WO1997041699A1 - Subscriber terminal arrangement - Google Patents

Subscriber terminal arrangement Download PDF

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Publication number
WO1997041699A1
WO1997041699A1 PCT/SE1997/000503 SE9700503W WO9741699A1 WO 1997041699 A1 WO1997041699 A1 WO 1997041699A1 SE 9700503 W SE9700503 W SE 9700503W WO 9741699 A1 WO9741699 A1 WO 9741699A1
Authority
WO
WIPO (PCT)
Prior art keywords
arrangement according
subscriber terminal
radio
terminal
power supply
Prior art date
Application number
PCT/SE1997/000503
Other languages
French (fr)
Inventor
Torbjörn JOHNSON
Martin STRÖM
Original Assignee
Radio Design Innovation Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Radio Design Innovation Ab filed Critical Radio Design Innovation Ab
Priority to AU23139/97A priority Critical patent/AU2313997A/en
Publication of WO1997041699A1 publication Critical patent/WO1997041699A1/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/14—WLL [Wireless Local Loop]; RLL [Radio Local Loop]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to a subscriber terminal arrangement in a telecommunication system utilizing radio in the local loop.
  • Radio in the Local Loop is, substi- tuting the copper lines in the local loop, the part of the network which is between the local exchange and the sub ⁇ scriber at home, with radio.
  • the market for these applica ⁇ tions is enormous, especially in the new growing economies like Far East, Russia and Brazil.
  • Another growing market is the industrial countries where radio is the best solution for a new operator to compete with services in the local loop.
  • Fixed subscriber terminals mean terminals which are not designed for mobility purpose. The terminal is placed in the home, office etc. and can be moved in the in the pre- mises but not like hand held portable telephone. Ordinary telephone equipment, telephone fax, answering machine, data modem, PCs etc, could be connected to the terminal. In some cases the radio parts and telephony parts would be inte ⁇ grated in the same unit .
  • POTS Plain Ordinary Telephony System
  • the present invention solves the above-mentioned problem by providing an improved subscriber terminal arrangement .
  • the unique features of the subscriber terminals are based on:
  • PCM coding (Pulse Code Modulation) which can offer: + high quality audio 7, 2 kHz bandwidth compared with today's 3,1 kHz bandwidth for today's POTS (Plain Ordinary Telephony System)
  • the present invention provides a subscriber ter- minal arrangement in a telecommunication system utilizing radio in the local loop.
  • the arrangement comprises a subscriber terminal comprising a low power radio part, a pulse code modulation air interface and a low power paging channel for the call set-up procedure, a power supply part, and a user terminal comprising a hand-set and a dialling device.
  • Figure 1 is a block diagram of a first embodiment of the invention for ordinary POTS
  • Figure 2 is a block- diagram of a second embodiment of the invention in which the subscriber terminal equipment and the telephony equipment are integrated in the same physical unit;
  • Figure 3 is a block diagram of a third embodiment of the invention in which the radio part and the power supply unit are integrated in the same unit;
  • Figure 4 is a block diagram of a fourth embodiment of the invention including a multi-subscriber terminal; and Figure 5 is a block diagram of a further embodiment of the invention in which the RF part is integrated with the antenna.
  • All the terminals are based on low power radio with 0,1 W output. Both families could either be connected to an or ⁇ dinary power supply unit, utilising the mains power supply, or an independent power supply unit. This unit is utilising solar/wind energy and rechargeable batteries. All terminals are utilising a low power paging channel for implementing the alert function. This sleep mode function results in very low power consumption between calls. Therefore, the termi ⁇ nals could be used with powering from only solar/wind energy and batteries.
