DSL CPE Module A unique solution for enabling board functional test - - PowerPoint PPT Presentation

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DSL CPE Module A unique solution for enabling board functional test - - PowerPoint PPT Presentation

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EBTW05 EBTW05 DSL CPE Module A unique solution for enabling board functional test of existing & emerging DSL technologies. EBTW 2005, Tallinn, Estonia Slide 1 EBTW05 EBTW05 Introduction What is DSL? What is a DSLAM and where

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SLIDE 1

Slide 1 EBTW 2005, Tallinn, Estonia

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DSL CPE Module

A unique solution for enabling board functional test of existing & emerging DSL technologies.

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SLIDE 2

Slide 2 EBTW 2005, Tallinn, Estonia

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Introduction

  • What is DSL?
  • What is a DSLAM and where does it fit in the network?
  • Original DSLAM test model.
  • Problems & The Solution - CPEM.
  • CPEM – Key features.
  • CPEM – Key benefits.
  • Revised DSLAM test model.
  • CPEM – Adoption.
  • Summary.
  • Q & A.
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SLIDE 3

Slide 3 EBTW 2005, Tallinn, Estonia

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What is DSL?

  • Broadband = Digital Subscriber Line.
  • xDSL = Catchall for all DSL flavours (ADSL, HDSL, RADSL, etc.).
  • CPE = Customer Premises Equipment.
  • COE = Central Office Equipment.
  • Uses normal copper telephone lines for path.
  • Makes use of frequencies above normal voice range (> ~3.4KHz).
  • Provides data rates of upto 50Mbps (>800 x faster than 56k modems).
  • Broadband = Digital Subscriber Line.
  • xDSL = Catchall for all DSL flavours (ADSL, HDSL, RADSL, etc.).
  • CPE = Customer Premises Equipment.
  • COE = Central Office Equipment.
  • Uses normal copper telephone lines for path.
  • Makes use of frequencies above normal voice range (> ~3.4KHz).
  • Provides data rates of upto 50Mbps (>800 x faster than 56k modems).
  • Very sensitive to signal degradation:
  • Cable length (maximum distance from CPE to DSLAM for ADSL = 18 Kft/5.5

Km).

  • Cable quality.
  • Number of cable breaks and joins.
  • Very sensitive to signal degradation:

Very sensitive to signal degradation:

  • Cable length (maximum

Cable length (maximum distance

distance from CPE to DSLAM for ADSL = 18 Kft/5.5

from CPE to DSLAM for ADSL = 18 Kft/5.5 Km). Km).

  • Cable quality.

Cable quality.

  • Number of cable breaks and joins.

Number of cable breaks and joins.

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SLIDE 4

Slide 4 EBTW 2005, Tallinn, Estonia

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What is a DSLAM & where does it fit in the network?

  • DSLAM = DSL Access Multiplexer.
  • Aggregates connections from many customers onto a single,

high-capacity connection onto the IP or ATM network.

  • Flexible and able to support multiple types of DSL in a single

central office.

  • DSLAM =

DSLAM = DSL DSL A Access ccess M M ultiplexer. ultiplexer.

  • Aggregates

Aggregates connections from many customers onto a single, connections from many customers onto a single, high high-

  • capacity connection

capacity connection on

  • nto

to the IP or ATM network the IP or ATM network. .

  • Flexible

Flexible and able to support multiple types of DSL in a single and able to support multiple types of DSL in a single central office central office. .

USER

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SLIDE 5

Slide 5 EBTW 2005, Tallinn, Estonia

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Original DSLAM Test Model

Upstream data path test (CPECOE):

  • Ingress via a bank of CPE devices

connected to DSLAM DSL modems.

  • Aggregated and routed through DSLAM.
  • Egress onto the ATM backbone.

Upstream data path test (CPECOE):

  • Ingress via a bank of CPE devices

connected to DSLAM DSL modems.

  • Aggregated and routed through DSLAM.
  • Egress onto the ATM backbone.

