Infocom Systems Infokommunikációs rendszerek 10. előadás ADSL

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Presentation transcript:

Infocom Systems Infokommunikációs rendszerek 10. előadás ADSL Takács György Infocom10. 2016. 11. 21.

2004 Infocom10. 2016. 11. 21.

2006. november maximális letöltési sebesség (kbit/s) maximális feltöltési sebesség (kbit/s) Havidíj hűségnyilatkozattal (Ft) ADSL Optimum 512 96 4900 ADSL Prémium 1024 128 7900 ADSL Maximum 2048 192 9900 Infocom10. 2016. 11. 21.

maximális letöltési sebesség (kbit/s) 2008. november maximális letöltési sebesség (kbit/s) maximális feltöltési sebesség (kbit/s) Havidíj hűségnyilatkozattal (Ft) DSL CLASSICHappy 2 Mbit/sec 192 kbit/sec 3 990 Ft DSL CLASSIC MEDIUM 8 Mbit/sec 480 kbit/sec 6 890 Ft DSL CLASSIC EXTRA 25 Mbit/sec 4 Mbit/sec 9 890 Ft Infocom10. 2016. 11. 21.

2012. November NetMániaS 10 (1) 0,5 (0,2) 3990 NetMániaM 20 (10) maximális (garantált) letöltési sebesség (Mbit/s) Maximális (garantált) feltöltési sebesség (Mbit/s) Havidíj 2 év hűségnyilatkozattal (Ft) NetMániaS 10 (1) 0,5 (0,2) 3990 NetMániaM 20 (10) 1 (0,5) 4690 NetMániaL 30 (20) 1 (1) 5490 Infocom10. 2016. 11. 21.

2015. November Infocom10. 2016. 11. 21.

2016 november Infocom10. 2016. 11. 21.

What is ADSL(VDSL, XDSL,G.fast) ? Asymmetric Digital Subscriber line, A modem technology, Convert existing twisted-pair telephone lines into access paths for multimedia and high speed data communication, Can transmit to 30 Mbps downstream (VDSL 100 Mbps G.fast up to 1 Gbps!) , Can transmit up to 30 Mbps upstream, Transform the existing PSTN network to a powerful system capable of bringing multimedia, full motion video to the subscriber’s home. Infocom10. 2016. 11. 21.

ADSL system components PSTN Network low pass filter low pass filter user twisted pair cable IP Network bandpass filter bandpass filter Infocom10. 2016. 11. 21.

ADSL system components Infocom10. 2016. 11. 21.

ADSL in the complete system (Application Service Provider, Internet Service Provider, ACCESS Network Provider, Customer/User Infocom10. 2016. 11. 21.

ADSL components at the subscriber Infocom10. 2016. 11. 21.

ADSL components at Central Office Infocom10. 2016. 11. 21.

Maximum speed capabilities DSL Technology Options Family ITU Name Ratified Maximum speed capabilities ADSL G992.1 G.dmt 1999 7 Mbps down 800 kbps up ADSL2 G992.3 G.dmt.bis 2002 8 Mbps down 1 Mbps up ADSL2plus G992.5 2003 24 Mbps down 1 Mbps up ADSL2-RE Reach Extended SHDSL G991.2 G.SHDSL 5.6 Mbps up/down VDSL G993.1 Very-high-data-rate-DSL 2004 55 Mbps down 15 Mbps up VDSL2-12MHz long reach G993.2 Very-high-data-rate-DSL 2 2005 55 Mbps down 30 Mbps up VDSL2-30MHz short reach 100 Mbps up/down G.fast G9700 G9701 2014 1000 Mbps (Aggregated) <100m Infocom10. 2016. 11. 21.

Twisted pair to the building, Fibre to the Cabinet (FTTCab), Fibre to the Building (FTTB) Infocom10. 2016. 11. 21.

What is the future of the ADSL? Will play a crucial role over the next ten years for telephone companies and other service providers New broadband cabling will take decades to reach all prospective subscribers. EU regulation document on local loop unbundling because no competitive technology! Infocom10. 2016. 11. 21.

dividing the spectrum to 256 subfrequencies Infocom10. 2016. 11. 21.

adaptive SNR discovery Infocom10. 2016. 11. 21.