  • the paging channel will be used in the call set up procedure i. e. the dialled number will transferred immediately to the network at the same time as the radio speech channels is allocated. This will result in no delay when the receiver is lifted. and an immediate dial tone is given.
  • the paging function is similar to the POGSAG defacto standard which is capable to transfer 512 baud.
  • the terminals are equipped with a LED indicator, showing red (no radio reception) , yellow (not enough reception) and green (good radio reception) .
  • the copper lines of an ordinary telephone network is replaced by an antenna equip ⁇ ment .
  • the antenna equipment is connected to a subscriber terminal (Subs-terminal) which in turn is connected to the telephony equipment.
  • the subscriber terminal includes the radio.
  • the terminal family is based on a digital radio with 0,1 W output.
  • the service is based on 64 kb/s PCM coded radio channels.
  • the telephony equipment at least consists of a hand-set and a dialling device, such as a key pad. The following services would be offered:
  • the ordinary telephone equipment is connected to a line interface (CCITT recommendation) which would be able to sup ⁇ port an ordinary ringing generator and 2000 meter 2 wire copper cable i.e. 2/4 wire ordinary line interface.
  • CITT recommendation a line interface
  • antenna installa ⁇ tions There are three different versions of antenna installa ⁇ tions :
  • the present invention also provides a simplified sub- scriber terminal; "Proprietary POTS”. There are three diffe ⁇ rent versions:
  • the main difference is the subscriber telephone equip ⁇ ment.
  • One possibility is a telephony equipment, which is specially adapted to the subscriber terminal, without ringing generator and no lightning protection i. e. no standard POTS interface.
  • the ringing signal is generated by a piezoelectric ringer in the hand-set. This would lead to a less complex implementation and therefore a reduction in cost because there is no standard line interface circuitry.
  • the distance between the radio subscriber terminal and pro ⁇ prietary telephone equipment is maximum 50 meters.
  • the power supply is 2 W DC. This solution would need a proprietary telephone equipment.
  • Version 2 Another version is where the subscriber terminal equip ⁇ ment and the telephony equipment are integrated in the same physical unit . In order to save cost through simplicity there is no external line interface at all.
  • the implementa ⁇ tion is shown in Figure 2.
  • Radio part and power equipment are integrated in the same unit. This unit should be plugged directly into the wall. There are three in- put/output connections for: external antenna connection, a connection for the telephone equipment and one for DC input (battery backup or in case of no main supply) see Figure 3.
  • antenna connector at the radio terminal for connection of different antenna alternatives.
  • One embodiment of the invention features a radio termi ⁇ nal which would provide ISDN Basic Rate Access, BRA.
  • the terminal can offer two ordinary POTS lines in accordance with the first embodiment .
  • the invention provides a multi-subscriber family suit ⁇ able for apartment buildings or offices, where it is desired to connect several user terminals.
  • This terminal family is also based on low power radio with 0,1 W output.
  • the service is based on 64 kb/s PCM coded radio channel. There will be three different sizes serving up to 4 , 8, 16 and 16-32 subscribers. All versions would provide" the following services: - Ordinary POTS
  • PCM radio channels which will basically serve up to 32 subscribers. There would even be a version which would be utilising concentration i. e. there are fewer radio channel connections than the number of subscribers connected to the terminal. For example 30 PCM channels can support 290 customers (Traffic requirements: 70 mE/customer, 0, 01 % blocking) .
  • the unit consists of :
  • the radio frequency parts are moved from the subscriber terminal unit and are integrated together with the antenna.
  • the radio parts in the RF unit are DC powered (Direct Current) by the subscriber terminal via the antenna cable.