STINGER FS+ DUT DSLAM DATA DESTINATION CPE DEVICES TRAFFIC SINK DATA SOURCE CPE DEVICES TRAFFIC SOURCE DATA DATA

Downstream data path test (COECPE):

  • ATM ingress via a copper or fibre trunk.
  • Routed through DSLAM.
  • Egress via bank of CPE devices connected

to DSLAM DSL modems. Downstream data path test (COECPE):

  • ATM ingress via a copper or fibre trunk.
  • Routed through DSLAM.
  • Egress via bank of CPE devices connected

to DSLAM DSL modems.

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SLIDE 6

Slide 6 EBTW 2005, Tallinn, Estonia

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DSLAM Test Model – Measurements

  • Upstream/Downstream throughput rates.
  • Synchronization speed.
  • Line Attenuation.
  • SNR (Signal to Noise Ratio).
  • Noise Margin.
  • Upstream/Downstream power.
  • Bit Error Rate (BERT) performance.
  • Upstream/Downstream throughput rates

Upstream/Downstream throughput rates. .

  • Synchronization

Synchronization speed speed. .

  • Line Attenuation

Line Attenuation. .

  • SNR (Signal to Noise Ratio)

SNR (Signal to Noise Ratio). .

  • Noise Margin

Noise Margin. .

  • Upstream/Downstream power

Upstream/Downstream power. .

  • Bit Error

Bit Error R Rate ate (BERT) (BERT) performance performance. .

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SLIDE 7

Slide 7 EBTW 2005, Tallinn, Estonia

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The Problem & The Solution - CPEM

The Problems:

  • Multiple xDSL variants – too many variants.
  • DSLAM Density – too many ports.
  • Modular Solution – nothing ‘off the shelf’.
  • ADSL2+ CPE Readiness – nothing available.

The Problems: The Problems:

  • Multiple xDSL variants

Multiple xDSL variants – – too many variants. too many variants.

  • DSLAM Density

DSLAM Density – – too many ports. too many ports.

  • Modular Solution

Modular Solution – – nothing nothing ‘ ‘off the shelf

  • ff the shelf’

’. .

  • ADSL2+ CPE Readiness

ADSL2+ CPE Readiness – – nothing available. nothing available.

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SLIDE 8

Slide 8 EBTW 2005, Tallinn, Estonia

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The Problem & The Solution - CPEM

The Problems:

  • Multiple xDSL variants – too many variants.
  • DSLAM Density – too many ports.
  • Modular Solution – nothing ‘off the shelf’.
  • ADSL2+ CPE Readiness – nothing available.

The Problems: The Problems:

  • Multiple xDSL variants

Multiple xDSL variants – – too many variants. too many variants.

  • DSLAM Density

DSLAM Density – – too many ports. too many ports.

  • Modular Solution

Modular Solution – – nothing nothing ‘ ‘off the shelf

  • ff the shelf’

’. .

  • ADSL2+ CPE Readiness

ADSL2+ CPE Readiness – – nothing available. nothing available.

The Answer:

  • Multiple Port CPE Module that fits in with DSLAM

architecture. The Answer: The Answer:

  • Multiple Port CPE Module that fits in with DSLAM

Multiple Port CPE Module that fits in with DSLAM architecture. architecture.

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SLIDE 9

Slide 9 EBTW 2005, Tallinn, Estonia

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CPEM – Key Features

Key Features:

  • Based on Conexant Argon 330 reference design. Provides:
  • xDSL WAN interface, and
  • IP LAN interface.
  • 28 single channel (identical) CPE devices on 1 card.
  • 24 usable at any time (4 spares).
  • Individually upgradeable firmware.

Key Features Key Features: :

  • Based on Conexant Argon 330 reference design. Provides:

Based on Conexant Argon 330 reference design. Provides:

  • xDSL WAN interface, and

xDSL WAN interface, and

  • IP LAN interface.

IP LAN interface.

  • 28 single channel (identical) CPE devices on 1 card.

28 single channel (identical) CPE devices on 1 card.

  • 24 usable at any time (4 spares).

