evertz 7800 User manual

7800 MultiFrame Manual
7880DEC-MP2HD-2 Dual HD MPEG-2 Decoder
Revision 1.0 7880DEC-MP2HD-2 - i
TABLE OF CONTENTS
1. OVERVIEW..................................................................................................................................... 1
2. INSTALLATION.............................................................................................................................. 3
2.1. REAR PLATE DESCRIPTION ............................................................................................... 3
2.1.1. Decoder Connections ................................................................................................. 3
2.1.2. Ethernet Connection................................................................................................... 4
2.2. HARDWARE INSTALLATION............................................................................................... 5
2.3. CONFIGURING THE BASIC NETWORK SETTINGS ........................................................... 7
2.4. CONNECTING TO VLPRO .................................................................................................... 8
3. CARD CONFIGURATION............................................................................................................. 10
3.1. INPUT SELECT....................................................................................................................10
3.2. PROGRAM TUNING ............................................................................................................ 11
3.2.1. Program Tuning........................................................................................................ 11
3.3. PROGRAM INFO ................................................................................................................. 13
3.3.1. Program Monitor....................................................................................................... 13
3.3.2. Video Monitor............................................................................................................ 14
3.3.3. Audio 1/2/3/4 Monitor................................................................................................ 14
3.4. OUTPUTS............................................................................................................................. 15
3.4.1. AC3 Decoder Assignments....................................................................................... 15
3.4.2. Embedding Audio Source......................................................................................... 15
3.4.3. Embedding Audio Delay ........................................................................................... 16
3.4.4. Misc. Control............................................................................................................. 16
3.5. GENERAL............................................................................................................................ 17
3.6. MISC FAULTS...................................................................................................................... 18
3.6.1. Trap Status ............................................................................................................... 18
3.6.2. Trap Enable .............................................................................................................. 18
3.7. SNMP CONFIGURATION.................................................................................................... 19
3.7.1. Add Trap Destination................................................................................................ 19
3.7.2. Current Trap Destinations......................................................................................... 19
4. CONFIGURING INPUTS............................................................................................................... 20
4.1. INPUT MONITOR................................................................................................................. 20
4.1.1. Input Monitor............................................................................................................. 20
4.1.2. Input Control ............................................................................................................. 20
4.2. TS SYNTAX ERRORS – P1 & P2........................................................................................ 21
4.2.1. P1 Necessary for Decoding...................................................................................... 22
4.2.2. P2 Recommended.................................................................................................... 22
4.3. TS SYNTAX ERRORS – P3................................................................................................. 24
4.3.1. P3 DVB Tables ......................................................................................................... 24
4.3.2. P3 ATSC Tables....................................................................................................... 25

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4.3.3. ETSI TR 101 290 Test Conditions............................................................................ 26
4.4. TR 101 290 DVB REFERENCE VALUES............................................................................ 27
4.5. PID MONITOR (+MON OPTION) ......................................................................................... 27
4.6. TEMPLATE CHECK............................................................................................................. 29
4.6.1. Global Control........................................................................................................... 29
4.6.2. Misc. Template.......................................................................................................... 30
4.6.3. Window Measurement.............................................................................................. 30
4.7. FAULT CONTROL ............................................................................................................... 31
4.8. TRIGGER FAULTS .............................................................................................................. 32
5. TECHNICAL DESCRIPTION ........................................................................................................ 33
5.1. SPECIFICATIONS................................................................................................................ 33
5.1.1. Inputs and Outputs.................................................................................................... 33
5.1.2. Decoding Specifications............................................................................................ 33
5.1.3. Embedding of HANC & VANC .................................................................................. 33
5.1.4. Electrical33
5.1.5. Physical 33
6. TROUBLESHOOTING.................................................................................................................. 34
6.1. VLPRO DOES NOT DISPLAY THE 7880DEC-MP2HD-2 ALARMS................................... 34
6.2. UPDATING VLPRO SERVER JAR FILE............................................................................. 34
7. ABBREVIATIONS......................................................................................................................... 36