Abstract

The invention relates to a subscriber terminal arrangement in a telecommunication system utilizing radio in the local loop. According to the invention, the arrangement comprises a subscriber terminal comprising a low power radio part, a pulse code modulation air interface and a low power paging channel for the call set-up procedure, a power supply part, and a user terminal comprising a hand-set and a dialling device. Ordinary telephone equipment, telephone fax, answering machine, data modem, PCs etc, may be connected to the subscriber terminal. In some cases the radio parts and telephony parts would be integrated in the same unit. The power supply part may be connected to an independent power supply unit comprising a power generator, e.g. solar panels and/or a wind generator, rechargeable batteries, and a control unit for controlling the charging procedure. The air interface is capable of supporting 64 kb/s PCM coding offering high quality audio, and/or variable data rates up to 64 kb/s.

Description

TITLE OF INVENTION: SUBSCRIBER TERMINAL ARRANGEMENT
FIELD OF THF, INVENTION
The present invention relates to a subscriber terminal arrangement in a telecommunication system utilizing radio in the local loop. Radio in the Local Loop (RLL) is, substi- tuting the copper lines in the local loop, the part of the network which is between the local exchange and the sub¬ scriber at home, with radio. The market for these applica¬ tions is enormous, especially in the new growing economies like Far East, Russia and Brazil. Another growing market is the industrial countries where radio is the best solution for a new operator to compete with services in the local loop. Fixed subscriber terminals mean terminals which are not designed for mobility purpose. The terminal is placed in the home, office etc. and can be moved in the in the pre- mises but not like hand held portable telephone. Ordinary telephone equipment, telephone fax, answering machine, data modem, PCs etc, could be connected to the terminal. In some cases the radio parts and telephony parts would be inte¬ grated in the same unit .
STATE OF THF, ART
Today there are two main categories of radio subscriber terminals; for mobile use and fixed telephones connected to ordinary fixed network for telephony (POTS, Plain Ordinary Telephony System) .
Today's radio subscriber terminals are power-consuming, expensive (due to standardized POTS interface) , bad audio quality, no variable data rates etc. When the receiver is lifted there is a long delay before the dial tone is given. When mobile telephones are used, the subscriber have to enter the number and thereafter have access to the radio channel (the send button is .pressed) .
The present invention solves the above-mentioned problem by providing an improved subscriber terminal arrangement . The unique features of the subscriber terminals are based on:
- 64 kb/s PCM coding, (Pulse Code Modulation) which can offer: + high quality audio 7, 2 kHz bandwidth compared with today's 3,1 kHz bandwidth for today's POTS (Plain Ordinary Telephony System)
+ by multiplexing several (3-4) PCM channels, high quality hi-fi audio is offered + variable data bit rates up to 64 kb/s
+ multiplexing of PCM channels to offer ISDN BRA, Inte¬ grated Services Digital Network, Basic Rate Access
a simplified version of POTS
- multi-user terminals with internal switch functionality in order to reduce the capacity requirement on the network.
- an independent power supply unit where there is no need of external power supply
- low power paging channel giving;
+ low power consumption
+ no delay for giving dial tone when receiver is lifted
an integrated radio head in the antenna
SUMMARY OF THF, INVENTION
Thus, the present invention provides a subscriber ter- minal arrangement in a telecommunication system utilizing radio in the local loop.
According to the invention, the arrangement comprises a subscriber terminal comprising a low power radio part, a pulse code modulation air interface and a low power paging channel for the call set-up procedure, a power supply part, and a user terminal comprising a hand-set and a dialling device.
The invention is set forth in detail in the accompanying claims.
BRIEF DESCRIPTION OF THE DRAWTNCS
The invention is described below with reference to the attached drawings, in which
Figure 1 is a block diagram of a first embodiment of the invention for ordinary POTS;
Figure 2 is a block- diagram of a second embodiment of the invention in which the subscriber terminal equipment and the telephony equipment are integrated in the same physical unit; Figure 3 is a block diagram of a third embodiment of the invention in which the radio part and the power supply unit are integrated in the same unit;
Figure 4 is a block diagram of a fourth embodiment of the invention including a multi-subscriber terminal; and Figure 5 is a block diagram of a further embodiment of the invention in which the RF part is integrated with the antenna.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS There are two main groups of digital radio fixed subscriber terminals:
- the single user terminal family
- a multi-user terminal family
All the terminals are based on low power radio with 0,1 W output. Both families could either be connected to an or¬ dinary power supply unit, utilising the mains power supply, or an independent power supply unit. This unit is utilising solar/wind energy and rechargeable batteries. All terminals are utilising a low power paging channel for implementing the alert function. This sleep mode function results in very low power consumption between calls. Therefore, the termi¬ nals could be used with powering from only solar/wind energy and batteries. The paging channel will be used in the call set up procedure i. e. the dialled number will transferred immediately to the network at the same time as the radio speech channels is allocated. This will result in no delay when the receiver is lifted. and an immediate dial tone is given.
