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Access Networks

Access Networks. PSTN DSL ATM. PSTN. P ublic S witched T elephone N etwork PSTN technical standards created by the ITU-T (formerly CCITT), and uses E.163/E.164 addresses (known more commonly as telephone numbers) for addressing. NAS. Modem emulator. Router. Core. PSTN Connection.

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Access Networks

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  1. Access Networks PSTN DSL ATM

  2. PSTN • Public Switched Telephone Network • PSTN technical standards created by the ITU-T (formerly CCITT), and uses E.163/E.164 addresses (known more commonly as telephone numbers) for addressing.

  3. NAS Modem emulator Router Core PSTN Connection PSTN switch MDF ISP

  4. DSL • Often called xDSL due to many variants • ADSL, SHDSL, HDSL, IDSL • ADSL: Asymmetric Digital Subscriber Line • SDSL: Symmetric Digital Subscriber Line

  5. ADSL • Line splitter / Filter • Data in higher frequency • Voice in lower frequency

  6. splitter / filter filter LAN Core DSL connection DSLAM BRAS MDF ISP RADIUS Voice to PSTN

  7. DSL Modem

  8. PPP • Point-to-Point Protocol; RFC 1661 • Commonly encapsulated as PPPoE or PPPoA • Auto configured via LCP

  9. ATM • Asyncronous Transfer Mode • Operates at L2 • UNI connections – customer interface • NNI connection – internodals

  10. VP/VC • Virtual Path • Virtual Channel • Locally significant only

  11. Auckland aEDGE01 Tauranga aEDGE01 at-1/2/3.0.32 at-1/0/1.0.23 at-0/0/0.130.62 at-0/0/0.98.30 Tauranga aCORE01 Auckland aCORE01 at-1/1/1.98.30 at-1/1/1.130.62 at-2/2/2.90.78 at-1/2/1.90.78 PVC: Private Virtual Circuit

  12. Tauranga aEDGE01 Auckland aEDGE01 at-1/0/1.84 at-1/2/3.32 at-0/0/0.67 at-0/0/0.109 Tauranga aCORE01 Auckland aCORE01 at-1/1/1.67 at-1/1/1.109 at-2/2/2.78 at-1/2/1.78 PVP: Private Virtual Path

  13. VPI 1 VPI 0 VCI 108 VCI 108 VCI 45 VCI 45 VCI 56 VCI 56 Core

  14. aCORE01 aCORE01 aCORE02 aEDGE01 aEDGE32 aCORE11 aCORE12 Transport Network SPVC Scenario 1: Node Failure

  15. aCORE01 aCORE02 aEDGE01 aEDGE32 aCORE11 aCORE12 Transport Network SPVC Scenario 2: Port Failure

  16. MIR/PIR • Minimum Information Rate • Reserved bandwidth • Peak Information Rate

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