24 usable at any time (4 spares).

  • Individually upgradeable firmware.

Individually upgradeable firmware.

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SLIDE 10

Slide 10 EBTW 2005, Tallinn, Estonia

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CPEM – Key Benefits

Key benefits:

  • Out the box ADSL2+ support.
  • Uses DSLAM form factor.
  • Firmware upgradeable for:
  • Support of multiple DSL flavours, and
  • Future compliance to emerging DSL standards.
  • Multiple configuration modes supported:
  • HTTP (Web Browser)
  • CLI/CIT.
  • Over LAN, and
  • Over serial connection.
  • Eliminates dependence on OEM CPE devices.

Key benefits: Key benefits:

  • Out the box ADSL2+ support.

Out the box ADSL2+ support.

  • Uses DSLAM form factor.

Uses DSLAM form factor.

  • Firmware upgradeable for:

Firmware upgradeable for:

  • Support of multiple DSL flavours, and

Support of multiple DSL flavours, and

  • Future compliance to emerging DSL standards.

Future compliance to emerging DSL standards.

  • Multiple configuration modes supported:

Multiple configuration modes supported:

  • HTTP (Web Browser)

HTTP (Web Browser)

  • CLI/CIT.

CLI/CIT.

  • Over LAN, and

Over LAN, and

  • Over serial connection.

Over serial connection.

  • Eliminates dependence on OEM CPE devices.

Eliminates dependence on OEM CPE devices.

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SLIDE 11

Slide 11 EBTW 2005, Tallinn, Estonia

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Revised DSLAM Test Model

STINGER FS+ STINGER FS+

TRAFFIC SINK TRAFFIC SOURCE DUT DSLAM CAPTIVE CPE Modules (SOURCE & DESTINATION) DATA DATA DATA DATA

  • Key measurements remain

the same.

  • Data path through DSLAM is

unchanged.

  • Improved test repeatability &

tester reliability.

  • Reduced tester cost.
  • Reduced tester footprint.
  • Key measurements remain

Key measurements remain the same. the same.

  • Data path through DSLAM is

Data path through DSLAM is unchanged. unchanged.

  • Improved test repeatability &

Improved test repeatability & tester reliability. tester reliability.

  • Reduced tester cost.

Reduced tester cost.

  • Reduced tester footprint.

Reduced tester footprint.

  • Upstream/Downstream

throughput rates.

  • Synchronization speed.
  • Line Attenuation.
  • SNR (Signal to Noise Ratio).
  • Noise Margin.
  • Upstream/Downstream power.
  • Bit Error Rate (BERT)

performance.

  • Upstream/Downstream

Upstream/Downstream throughput rates throughput rates. .

  • Synchronization

Synchronization speed speed. .

  • Line Attenuation

Line Attenuation. .

  • SNR (Signal to Noise Ratio)

SNR (Signal to Noise Ratio). .

  • Noise Margin

Noise Margin. .

  • Upstream/Downstream power

Upstream/Downstream power. .

  • Bit Error

Bit Error R Rate ate (BERT) (BERT) performance performance. .

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SLIDE 12

Slide 12 EBTW 2005, Tallinn, Estonia

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CPEM - Adoption

Initially developed as a Manufacturing Test Solution. Now adopted by:

  • Design Groups:
  • Design Verification Testing.
  • Product Reliability:
  • Product Verification Testing.
  • Software Quality:
  • Software Quality Testing.
  • Field Service Organisation:
  • On site customer product verification.
  • Chipset Vendor:
  • Product Verification Testing.
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SLIDE 13

Slide 13 EBTW 2005, Tallinn, Estonia

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Summary

Brief introduction to DSL. What a DSLAM does, and how it fits into the greater network. How we used to test DSLAM’s, and the problems with it. The CPEM:

How it solved some of the problems of DSLAM test. Key features of the design. Key beneifts. How it fits into the (revised) test model. Who else is using it.

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SLIDE 14

Slide 14 EBTW 2005, Tallinn, Estonia

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QUESTIONS?