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inside the South Street
Seaport complex in lower Manhattan. The Monticello public field trials used Timex technology which was incompatible with the trans-European standard, while the South Street Seaport indoor test used equipment from Ferranti, GPT, and Motorola, which at the time manufactured CT2 equipment for the Singapore and Hong Kong markets. GPT and Motorola both provided CT2 equipment for the Rabbit system rollout (GPT handset and charger shown above). All the testing was under an FCC Experimental license. The ACT/Cellular 21 "Petition for Rulemaking" (RM-7152), along with a later petition by
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paths between two widely separated channels (up to 45 MHz in some cellular systems), but also placed an upper limit on the range of CT-2 signaling, since the speed of light (and radio signals) prevented long transmission paths. However, the use of TDD made available many frequency bands for CT-2 use, since a "paired" return path was not needed.
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Canada adopted an enhanced version of CT2, known as CT2Plus, in 1993, operating in the 944–948.5 MHz band. CT2Plus class 2 systems benefited from the use of common signalling channels and offered multi-cell hand-off as well as tracking of devices. Incoming calls could be received anywhere within
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An
American company, Cellular 21, Inc. (later to become Advanced Cordless Technologies, Inc.) headed by broadcaster Matt Edwards, petitioned the FCC to permit the use of CT2 technology in the US. ACT built two active test systems which were located in Monticello, New York (outdoor), and outside and
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CT2, as used in Europe and Hong Kong, required adherence to the MPT 1322 and MPT 1334 technical standards. Most striking was the use of TDD (time-division duplex) channels where one radio channel carried both sides of a duplex telephone conversation. This solved the problem of different propagation
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Once out of range of the home, the CT2 user could find signs indicating a network base station in the area, and make outgoing calls (but not receive calls) using the network base station. Base stations were in a variety of places, including high-streets and other shopping areas, gas stations, and
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The advantages to the user were that the rates were generally lower than cellular, and that the same handset could be used at home and away from home. The disadvantages, compared to cellular, were that many networks did not deliver incoming calls to the phones (Bi-Bop was an exception), and that
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Typical CT2 users were sold a handset and base station which they could connect to their own home telephone wiring. Calls via the home base station would be routed via the home telephone line and in this configuration the system was identical to a standard cordless phone, for both incoming and
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Outside Europe, the system achieved a certain amount of popularity in Hong Kong with three operators offering service from 1991, until licenses were terminated in 1996. A CT2 service was offered in
Singapore from 1993 to 1998 by
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is a cordless telephony standard that was used in the early 1990s to provide short-range proto-mobile phone service in some countries in Europe and in Hong Kong. It is considered the precursor to the more successful
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system is CT2's successor, and also supports full microcellular service and data. However, to date DECT has been used to provide commercial mobile-phone like service only in Italy in 1997-8 (the FIDO network).
209:, unlike DECT it does not support "forward handoff", meaning that it has to drop its former radio link before establishing the subsequent one, leading to a sub-second dropout in the call during the handover.
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transport hubs such as rail stations. In this configuration, callers would be charged a per-minute rate which was higher than if they made calls from home, but not as high as conventional cellular charges.
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network ran from 1991 to 1997. In the
Netherlands, Dutch incumbent PTT deployed a CT2-based network called Greenpoint from 1992 to 1999; in the first year it used the name and mascot
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Unlike DECT, CT2 was a voice-only system, though like any minimally-compressed voice system, users could deploy
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system based on the standard which was specified in
Department of Communication document RSS-130 Annex 1.
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technology to share carrier frequencies between handsets and base stations. Features of the system are:
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but royalties proved prohibitively large and the mascot was dropped. The service continued under the
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Apple PowerBop, a variant of the PowerBook incorporating a CT2-compatible modem for use with the
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Cordless
Telephony: The Future of Analogue and CT2 Cordless Telephony in the United Kingdom
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CT2 was deployed in a number of countries, including
Britain and France. In Britain, the
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Zonephone system was the first public network to go live in 1989, and the much larger
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280:(NMT). Since 31 December 2008, CTA1 and CTA2 based phones are forbidden in Germany.
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CT2 network. Although CT2 is a microcellular system, fully capable of supporting
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service was available for a short time in the 1980s before being superseded by
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This article is about the cordless telephony standard. For other uses, see
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Report on
Digital Cordless Networks from 1992 (Dr. Walter H. W. Tuttlebee)
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Greenhopper, with at one time over 60,000 subscribers. In
Finland, the
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In the United States, a system similar to DECT and PHS called
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Telecommunications in Asia: Policy, Planning and
Development
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500 frames/second (alternately base station and handset)
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system. CT2 was also referred to by its marketing name,
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There are no known open CT2 networks still running.
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56:. Unsourced material may be challenged and removed.
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244:magazine, London, April 1988: Ferranti ZonePhone
346:was developed but never deployed commercially.
260:– operated from 1992 to 1993. In France, the
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116:Learn how and when to remove this message
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511:SingTel to Scrap Uncompetitive Callzone
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304:their areas of use were more limited.
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54:adding citations to reliable sources
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552:Mobile telecommunications standards
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185:Up to 100 metre (300 ft) range
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16:1990s cordless telephony standard
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360:Personal Communications Services
256:network – backed by Hong Kong's
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221:Rabbit handsets and chargers
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317:Personal Handyphone System
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393:Knowledge France: Bibop
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166:100 kHz carriers
424:Stephen Wolff on PHS
213:Deployment and usage
50:improve this article
21:CT2 (disambiguation)
496:Ure, John (1995).
483:2009-07-08 at the
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453:Telepoint Services
429:2006-08-19 at the
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48:Please help
43:verification
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547:Local loop
541:Categories
399:References
335:offered a
270:brand name
76:newspapers
138:Telepoint
481:Archived
427:Archived
422:Cisco's
366:See also
356:Millicom
315:Japan's
290:Callzone
250:Ferranti
242:Time Out
199:PowerBop
144:Overview
274:Pointer
233:network
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90:scholar
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262:Bi-Bop
254:Rabbit
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97:JSTOR
83:books
65:"CT2"
344:PACS
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388:CT1
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52:by
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