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Hdb3 encoding calculator

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The following table shows the encoding rules for HDB3. For each logical 0 (zero), nothing to do: 0 is coded, and for each logical 1 (one), a polarity impulsion is coded: alternatively The specific algorithm of BCC is: After each byte of data is XORed sequentially, the check code is finally obtained. Legend. The one for 1. 5. It is also very For the video, things are different and somewhat simpler. Streaming at a higher resolution like 1080p requires a higher bitrate, and a higher frame rate takes more encoding power. AVC codec support. 3MP=30. , VCD, Blu-ray, etc. From unknown past. Base64 encode/decode was ported from a Java Base64 encoder/decoder. Open the Licensing Program drop-down menu and select CSP. The last element of the filling sequence is a code violation, with the 2 middle elements 0’s. • The direction of the mid-bit transition represents the digital data. The history of HDB3 is. HDB3 encoding is a derivative of AMI (Alternative Mark Inversion) encoding. Output format. e. At this scale, dual parity uses RS (2 + 2) encoding which has 50% efficiency. HDB3 and related ternary codes with reference to broadcast signal distribution T. This means a logical one is transmitted as energy and a logical zero is not. Use this converter to estimate the size of an image file as you adjust the on-screen image size (in pixels), bit depth (8 bits per byte) and printed dots per inch (dpi). Many of our storage drives can’t even write to a disk that fast. Previous Tool: Adler32 checksum calculator. 0xFFFF - Character block. 2 Waveform shape Requirement: The pulse at the output port shall comply with the requirements given in table 2 and figure 2, based on CCITT Recommendation G. An integrated Adaptive Equalizer is available to increase the receive sensitivity and enable programming of LOS levels. XOR calculation: 42 xor 43 xor 43 xor 58 xor 4F xor 52 = 07. In transmit path, there is an AMI/ B8ZS/HDB3 encoder and Waveform FAQ How is the storage calculated? You choose the maximum quality level you want to provide, we calculate storage for each quality level. HDB3 code encoding MATLAB: Draw the user-specified 01 sequence diagram and calculate its corresponding AMI code, bi-phase code and CMI code Communication Theory --- FPGA --- HDB3 decoder Calculate the minimum bandwidth required to achieve this if the signal is transmitted using: (i) NRZ (ii) HDB3 (iii) Manchester Encoding Explain your answer in each case. The vlsi architecture of the hdb3 encoder is implemented in verilog hdl and the proposed design is synthesized and the results are compared with different tsmc technology libraries. rwxrwxrwx) to see its value in other formats. 00 2000 25. duobinary encoding A duobinary encoder (and decoder) is included in the line code modules. To explicitly configure HDB3 line encoding, include the linecode statement in the interface configuration for the serial device: service-module e1 linecode hdb3 You can configure AMI line encoding as an alternative. , M. Duobinary encoding is also called correlative coding, or partial response signalling. How to use. 00 2000 29. HDB3 Encoding Rules. 2. Check the desired boxes or directly enter a valid numeric value (e. But in the picture, the blue 1 is -. Eng. 1,543. Adler-32 is a simple checksum algorithm, this algorithm is faster than the CRC algorithm, but the security is not as good as CRC; Adler32 algorithm makes a trade-off between security and speed. Fix the bug with auto leveler; apply new encoding algorithm for the coming patch. Separate between 1. Generally, most messages use the standard of GSM-7 encoding, and have up to 160 characters per segment. Input. The calculator displays results as binary/decimal or hexadecimal memory dump. We are going to need around 540GB per hour for the raw footage. You can find a short description of Unicode and UTF-8 below the calculators. 00 1000 Yes these somewhat hacky but will work. As for the codec: H. to encode the Swedish characters åäö with utf-8 and then decode them with iso-8859-1, or try to encode Character encoding conversion. I am trying to understand HDB3, and in particular trying to find out whether the picture below which shows the encoding of a bitstring in HDB3 is correct or not: From what I understand, a 1 will have the opposite polarity to the last 1. A. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. April 1, 2021. To calculate the joined data, first add the joined tables or layers to the map. For each logical 0 (zero), nothing to do: 0 is coded, and for each logical 1 (one), a polarity impulsion is coded: alternatively The E-carrier system uses a similar line coding scheme called high density bipolar order 3 (HDB3), also a modified form of AMI, in which runs of 4 binary zeros are replaced with an alternate bit pattern. At 30 frames per second, a raw HD video will need 5MBx30 = 150MB storage space per second. 98 2002 24. Hash Calculator Online lets you calculate the cryptographic hash value of a string or file. hdb3 encoding pdf Posted On April 14, 2021 Modified AMI codes are a digital telecommunications technique to maintain system In order to preserve AMI coding’s desirable absence of DC bias, the number of the high density bipolar of order 3 (HDB3) code replaces any instance of 4. 1. The Brivo Card Calculator translates hexadecimal values into readable card format information, providing the internal card number, facility code, and card format. 225,000 minutes per year. Some notations use +1 and -1 (instead of + and -) but the vast majority of the time, the 1 is ignored as, it is implied. License. When calculating joined data, you cannot directly calculate the joined columns. 703, and a HDB3/HDB2/B3ZS Decoder that converts P and N pulses into NRZ data according to ITU-T G. This calculator can be used to compute a variety of calculations related to bandwidth, including converting between different units of data size, calculating download/upload time, calculating the amount of bandwidth a website uses, or converting between monthly data usage and its equivalent bandwidth. BCC check code: 07. An alternative approach, duobinary encoding, was invented by Lender 1. 3MP resolutions. Here, you can simulate what happens if you encode a text file with one encoding and then decode the text with a different encoding. Note: HDB2 and B3ZS are different names for the same encoding. At the start of each bit time, the signal level goes high if the bit is 1, then returns to normal in the middle of the bit time. HDB3 line coding is the ITU answer to the 1s density problems associated with phase locked loop (PLL) circuits. 161 – 306 characters – 2 segments and charged as two messages. 26 Quantization and encoding of a sampled signal. The hex values (for non-proprietary card formats) that can be calculated are Standard 26 Bit, Generic 33 Bit, 34 Bit (even or odd parity), HID Corporate 1000 35 Bit, 37 Bit (with or The Streambox Windows Software Encoder is designed to give users the ability to deliver high quality HD, SD, and 360 video from the field using Windows based computers. when sending e-mail attachments. 0xFFFF - Non GSM-7 character block. The encoding rules follow those for AMI, except that a sequence of four consecutive 0's are encoding using a special "violation" bit. All assume the same starting conditions: The encoding rules follow those for AMI, except that a sequence of four consecutive 0’s are encoding using a special “violation” bit. The compression ratio is the ratio between two elements: the gas volume in the cylinder with the piston at its highest point (top dead center of the stroke, TDC), and the gas volume with the piston at its lowest point (bottom dead center of the stroke, BDC) BASE64 is a data encoding algorithm, which uses 64 alphanumeric characters. Base64 encode/decode was ported to Macromedia Actionscript. E. To view an estimate with CSP pricing and offers, sign in to the Azure pricing calculator using the same credentials you use to sign in to Partner Center. Hi. The oxidation state of an atom is the charge of this atom after ionic approximation of its heteronuclear bonds. 94 1001 60. To calculate oxidation numbers of elements in the chemical compound, enter it's formula and click 'Calculate' (for example: Ca2+, HF2^-, Fe4 [Fe (CN)6]3, NH4NO3, so42-, ch3cooh, cuso4*5h2o ). Encoding Base. The purpose of this is to prevent long runs of 0's in the data stream which may otherwise prevent HDB3 Line Encoder Simulation. HDB3 is typically used to encode As for the codec: H. The hdb3 encoder is designed with the help of v and b modules. HDB3 encoding is a popular technique. Codificacion Hdb3 (https: baseband modulation communications data encoding programa signal processing simulation. Community Treasure Hunt. The pulse amplitude returns to a zero-volt level for a portion (usually one-half) of the pulse or bit 1 function hdb3( bitstream ) 2 %HDB3 High Density Bipolar 3-zeros 3 % sample