Lecture 16

Lecture 16 - EE 555 Broadband Network Architectures Spring...

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EE 555 Broadband Network Architectures Spring 2009, Prof. John Silvester Access Network Technologies Wired Options in the Local Loop • Dia -up Dial up •ISDN • DSL DSL • Cable Fiber FTTx • Fiber (FTTx) • Wireless LAN’s Wide Area Wireless • Wide Area Wireless – Cellular – WIMAX usc-den-ee555-spring 2009 - Access Network Technologies 2
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Dia -up Dial up • Restricted to 56Kbps due to bandwidth Restricted to 56Kbps due to bandwidth limitations in the analog voice-oriented last mile which is bandwidth limited to 4KHz mile which is bandwidth limited to 4KHz. usc-den-ee555-spring 2009 - Access Network Technologies 3 ISDN • ISDN provided for a digital voice solution ISDN provided for a digital voice solution to the Customer premises Used baseband digital signalling • Used baseband digital signalling • Basic Rate Interface (BRI) delivered 2B+D – B channel is 64Kbps (for voice or data) – channel is 16Kbps for data or signalling • Deployment was slow and the technology was overtaken by others such as DSL usc-den-ee555-spring 2009 - Access Network Technologies 4
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DSL • Various digital subscriber line standards Various digital subscriber line standards and technologies have been developed. They use the copper local loop and They use the copper local loop and achieve higher data rates by removing the bandwidth filters at the C O and the bandwidth filters at the C.O. and the utilization of multiple carriers. usc-den-ee555-spring 2009 - Access Network Technologies 5 Asymmetrical Digital Subscriber Line (ADSL) • link between subscriber and network link between subscriber and network • uses currently installed twisted pair cable • is Asymmetric bigger downstream than up is Asymmetric - bigger downstream than up • uses Frequency division multiplexing – reserve lowest 25kHz for voice (POTS reserve lowest 25kHz for voice (POTS) – uses echo cancellation or FDM to give two bands • has a range of up to 5.5km has a range of up to 5.5km usc-den-ee555-spring 2009 - Access Network Technologies 6
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ADSL Channel Configuration POTS- Plain old telephone service No echo cancellation. Separate up and downstream using FDM With echo cancellation, up and downstream can use same frequency band usc-den-ee555-spring 2009 - Access Network Technologies 7 Discrete Multitone (DMT Discrete Multitone (DMT) • multiple carrier signals at different frequencie multiple carrier signals at different frequencies • divide into 4kHz subchannels • test and use subchannels with better SNR test and use subchannels with better SNR • 256 downstream subchannels at 4kHz (60kbps) – in theory 15 36Mbps in practice 1 5-9Mbps in theory 15.36Mbps, in practice 1.5 9Mbps usc-den-ee555-spring 2009 - Access Network Technologies 8
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DSL Technology Options Family ITU Name Ratified Maximum Speed capabilitie Speed capabilities ADSL G.992.1 G.dmt 1999 7 Mbps down, 800 kbps up ADSL2 G.992.3 G.dmt.bis 2002 8 Mb/s down, 1 Mbps up ADSL2plus G.992.5 ADSL2plus 2003 24 Mbps down, 1 Mbps up ADSL2-RE G.992.3 Reach Extended 2003 8 Mbps down 1 Mbps up SHDSL G.991.2 G.SHDSL 2001 5.6 Mbps up/down VDSL G.993.1 Very-high-data-rate 2004
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Lecture 16 - EE 555 Broadband Network Architectures Spring...

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