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Revision 1.0 7880DEC-MP2HD-2 - iii
Figures
Figure 1-1: 7880DEC-MP2HD-2 Block Diagram..............................................................................................2
Figure 2-1: 7880DEC-MP2HD-2 Rear Plate.....................................................................................................3
Figure 2-2: 7700 Chassis and 7880DEC-MP2HD-2 Rear Panel .....................................................................5
Figure 2-3: COM Port Properties Window........................................................................................................6
Figure 2-4: HyperTerminal Main Menu.............................................................................................................7
Figure 2-5: Network Configuration Sub-Menu..................................................................................................8
Figure 2-6: VistaLINK®PRO Hardware Configuration......................................................................................9
Figure 3-1 VistaLINK®PRO – Input Select.....................................................................................................10
Figure 3-2 VistaLINK®PRO – Program Tuning..............................................................................................11
Figure 3-3: Select Program Drop Down List...................................................................................................12
Figure 3-4: VistaLINK®PRO – Program Info..................................................................................................13
Figure 3-5 VistaLINK®PRO - Outputs............................................................................................................15
Figure 3-6 VistaLINK®PRO - General............................................................................................................17
Figure 3-7 VistaLINK®PRO – Misc Faults......................................................................................................18
Figure 3-8: VistaLINK®PRO – SNMP Configuration......................................................................................19
Figure 4-1 VistaLINK®PRO – Input Monitor...................................................................................................20
Figure 4-2 VistaLINK®PRO - TS Syntax Errors P1 & P2...............................................................................21
Figure 4-3: VistaLINK®PRO – TS Syntax Errors P3......................................................................................24
Figure 4-4 VistaLINK®PRO – PID Monitor.....................................................................................................28
Figure 4-5: Template Check ...........................................................................................................................29
Figure 4-6 VistaLINK®PRO Fault Monitor......................................................................................................31
Figure 4-7: Trigger Faults ...............................................................................................................................32
Figure 6-1: VistaLINK®PRO Server...............................................................................................................34
Figure 6-2: VistaLINK®PRO – Applying JAR Updates...................................................................................35
Figure 6-3: “Please Restart Your Alarm Server” Dialog Box..........................................................................35
Tables
Table 2-1: Standard RJ-45 Wiring Colour Codes.............................................................................................4
Table 4-1: TR101 290 DVB Reference Values...............................................................................................27

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7880DEC-MP2HD-2 - iv Revision 1.0
REVISION HISTORY
REVISION DESCRIPTION DATE
1.0 First Release Oct 09
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.

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1. OVERVIEW
As broadcasters, cable companies, satellite providers and IPTV companies are moving to a all digital
domain, all distribution is done in the compressed domain. These service providers have a need for a
versatile, easy to use, cost effective pro video decoder.
The 7880DEC-MP2HD-2 is a professional high quality MPEG-2 SD and HD decoder card. It offers
high end SD and HD decoding of two signals coming from 2 ASI inputs. The 7880DEC-MP2HD-2 is
perfect for monitoring applications or decoding for downstream baseband video and audio processing.
The 7880DEC-MP2HD-2 can reconstruct in the most flexible way all VANC & HANC data in the
HD/SDI output.
The front end of the 7880DEC-MP2HD-2 includes advanced ASI input monitor. The 7880DEC-
MP2HD-2 offers 2 ASI inputs to feed 2 independent decoders. The 7880DEC-MP2HD-2 can be
coupled with Evertz RF front end (7780DM2-LB DVB-S2 demodulator) and Evertz downstream video
and audio processing equipment to create a complete versatile integrated receiver/decoder.
Features
•2xSD or HD 422 Video Decoder (422 Optional)
•ASI dual inputs on each decoder
•Selection of decoded service
•(HD) SDI with embedded audio and ancillary data
•Monitoring of ASI inputs
•Fully integrated with the industry leading VistaLINK®PRO system
•Built-in frame controller for control

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Output
Video/audio A
Signal processing
Embedding
Audio
Closed caption TX
ASI input 1
10/100
RJ45 CPU
Control and
measurements
Data Port
Card
Edge Input
Present
Module
Status
Video
decoder A
(HD) SDI output
2A with embedded
audio
Transport
Stream
Process and
selection
TX (HD) SDI output
1A with embedded
audio
ASI input 2
Video
decoder B Output
Video/audio B
Signal processing
Embedding
Audio
Closed caption TX (HD) SDI output
2B with embedded
audio
TX (HD) SDI output
1B with embedded
audio
MPEG or
AC3 Audio
decoderx2
MPEG or
AC3 Audio
decoderx2
7880 Sync signal
reference Optional
Dual Frame Sync
Figure 1-1: 7880DEC-MP2HD-2 Block Diagram

