Terra MMH3000 User manual

DVB-T/T2 to DVB-T transmodulator ttx312
1. Product description
The ttx312 is DVB-T/T2 receiver with DVB-T modulator and transport stream remultiplexer with transparent modulator
option. It is intended to receive DVB-T/T2 signal, restore lost data (if still technically possible) and modulate the signal again
into DVB-T RF channel. It can also be used in multiplexed mode (lter services or modify parameters of transport stream).
Transmodulator is intended to use in the MMH3000 headend.
ttx312 is designed in accordance with standard EN60728-5 grade 2.
The unit is intended for indoor usage only.
2. Safety instructions
Any repairs must be performed by a qualied personnel.
Module shall not be exposed to dripping or splashing water and no objects lled with liquids, such as vases, shall be
placed on it.
Avoid placing module next to central heating components and in areas of high humidity.
No naked ame sources, such as lighted candles, should be placed on module.
If the module has been kept in cold conditions for a long time, keep it in a warm room no less than 2 hours before plugging
into the mains.
The ventilation should not be impeded by covering with items, such as newspapers, table-cloths, curtains.
3. External view
[1] - ADDRESSED - indicator of addressing
[2] - STATUS - indicator of module's status
[3] - MPEG2 TS - TS output connector
[4] - RF input of DVB-T signal, preamplier powering
[5] - RF loop through output
[6] - xing screws
Figure 1. External view of the module
4. Installation instructions
Read the instruction rst.
Disconnect base unit from the mains before insertion/changing the module. How to insert module into the base unit, see
user manuals of base units UC360, UC380, chapter ''INSERTION/CHANGING OF THE MODULE''.
RF input signal can be connected directly to [4] connector, or via loop through outputs of other modules.
Any other module's DVB-T RF input (or analog TV RF input) can be connected to ttx312 loop through output [5].
Comments of the front panel indicators:
[1] ADDRESSED indicator. Indicator lights green when the module is addressed on Terra Bus bus. Blinking indicator
indicates addressing error.
[2] STATUS indicator. In case of any error indicator lights red. It will start blinking at power on to indicate a starting up status.
The module is ready when indicator blinking stops.
Draugystes str. 22, LT-51256 Kaunas, Lithuania, tel.: +370 37 - 31 34 44, fax: +370 37 - 31 35 55
E-mail: [email protected], http://www.terraelectronics.com
8. Technical specications
RF output parameters
Modulation DVB-T QPSK, QAM16, QAM64
Bandwidth 7 MHz, 8 MHz
Guard interval 1/4, 1/8, 1/16, 1/32
Code rate 1/2, 2/3, 3/4, 5/6, 7/8
Mode 2k
RF output frequency 110...860 MHz by 0.5 MHz step
RF offset (7 MHz) -125 kHz, 0, +125 kHz
RF offset (8 MHz) -166 kHz, 0, +166 kHz
Attenuation 0...15.5 dB by 0.5 dB step
Output level, typical 90 dBμV ±1.5 dB
Carrier stability ± 500 Hz
MER ≥ 35.0 dB
Output impedance 75 Ω
RF input parameters
DVB-T modulation QPSK, QAM16, QAM64
DVB-T2 modulation QPSK, QAM16, QAM64, QAM256
Input frequency 104 ... 862 MHz
Input level 40 ... 100 dBμV
Input impedance 75 Ω
Loop through gain 0 ... +3.5 dB
Signal/Noise ≥ 23 dB
Multiplexing parameters (multiplexed mode only)
Input bit rate ≤ 31.5 MBit/s
Output bit rate ≤ 31.5 MBit/s (modulator bandwidth limited)
Input services ≤ 256
PID lter ≤ 256
Version
monitoring
PMT Yes
PAT No
SDT No
PCR restamping Yes
EPG (EIT) multiplexing Yes
Other parameters
Supply voltage 5.5 ± 0.1 V
Current consumption 1.3 A
Supply voltage for preamplier 12 V 0.1 A, max.