data: 4 % d = [ 1 1 0 0 0 0 0 0 0 0 1 1 0 0 0 0 0 1 0 ] 5 % usage: 6 % hdb3 (d) 7 % author: 8 % Anastasios Latsas 9 10 % pulse height 11 pulse = 5; 12 13 % assume that current pulse level is a "low" pulse; this is 14 % the pulse level for the bit before given bitstream verilog-HDB3_encoding_and_decoding. HDB3 is typically used to encode Description. The HDB3 code is one of the best representation codes which satisfies all the conditions of AMI and improves the 1 function hdb3( bitstream ) 2 %HDB3 High Density Bipolar 3-zeros 3 % sample data: 4 % d = [ 1 1 0 0 0 0 0 0 0 0 1 1 0 0 0 0 0 1 0 ] 5 % usage: 6 % hdb3 (d) 7 % author: 8 % Anastasios Latsas 9 10 % pulse height 11 pulse = 5; 12 13 % assume that current pulse level is a "low" pulse; this is 14 % the pulse level for the bit before given bitstream The binary dump or binary file generated by the previous calculator can be passed to the following calculator, which will restore the original string. (zarlink product – MV 1449,MV 1442, MV 1471 ) Description HDB3, HDB3 Datasheet search, HDB3 The binary dump or binary file generated by the previous calculator can be passed to the following calculator, which will restore the original string. For example: BCCXOR. Encoding and streaming to Streambox Cloud Services, Streambox Enterprise Server, or direct point to point connectivity to Streambox media players. Yesterday I got a call asking about HDB3 encoding. View Notes - hdb3_coding from EE 136 at New York University. Multiple hashing algorithms are supported including MD5, SHA1, SHA2, CRC32 and many other algorithms. news69. RZ. The encoding rules follow those for AMI, except that a sequence of four consecutive 0’s are encoding using a special “violation” bit. MOORE, B. (for Windows If the encoder uses X2 or X4 encoding, the encoder’s required PPR should be divided by a factor of 2 or 4, respectively. HDB3 (High Density Bipolar of order 3 code) is a telecommunications line code mainly used in Japan, Europe and Australia (for example, in E-1 lines) and is based on AMI. 4. Uncategories mathlab code HDB3. Add new ancient: Nogardnit. Hdb3 Encoding Example Ppt. HDB3 Encoding. AMI stands for Alternate Mark Inversion. Cancel. How length influences your messaging cost*: 0 – 160 characters – 1 segment and charged as a single message. It's because the Unsafe ASCII characters in the URL is encoded to % followed by hexadecimal code. 00 2000 50. Video pts will increase same amount of 'Video frame duration' per frame. - SMS Header. my codes matlab c,c++ vhdl HDB3 (Europe, Japan – High Density Bipolar – 3 Zeros): Any string of 4 zeros is replaced by a string with one code violation (violation of the rule of alternating positive and negative levels). The browser can recognize the URL in standard ASCII format; especially the URI reserved character set should be used for their intended purpose only. Size: Video, audio, other and remaining. Message Parsed Segments. Binary adder or addition calculator - online tool, logic & solved example to perform addition between to binary numbers. This “core” is actually two cores – an HDB3/HDB2/B3ZS Encoder that converts NRZ data into P and N pulses according to ITU-T G. Compared to the original or a higher bitrate encoding however, it will look obviously washed-out if bitrate is too low. 5,499. Manchester Encoding Networks: Data Encoding 12 • There is always a mid-bit transition {which is used as a clocking mechanism}. (choose the same encoding or specify the same dictionary explicitly). BiPolar AMI. All BASE64 characters can be displayed on the standard ASCII terminal. So since the red 1 is -, the blue 1 should be +. 97 2002 30. We'll take a closer look at HDB3 to give you a better idea of how run-length limited encoding schemes work in general. Unicode Encoding: Compared to the GSM charset, Unicode encoding supports a huge range of languages and symbols. Address machine instruction asm instruction. This type of encoding takes up a lot of space, thus reducing the number of characters allowed in a message to 70. File Size Calculator. 3 baseband coaxial cable and CSMA/CD twisted pair. "Hours of Motion" only alters storage (in this calculator) On some NVRs, StarDot's "Video on Motion" mode also reduces bandwidth. g. The signal level is normally low. Encoding Methods There are a number of different encoding methods used on T1 lines. Description. SHA-1 was used in security applications, protocols and in distributed revision control systems. 