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2007 APTA Rail Conference. Voice Over IP For Light Rail Communications Systems. Chris Bosse, PMP Stantec Consulting, Inc. Senior Systems Consultant. 2007 APTA Rail Conference. IP Services For Light Rail. Landline Voice Services . Radio. 2007 APTA Rail Conference. VoIP Basics.

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2007 APTA Rail Conference

Voice Over IP For Light Rail Communications Systems

Chris Bosse, PMP

Stantec Consulting, Inc.

Senior Systems Consultant


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2007 APTA Rail Conference

IP Services For Light Rail

Landline Voice Services

Radio


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2007 APTA Rail Conference

VoIP Basics

• IP Network

• Telephony Switch(es)

• Telephones


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2007 APTA Rail Conference

VoIP Basics – IP Network

• Ethernet over SONET

• Carrier Ethernet (GigE)

• VPN over DSL(Leased)

• MPLS, RPR

• 1.5 Mbps – 10 Gbps

backbone rate

• 5 – 100 kbps per call

  • DESIGN

  • KEYS

  • Low Latency

  • QoS Assurance

  • Fast Re-route

  • Link Bandwidth


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2007 APTA Rail Conference

VoIP Basics – Switch(es)

• Traditional PBX

• Hybrid PBX

• IPBX

• Call Manager

• Hosted Services

  • DESIGN

  • KEYS

  • Standards Based

  • Interoperability

  • Easy MAC’s

  • Management

  • Redundancy

  • PSTN Interface


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2007 APTA Rail Conference

VoIP Basics – Telephones

• IP Telephone

• Softphone

• Analog / Digital sets

and FAX

(w/ conversion)

  • DESIGN

  • KEYS

  • Standards Based

  • Power

  • Security

  • Features


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2007 APTA Rail Conference

Native IP Configuration

IP Phone

Analog Phone

Wireless Access Point

FAX

PSTN

T1, PRI

VoIP

Converter

Analog Phone

Hub / Switch

Hub / Switch /

IPBX

Gateway

IP

NETWORK

ETHERNET

VoIP Server /

Softswitch /

Call Manager(s)

Fiber Optic

Media

Converters

IP Phones

VoIP

Converter

IP Phone’s

Softphone

Emergency

Telephone


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Hub / Switch

IP

NETWORK

2007 APTA Rail Conference

IP Conversion Configuration

Analog Phone

VoIP

Converter

FAX

Wireless Access Point

PSTN

FXS

PABX

VoIP

Converter

T1, PRI

FXO

Hub / Switch

Analog Phones

VoIP Gateway

Fiber Optic

Media

Converters

PBX Stations (non-IP)

VoIP

Converter

Emergency

Telephone


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2007 APTA Rail Conference

VoIP Challenges for Light Rail

• Standards (Rail)

• Emergency Telephone Service

• Quality of Service

• Security

• Interoperability

• Remote Wayside Power


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2007 APTA Rail Conference

VoIP Benefits

• Voice/Data convergence

• Network efficiency

• Scalable initial CAPEX

• Bring maintenance in-house

• Greatly simplify network cabling

• Reduce equipment footprint

• Consolidate maintenance skill sets

• Streamlined disaster recovery & backup

• Advanced IP phone applications


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2007 APTA Rail Conference

2007 APTA Rail Conference

Case Study – Sound Transit Seattle, WA

Spanning Tree Protocol blocks

redundant link until primary failure

Primary Link

COMM NODE

B

COMM NODE

A

ETEL

Passenger Emergency Phone

Emergency Phone


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2007 APTA Rail Conference

Case Study – RTD Denver, CO


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2007 APTA Rail Conference

Case Study – Tri-Met Portland, OR


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2007 APTA Rail Conference

Case Study – Valley Metro Phoenix, AZ

Station

GigE Node

To Next

GigE Node

To Next

GigE Node

Ethernet Switch

Wayside

Substation, Signals

Facilities

10/100BaseTX

VoIP Gateway

PA/VMB

Controller

VoIP Gateway

Other

Data

CCTV

FXS

FXS

TVM

SCADA

Emergency

Call Boxes

Analog

Telephones


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2007 APTA Rail Conference

Chris Bosse

Stantec Consulting, Inc.

105 Decker Court – Suite 810

Irving, TX 75062

(972) 650-6166


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