Operating temperature range see UC360, UC380 manuals technical characteristics
Dimensions /Weight 47.5 x 117 x 220.5 mm / 0.7 kg
Mini modular headend MMH3000
Vers. 1.01
MPEG2 TS
ADDRESSED
STATUS
ttx312
MMH
series
headend
DVB-T/T2
DVB-T
transmodulator
®
TERRA
4
3
5
1
2
6
Caution.
Electrostatic discharge caution. The module contain electrostatic sensitive components. To minimize electrostatic
discharge, observe the following precautions:
- Do not remove module from their antistatic plastic bag until you are ready to install it into the basic unit.
- Hold the module only by the front panel of module.
- Do not place the module on an unprotected surface. Immediately after you remove a module from the
basic unit, you must insert it into its antistatic plastic bag.
- When the module is not in use, keep it in their antistatic plastic bag.
- Do not ship or store module near strong electrostatic, electromagnetic or radioactive elds.
This product complies with the relevant clauses of the European Directive 2002/96/EC. The unit must be recycled
or discarded according to applicable local and national regulations.
Equipment intended for indoor usage only.
TERRA conrms, that this product is in accordance to following norms of EU: EMC norm EN50083-2, safety norm
EN60065 and RoHS norm EN50581.
TERRA conrms, that this product is in accordance with Custom Union Technical Regulations: “Electromagnetic
compatibility of technical equipment“ CU TR 020/2011, “On safety of low-voltage equipment“ CU TR 004/2011.

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5. Default settings
DVB-T receiver parameters:
- Modulation standard: DVB-T
- Input Frequency, kHz: 474000
- Bandwidth, MHz 8
DVB-T modulator parameters:
- Modulation QAM64
- Bandwidth: 8 MHz
- Guard interval: 1/32
- Code rate: 7/8
- Cell ID: 0
- RF: Off
- Saw lter: Off
- RF Frequency: 474 MHz
- RF Offset: 0 kHz
- Attenuator: 0.0 dB
OFDM Output stream parameters (in multiplexed mode only):
- Transport Stream ID: 1
- Network ID: 1
- Network Name: none
- Date/Time source: DVB-T/T2 Input
- Timing zone: 0 GMT
- NIT: Disabled
- EPG Multiplexing: Enabled
6. Operating
Device receives DVB-T signal and outputs transport stream to connector [3] transparently (without any modication). This
signal can be connected to other devices of MMH headend, which accepts TS.
In case of multiplexed mode, system processes incoming transport stream (measures bitrate, generates PSI, lters
services, restamples PCR, multiplexes EPG) and passes to modulator. System monitors PMT tables (up to 32) and updates
the output of multiplexer if any changes detected (for example: new stream detected, new descriptors added or removed).
In case of transparent mode, incomming transport stream passes directly to modulator without any modication of transport
stream. Only PCR restamping is turned on in this mode.
All parameters can be setup via user friendly graphic interface, which supports Terra Link, CMH Master software. "Home"
tab of ttx312's control panel will appear when device was selected (see corresponding software user manual). See Figure 2.
Figure 2. Home tab of ttx312 control panel
Three sections exist on this page. "Input channel" table shows parameters of incoming transport stream (DVB-T demodulator).
"Signal status" shows transport stream detection status. "Bit Rate" shows bit rate of incoming transport stream.
"Output channel" table shows parameters of outgoing transport stream. "Max. Bitrate" - this is the maximum available
output bit rate according to OFDM modulation parameters (code rate, guard interval, etc). "Current Bitrate" shows bitrate
of outgoing transport stream. "Used bandwidth" value is calculated from previous two values, and indicates the percentage
of used bandwidth.
NOTE: Ensure that used bandwidth would not exceed 95%. Otherwise bit rate overow would occurs. In case of bitrate
overow error, indicated bitrate values will be inaccurate because a device can not measure bitrate in such error condition.
"System status" table indicates main information about the device (device name, serial number, software and hardware
version, internal temperature, system time). This table also will show all errors of device operation.
Device has internal clock, and a value 1970.01.01 00:00:00 will be assigned after system startup. The clock will be updated
automatically from transport stream TDT table.
Information on this page is updated automatically in real time.
Input stream => Rescan
Command will erase previous list of services, and rescan new list. After scanning, all services are disabled. Each service
must be enabled individually.