0e9 can be found here. Can anyone give me clear rule of HDB3? I read some materials with little bit different rules that make me confused. However, you can directly calculate the columns of the origin table. It also calculates the length of the string both in symbols and in bytes. 1,288. Binary Addition Calculator. This algorithm generates a 160-bit hash based on the same principles as MD4 and MD5 hash functions. 703. Any arithmetic operation in digital circuits happen in the binary form, therefore, the Binary addition is one of a Configuring E1 Line Encoding By default, E1 interfaces use HDB3 line encoding. So, it's important to use this calculator to make sure that you don't Hash Calculator Online. • this is an example of differential encoding. Input and output in binary, decimal, hexadecimal or ASCII. . * SUM MARY An investigation has been carried out to assess the implications for broadcast signal distribution of the use of HDB3 as the proposed customer interface code in the Post Office digital communication network. However, if your text message contains a symbol that isn’t in the 7-bit alphabet, UCS-2 encoding must be used. that’s a lot of disk space even today. $. Using only mirroring would give 0 GB available capacity. BASE64 encoding can be used to transmit binary data (in practice it means any kind of data) via text protocols e. AMI encoding causes the line to alternate between positive and negative pulses for successive 1’s. Buy Calculated Industries 4095 Pipe Trades Pro Advanced Pipe Layout and Design Math Calculator Tool for Pipefitters, Steamfitters, Sprinklerfitters and Welders | Built-in Pipe Data for 7 Materials , White: Basic - Amazon. Optimized profiles. After the simulation experiment, it will be implemented in HDB3 LINE CODING PDF. Bandwidth Calculator. Is this correct? The AMI code replaces each logical 1 by a polarity inversion noted with + (plus) and - (minus). Using any other encoding will result in a file that will not load into the code block. Data to convert. When the message length sent through an SMS API, for example, exceeds the SMS character limit of 160 characters in case of 7bit encoding (or 70 characters for UCS-2 encoding), the message is split up into multiple separate SMS and sent to the handset separately as well. 5 (token ring LAN) 0V Calculate the exclusive or (XOR) with a simple web-based calculator. 0e10 calculators. Return-to-Zero. Set the framing value to hdb3. Read more here about dpi and bit depth. MediaCalculator 3 provides calculators It is used to decode the Escaped-encoding URL. This encoding helps to ensure that the data remains intact without modification during transport. For example, if the application calls for an encoder that has a resolution of 2500 PPR, but X4 encoding is being used, then the encoder’s actual resolution only needs to be 625 PPR (2500 ÷ 4). Finance. For example, the E-SBC is a terminal endpoint connecting to a Telco through NT1 HDB3. OXIDATION NUMBERS CALCULATOR. I have already found chips have this functionality. This bit has the same polarity as the last 1-bit which was sent using the AMI encoding rule. HDB3 code encoding MATLAB: Draw the user-specified 01 sequence diagram and calculate its corresponding AMI code, bi-phase code and CMI code Communication Theory --- FPGA --- HDB3 decoder Binary calculator,Hex calculator: add,sub,mult,div,xor,or,and,not,shift. Fully managed encoding service, including optimized AVC profiles for your VoD workflow and Bitmovin’s patented Per-Title technology. Email: donsevcik@gmail. Alternate Mark Inversion (AMI), Bipolar With 8-Bit Substitution (B8ZS), and High Density Bipolar Three Code (HDB3) will be discussed here. Test: The test shall be conducted according to Annex A, subclause A. A) Coaxial B) Fiber-optic C) Twisted-pair D)none of the above HDB3 substitutes four consecutive Figure 4. Puma 4000 Series Application Note Puma Application Note PMA51A1 HDB3 Code Encoding HDB3 is a modified version of the AMI code which Design and implementation of HDB3 encoding and decoding – AngelList This avoided the need to modify the AMI code in any way, but limited available data rates to 56, bits per second per DS0 voice channel. Messaging Segment Calculator. HDB3 ENCODING PDF. I’m doing project regarding HDB3 line cording, (High Density Bipolar 3) and I need to find a chip which function as HDB3 encoding and decoding. So ydb3, what would the encoded string be if there is a 0 before the blue 1 and the black 0? The signal level changes in the middle of a bit time if the bit is 0. The HDB3 (High-Density Bipolar Order 3) code relies on the transmission of both positive and negative pulses and is the encoding technique used over G. 26 Quantization and encoding of a sampled signal . (zarlink product – MV 1449,MV 1442, MV 1471 ) Description HDB3, HDB3 Datasheet search, HDB3 Binary Line Coding Techniques • Return-to-zero (RZ). The page will refresh to show your estimate with CSP pricing. If you are encoding video for a different format (ex. Trophy points. That's typically helpful, but in this case is not. 1. Black Box Network Services is the world’s largest independent provider of communications, infrastructure, and product solutions. 