaLINK®Frame Controller card is installed in slot 1 of the frame.
DIP switch 7 is used to enable or disable VistaLINK®control.
DIP 7 CONTROL MODE
Off Local control mode. The module will be controlled using the DIP
switches as described in sections 5.1, 5.4 and 5.5.
On VistaLINK™ control mode. The module will be controlled remotely
through SNMP.
Table 5-7: Control Mode Switch Settings
5.4. SELECTING AES LOCKED GROUP MODE (7720AD4 and 7720AD4-B only)
For audio that is synchronous to video there is exactly 8008 audio samples (48kHz sampling rate) in 5
frames of NTSC, 525 line video. Most audio embedders will spread these samples as evenly as possible
throughout the 5 frames of video. Because the 8008 samples do not divide evenly into 5 frames of video,
there is a sequence that only repeats every 5 frames. In order to transport 8 channels of audio (4 AES
pairs) through an embedded link with exactly the same delay on each channel, both the embedder and the
de-embedder must lock both groups of audio to this 5 frame sequence. Failing to do so will cause a
phase difference between the audio from the two groups.
Switch 8 selects if the 7720AD4 and 7720AD4-B will de-embed the two groups independently or locked
together. When DIP switch 7 is On, the locked group selection is set using VistaLINK®control.
DIP 8 Locked Group Selection
Off Independent groups
On Locked groups
Table 5-8: Locked Group Switch Settings
In independent group mode, the two selected groups will be de-multiplexed independently to each other
as if two separate de-multiplexers were used. The output FIFO management will have different reset
timing between the two groups creating different output phase relationships on the associated AES
channels. Both groups do not necessarily need to be present.

7700 MultiFrame Manual
7720AD Series Serial Digital AES Audio De-Embedder
Revision 1.8 7720AD-15
In locked group mode, the resetting of the output FIFOs are locked together thus maintaining the phase
relationship between all 4 AES channel pairs. Because the two groups are tightly tied together, both audio
groups must be present to get any AES audio output.
"
To maintain a guaranteed audio phase relationship through a complete SDI link, the
audio embedder MUST also provide the same locked FIFO management
functionality.
5.5. ADJUSTING THE VOLUME LEVEL ON THE ANALOG OUTPUTS (7720AD-B-A4-LTC, 7720AD-
A4 and 7720AD-A4-2 ONLY)
The toggle switch and pushbutton on the card edge of the 7720AD-A4, 7720AD-A4-2 and 7720AD-B-A4-
LTC are used to adjust the volume control of the analog outputs individually.
"On the 7720AD-B-A4-LTC, the level of analog output 4 does not affect the LTC level
when the VITC reader is enabled.
When DIP switch 8 is Off, volume level adjustments are disabled to prevent accidental changes. When
DIP switch 8 is On the user can adjust the volume of each of the analog audio outputs. On the
7720AD-A4, when DIP switch 7 is On, the volume is set using VistaLINK®control.
The three position, return to center toggle switch is used in conjunction with a momentary pushbutton to
adjust the level of the outputs. The Audio Group LEDs, located on the lower end of the module (opposite
the DIP switch) are used to indicate when the module is in volume level adjust mode and which output is
being adjusted. When one of the LED’s is flashing this indicates that you are adjusting the level of the
respective channel as shown in Table 5-9.
Audio Group
LED Color Audio Group Status
1 Flashing Analog Output 1 level can be adjusted with toggle switch.
2 Flashing Analog Output 2 level can be adjusted with toggle switch.
3 Flashing Analog Output 3 level can be adjusted with toggle switch.
4 Flashing Analog Output 4 level can be adjusted with toggle switch.
Table 5-9: Analog Audio Level Adjustment LEDs
To enter the volume control mode, press the pushbutton. The Output 1 Volume level adjust LED will start
flashing, indicating that the toggle switch can be used to adjust the volume level of analog output 1.
Pressing the toggle switch up will increase the volume level and pressing the toggle switch down will
decrease the volume level.
Continue adjusting the volume level of the other outputs by pressing the pushbutton to select the desired
output and then using the toggle switch to adjust the level. Pressing the pushbutton a fourth time will exit
the volume adjust mode. None of the LEDs will be flashing. You can lock the volume levels by turning off
DIP switch 8. If you stop pressing either the pushbutton or toggle switch for more than 30 seconds, the
module will exit the volume adjust mode.

7700 MultiFrame Manual
7720AD Series Serial Digital AES Audio De-Embedder
7720AD-16 Revision 1.8
5.6. SETTING THE VITC READER LINE NUMBER (7720AD-B-A4-LTC ONLY)
On the 7720AD-B-A4-LTC switches 3 to 7 are used to select the line that the VITC reader will recover
vertical interval time code from. When switches 3 to 7 are set to a valid line as shown in Table 5-10 the
VITC reader will be enabled for reading on the selected line and analog audio output 4 will be used to
output LTC that is slaved to the decoded VITC. When switches 3 to 7 are all Off the VITC reader will be
disabled and analog audio output 4 will be used to output the audio from channel 4.
Dip Switch Line Selected
3 4 5 6 7 525 Video 625 Video
Off Off Off Off Off Disabled Disabled
Off On On Off Off Disabled 6
On On On Off Off Disabled 7
Off Off Off On Off Disabled 8
On Off Off On Off Disabled 9
Off On Off On Off 10 10
On On Off On Off 11 11
Off Off On On Off 12 12
On Off On On Off 13 13
Off On On On Off 14 14
On On On On Off 15 15
Off Off Off Off On 16 16
On Off Off Off On 17 17
Off On Off Off On 18 18
On On Off Off On 19 19
Off Off On Off On 20 20
On Off On Off On 21 21
Off On On Off On 22 22
On On On Off On 23 23
Off Off Off On On 24 24
On Off Off On On 25 25
Off On Off On On 26 26
On On Off On On 27 27
Off Off On On On 28 28
On Off On On On 29 29
Off On On On On 30 30
On On On On On 31 31
Table 5-10: VITC Reader Line Select Switch Settings