Input stream =><List of services>
"Enter" key will toggle selection of the service. If the second character has "^" sign, it means that the service is selected.
Otherwise it is disabled.
Input stream => Save & Run
Will save all information, generate all SI tables and run with new settings.
Input Params => Input Freq.
DVB-T input frequency, kHz.
Input Params => Input Bandw.
DVB-T input channel bandwidth (7 or 8 MHz).
Input Params => Preamp. Power
DVB-T input antenna powering On/Off.
OFDM Params => Modulation
Allows to select the modulation (constellation) between QPSK, QAM16 and QAM64.
OFDM Params => Bandwidth
Allows to select the bandwidth of the RF output between 7 and 8 MHz.
OFDM Params => Guard Interval
Allows to select guard interval between 1/4, 1/8, 1/16 and 1/32.
OFDM Params => Code Rate
Allows to select code rate between 1/2, 2/3, 3/4, 5/6 and 7/8.
OFDM Params => Cell ID
Allows to enter Cell ID value 0..65535.
OFDM Params => RF
Allows to turn On / Off RF of modulator.
OFDM Params => Saw lter
Allows to turn On / Off saw lter of intermedium frequency. Parameter can be actual if analog TV channel is adjacent
to OFDM channel.
OFDM Params => Out. Frequency
Allows to setup output frequency of modulator.
OFDM Params => RF Offset
Allows to setup RF offset of modulator. ±166 kHz for 8 MHz bandwidth, and ±125 kHz for 7 MHz channel.
OFDM Params => Attenuator
Allows to setup RF attenuation in a range of 0..15.5 dB.
Network Params => Stream ID
Stream ID value. Requires to execute "Save & Run" command from "Input Stream" menu.
Network Params => Network ID
Network ID value. Requires to execute "Save & Run" command from "Input Stream" menu.
System Status => List of Errors
Shows all errors of the systems. Use "Up" and "Down" buttons to review all of them.
System status => Input status
Shows input bitrate and C/N. It also shows RF level if tuner is unlocked.
System status => Output status
Shows output bitrate and the usage of available bandwidth
System Info => Product
Shows the name of the device.
System Info => Serial Number
Shows serial number of the device.
System Info => Soft. Version
Shows software version of the device.
System Info => System time
Shows system time of the device. NOTE: timing zone and date/time source must be setup correctly. These settings
available only with PC control software.
System Info => Temperature
Shows internal temperature °C of the device.

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Figure 3. "DVB-T Input" section of ttx312 control panel
DVB-T Input section (see gure 3) allows to setup RF reception parameters, displays status of demodulator.
"Modulation standard" - selection of DVB-T or DVB-T/T2 standard.
"Input Frequency" - The frequency of RF input signal. Dimmension - kHz.
"Bandwidth" - The bandwidth of DVB-T input channels. Possible values: 7 MHz, 8 MHz
"Preamplier Powering" - +12 V Preamplier Powering On/Off
"DVB-T receiver status" shows the status of demodulator. Device measures signal level, signal/noise ratio and shows
other information of transponder (modulation, guard interval, code rate, mode).
In case of DVB-T2, "Active PLP" parameter will appear in the receiver status table. The combobox will list all PLPs found
in the channel. Select the PLP to switch it's stream to the modulator.
DVB-T Input / Stream section (Multiplexed operating mode only)
Figure 4. "DVB-T Input / Stream" section of ttx312 control panel
This is a transport stream multiplexer section of device, which is available in "multiplexed" mode only (see "DVB-T Output"
description). Valid transport stream must exists (DVB-T demodulator must be locked) to start working with this section. "Load
streams" button will load information of the stream. All found services will be listed below the button. Lock symbol at the
beginning of service name indicates that a service is scrambled. Next icon represents the type of service. Following icons
are possible:
- High denition television
- Standard denition television
- Radio
Unidentied service types will not have any icon.
NOTE: Lock sign only identies a ag of SDT table, and does not check the content itself.
Check "Enable" checkbox and press "Enable services" to pass that service to modulator. After few seconds a service will
be activated and passed to modulator.
NOTE: Press "Home" tab to see used bandwidth of selected services. Ensure that it takes not more than 90-95% of
available bandwidth, and no any bitrate overow errors are there.