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2. INSTALLATION
2.1. REAR PLATE DESCRIPTION
The 7880DEC-MP2HD-2 comes standard with a companion +3RU rear plate. Figure 2-1 provides an
illustration of the 7880DEC-MP2HD-2 rear plate. For information on mounting the rear plate and
inserting the module into the frame, see section 3 of the 7700FR manual.
Figure 2-1: 7880DEC-MP2HD-2 Rear Plate
2.1.1. Decoder Connections
HD/SDI PROG OUT: Two BNC connectors, one for each decoder. They are used to output main
decoded HD/SD-SDI video signals.
HD/SDI MON OUT: Two BNC connectors, one for each decoder. They are used to output
backup/monitored HD/SD-SDI video signal.
ASI INPUT: Two BNC connectors, one for each decoder. They are used to input ASI
MPEG2 Transport Streams.

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ASI OUTPUT: Two BNC connectors, one for each decoder. They are used to bypass given
ASI Transport Streams.
2.1.2. Ethernet Connection
The 7880DEC-MP2HD-2 Series uses 10Base-T (10 Mbps), 100Base-TX (100 Mbps) or Gigabit
(1Gbps) twisted pair Ethernet cabling systems. When connecting for 10Base-T systems, category 3, 4,
or 5 UTP cable as well as EIA/TIA – 568 100ΩSTP cable may be used. When connecting for
100Base-TX systems, category 5 UTP cable is required. The cable must be “straight-through” with an
RJ-45 connector at each end. Establish the network connection by plugging one end of the cable into
the RJ-45 receptacle of the card and the other end into a port of the supporting hub.
The straight-through RJ-45 cable can be purchased or can be constructed using the pin-out
information in Table 2-1. A colour coded wiring table is provided in Table 2-1 for the current RJ-45
standards (AT&T 258A or EIA/TIA 258B colour coding shown). Also refer to the notes following the
table for additional wiring guide information.
Pin # Signal EIA/TIA 568A AT&T 258A or
EIA/TIA 568B 10BaseT or 100BaseT
1 Transmit + White/Green White/Orange X
2 Transmit – Green/White or White Orange/White or Orange X
3 Receive + White/Orange White/Green X
4 N/A Blue/White or Blue Blue/White or Blue Not used (required)
5 N/A White/Blue White/Blue Not used (required)
6 Receive – Orange/White or Orange Green/White or Green X
7 N/A White/Brown White/Brown Not used (required)
Pin
1
8 N/A Brown/White or Brown Brown/White or Brown Not used (required)
Table 2-1: Standard RJ-45 Wiring Colour Codes
Note the following cabling information for this wiring guide:
•Only two pairs of wires are used in the 8-pin RJ-45 connector to carry Ethernet signals.
•Even though pins 4, 5, 7 and 8 are not used, it is mandatory that they be present in the cable.
•10BaseT and 100BaseT use the same pins (a crossover cable made for one will also work with the
other).
•Pairs may be solid colours and not have a stripe.
•Category 5 cable must use Category 5 rated connectors.
The maximum cable run between the router and the supporting hub is 300 ft (90 m). The maximum
combined cable run between any two end points (i.e. router and PC/laptop via network hub) is 675 feet
(205 m).
Devices on the Ethernet network continually monitor the receive data path for activity as a means of
checking that the link is working correctly. When the network is idle, the devices also send a link test
signal to one another to verify link integrity. The rear panel is fitted with two LEDs to monitor the
Ethernet connection.
1000: This Amber LED is ON when a 100Base-TX link is last detected. The LED is OFF when a
10Base-T link is last detected (the LINK LED is ON). Upon power-up the LED is OFF as
the last detected rate is not known and therefore defaults to the 10Base-T state until rate
detection is completed.

