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Analog Cable Tv Headend Architecture or Analog Catv Headend

Analog Headend System

Analog Headend System

Traditionally We were using the Analog Headend system. So in 860Mhz the maximum number of channels which analog headend system supports are 106.

As we all know number of channels are growing day by day. So it was not possible to provide more than 106 tv channels in analog headend system. Then we need to go for Digital Headend System.

But in this article we will describe the Analog Headend System only.

In analog headend system we need to have RF from dishes and then put them into the decoders. These decoders provides the Composite Video Signal. Now instead of encoders we insert this Composite Video Signal into Modulators directly.

                        

These modulators are having different frequencies. Analog headend frequency chart is mentioned below,

PAL B/G FREQUENCY CHART
SR.NO. CHANNEL CARRIERS SL.NO. CHANNEL CARRIERS
VIDEO MHz AUDIO MHz VIDEO MHz AUDIO MHz
BAND I U   H   F
1 E2 48.25 53.75 58 UHF21 471.25 476.75
2 E3 55.25 60.75 59 UHF22 479.25 484.75
3 E4 62.25 67.75 60 UHF23 487.25 492.75
MID BAND 61 UHF24 495.25 500.75
4 X 69.25 74.75 62 UHF25 503.25 508.75
5 Y 76.25 81.75 63 UHF26 511.25 516.75
6 Z 83.25 88.75 64 UHF27 519.25 524.75
7 Z+1 90.25 95.75 65 UHF28 527.25 532.75
8 Z+2 97.25 102.75 66 UHF29 535.25 540.75
9 S1 105.25 110.75 67 UHF30 543.25 548.75
10 S2 112.25 117.75 68 UHF31 551.25 556.75
11 S3 119.25 124.75 69 UHF32 559.25 564.75
12 S4 126.25 131.75 70 UHF33 567.25 572.75
13 S5 133.25 138.75 71 UHF34 575.25 580.75
14 S6 140.25 145.75 72 UHF35 583.25 588.75
15 S7 147.25 152.75 73 UHF36 591.25 596.75
16 S8 154.25 159.75 74 UHF37 599.25 604.75
17 S9 161.25 166.75 75 UHF38 607.25 612.75
18 S10 168.25 173.75 76 UHF39 615.25 620.75
BAND III 77 UHF40 623.25 628.75
19 E5 175.25 180.75 78 UHF41 631.25 636.75
20 E6 182.25 187.75 79 UHF42 639.25 644.75
21 E7 189.25 194.75 80 UHF43 647.25 652.75
22 E8 196.25 201.75 81 UHF44 655.25 660.75
23 E9 203.25 208.75 82 UHF45 663.25 668.75
24 E10 210.25 215.75 83 UHF46 671.25 676.75
25 E11 217.25 222.75 84 UHF47 679.25 684.75
26 E12 224.25 229.75 85 UHF48 687.25 692.75
S U P E R   B A N D 86 UHF49 695.25 700.75
27 S11 231.25 236.75 87 UHF50 703.25 708.75
28 S12 238.25 243.75 88 UHF51 711.25 716.75
29 S13 245.25 250.75 89 UHF52 719.25 724.75
30 S14 252.25 257.75 90 UHF53 727.25 732.75
31 S15 259.25 264.75 91 UHF54 735.25 740.75
32 S16 266.25 271.75 92 UHF55 743.25 748.75
33 S17 273.25 278.75 93 UHF56 751.25 756.75
34 S18 280.25 285.75 94 UHF57 759.25 764.75
35 S19 287.25 292.75 95 UHF58 767.25 772.75
36 S20 294.25 299.75 96 UHF59 775.25 780.75
H Y P E R   B A N D 97 UHF60 783.25 788.75
37 S21 303.25 308.75 98 UHF61 791.25 796.75
38 S22 311.25 316.75 99 UHF62 799.25 804.75
39 S23 319.25 324.75 100 UHF63 807.25 812.75
40 S24 327.25 332.75 101 UHF64 815.25 820.75
41 S25 335.25 340.75 102 UHF65 823.25 828.75
42 S26 343.25 348.75 103 UHF66 831.25 836.75
43 S27 351.25 356.75 104 UHF67 839.25 844.75
44 S28 359.25 364.75 105 UHF68 847.25 852.75
45 S29 367.25 372.75 106 UHF69 855.25 860.75
46 S30 375.25 380.75
47 S31 383.25 388.75
48 S32 391.25 396.75
49 S33 399.25 404.75
50 S34 407.25 412.75
51 S35 415.25 420.75
52 S36 423.25 428.75
53 S37 431.25 436.75
54 S38 439.25 444.75
55 S39 447.25 452.75
56 S40 455.25 460.75
57 S41 463.25 468.75

As you can see above in table there are total 106 channels are available for analog headend system. So there are one particular modulator for one particular frequency.

These modulators are having Composite Video Signal as input and RF signal as output for particular frequency. All the outputs from these modulators are combined together via combiner and then single output goes into the splitter. This splitter split the output for different transmitters.

analog headend system

Analog Headend System Diagram

So transmitters are having RF input and gives Optical Fiber output.These optical fibers are deployed in different locations for Cable Operators.

At the LCO or Operator end we install a NODE. This node takes optical input and gives RF output. We gives Power Supply input also to the node as supply.Thus output of node goes into the amplifiers as input. Then amplifiers amplify the signal and gives amplified output. This output goes into the set up box as RF Input at subscriber end.

This was all about the analog headend system.

 Know  More  About    IP Headend Architecture And Working

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