Press sign if you want to see or change more details about the service. New area with information about the service
will be expanded. See Figure 5.
Exact broadcasting parameters must be written for selected stream.
All streams (modulators) must be described here and all other modulators must have the same description table.
NOTE: Only terrestrial descriptor has user-friendly editor. All the reset descriptors can be added in hex format only. Values
must be added according to EN 300 468 standard, starting after descriptor_length eld. descriptor_tag and descriptor_length
will be added/calculated automatically.
NOTE: This descriptor for current modulator (current transport stream) is generated automatically according to modulation
parameters. User must take care only about the rest transport stream descriptions.
Spaces between hex values can be added, but it is not necessary.
Press "Save and RUN" when all NIT modications are done.
Logical Channel Descriptors can be added into the 1st section of NIT, which represents services of current stream only.
"Selected channels" table has a list of all currently enabled services. If "Log. channel" eld is other than zero, a LCD (Logical
Channel Descriptor) will be added for that channel.
LOGs section
Figure 9. LOGs section of ttx312
All errors or most important events will be logged in this section. "Erase log" button allows to clear all logs.
20 records per page can be displayed. Page selector will appear on the screen if more than 20 records are in the system.
This page will be refreshed automatically when a new event occurs in the system.
"Download log" link allows to download all log records from the system as a text le.
NOTE: This feature works with Terra Link starting from 1.6.0 version or CMH Master starting from 1.0.3.0.
7. Handheld control unit
Handheld unit allows to control the most important parameters of the device.
Select the ttx311 device (see user manual of handheld unit). "Control" menu item will appear. Menu tree will appear on
the screen. The rst character ">" marks currently selected menu item. Some menu items has "^" character in the second
position of the line. It means that current menu item is checked.
Use "Up" and "Down" buttons to surf through the menu. Use "Enter" key to enter into deeper submenu or execute the
command associated with it. "Esc" key will exit to upper menu or cancel the execution of a command.
ttx312 has the following menu tree:
Input streams
Input params
OFDM params
Network params
System status
System info
Rescan...
List of services
SAVE & RUN
Input freq.
Input bandw.
Preamp.power
Modulation
Cell ID Out.frequency
Bandwidth
RF RF offset
Guard interval
Code rate Saw lter Attenuator
Stream ID
Network ID
List of errors
Input status
Output status
Product
Serial number System time
Soft. version Temperature

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In case of transparent mode original NIT (if any) will be passed to the output.
Other parameters:
Operating mode - this parameter switches device between two operating modes - transparent or multiplexed mode.
In case of transparent mode, original transport stream passes to modulator without any modifycations. Transparent
operation mode supports 2k and 8k modulation modes.
In case of multiplexed mode all multiplexing features are enabled (NIT generation, service ltering). Modulator can work
in 2k modulation mode only in multiplexed case.
A device will be restarted after switching this parameter, and will start operating after 10 seconds.
"Timing zone" selection used for system clock only, and it does not affect the output stream. This parameter exists in both
operating modes, but in case of multiplexed mode, the parameter is moved to "DVB-T Output/Stream" control panel.
DVB-T Output / Stream section (Multiplexed mode only)
Figure 7. OFDM Output/Stream parameters of ttx312
Output stream parameters can be congured in this section. The most important parameters are Stream ID and Network
ID. User must ensure that Network ID number is identical in all broadcasting equipments, and Transport stream ID must be
unique for every modulator or other streaming equipment.
“Private Data Specier” eld optionally can be used to identify the broadcaster or country. It should be assigned according to
EN 101 162 specication. All allocated values can be nd here: http://www.dvbservices.com/identiers/private_data_spec_id
Hexadecimal value should be entered here. The descriptor will be used together with LCN descriptor. If unsure - enter
zero. In that case the Private_Data_Specier will not be used at all.
"Network Name" used in NIT (Network Identication Table) and it represents broadcaster.
"Date/Time source" selects the source of the clock. TDT (Time and Date Table) will be passed to the output from selected
source. Also a system clock will capture current time values from this source.
"Timing zone" selection used for system clock only and it does not affect the output stream. TOT (Time Offset Table) is
passed transparently to the output from selected source, which carry timing zone information to the end-user.