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LN/ACT: This dual purpose Green LED indicates that the card has established a valid linkage to its
hub, and whether the module is sending or receiving data. This LED will be ON when the
module has established a good link to its supporting hub. This gives you a good indication
that the segment is wired correctly. The LED will BLINK when the module is sending or
receiving data. The LED will be OFF if there is no valid connection.
2.2. HARDWARE INSTALLATION
To successfully install the 7880DEC-MP2HD-2:
1. Unused IP address on the network or a DHCP server.
2. Evertz serial cable.
3. VLPro Server IP address.
Before handling the card it is important to minimize the potential effects of static electricity. It is
therefore recommended that an ESD strap be worn. Locate on a 7700 chassis three adjacent vacant
slots. Unpack the 7880DEC-MP2HD-2 and separate the rear panel from the main card. Locate on the
rear of the rack the three slots and remove the blanking panels. Insert the rear panel into the back of
the chassis and secure using the six screws provided.
Figure 2-2: 7700 Chassis and 7880DEC-MP2HD-2 Rear Panel
Before inserting the front card, connect the serial cable to the board using the serial cable provided.
Now insert the 7880DEC-MP2HD-2 card into the corresponding front slots ensuring the card lines up
with the slot runners on the bottom and the top of the chassis. Push the card into the slot ensuring that
when it mates with the rear card that is has been firmly pushed into a seated position. This can be
confirmed when the connectivity lights for the Ethernet port are illuminated. Do not connect any cables
to the rear card (failure to do this could cause unwanted network issues) until the initial configuration
has been completed.

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Figure 2-3: COM Port Properties Window
Connect the 9-pin d-type end of the serial cable to the serial port of your computer. Open a Terminal
session and configure the port for the following configuration:
Click OK to apply these settings and press the return key. The session should respond with the
7880DEC-MP2HD-2 Main Menu as shown in Figure 2-4:
Bits per second 115200
Data Bits 8
Parity None
Stop Bits 2
Flow Control None

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Figure 2-4: HyperTerminal Main Menu
(1) Network Configuration
This sub-menu enables the user to configure the network settings for the card.
(2) SNMP Configuration
This sub-menu enables the user to configure the Simple Network Management Protocol settings. In this
menu you can set or remove the SNMP trap IP address and the SNMP Read and Set community
strings.
(3) Setup Decoder Parameters
This sub-menu is used to configure the decoder parameters. As this configuration can also be
performed via VLPro this sub-menu will not be covered in this section.
(4) Utilities
This sub-menu contains two utilities. One command is for clearing the memory, and the other for
clearing the flash. In normal operation it should not be necessary to use either of these options.
(5) Engineering/Debug
This menu is for Evertz personnel only. You may be requested to access and execute options within
this menu when seeking technical support from Evertz. Guidance will be given should this be required.
Before is it possible to configure the card via VLPro it is first necessary to configure the initial basic
network settings via the serial cable. Refer to section 2.3.
2.3. CONFIGURING THE BASIC NETWORK SETTINGS
Now select option (1) Network Configuration, the Network Configuration menu will be displayed as
shown in Figure 2-5. If you prefer to use DHCP then you may select option (5) Use DHCP, and then
continue from step 4:
1. Select option (1) Set IP Address and configure the IP address for the 7880DEC-MP2HD-2
ensuring that the IP address is not already in use on the network.
2. Now select option (2) Set Netmask and configure the correct subnet mask for your network.
3. If required also configure option (3) Set Gateway.
4. Exit from the Network Configuration menu using (s) Save and Exit, NOT (x) Exit.

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Figure 2-5: Network Configuration Sub-Menu
From the Main Menu select option (2) SNMP Configuration. Select option (1) Set IP Address and enter
the IP address of your VLPro Server. Exit using option (S) Save and Exit, now extract the card from the
rack, remove the serial cable and re-insert it.
You have now completed the necessary minimum configuration and can connect the cables to the rear
card when ready.
2.4. CONNECTING TO VLPRO
This chapter assumes that the VLPro server and VLPro client are already configured for your network
and you have basic knowledge of the VLPro interface. It also assumes that the user or network
administrator has already added the 7880DEC-MP2HD-2 jar file to the server and both the client and
server applications have been restarted. If you are the network administrator refer to section 6.2 for
information on updating the VLPro Server Jar File.
Open VLPro and click on the refresh tree icon. Expand the hardware tree by clicking on the “+” symbol.
Your 7880DEC-MP2HD-2 should appear as a newly listed device with the IP address used to configure
the card in Step 1 above. It may take up to a minute to appear while the card and switch negotiate
network settings (this can be verified directly on the switch if necessary).

