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What Is Digital Headend Or Cable TV Headend

digital headend or cable headend

Introduction  Of  Digital  Headend

Basically a headend is server which receive the signal from the dishes then decodes , multiplex , encodes and then transmit it via modulators.

Traditionally we were using the Analog Headend with limited number of services. Number of channels were increasing day by day but there was no any solution. Then the term came Digital Headend.

A Digital Headend system is a new revolution in cable TV industry. Digital Headend changed the whole phenomenon of cable TV industry by increasing the number of services. A large number of services can be run on a digital headend. Aslo digital headend system reduced the bandwidth use with better pitcher quality. Also digital headend enable us to provide more services rather than channels like Radio Services , Games and VOD etc.

Digital  Headend System  Vs  Analog  Headend System

In 860Mhz bandwidth is the maximum channels we can deliver is 106. But as we all knows channels are growing continuously and to provide all of these channels via analog headend is not possible that is why we need to go for compression techniques to provide maximum number of services to our subscribers.

Digital  Headend System Benefits

MPEG-2 Compression Benefit

MPEG-2 compression is a digital format. MPEG-2 compression system recorders only those part of pictures which are changes while it did not records the repeated pictures.

Thus by excluding the repeated pictures it reduces the bandwidth space. This is how MPEG -2 system works.

One analog channel consumes the 7Mhz frequency approximately in which by using this MPEG -2 compression system we can use approximately 8 TV channels. So we provides maximum data in limited bandwidth. By using this technique we can provide 700 services to our subscribers in 550Mhz bandwidth.

DOLBY Or Stereo Sound Benefit

Traditional analog headend does not support the stereo or dolby sound while digital headend supports the stereo or dolby sound also voice quality is improved in mpeg – 4 compression.

Additional Services

There are many additional services which are provided by the digital headend. These services are

Video On Demand

Radio Services

EPG

Internet service

etc.

These are the additional services provided by the digital headend.

Digital  Headend  Devices

Dishes

Decorders

Encorders

Multiplexrs

Modulators

CAS System

Scramblers

Dishes

digital headend dish

Dishes are used to receive the signals from the satellites and then send this signal to IF section of the headend. There are different dishes used for to receive the signals from different satellites. These may be C-band and Ku-Band dishes.

Decorders

digital headend decorder

Professional IRDs are used in the digital headend to receive the signal from the IF section of the digital headend. These IRDs decode the FTA and Scrambled channels and provide us IP and ASI output.

Encorders

encorder digital headend or cabel tv headend

Encorders are used to encode the signal which we are receiving from the decorders. Basically we use the encorders to convert the Composite signal into ASI or IP signal.

Multiplexers

prostreamer 1000 multiplexer

Multiplexers are used to multiplex the services into single stream. A single stream can have many services that depends on bandwidth. For example prostreamer is used to multiplex and also this device perform the function of remultiplexing.

Modulators

bnsg 9000 modulator

Modulators are used to send the signal at large distance or we can say modulator modulate the signal. We use the QAM Modulation which is called the Quadrature Amplitude Modulation. Also a modulator converts the IP singal into RF signal. Cisco QAM , Harmonic Bnsg QAM are the examples of QAMs to perform these actions.

CAS System

This is called the Conditional Access System. Conditional Access System is used to control the services and the programs.

Scramblers

prostreamer 1000 scrambler

Scramblers are used to scramble a service. This function is performed to protect our data from unknown persons. Scrambler disorder that for protection.

This was all about the Digital Headend System.

   Know  More  About    IP  Headend  Architecture  And  Working

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About

Ujjwal Swami is Founder Of Headend INFO. He is a Entrepreneur and working for Cable Industry. He is also working for STB HD, Go For Tricks And Heterochromia Iridum

14 thoughts on “What Is Digital Headend Or Cable TV Headend

  1. B.Jalander Reddy says:

    my network runing anloge chanels now upgrad todigital control room how much cost of systam

    1. Ujjwal Swami says:

      that depends on how much number of services you are providing and vendor also.

  2. Mrs.molly Fernandes says:

    It’s really interesting to know abut digital I am from Goa so very shortly we r going for digital headend

  3. Vinay mishra says:

    Very shortly and nicely describe

  4. Raj Poonia says:

    What is the price of digital headends of different sarvices

  5. satya kashyap says:

    great info sharing…thanks ujjwal

  6. PRAMOD KUMAR GUPTA says:

    i am cable opretor

  7. md.nayme says:

    sir,
    our 98 channel analog hedean running.now we are set up 128 channel digital heden,but we cannot know how much instrument or expend total cost.please you can send me information.

    your Best regard
    md.nayme
    nirnayme@gmail.com

    1. Ujjwal Swami says:

      Digital Headend is totally different from Analog Headend…only transmitters can be used from your Analog Headend and your modulators will not be applicable for Digital Headend. For 128 channel setup you can use equipments of Gospell Company which contains 1 Gospell QAM (One Card Only) , Gospell PSI Server and Gospell CAS Server, Gospell Encorders, SMS Server, Data & Management switchs. Thus Gospell equipements will be usable for you if you dont want to increase your Headend Cost.

  8. I want to install MPEG 2 Digital Headend with 50 Pay Channels and 50 FTA Channels,
    I will be using Insat 2 e, Asiasat 2 and 3s , Intelsat 17 for the FTA feed.

    What are the Devices used and what will be the Price ?

    Gautam Basneth

  9. Thomas D Feely says:

    This is a great website Ujjwal… I’ve been involved with this technology for 30 years now… about 10 years for the old NTSC Analog and 20 years for ATSC Digital… The article mentions 7 MHz channel bandwidth (Consumes 7MHz) I’m not aware of that? PAL uses 8 MHz and ATSC uses 6 MHz…

  10. razi ahmed says:

    very interesting to get basics of digital headened

  11. K. K. Sharma says:

    I want to install MPEG 2/4 Digital Headend with50 HD Channel, 80 Pay Channels and 200 FTA Channels,
    What are the Devices used and what will be the Price ?
    K. K. Sharma

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