From the Clean Room to the Great Outdoors

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From The Clean Room to the Great OutdoorsDeploying Telecoms Equipment in hostile Environments


The Journey

Exchange Deployment

Technology: ADSL2+

Homes Passed: 3,000 – 40,000

Service offering ≤ 24Mbps

FTTCabinet Deployment

Technology: VDSL2

Subscribers: 100 – 400

Service offering ≤ 100Mbps

FTT-DP / FTTBasement

Technology: G.fast

Subscribers: 1 - 96

Service offering ≤ 500MbpsHigh

Low

Cost Per SubscriberTime to Market

Phase 1 Phase 2 Phase 3

Fast SuperFast UltraFast


The Clean Room

Air Quality Control- ISO 14644-1 & ASHRAE standards- Particles per Cubic Meter- Humidity levels- Temperature

Power- Source Diversity- Robust Failover Procedures

Communications- Diverse building entry for critical links- Diverse in-building routing of cables

Security- 24x7 Manned or Automated Security- Zero Public Access

Key Attributes of the Local Exchange


First Steps Outside The Mini Clean Room

- Closed System - Microclimate* Heat Exchanger to exhaust heat No Direct airflow though equipment

Matching Equipment- The same Active broadband

equipment as in the Exchange- The same passive equipment

Localised Power Solution- Usually Single AC supply- Local Rectifiers- Local Backup Batteries

Relative Security- Locked and Alarmed Doors

* Some Choose Forced Air Cooled Open Systems


Leaving the Goldilocks Zone – OSP DSLAM

Initially Developed for the Under-Served- Rural – Low Density Broadband- Minimal Deployment & Operational Costs- Single Technician Turn-up- Flexible Deployment Options

Purpose Built for Extremes- Self Contained Microclimate- Broad Operating Temperature range- Hermetically Sealed- Completely Solid State- Zero Routine Maintenance- Ballistics Grade Enclosures

Established Option for VDSL2 Roll-out- Reduced Time to Market- Lower Operational Costs- Reduced Dependencies on Utilities & Fibre Backhaul

1st Gen 1124

(ADSL)

2nd Gen 1148

(ADSL2+)

3rd Gen Solutions

(ADSL2+/VDSL2)

4th Gen Solutions

(VDSL2 w/ vectoring)

G.fast DPUs


We’re Not in Kansas Anymore

Temperatures- Operating range -40C to +70C- Substantial Daily Temperature Swings- Solar Loading- Convection Cooling

Power- Dirty Power Sources- Frequent Micro Outages- Exposure to lightening Strikes

Security- Out of Reach Pole Mounting- Out of Sight Chamber Mounting- Passive Cabinet Exterior Mounting


What Have We Learned?

View an OSP as a System- The Power, Uplinks, Fixtures, Cables - The Weakest Link can Down the System

A Power glitch can equal a reboot ~10 Minute TV interruption

Factor in System Testing Margin- Exceeding the System Rating Regardless of Component

Specifications

Component Suitability- Operating Temperatures Push the Limits of Most- Temperature swings reveal any weaknesses- Broader Recognition of the New Extremes Required from

Component Vendors


97.70%

99.98%

96.50%

97.00%

97.50%

98.00%

98.50%

99.00%

99.50%

100.00%

100.50%

X5R (85C) X7R (125C)

Rel

iab

ilit

y i

n %

Ceramic Capacitor

Ceramic Capacitor Reliability

Improvement

• Initial Design Used a X5R (85C) Ceramic Capacitor in VDSL DSLAM

• Unit Operating Specification -40C to +70C

• Early Customer Returns Data Dictated the need to use X7R (125C)

An Example of Tailored Component Selection


What Have We Recognised?

Collaboration Between Procurement and R&D- Standardising on the minimum range of components not always possible- Physical Dimensions and Temperature considerations more pronounced

in the cramped space inside an OSP

Supply Chain Control- When your Supplier’s Supplier Makes Material or Process Changes

Is Corrosion Resistance Compromised?

Is Operating Temperature Range Reduced?

Is the Thermal Output Increased

- Individual Application Testing of Each Alternative Component


What Have We Changed Ourselves?

Supply Chain Change Control- Stringent Supplier Change Control Procedures- System Focused Component Selection Criteria- Tight Collaboration Between Procurement and Engineering

Assembly Quality Control- Criteria for Material Selection for Connectors, Adhesives, and Solders- Adopted Stringent Controls over Component Dimensions

Flexibility vs Reliability- Field Service Options Compromise Enclosure Integrity

Failures from Incorrect Closure Outweigh Component Failures

Component Quality Improvements Can Negate Field Replacement

Requirements


What Have We Shared? Increased Customer Education on Deployment Risks

“Any Colour you like so long as it’s White” Painting Green or Brown significantly alters performance under Solar Load conditions.

Mounting locations can Impact Airflow Enclosed Spaces Impede Heat Exhaust Covers, Lids, Camouflage & Mounting Direction

can all prevent Convection

Cable Routing & Securing Avoid Sheathing Abrasion Prevent Water ingress

Reduce Cable Related Failures

Corrosion Awareness Salt Fog in Coastal Regions Attacks Every Weak Point Standing Salt Water in Chambers - Common in Snow Prone Regions Directly Buried Equipment at High Risk From Corrosive Materials UV Damage Will Quickly Destroy Inferior Materials


Key Takeaways

G.fast will Demand OSP Deployment due to Proximity and Economic

Constraints

OSPs Bring the Required Expediency and Predictability To Deployment

Schedules

Tight Supply Chain Controls Critical to Preventing Unwanted Post

Deployment Surprises

When Installed per the Guidelines OSPs Deliver Exceptional Customer

Experiences for Decades

We Hope Our Experience Aids Your Journey out of the Clean Room

From the Clean Room to the Great Outdoors

Technology

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