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Listed below the 7880DEC-MP2HD-2 will be two inputs numbered one and two.
Figure 2-6: VistaLINK®PRO Hardware Configuration
"
Note: If after a couple of minutes the card has still not appeared try selecting
Add Agent from the Tree> Add/Update Agent menu. Enter the IP address used
in the configuration stage earlier and select OK. The card should now be listed
and will remain greyed out for a moment while VLPro finds the card and
confirms its configuration.
Please consult your network administrator if you continue to have problems connecting the card with
VLPro, alternatively contact Evertz Microsystems Ltd. or your authorized reseller for technical support.

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3. CARD CONFIGURATION
Right click the IP address of the 7880DEC-MP2HD-2 and select “View Configuration”. The
configuration page will open; it is from these configuration tabs that the 7880DEC-MP2HD-2 can be
configured. Refer to the relevant section of this manual for an explanation of the features and functions.
3.1. INPUT SELECT
The input selection tab is used to select the input in use. Both inputs are bypass protected, thus in the
event of the card failing, being removed or the power being cut off, the loop-through for the ASI will
continue. The decoded output will no longer be available.
"NOTE: If the card is removed from the chassis, the ASI loop through will continue
but the decoded output will no longer be available.
Figure 3-1 VistaLINK®PRO – Input Select
•Input Select: The decoder card has two ASI inputs. Select here the input you require.
"NOTE: The decoder has two ASI inputs; the card is a single decoder and is only
able to decode one program from either of the two inputs.
•Input Mode Select:

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oInput Stream Mode: The Input Stream Mode options available are ATSC, DVB and
MPEG. It is important to select the standard to which the stream is being coded as this
affects the context of the alarms for ETSI TR 101 290 priority 3 and the handling of AC3
Audio.
3.2. PROGRAM TUNING
Figure 3-2 VistaLINK®PRO – Program Tuning
3.2.1. Program Tuning
•Program Tuning Mode: Options are Auto, Program Select or PID Select.
oSelection of Auto will set the decoder to decode either the first program in the PAT or the
lowest program number; this can be selected using the next configuration option below.
oProgram select allows the user to define the program number, PCR, video and audio
selection is automatic based upon the PMT.
oPID Select allows the user to define the PCR, Video and up to four audio by their PID
numbers. The PMT PID is ignored.
•Auto Program Select Mode: Options are First Program in PAT or Lowest Program Number.
oFirst program indicates the first program defined within the PAT.
oLowest program number will select the program with the lowest Program ID.
•Program Number: When the Program Tuning mode is set to Program Select, enter in this field
the Program ID in decimal form.
"
Note: You may use the Select Program drop down menu to select the program
that you wish to tune into. The drop down menu will be automatically populated
with the program numbers available in the incoming stream.

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Figure 3-3: Select Program Drop Down List
•Video PID Number: When the Program Tuning mode is set to PID Select, enter in this field the
Video PID ID in decimal form.
•PCR PID Number: When the Program Tuning mode is set to PID Select, enter in this field the
PCR PID ID in decimal form.
•Audio Service 1 PID Number: When the Program Tuning mode is set to PID Select, enter in
this field the first Audio PID ID in decimal form.
•Audio Service 2 PID Number: When the Program Tuning mode is set to PID Select, enter in
this field the second Audio PID ID in decimal form.
•Audio Service 3 PID Number: When the Program Tuning mode is set to PID Select, enter in
this field the third Audio PID ID in decimal form.
•Audio Service 4 PID Number: When the Program Tuning mode is set to PID Select, enter in
this field the forth Audio PID ID in decimal form.
•Video Playout Type: This field determines the type of video playout. The Playout type options
are PTS (Presentation Time Stamp) or VBV (Video Buffering Verifier), but default PTS will
be selected.
"NOTE: When Program Tuning Mode is set to PID Select, it is possible to select any
audio from any service with the transport stream.

