Transcript Communication Hub Model

Welcome
Any to Any
Connectivity For
Everyone?
(Communication Hub Model)
Len Bytheway
Australian Communication Exchange
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If it ain’t broke…?
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There are tens of thousands
of textphones (TTYs) used in
Australia and hundreds of
thousands used in the USA -
they work and people love
them… why change?
About the TTY
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• TTYs were developed from old teletype machines
discarded (EOLed) in the 1960s. They operate:
• 50 bits/sec (45.45 in the USA)
• Use 5 bit Baudot code (Dev’t 1874)
• No Carrier
• Half Duplex
• Some can be acoustically coupled
• They are basic, cheap and work consistently
TTY Standards?
• World has adopted multiple textphone standards
• European Deaf Telephone (EDT)
• Minitel (V.23 based systems x 3)
• DTMF (phone dial tones)
• ASCII (V.21, Bell 103 @300 baud)
• Baudot TTYs (50 & 45.45 baud)
• Australia is the only country in the world currently
“standardised” on 50 baud Baudot TTYs
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Problems with TTY
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• Lack of TTY access via mobile
networks (esp. to text
Emergency Call Service 106)
• Deaf people have ‘adopted’
mobile phone technology SMS (reliability issues)
Problems with TTY
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• Emerging Technologies
incompatible with TTYs
• Wireless local loop (WLL) &
Internet telephony as standard
telephone services (STS)
• NGN & IP services?
The Future
Textphones?
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• Availability of V.18 standard (ITU)
brings all text telephones
together
• Development for text & video
standards for Internet (using
H.323 video standard, eg
Microsoft NetMeeting)
• SIP, ENUM and text access?
Real Issue
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• Large installed base of TTYs
• TTYs dispersed, can’t be located to
swap out
• Vital services on baudot infrastructure
(health, welfare & emergency services,
education, social, family…)
• Let’s not confuse the Form Factor (TTY)
with the underlying Protocol (Baudot)
Real Question
How can we migrate to
digital technologies and
phase out legacy
technologies?
without disruption or loss of
services
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TextDirect (UK)
Dials 18001 nnnnnnnn
Voice Network
18001 routes to TXD
V.18 modems
Dials nnnnnnnn
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IP Relay (USA)
V.18
Internet
Access Directory Server
Voice Network
Relay Service
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Proposal for Australia
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NGN
Reqs?
W
IP
networks
Video
Relay Services
V.18 and
other bridges
Access Directory
Server
“Communications Hub”
Switched
networks
SM S
Not “Out of the Box”
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• Do it once for all Australians on any network
• Modular - parts installed as needed
• The hub is “organic” - growing with
technology
• Protects against future technology changes
• Allows people to take up the new, but stay
connected to the old.
Beyond Technology
• On solution does not work for all - people need
choices
• Use mainstream solution where possible
• More than ever we will need:
• Awareness
• Training
• Support
• New challenges to assure privacy
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The Way Forward?
• Stakeholder consultation and buy-in:
• People with Disabilities
• Broader community
•
Telco Industry
• Legislators/Regulators
• Refine the model
• ACIF Forum to discuss options - early 2002
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Thank You
Questions?
www.aceinfo.net.au
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