703 E1 networks. mathlab code HDB3 news69 9:41 PM. Full HD resolution is typically 1080p, 60 frames per second (fps). The IDT82V2042E performs clock/data recovery, AMI/ B8ZS/HDB3 line decoding and detects and reports the LOS conditions. 2) Given the narrow (usable) audio bandwidth of a telephone transmission facility, a nominal SNR db of 56dB (400,000), and a distortion level of <0. Updates in June 2017: For more details on updates to EMVLab, including HTTPS and better handling of 3-byte and unknown tags see my blog post. This MATLAB script simulates HDB3 line encoder. Enable terminating resistance when the E-SBC operates as the CPE side. Storage Efficiency: 0% ? Mirroring has 33% efficiency. It is necessary to set the method of forming the source dictionary in the same way as it is set for the compression calculator. In 2005 security weakness were deteced in this algorithm. term-resistance: Enable or disable terminating resistance. 0e9 and 1. 2%, a. Try e. 56 We can calculate the number of bits as Previous Tool: Sorry no more. So the next thing you're doing by base64 encoding is that you're base64 encoding the hex representation of the hash rather than the raw bytes. 777) or symbolic notation (e. So the stronger To view an estimate with CSP pricing and offers, sign in to the Azure pricing calculator using the same credentials you use to sign in to Partner Center. Bipolar-RZ. Scroll down to the bottom of the page. Url Encoding Free Downloads - convmv - Base64 Encoding MediaCalculator 3. Consequently, there may be a second transition at the beginning of the bit interval. 00 1000 59. Default: Disabled. It also popularly known as binary adder in digital electronics & communications. This bias calculator comes with the actual formula and a very easy to use and helpful continuous bias binding chart to figure out your bias needs in a blink of an eye! The formula in my bias binding calculator will help you figure out how much fabric you will get from yardage from fabric square and how much bias you get from the fabric you own. Adler-32 is realized by solving two 16-bit values A and B, and concatenating the results into a 32-bit integer; A is the %HBD3 clc; clear all; close all; x=[1 1 0 0 0 0 0 0 0 0 1 1 0 0 0 0 0 1 0]; %x=[1 0 0 0 0 1 0 1 1 1 0 0 0 0 1 0 1]; %x=[0 0 0 0 0 1 1 1 0 0 0 0 1 0]; The online SHA256 hash calculator you found outputs the hash as a hex-encoded string rather than the raw bytes. to encode the Swedish characters åäö with utf-8 and then decode them with iso-8859-1, or try to encode Run Length Encoding Calculator-- Enter Text . Run Length Encoding Video. for example the forward slash (⁄) is an URI reserved character to delimit the components in the URL. Hexadecimal: 42 43 43 58 4F 52. 1 - Calculate video data rate before encoding. . to encode the Swedish characters åäö with utf-8 and then decode them with iso-8859-1, or try to encode This compression ratio calculator can be used to work out the compression ratio of your engine. Interested friends can go and have a look. Max FPS: 10MP=6, 5MP=10, 3MP=12, 1080P=25, 1. A) RZ B) Manchester C) Differential Manchester D) All the above 2- which cables are composed of a glass or plastic inner core surrounded by cladding, all encased in an outside jacket. This is an encoding / decoding tool that lets you simulate character encoding problems and errors. 