Slide 1EBTW 2005, Tallinn, Estonia

EBTW05

DSL CPE Module

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

Slide 2EBTW 2005, Tallinn, Estonia

EBTW05 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.

Slide 3EBTW 2005, Tallinn, Estonia

EBTW05 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 distancedistance 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.

Slide 4EBTW 2005, Tallinn, Estonia

EBTW05 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 = DSLDSL AAccess ccess MMultiplexer.ultiplexer.•• Aggregates Aggregates connections from many customers onto a single, connections from many customers onto a single,

highhigh--capacity connection capacity connection ononto to the IP or ATM networkthe IP or ATM network..•• FlexibleFlexible and able to support multiple types of DSL in a single and able to support multiple types of DSL in a single

central officecentral office..

USER

Slide 5EBTW 2005, Tallinn, Estonia

EBTW05 Original DSLAM Test Model

Upstream data path test (CPE COE):

• Ingress via a bank of CPE devicesconnected to DSLAM DSL modems.

• Aggregated and routed through DSLAM.

• Egress onto the ATM backbone.

Upstream data path test (CPE COE):

• Ingress via a bank of CPE devicesconnected to DSLAM DSL modems.

• Aggregated and routed through DSLAM.

• Egress onto the ATM backbone.

STINGER FS+

DUT DSLAM

DATA

DESTINATIONCPE DEVICES

TRAFFIC SINK

DA

TA

SOURCE CPEDEVICES

TRAFFIC SOURCE

DATA

DA

TA

Downstream data path test (COE CPE):

• 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 (COE CPE):

• ATM ingress via a copper or fibre trunk.

• Routed through DSLAM.

• Egress via bank of CPE devices connected to DSLAM DSL modems.

Slide 6EBTW 2005, Tallinn, Estonia

EBTW05 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 ratesUpstream/Downstream throughput rates..•• SynchronizationSynchronization speedspeed. . •• Line AttenuationLine Attenuation..•• SNR (Signal to Noise Ratio)SNR (Signal to Noise Ratio)..•• Noise MarginNoise Margin..•• Upstream/Downstream powerUpstream/Downstream power..•• Bit Error Bit Error RRateate (BERT) (BERT) performanceperformance..

Slide 7EBTW 2005, Tallinn, Estonia

EBTW05 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 SolutionModular Solution –– nothing nothing ‘‘off the shelfoff the shelf’’..

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

Slide 8EBTW 2005, Tallinn, Estonia

EBTW05 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 SolutionModular Solution –– nothing nothing ‘‘off the shelfoff 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.

Slide 9EBTW 2005, Tallinn, Estonia

EBTW05 CPEM – Key FeaturesKey Features:• Based on Conexant Argon 330 reference design. Provides:

o xDSL WAN interface, and o IP LAN interface.

• 28 single channel (identical) CPE devices on 1 card.o 24 usable at any time (4 spares).

• Individually upgradeable firmware.

Key FeaturesKey Features::•• Based on Conexant Argon 330 reference design. Provides:Based on Conexant Argon 330 reference design. Provides:

oo xDSL WAN interface, and xDSL WAN interface, and oo IP LAN interface.IP LAN interface.

•• 28 single channel (identical) CPE devices on 1 card.28 single channel (identical) CPE devices on 1 card.oo 24 usable at any time (4 spares).24 usable at any time (4 spares).

•• Individually upgradeable firmware.Individually upgradeable firmware.

Slide 10EBTW 2005, Tallinn, Estonia

EBTW05 CPEM – Key Benefits

Key benefits:• Out the box ADSL2+ support.• Uses DSLAM form factor.• Firmware upgradeable for:

o Support of multiple DSL flavours, ando Future compliance to emerging DSL standards.

• Multiple configuration modes supported:o HTTP (Web Browser)o CLI/CIT.

o Over LAN, ando 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:

oo Support of multiple DSL flavours, andSupport of multiple DSL flavours, andoo Future compliance to emerging DSL standards.Future compliance to emerging DSL standards.

•• Multiple configuration modes supported:Multiple configuration modes supported:oo HTTP (Web Browser)HTTP (Web Browser)oo CLI/CIT.CLI/CIT.

oo Over LAN, andOver LAN, andoo Over serial connection.Over serial connection.

•• Eliminates dependence on OEM CPE devices.Eliminates dependence on OEM CPE devices.

Slide 11EBTW 2005, Tallinn, Estonia

EBTW05 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 ratesthroughput rates..

•• SynchronizationSynchronization speedspeed..•• Line AttenuationLine Attenuation..•• SNR (Signal to Noise Ratio)SNR (Signal to Noise Ratio)..•• Noise MarginNoise Margin..•• Upstream/Downstream powerUpstream/Downstream power..•• Bit Error Bit Error RRateate (BERT) (BERT)

performanceperformance..

Slide 12EBTW 2005, Tallinn, Estonia

EBTW05 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.

Slide 13EBTW 2005, Tallinn, Estonia

EBTW05 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.

Slide 14EBTW 2005, Tallinn, Estonia

EBTW05

QUESTIONS?