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DVB-T/T2 terrestrial receiver

MERlin

Using the Web Page



2013 dB Broadcast Ltd

Version 1.2

With MER L1-Post the number of IQ samples and carrier spacing can be selected. The range

of IQ sample points varies depending on the modulation index of L1-Post as shown below.

L1-Post Modulation

IQ Range

Number of IQ samples

Carrier Spacing

64QAM

249

500

16QAM

375

750

QPSK

749

500

BPSK

1499

500

IQ samples vary from 50 to a maximum of 2000. Carrier spacing ranges from 1 to 10.

The UK uses L1-Post 64QAM with 500 IQ samples and a carrier spacing of 1.

If standard MER is selected, IQ Sample Size and Carrier Spacing menus are not present.

Alarm Configuration

There are two relay alarms, critical alarm and non-critical alarm available on the rear connector.

The critical alarm is dedicated to microprocessor failure.

The DVB-T2 non-critical alarm is programmed on the DVB-T2 Configuration tab.

Where alarms have check boxes next to them, they are only enabled by placing a tick in the box.

RF Input Level Alarm

RF Input level sets a minimum and maximum input level before the RF input level alarm is set.

The alarm must also be enabled. MERlin is not a substitute for a calibrated power meter.

MER (dB) Alarm

It is recommended that LDPC mean is used in conjunction with MER.

Frequency Error (kHz)

Frequency error is used to check the input RF signal is at the correct frequency. The frequency

error can be positive or negative and is the difference between the tuned frequency and the

received frequency. Lower and upper range limits are set for frequency error. It is not

recommended to use a value below 30kHz upper or lower frequency error.

MERlin is not a substitute for a precision frequency counter, but it does provide a useful

monitoring facility.

T2 Template.

Click the tick box to create a tick and enable the alarm. When the template alarm is enabled,

the input RF is compared to the template selected on the template tab.

The comparison is made by comparing the T2 signalling with the template settings. If the DVB-

T2 transmitter parameters change the MERlin receiver will automatically follow the input RF.

The template is a shorthand mechanism to check the input DVB-T2. Each template element can

be separately interrogated using the SNMP MIB or the MERlin web page.

LDPC Sample Time

The default LDPC sample time is 60 seconds and the range is 1 to 60 seconds.

Содержание MERlin

Страница 1: ...MERlin DVB T T2 Terrestrial Receiver Handbook Version 1 2...

Страница 2: ...rmation purposes only and does not constitute any form of warranty or guarantee All trademarks acknowledged The information in this document is subject to change without notice dB Broadcast Ltd Regist...

Страница 3: ...DVB T T2 terrestrial receiver MERlin 2013 dB Broadcast Ltd 3 Version 1 2 Document history Date of first publication 16 th March 2011 Current issue and date Version 1 2 Wednesday 15 May 2013...

Страница 4: ...ASI I O 10 REAR PANEL RS232 10 RESET STATUS PORT 11 Critical alarm 11 Non critical alarm 11 Reset 11 TUNING AND CHECKING THE RECEIVER 12 Using the built in Web Page 12 Using the Command Line Interface...

Страница 5: ...ONITORING 33 TS CONFIGURATION 34 Transport stream Monitoring TS Monitoring 36 USING LOGS 37 CONNECTING TO THE WEB PAGE 38 Ethernet port connection 38 PC Set Up 38 Internet Browser 38 THE COMMAND LINE...

Страница 6: ...tion areas in the presence of echoes or within an SFN The receiver has applications in re broadcast transmission systems or for direct monitoring of a transmitter and is particularly suited to relay s...

Страница 7: ...itoring option for Program Association Table PAT and 6 Packet Identifiers PID s Measured parameters for alarms also include RF level receiver lock status standard MER echo resistant L1 Post MER LDPC T...

Страница 8: ...e specified for this product and certified safe for the country of use For pluggable equipment the socket outlet shall be installed near the equipment and shall be easily accessible The rack disconnec...

Страница 9: ...ct damage precautions Take anti static precautions Since this unit contains exposed PCB and electronic components ensure proper anti static precautions are observed when handing this equipment Provide...

Страница 10: ...mpliant transport stream output with nominal 75 impedance ASI OUT 2 ASI OUTPUT 2 As above Rear panel RS232 RS232 9 way D type PIN SIGNAL 1 Not used 2 Transmit data To PC 3 Receive data From PC 4 Not u...

Страница 11: ...ult condition and is controlled by the microprocessor watchdog circuit In the alarm condition the relay is unenergised i e Critical Alarm Common pin 2 is connected to Critical Alarm NC pin 7 In the no...