The paging function is similar to the POGSAG defacto standard which is capable to transfer 512 baud. For easy customer installation, the terminals are equipped with a LED indicator, showing red (no radio reception) , yellow (not enough reception) and green (good radio reception) .
In Figure 2, an embodiment of the single subscriber terminal family is shown.
As may be seen from Figure 1, the copper lines of an ordinary telephone network is replaced by an antenna equip¬ ment . The antenna equipment is connected to a subscriber terminal (Subs-terminal) which in turn is connected to the telephony equipment. The subscriber terminal includes the radio.
The terminal family is based on a digital radio with 0,1 W output. The service is based on 64 kb/s PCM coded radio channels. The telephony equipment at least consists of a hand-set and a dialling device, such as a key pad. The following services would be offered:
- Ordinary POTS, including DTMF signalling (Dual Tone Multifrequency)
- Data over modem; 9,6, 14,4 28,8 up to 64 kbit/s - Dedicated data up to 64 kb/s
The ordinary telephone equipment is connected to a line interface (CCITT recommendation) which would be able to sup¬ port an ordinary ringing generator and 2000 meter 2 wire copper cable i.e. 2/4 wire ordinary line interface. There are three different versions of antenna installa¬ tions :
- an antenna connected directly to the user terminal (omnidirectional, radiation in all directions)
- a separate antenna which could be placed in the window (omni/directional, radiation in a specific direction)
- an outdoor roof or wall/roof mounted antenna (directional)
There is an antenna connector at the subscriber terminal for connection of different types of antenna alternatives. The present invention also provides a simplified sub- scriber terminal; "Proprietary POTS". There are three diffe¬ rent versions:
Version 1 The main difference is the subscriber telephone equip¬ ment. One possibility is a telephony equipment, which is specially adapted to the subscriber terminal, without ringing generator and no lightning protection i. e. no standard POTS interface. The ringing signal is generated by a piezoelectric ringer in the hand-set. This would lead to a less complex implementation and therefore a reduction in cost because there is no standard line interface circuitry. The distance between the radio subscriber terminal and pro¬ prietary telephone equipment is maximum 50 meters. The power supply is 2 W DC. This solution would need a proprietary telephone equipment.
The same services as above is offered.
Version 2 Another version is where the subscriber terminal equip¬ ment and the telephony equipment are integrated in the same physical unit . In order to save cost through simplicity there is no external line interface at all. The implementa¬ tion is shown in Figure 2.
Version 3
There is one version where the radio part and power equipment are integrated in the same unit. This unit should be plugged directly into the wall. There are three in- put/output connections for: external antenna connection, a connection for the telephone equipment and one for DC input (battery backup or in case of no main supply) see Figure 3.
There are two different versions of antenna installa¬ tions : - a separate antenna which could be placed in the window
(omni/directional, radiation in a specific direction) - an outdoor roof or wall/roof mounted antenna
(directional) There is an antenna connector at the radio terminal for connection of different antenna alternatives. One embodiment of the invention features a radio termi¬ nal which would provide ISDN Basic Rate Access, BRA. As an alternative the terminal can offer two ordinary POTS lines in accordance with the first embodiment . Similarly, there are three different versions of an¬ tennas.
The invention provides a multi-subscriber family suit¬ able for apartment buildings or offices, where it is desired to connect several user terminals. This terminal family is also based on low power radio with 0,1 W output. The service is based on 64 kb/s PCM coded radio channel. There will be three different sizes serving up to 4 , 8, 16 and 16-32 subscribers. All versions would provide" the following services: - Ordinary POTS
- Data over modem; 9,6, 14,4 28,8 up to 64 kbit/s
- Dedicated data up to 64 kb/s
- One version combining ISDN and POTS.
The later could in a flexible way be tailored' for 16-32 subscribers . Depending on the number of subscribers there are 16-32 64 kb/s PCM radio channels which will basically serve up to 32 subscribers. There would even be a version which would be utilising concentration i. e. there are fewer radio channel connections than the number of subscribers connected to the terminal. For example 30 PCM channels can support 290 customers (Traffic requirements: 70 mE/customer, 0, 01 % blocking) .
The principles of the multi-subscriber terminal family is shown in Figure 4:
In order to not be independent of mains power supply (from the electricity company) there should be an option where the user terminals are connected to an independent power supply unit . The unit consists of :
- Power generator; solar panels or/and wind generator
- rechargeable batteries
- control unit, controlling the charging procedure
There would be one terminal version where the radio frequency parts (RF parts) are moved from the subscriber terminal unit and are integrated together with the antenna. The radio parts in the RF unit are DC powered (Direct Current) by the subscriber terminal via the antenna cable. Thus, the present invention provides an improved sub¬ scriber terminal arrangement having the advantages stated above. Of course, many variations and modifications as well as combinations of the disclosed embodiments will be recog¬ nized by a person skilled in the art. The invention is only restricted by the claims below.