The technology being used is DMT which divides the frequency range to 256 sub-frequencies from 64Khz to 1.1Mhz Each sub-ferqency is an independent channel and has it own stream of signals . The ADSL protocol defines a basic stream of data which is known to both endpoints in advanced and enables them to find the specific SNR for each sub-frequency , and uses this information to split the data over the sub-frequencies Infocom10. 2016. 11. 21.

Infocom10. 2016. 11. 21.

VDSL frequency plan and profiles Infocom10. 2016. 11. 21.

Infocom10. 2016. 11. 21.

Infocom10. 2016. 11. 21.

Limiting factors: Cable attenuation Reflexion Crosstalk (NEXT, FEXT) Noises, interferences Infocom10. 2016. 11. 21.

key requirements (1) Test loops – makeup and topology (to ensure adequate penetration). Cross talk or steady state noise margin (to allow for interactions from other DSL in a multi-pair cable). Data rates (both line and payload). Impulsive or transient noise margin (to allow for noise spikes e.g. ringing). Transmitter power spectral density limits (to ensure spectral compatibility and minimise unwanted RF emissions). Return loss (to ensure good line matching and signal power transfer). Line interface balance (to prevent EMC problems). Infocom10. 2016. 11. 21.

key requirements (2) Framing and data scrambling (to prevent cyclo-stationary effects e.g. line spectra). Latency (to minimise delay e.g. for voice traffic). Jitter and wander (to minimise data loss). Start up protocols (handshaking). Warm/cold start limits (time taken to synchronise and achieve reliable bit transport – to minimise circuit unavailability). Line coding (to achieve efficiency in terms of bits/s/Hz) Duplexing (e.g. time, frequency, echo cancellation). Infocom10. 2016. 11. 21.

key requirements (3) Forward error correction (to self-correct physical layer transmission errors and not burden higher layer protocols with data re-transmission.) Embedded operations and maintenance (for the transfer of service related information e.g. QoS). Infocom10. 2016. 11. 21.

Code & Error Correction One of the most important technology breakthrough that helped the ADSL is the coding . Using a method called consellation encoding and based on Reed Solomon coding decoding the information on the line can be damaged and yet the decoder rebuild the information in a very high reliability.To improve the performance of ADSL system some companies use 16 state 4 dimensional trellis code on top of the consellation encoding. Another useful method to increase the ADSL systems reliability is Forward Error Correction (FEC). Infocom10. 2016. 11. 21.

Framing & Scrambling As most of the Computer communication networks the ADSL uses a specific framing method . The main frame is called Superframe and it is composed of 68 ADSL data frames , the ATU-C sends a superframe every 17 msec . Each data frame gets his information from two data buffers (interleaved buffer and fast buffer)which are scrambled at a specific sequence , this scrambling method makes the error correction and coding more efficient. Infocom10. 2016. 11. 21.

Infocom10. 2016. 11. 21.

DSLAM-s near to the PPKE-ITK Campus offered by the Hungarian Telecom (Reference Unbundling Offer) Infocom10. 2016. 11. 21.

Beyond VDSL2 – G.fast Infocom10. 2016. 11. 21.

Fibre to a distribution point -- FTTdp Service rate performance targets: 500-1000 Mbit/s for FTTB deployments @<100m 500 Mbit/s at 100m 200 Mbit/s at 200m 150 Mbit/s at 250m Infocom10. 2016. 11. 21.

Infocom10. 2016. 11. 21.

Coexistence and migration from VDSL2 to G.fast Infocom10. 2016. 11. 21.

Optional control of downstream/upstream Duplexing method: TDD (time division duplex) easily vary DS/US asymmetry ratio Optional control of downstream/upstream asymmetry ratio from 90/10 to 10/90 Infocom10. 2016. 11. 21.

Modulation: discrete multi-tone (DMT) 2048 sub-carriers for 106 MHz, 4096 sub-carriers for 212 MHz Sub-carrier spacing 51.75 kHz Bit loading of ≤12 bits/sub-carrier Infocom10. 2016. 11. 21.

Standardization Infocom10. 2016. 11. 21.

What can we learn from XDSL story? No ultimate technology!! Frequency division multiplexing, time division multiplexing, modulation, error control, flow control, scrambling, signal processing, adaptation, STM-ATM, trellis coding, in-service performance monitoring and surveillance, initialization, handshaking, channel analysis, are mixed in XDSL More room for further development…. Infocom10. 2016. 11. 21.