Страница 12: ...ed for a username and password enter MERlin into both boxes Refer to the Connecting to the Web Page chapter for details of Ethernet setup 4 Power up the MERlin and ensure the green POWER indicator on...

Страница 13: ...nterface Refer to the Command Line Interface chapter for details of the RS232 set up and serial command format for commands used in the following steps 1 Power up MERlin and ensure the green power ind...

Страница 14: ...age return Ex 2 To set a frequency of 474MHz upper offset upper adjacent channel 8MHz bandwidth DVB T2 issue commands as follows FREQ 474166 kHz DVBMODE 2 BANDWIDTH 8 The message INFO Tuned To 474166...

Страница 15: ...ing low level commands from a terminal remotely using Ethernet with the built in Web Page or via SNMP Front panel controls and LEDs The front panel offers local monitoring by means of its LEDs LED Ind...

Страница 16: ...age MERlin has a built in Web Page which obviates the need for a PC based Graphical User Interface MERlin has the following tabs that currently include DVB T Monitoring DVB T Configuration DVB T2 Moni...

Страница 17: ...es otherwise continue to configure settings Changing the DVB mode while using the MERlin output may cause loss of signal ASI Packet Size Select packet size from drop down menu Will be greyed out and r...

Страница 18: ...le SNMP destination s Set the Public and Private Community Names SNMP Community Read Public SNMP Community Write Private Station Identity A user entered fifteen character alphanumeric When the MERlin...

Страница 19: ...er Lock Green receiver locked Red receiver unlocked Alarms Indicator Relay Red relay in fail state RF Input Level Red alarm set MER Red alarm set Frequency Error Red alarm set BER Pre Viterbi Red alar...

Страница 20: ...nts Parameter Description Values Units RF Input Level dBm Reports actual RF input level dBm MER dB Modulation Error Ratio dB Lock Status Indicates if the receiver is locked to the input RF Locked Unlo...

Страница 21: ...ere are two relay alarms critical alarm and non critical alarm available on the rear connector The critical alarm is dedicated to microprocessor failure The DVB T non critical alarm is programmed on t...

Страница 22: ...s is the RF front end tuner temperature which is approximately 25 C higher than ambient Sets minimum and maximum Tuner Temperature enter value and press Set Tick box enables alarm TS Bit Rate Enter th...

Страница 23: ...us Indicator Measurement Mode Green normal Red fail Receiver Lock Green receiver locked Red receiver unlocked Alarms Indicator Relay Red relay in fail state RF Input Level Red alarm set MER standard o...

Страница 24: ...nition GFPS GSE TS Reserved1 28 UNKNOWN Generic Fixed length Packetized Stream Generic Stream Encapsulated Transport Stream 28 Placeholders Not defined PLPs Present The number of PLP s in the modulati...

Страница 25: ...achieve lock kHz Frequency Offset 8 MHz bandwidth Lower None Upper 167kHz 0kHz 167kHz Frequency Offset 7 MHz bandwidth Lower None Upper 125kHz 0kHz 125kHz Frequency Error The difference between the fr...

Страница 26: ...0 10800 10800 8100 8100 8100 8100 Guard Interval 1 32 1 32 1 32 1 128 1 32 1 128 1 128 Pilot Pattern PP7 PP7 PP7 PP7 PP7 PP7 PP7 Extended B W On On On On On On On Tone Reservation On On On Off Off On...

Страница 27: ...the DVB T2 Configuration page The template alarm is found in the T2 Configuration page If the incoming DVB T2 signal does not match the T2 parameters then an alarm is set If the DVB T2 input signal do...

Страница 28: ...RF Parameters The screen background will be blue while parameters are being updated 6 Once editing is complete click on Save again If the editing process is likely to take more than 30 seconds save th...

Страница 29: ...iver in the Installation chapter MER Configuration MER IQ polling can be set to standard MER or MER L1 Post L1 Post provides superior MER measurement in the presence of echoes or within an SFN For use...

Страница 30: ...F input level alarm is set The alarm must also be enabled MERlin is not a substitute for a calibrated power meter MER dB Alarm It is recommended that LDPC mean is used in conjunction with MER Frequenc...

Страница 31: ...t false alarming Once LDPC Mean error has reached 15 a STB will find it difficult to lock to the signal and decode a clean picture Pre LDPC and BCH BER BER is not recommended for monitoring the receiv...

Страница 32: ...PLP Lock States MM RL Notes Receiver Lock Green Green PLP Lock Red Green Receiver Lock PLP not present Red Red Receiver not locked Red Red This is a fault condition A Set Top Box usually attempts to t...