55 We can calculate the number of bits as Total Bandwidth: Average Bandwidth per Camera: Estimated Storage: Notes: 30/25 FPS applies to D1, 720P, 1080P and 1. This area of the calculator tells you the approximate size of the files that will be created if you use the suggested Calculate the Run Length Encoding for AAAABBBBBBBBBCADDDDEEFFFFFFFF Find consecutive letters/numbers: AAAA BBBBBBBBBCADDDDEEFFFFFFFF We have another consecutive pattern in red with 4 As in AAAA We write this piece as 4A AAAA BBBBBBBBB CADDDDEEFFFFFFFF We have another consecutive pattern in red with 9 Bs in BBBBBBBBB We write this piece as 9B The approximate size of each uncompressed frame is 5MB. The calculator below converts an input string to UTF-8 encoding. Sc. From text. High Density Bipolar 3 (HDB3) It works in a similar way to HDB3 but uses 4 zeroes rather than 8. ), ignore this suggestion and calculate the GOP size and structure manually (or use your encoder's defaults). Using only parity would give 0 GB available capacity. Combining these in the proportions you've chosen gives 0% overall. 307 – 459 characters – 3 segments and charged as three Density Bipolar code of order 3 (HDB3) encoding rules (see Annex B). 264 and similar modern codecs are very capable at gracefully degrading the image, therefore even if you go far below what this calculator suggests, it may still look OK on its own. Hash Calculator. per year. The purpose of use was to identify revisions and to detect data corruption. If you want to provide a 1080p video, we store it in 1080p, 720p, 480p, 360p, 240p; It's up to you which levels you want to offer your customers. #################################################################### #属性: #1、启动使能端开始认为数据输入 #2、编码块中,在输出的是数据时,输出指示端为高电平,其他时间为低电平 #3、编码块中,输入输出延时大约为5到6个时钟周期 #4、编码块 HDB3 ENCODING PDF. Since I am not memorizing everything B8ZS and HDB3 Encoding • HDB3: High Density Bipolar 3 Zeros – String of four zeros replaced according to the following: + 000+-00-– 000- +00+ Polarity of preceding pulse odd even Number of Pulses (ones) since Last Substitution gbabic Presentation C 18 Digital Data Analog signal ASK - Amplitude shift keying FSK - Frequency shift keying Bandwidth Calculator. Modified AMI codes are a digital telecommunications technique to maintain system In order to preserve AMI coding’s desirable absence of DC bias, the number of the high density bipolar of order 3 (HDB3) code replaces any instance of 4. This reduces the actual bandwidth with a factor 2. Encoding —Midbittransition occurs always and is used for clocking only —Transition at start of a bit period represents binary 0 —No transition at start of a bit period represents binary 1 —Note: this is a differential encoding scheme —Used by IEEE 802. Reaction score. Use this cheat sheet to calculate the duration: FPS Frame duration 23. URL Encoding is also called as Percent-Encoding. Chmod Calculator. If you have the bandwidth and encoding power to stream at 1080p, 60 fps, great! If not, try one of the recommended settings below to optimize your video This is an encoding / decoding tool that lets you simulate character encoding problems and errors. The precoded duobinary encoding model implemented in the LINE-CODE 1 function hdb3( bitstream ) 2 %HDB3 High Density Bipolar 3-zeros 3 % sample data: 4 % d = [ 1 1 0 0 0 0 0 0 0 0 1 1 0 0 0 0 0 1 0 ] 5 % usage: 6 % hdb3 (d) 7 % author: 8 % Anastasios Latsas 9 10 % pulse height 11 pulse = 5; 12 13 % assume that current pulse level is a "low" pulse; this is 14 % the pulse level for the bit before given bitstream The AMI code replaces each logical 1 by a polarity inversion noted with + (plus) and - (minus). Output. HDB3 substitutes four consecutive Figure 4. Line Encoding is an integral part of Digital Data Communication. HDB3 Line Encoder Simulation – File Exchange – MATLAB Central. Decoded Data tab is removed from the calculator. Next Tool: Online CheckSum Calculator Release date:2020-06-20 22:08:37 Tool source:ME2 Online Tools High Density Bipolar of order 3 (HDB3) – bckurera’s thoughts. Chmod Calculator is a free utility to calculate the numeric (octal) or symbolic value for a set of file or folder permissions in Linux servers. Encoding and decoding of HDB3 ① (realized by MATLAB) September 11, 2021. com Tel: 800-234-2933; Adler32 checksum calculator. Activity points. Switch to bootstrap-based themes. Used in 802. com FREE DELIVERY possible on eligible purchases 1- Which of the following encoding has a transition at the middle of each bit. Bipolar Return-to-Zero. Base64 encoding schemes are commonly used when there is a need to encode binary data, especially when that data needs to be stored and transferred over media that are designed to deal with text. With this technique, both timing and data can be transmitted over just two wires in each direction HDB3 is a development of AMI (Alternate Mark Inversion), a line In the last introduction to the coding and decoding of hdb3, the coding rules of hdb3 are briefly introduced, and the simulation experiments are carried out with MATLAB.