International Telecommunication Union
V.18
The bridge between old and future
communication for deaf people
Products & Concepts
George Skorkowski
DSPG/Sensory Communication
Plenary Session on ITU-T Standards
15th Biennial TDI International Conference –
Las Vegas, Nevada, USA
Contents
ITU-T •V.18 practical aspects & misconceptions
•Current developments in V.18 Recommendation
•Consumer products based on V.18 technology
•V.18 Mobile access
•Simultaneous Voice and Text products
•Service type products based on V.18
technology
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15th Biennial TDI International Conference – Las Vegas, Nevada, USA
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ITU-T
V.18
Practical aspects of the
standard and general
misconceptions about it
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Why V.18 ?
ITU-T International standard
- Accepted as a standard in all European countries,
Australia & New Zealand
Bridge between old and new technologies
- Higher speed modems
- Multimedia
Inter-working
- Can inter-work with any existing text Telephone
- Future global integration with Internet & Multimedia
Ease of use
- More reliable call set-up
- User friendly operation
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V.18 Modes
ITU-T
Compatibility Mode
V.18 Mode
Used with existing Textphones
Used between two
V.18 Textphones
- V.21 (Sweden, UK)
- Baudot (45 and 50bps) (USA, UK, Ireland)
- EDT (Italy,Germany)
- Bell 103 (USA)
- V.23 (France)
- DTMF (Denmark, Sweden, Netherlands)
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Current development of V.18
ITU-T •CTM Mobile access for the textphones
•Simultaneous Text & Voice
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ITU-T
V.18
Conformance testing to the standard
Why it is important
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Why V.18 Conformance testing is Important
ITU-T  Specified in V.18 Recommendation Appendix 4
 Ensures interworking between textphones
Small volumes and lack of competition between
textphone manufacturers means they are not subject to
the same market forces to ensure interoperability.
 Benefits the deaf and hard of hearing
To maximise the benefits of V.18, all features should be
implemented - automoding, all compatibility modes,
V.18 universal transfer mode, etc. Verification of
various implementations ensures these benefits are
gained.
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Why V.18 Conformance testing is Important
ITU-T Reduces complaints about textphones
- Tighter control of textphone quality in the market
ensures better reliability of textphone operation and
reduces failure rate.
Benefits V.18 implementers
- Allows verification of the implementation.
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V.18 based Text Telephony Products
ITU-T V.18 conformance Tester
Applications:
Verification of proper implementation of V.18
according to the
Appendix 4 of V.18 ITU-T Recommendation
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ITU-T
Review of some of existing
legacy text telephone products
used in Europe
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Existing Text Telephony Products
ITU-T
Type: DTS
Manufacturer: Ecotron (Italy)
View: Front
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Existing Text Telephony Products
ITU-T
Type: Uniphone
Manufacturer: Ultratec (USA)
View: Front
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Existing Text Telephony Products
ITU-T
Type: Qwerty phone
Manufacturer: BT Merlin (UK)
Status: discontinued
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Existing Text Telephony Products
ITU-T
Type: Minicom pro 400
Manufacturer: Ultratec (USA)
View: Front
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ITU-T
V.18
Implementation of the standard
Products & Concepts
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TextLink Mobile textphone
Speaker
ITU-T
Microphone
(optional)
DC
Power
Ultra bright
LED
Line In
Expansion Port
(incl. Printer port)
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GSM Mobile Port
Ext Telephone
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TexLink Mobile main features
ITU-T
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Two modes of operation
- PSTN
( includes parallel phone support)
- Mobile supports any type of GSM phone with
hands-free interface
Incoming Call Indicator
Two lines by 40 characters Text display
 Emergency Alarm Button (only in PSTN mode)
Full implementation of V.18 protocol in PSTN
Full implementation of CTM in Mobile mode
 Standard & Custom Automatic Greetings (Voice & text)
CLI and Call Sign implementation
Future-proof, no proprietary chips (software driven)
- Remote Upgrade Via Telephone Line
Easy maintenance
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Examples of TextLink Mobile use
ITU-T
Home stationary use
with optional telephone pedestal
Portable use
with “Filofax” type case &
optional mobile phone
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PC Link working environment
RRS232 cable
ITU-T
Features
Emulates Texlink keyboard display and function
keys on any PC via Com-port interface
Allows touch typing in the office environment
Selection of fonts for vision impaired deaf persons
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PC Link working environment
ITU-T
TexLink Function keys emulated on the screen
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TextLink 800 portable V.18 Modem
ITU-T
Lighter for comparison only
Features
–Com-port connection to laptop/palm top PC.
–Battery or mains operated.
–Full implementation of V.18 & CTM Recommendations
–User friendly GUI,
–Long battery (PP3) operation
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ITU-T
V.18
CTM Mobile Access
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TextLink Mobile textphone
Speaker
ITU-T
Microphone
(optional)
DC
Power
Ultra bright
LED
Line In
Expansion Port
(incl. Printer port)
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GSM Mobile Port
Ext Telephone
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TextLink 600 Mobile adapter
ITU-T
Allows some selected textphones
(only available in USA)
to be connected to
a mobile phone
Q-90 textphone
Textlink 600
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ITU-T
V.18
Simultaneous Voice & Text
Relay Server
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TextLink 9200 Simultaneous Voice & Data
ITU-T
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Combines V.18 and Simultaneous Voice & Data
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Textlink 9100 mobile applications
ITU-T
Textlink user
Textlink user
Other textphone user
SMS messages
FAX
email messages
TexGate server
TexBox
LAN
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Call centre operator
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ITU-T
Wireless
Home monitoring,
security & panic alarms
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Textlink 9100 home security centre
ITU-T
Vibrating
Pad
PIR
Detector
Smoke
Detector
Panic Button
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Door Sensor
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ITU-T
V.18
Implementation of standard
Commercially available Products
in Services aimed at deaf people
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What is TexBox?
ITU-T
TexBox is a text gateway which connects hard of
hearing, deaf or speech impaired customers who use
textphones, to almost anyone in the organisation or
business via existing internal computer network (LAN or
WAN), where the textphone call is routed via menu
system to a relevant person’s PC.
Tower Based System
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Rack Based System
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TexBox Specification
ITU-T
TexBox is a stand-alone solution with no need for
integration with existing call centre equipment.
PC platform running Linux (Unix).
Custom designed and built V.18 hardware text
modems which connect to standard analogue
telephone lines.
Connection to the local area network via
10/100 Base T Ethernet connection.
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Advantages of TexBox
ITU-T
Elimination of textphones in the organisation.
User friendly.
No additional software to be installed on the users
PC’s.
Internal text calls between deaf and hearing
colleagues.
Stores personal or group messages from incoming
calls.
Incoming call & text conversation transfers.
Low maintenance costs.
Simple training.
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TexBox Communicator
ITU-T
Call dialler
User login/
logout
Message
handling
User settings
Save
conversation
Conversation
window
Internal call/
Call transfer
Status bars
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TexGate V.18/Mobile Server
ITU-T
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Applications:
Email, Fax, SMS
Banking, shopping etc
Instant messaging
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V.18/CTM Global Integration
ITU-T
Information
Service
Internet Mail
Service
V.18 Textphone
Internet
PC & V.18 Modem
V.18 Gateway
Any Textphone
Information
Gateway
Text to/from Voice
Service
Standard Telephone
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ITU-T
Thank You
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