Страница 33: ...identically for transport streams generated either by DVB T or DVB T2 TSM can detect the presence of the Programme Association Table PAT and up to six programmed Packet Id s PID s PAT and PID s prese...

Страница 34: ...r distance is programmable with 10 millisecond granularity up to 60s with a default of 10s Care should be taken not configure too low an upper distance time for PAT which could cause false alarming En...

Страница 35: ...o consecutive packets of the same PID may be significantly longer In principle a different user specified period could be defined for each PID Enable PID Each PID is individually enabled for alarm Tra...

Страница 36: ...is in alarm User Label 0 to 5 Green User PAT is within the Upper Distance time Red Set time has been breached and is in alarm Transport Error Green TEI not asserted Red TEI has been asserted in one o...

Страница 37: ...itoring 2013 dB Broadcast Ltd 37 Version 1 2 Using Logs The Log tab presents events in date order to allow alarm history to be investigated to observe any patterns that may emerge over time The log en...

Страница 38: ...n the Internet Protocol Version 4 TC IPv4 properties deselect Obtain an IP address automatically i e DHCP and select Use the following IP address 192 168 0 101 Set the Subnet mask to 255 255 255 0 If...

Страница 39: ...mation and pin out Before initiating remote control set the PC serial port as follows Speed 115200 baud Decoder protocol 1 start bit 8 data bits no parity 1 stop bit Interface RS232 Handshaking RTS CT...

Страница 40: ...xxx MACADDR maccaddr Requests MAC address DHCP dhcp Requests current DHCP state on off dhcp value Sets dhcp in the form on or off DVBMODE dvbmode Request current DVBMODE dvbmode 1 or 2 Sets the DVBMO...

Страница 41: ...s the MERlin to reboot CLEARLOG clearlog Clears the log RFS This was introduced to allow easier characterisation of the daughter board and reports a summary of the RF status duplicating several of the...

Страница 42: ...ommunity string Use snmpcom 0 public to set SNMP community to public Use snmpcom 1 private to set SNMP community to private HELP help command Requests usage help command name provided VER Ver Requests...

Страница 43: ...ency Error 255 255 LDPC Sample Time 60s LDPC Mean Error 15 LDPC Mean Warning 15 LDPC Iteration 15 Pre LDPC BER s 7 5e 2 Ore BCH BER s 7 5e 2 Tuner Temperature 127 127 TS Bit Rate Mb s 0 0 51 1875 TS S...

Страница 44: ...te 1 0 10 0 Disabled Pid Test5 User Defined 1 Disabled Transport_error Device Configuration System Setting Default DVB Mode DVB T2 ASI Packet size 188 ASI Mode Burst Set time HH MM BST factory set Set...

Страница 45: ...o the correct frequency LDPC Iterations 7 the RF input signal is it low amplitude or subject to interference LDPC 15 the input RF is extremely poor and on the point of failure MER 20dB poor input sign...

Страница 46: ...gnitude of variation in a changing quantity from its zero value ASI Asynchronous Serial Interface Attenuation A reduction in power It occurs naturally during wave travel through lines waveguides space...

Страница 47: ...ed extensively in European digital television DVB T and digital radio DAB systems dB Decibel A logarithmic unit used to describe signal ratios For voltages dB 20 Log10 V1 V2 DID Data identifier DTV Di...

Страница 48: ...econd 10 6 cps MPLP The DVB T2 Multiple Physical Layer Pipe MPLP allows multiple PLP s to be present in the DVB T2 modulation The DVB T2 allows for up to 256 PLP s to be defined Modulation A process t...

Страница 49: ...the modulation process RS Reed Solomon SNR Signal to Noise Ratio Symbol Rate Replacement term for Baud a unit of signalling speed the number of times a signal on a communications circuit changes Termi...

Страница 50: ...2K 4K 8K 16K 32K Measured Parameters DVB T2 Template T2 Frames per superframe FEC block Length Constellation of L1 Post signalling Carriers Constellation of PLP Tone Reservation Scattered Pilot patter...

Страница 51: ...e 89 336 EEC and 92 3EEC for Electromagnetic Compatibility Compliance was demonstrated to the following specifications as listed in the Official Journal of the European Communities EC Declaration of C...

Страница 52: ...DVB T T2 terrestrial receiver MERlin 2013 dB Broadcast Ltd 52 Version 1 2 Ordering information MERin s Standard unit with single PSU MERlin odc Digital monitoring Option...

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