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3.3. PROGRAM INFO
Figure 3-4: VistaLINK®PRO – Program Info
3.3.1. Program Monitor
•Program Number in TS: The currently decoded Program ID is displayed here in decimal form.
•PMT PID: The currently decoded Program Map Table Packet ID is displayed here in decimal
form.
•PCR PID: The Program Clock Reference Packet ID is displayed here in decimal form.
•Num Video Streams: The number of video streams within the program is displayed here.
•Num Audio Streams: The number of audio streams within the program is displayed here.

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3.3.2. Video Monitor
•Video PID Number: The currently decoded Video Packet ID is displayed here in Decimal form.
•Video Bitrate: The current video bitrate is displayed here; this value will be variable for video
encoded in VBR.
•Video Resolution: The currently decoded video resolution will be displayed here; this is read
from the PSIP/PSI.
•Video Profile and Level: The currently decoded video profile will be displayed here; this is read
from the PSIP/PSI. This will either be MP@ML or MP@HL.
•Video Chroma Format: The currently decoded video resolution will be displayed here; this is
read from the PSIP/PSI. This will either be 4:2:0 or 4:2:2.
3.3.3. Audio 1/2/3/4 Monitor
•PID Number: The currently decoded Audio Packet ID is displayed here in Decimal form.
•Bitrate: The current Audio bitrate is displayed here.
•Audio Type: The currently decoded video resolution will be displayed here; this is read from the
PSIP/PSI.
•Sampling Rate: The currently decoded Audio Sampling rate will be displayed here; this is read
from the PSIP/PSI.
•Num Channels: The number of channels of Audio in the currently decoded program will be
displayed here; this is read from the PSIP/PSI.

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3.4. OUTPUTS
Figure 3-5 VistaLINK®PRO - Outputs
3.4.1. AC3 Decoder Assignments
•AC3 Decoder 1/2: The 7880DEC-MP2HD-2 can decode two AC3 streams per input. AC3 can
be set for decode or bypass onto the outbound SDI. The selection can be made for AC3
assignment, Group1 AES1/2 and Group2 AES1/2. The professional stereo mix is preformed
when decoding. The original AC3 feed is embedded to video when bypass is selected.
3.4.2. Embedding Audio Source
•Group 1/2/3/4: The 7880DEC-MP2HD-2 automatically embeds the selected audio streams into
the outgoing SDI. Here it is possible to re-arrange the audio streams and/or embed other
separate audio streams. Simply select for each Group, which Audio should be embedded.

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3.4.3. Embedding Audio Delay
•Group 1/2/3/4: The 7880DEC-MP2HD-2 card automatically embeds the selected audio streams
into the outgoing SDI. It is possible to add an additional delay to synchronize the audio and
video stream. Simply slide the audio delay to the desired setting for each audio group. The
maximum delay is 500ms.
3.4.4. Misc. Control
•Output Video Mode: Options are continuous or discontinuous. When in continuous mode and
the user switches between inputs, the output will not be dropped between sources, the output is
thus continuous. In discontinuous mode the output, when switching between inputs, will drop
momentarily.
•Output Standard: Options are Native, 525i/59.94, 625i/50, 720p/59.94, 1080i/59.94 and
1080i/50.
•Output Video Colour: Options are Black or Blue, this is the colour that will be output when the
input is lost.
"
NOTE: Using Blue is a good compliment to the Evertz MVP/VIP systems, which by
default, use Green to signify loss of the input. Thus a blue screen will indicate a
loss of source at the encoder, not at the MVP/VIP.
•CC608 Embed: This allows the user to decide if Closed Caption 608 should be embedded on
the output, by default this is disabled.
•CC608 Embed Line Number: This allows the user to select the line at which the closed
captions will be embedded; the range is line 7 to 21.
•CC708 Embed: This allows the user to decide if Closed Caption 708 should be embedded on
the output, by default this is disabled.
•CC708 Embed Line Number: This allows the user to select the line at which the closed
captions will be embedded; the range is line 7 to 21.