Claims

1. A subscriber terminal arrangement in a telecommuni¬ cation system utilizing radio in the local loop, characterised by a subscriber terminal comprising a low power radio part, a pulse code modulation (PCM) air interface, and a low power paging channel for the call set¬ up procedure, a power supply part, and a user terminal comprising a hand-set and a dialling device.
2. An arrangement according to claim 1, characterised by a standard (e.g. CCITT) line interface between the sub¬ scriber terminal and the user terminal, the interface sup¬ porting a ringing generator and a two wire copper cable.
3. An arrangement according to claim 1, characterised by a simple two wire connection between the subscriber ter- minal and the user terminal, the user terminal further including a piezoelectric ringer.
4. An arrangement according to claim 1, characterised in that the subscriber terminal and the user terminal are integrated in the same unit .
5. An arrangement according to any one of the preceding claims, characterised in that the power supply part is inte¬ grated in the subscriber terminal.
6. An arrangement according to claim 1, characterised in that the subscriber terminal includes an interface for connecting a number of user terminals, e.g. up to 4, 8, 16, 32 or more.
7. An arrangement according to any one of the preceding claims, characterised by concentration in the radio part for supporting a greater number of user terminals than the number of radio channels.
8. An arrangement according to any one of claims 1 to 5, characterised in that an omnidirectional antenna is con¬ nected directly to the user terminal.
9. An arrangement according to any one of claims 1 to 7, characterised in that a separate antenna is connected to the subscriber terminal, e.g. directly on the subscriber terminal or via lines to a window, wall or roof mounted antenna.
10. An arrangement according to any one of the preceding claims, characterised in that the power supply part is connected to an independent power supply unit com¬ prising a power generator, e.g. solar panels and/or a wind generator, rechargeable batteries, and a control unit for controlling the charging procedure.
11. An arrangement according to any one of the preced¬ ing claims, characterised in that the air interface is capable of supporting 64 kb/s PCM coding offering high quality audio, and/or variable data rates up to 64 kb/s.
12. An arrangement according to claim 11, characterised in that that the air interface is capable of multiplexing several PCM channels offering hi-fi audio, or ISDN basic rate access (BRA) .
13. An arrangement according to any one of claims 1-3, 5-7, and 9-12, characterised in that the RF unit of the radio part is integrated with an antenna, the RF unit being powered from the subscriber terminal by an antenna cable .
PCT/SE1997/000503 1996-04-29 1997-03-24 Subscriber terminal arrangement WO1997041699A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU23139/97A AU2313997A (en) 1996-04-29 1997-03-24 Subscriber terminal arrangement

