1 any to any connectivity for everyone? (communication hub model) len bytheway australian...
Post on 11-Jan-2016
216 Views
Preview:
TRANSCRIPT
1
Any to Any Connectivity For
Everyone?(Communication Hub Model)
Len BythewayAustralian Communication Exchange
Welcome
2
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?
If it ain’t broke…?
3
• 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
About the TTY
4
• 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
TTY Standards?
5
• 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
6
• Emerging Technologies
incompatible with TTYs
• Wireless local loop (WLL) &
Internet telephony as standard
telephone services (STS)
• NGN & IP services?
Problems with TTY
7
• 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?
The Future Textphones?
8
• 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 Issue
9
How can we migrate to digital technologies and
phase out legacy technologies?
without disruption or loss of services
Real Question
10
a
V.18 modems
TextDirect (UK)
a
a
Dials 18001 nnnnnnnn
Dials nnnnnnnn
18001 routes to TXD
a
Voice Network
11
a
Voice Network
IP Relay (USA)
a
Internet
a
Relay Service
aa
Access Directory Server
a
V.18
12Proposal for Australia
a
Switchednetworks
a
IPnetworks
Access DirectoryServer
a
V.18 andother bridges
Relay Services
“Communications Hub”
a
a
a
a
a
Video
aa
a
NGNReqs?
13
• 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.
Not “Out of the Box”
14
• 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
Beyond Technology
15
• Stakeholder consultation and buy-in:
• People with Disabilities
• Broader community
• Telco Industry
• Legislators/Regulators
• Refine the model
• ACIF Forum to discuss options - early 2002
The Way Forward?
16
Questions?
Thank You
www.aceinfo.net.au
top related