"NIT Enable" parameter allows to turn On/Off NIT generation.
"EPG Multiplexing" parameter allows to turn On/Off multiplexing of EPG (Electronic Program Guide). The system will
multiplex EPG (EIT) if this parameter is turned on. EPG multiplexing part takes original EIT (Event Information Table),
modies StreamID, NetworkID values, and sends the stream to the output of multiplexer. EIT will be passed (multiplexed)
for enabled services only.
New button "Save and RUN" will appear if any value of this section was changed. Press it to save all changes and run
the system with modied values.
Next important part of this section is NIT conguration. Broadcaster can describe whole network there, so receivers (TV, set-
top-boxes) will be able to scan all channels automatically. The most important note to remember - Network ID number must be
identical in all broadcasting equipments and Transport stream ID must be unique for every modulator or other streaming equipment.
Enter NetworkID and StreamID values in "New Stream Description" table to start describing a stream (the output of each
modulator in the system). New empty record for that stream will appear above that table. Press sign to expand a description
and add all necessary descriptors for that stream. Select a descriptor (probably only "terrestrial_delivery_system_descriptor"
will need) from the list and press "Create new descriptor" button. New empty descriptor will be added. Press onto again
to expand stream description. New inserted descriptor will be found. Press onto to edit it's values (see Figure 8).
Figure 8. Terrestrial descriptor
Figure 5. Service details
List of all streams and other parameters will appear. Some streams will have icons, which indicates the type of the stream.
Following icons are possible:
- Sound stream - Teletext
- DVB Subtitles - Video
A language code will be visible in round brackets if presented in the stream.
A lock sign identiers conditional access streams, which affects a stream or a whole service (like in example above).
Most of the streams of the service can be disabled (ltered) by unchecking "Enabled" check box.
The service name and service provider name can be changed here.
"Monitoring" check box turns on monitoring of PMT version changes. If it is checked, new PMT table will be reloaded if
the version of the table is changed. New appeared streams will be added to the service automatically. Disappeared streams
will be removed from the service as well. The device does not take into account possible bit rate overow of new multiplex.
User must take care about it. Use this feature only in case if it is necessary. If unsure, leave it unchecked.
"Scrambled" ag can be switched on/off. If the ag is off, SDT table will be generated without "scrambled" ag and all CA
descriptors will be removed from the service.
Press "Update program information" button to modify details of the service.
Device will try to leave Service ID and PIDs original if there are no any PID conicts. However, user can modify this
information manually. Check “Other ID” or “Other PID” checkbox to enter new information. In this case, user is responsible
to enter correct PID and service ID to avoid any PID conicts with other services in a multiplex.
NOTE: "Enable services" button will need to be pressed to save all the changes and for them to take effect.
DVB-T Output section
Figure 6. OFDM parameters of ttx312 control panel
There are three tables in this section - modulator parameters, RF parameters and other parameters.
Modulator parameters:
Modulation - modulation type. Possible values: QPSK, QAM16, QAM64
Bandwidth - 7 or 8 MHz
Guard interval - 1/4, 1/8, 1/16, 1/32
Code rate - 1/2, 2/3, 3/4, 5/6, 7/8
Cell ID: - Any value 0..65535 can be entered.
Mode: - 2k/8k (2k only in case of multiplexed operating mode)
RF parameters:
RF On/Off - Allows to switch RF On or Off at the output
Saw lter - Enable or disable 8 MHz (or 7 MHz) bandwidth saw lter's at intermediate (36 MHz) frequency. If
the frequency offset ±166/125 kHz is used, a lter will be switched off automatically.
RF Frequency - Output frequency of modulated COFDM signal. Step - 0.5 MHz.
RF Offset - Output frequency offset ±166 kHz or ±125 kHz in 7 MHz bandwidth case.
Attenuator - RF Output attenuation in 0.0 .. 15.5 dB range.
NOTE: terrestrial_delivery_descriptor in NIT will be changed automatically after a change of any modulation parameters
in multiplexed operating mode. Open "DVB-T Output/Stream" tab and press "Save & Run" to save new values of descriptor.