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9601618A SE9601618D0 (en) 1996-04-29 1996-04-29 Subscriber terminal arrangement
SE9601618-3 1996-04-29

Publications (1)

Publication Number Publication Date
WO1997041699A1 true WO1997041699A1 (en) 1997-11-06

Family

ID=20402374

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1997/000503 WO1997041699A1 (en) 1996-04-29 1997-03-24 Subscriber terminal arrangement

Country Status (3)

Country Link
AU (1) AU2313997A (en)
SE (1) SE9601618D0 (en)
WO (1) WO1997041699A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999051043A1 (en) * 1998-03-29 1999-10-07 Eci Telecom Ltd. Wireless local loop system
WO2000028637A1 (en) * 1998-11-11 2000-05-18 Freeplay Market Development Limited Power source
WO2002041648A2 (en) * 2000-11-15 2002-05-23 Raze Technologies, Inc. Subscriber integrated access device for use in wireless and wireline access systems
US9225555B2 (en) 2000-11-15 2015-12-29 Access Solutions, Ltd. Wireless communication system and device for coupling a base station and mobile stations
US9426794B2 (en) 2000-11-15 2016-08-23 Access Solutions, Ltd. Wireless communication system and device for coupling a base station and mobile stations

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2230162A (en) * 1989-04-03 1990-10-10 Mitsubishi Electric Corp Mobile telephones
EP0583233A2 (en) * 1992-08-13 1994-02-16 Hughes Aircraft Company Radio telephony system using a multisubscriber unit
WO1994019877A1 (en) * 1993-02-16 1994-09-01 Telefonaktiebolaget Lm Ericsson Arrangement for telecommunication
US5444867A (en) * 1991-01-11 1995-08-22 Kabushiki Kaisha Toshiba Adapter unit for adaptively supplying a portable radio telephone with power

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2230162A (en) * 1989-04-03 1990-10-10 Mitsubishi Electric Corp Mobile telephones
US5444867A (en) * 1991-01-11 1995-08-22 Kabushiki Kaisha Toshiba Adapter unit for adaptively supplying a portable radio telephone with power
EP0583233A2 (en) * 1992-08-13 1994-02-16 Hughes Aircraft Company Radio telephony system using a multisubscriber unit
WO1994019877A1 (en) * 1993-02-16 1994-09-01 Telefonaktiebolaget Lm Ericsson Arrangement for telecommunication

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999051043A1 (en) * 1998-03-29 1999-10-07 Eci Telecom Ltd. Wireless local loop system
WO2000028637A1 (en) * 1998-11-11 2000-05-18 Freeplay Market Development Limited Power source
US6472846B1 (en) 1998-11-11 2002-10-29 Freeplay Market Development Limited Power source
WO2002041648A2 (en) * 2000-11-15 2002-05-23 Raze Technologies, Inc. Subscriber integrated access device for use in wireless and wireline access systems
WO2002041648A3 (en) * 2000-11-15 2002-09-19 Raze Technologies Inc Subscriber integrated access device for use in wireless and wireline access systems
US9225555B2 (en) 2000-11-15 2015-12-29 Access Solutions, Ltd. Wireless communication system and device for coupling a base station and mobile stations
US9426794B2 (en) 2000-11-15 2016-08-23 Access Solutions, Ltd. Wireless communication system and device for coupling a base station and mobile stations
US9379916B2 (en) 2001-01-19 2016-06-28 Access Solutions, Ltd. Wireless communication system and device for coupling a base station and mobile stations
US10264562B2 (en) 2001-01-19 2019-04-16 Access Solutions, Ltd. TDD FDD communication interface

Also Published As

Publication number Publication date
AU2313997A (en) 1997-11-19
SE9601618D0 (en) 1996-04-29

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