CN1190831A - Equipment for connecting modem to public telephone line - Google Patents
Equipment for connecting modem to public telephone line Download PDFInfo
- Publication number
- CN1190831A CN1190831A CN97123450A CN97123450A CN1190831A CN 1190831 A CN1190831 A CN 1190831A CN 97123450 A CN97123450 A CN 97123450A CN 97123450 A CN97123450 A CN 97123450A CN 1190831 A CN1190831 A CN 1190831A
- Authority
- CN
- China
- Prior art keywords
- codec
- demodulator
- modulator
- telephone line
- digital signal
- Prior art date
- Legal status (The legal status 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 status listed.)
- Pending
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
- H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Telephonic Communication Services (AREA)
- Communication Control (AREA)
Abstract
The invention provides improved equipment used to connect a modem with a public phone line. The invention comprises a first coder-decoder, which is connected with the modem, and is used to convert the simulating signal output by the modem into the digital signal, transmit the digital signal to the phone line, convert the digital signal output by the phone line into the simulating signal, and transmit the simulating signal to the modem; a plurality of second coder-decoders; a time switch which is interlinked between the first coder-decoder and the second coder-decoder. Each of the second coder-decoders is connected with one corresponding phone line, and is used to convert the simulating signal from the phone line into the digital signal, and transmit the digital signal to the phone line.
Description
The present invention relates to data communication system, more particularly, relate to a kind of through improved in order to modulator-demodulator is connected to the equipment of general telegraph circuit.
Usually modulator-demodulator is interconnected between the communication system so that properly transmit data between communication system, and this null modem extensively is used in the communication system such as computer, cordless telephone machine [for example CT-2 (second generation cordless telephone machine)] etc.
Fig. 1 shows being connected between prior art modulator-demodulator and the general telegraph circuit.As shown in FIG., the I/O end of modem 10 can be connected with some circuits of a plurality of telephone lines by analog switch 14 selectively.Here should be noted that because the analog signal of modulator-demodulator 10 outputs can not directly send telephone line to, thereby analog switch 14 is interconnected between modulator-demodulator 10 and the general telegraph circuit.
Therefore, if divide the telephone line of tasking modulator-demodulator to be out of order, prior art system just may not provide data communication services.Usually, because data fuse tube reason resembles the transmission of the important information of system management messages and charge information and so on, thereby the data communication fault may be brought heavy strike to communication system.In addition, the input/output signal of modulator-demodulator also may be decayed because of the intrinsic resistance of analog switch itself, and this is that we are undesirable.
Therefore, the purpose of this invention is to provide and a kind ofly be used for modulator-demodulator is connected to equipment on the general telegraph circuit through improvement.
Another object of the present invention provides a kind of data communication fault of avoiding in order to modulator-demodulator is connected to the equipment on the general telegraph circuit.
The present invention also has another purpose, and a kind of equipment that prevents the input/output signal decay of modulator-demodulator promptly is provided.
According to one aspect of the present invention, the present invention comprises first codec and second codec with the equipment that modulator-demodulator is connected to general telegraph circuit.First codec connects modulator-demodulator, its effect is that the analog signal conversion with modulator-demodulator output becomes digital signal to send second codec again to, and converts the digital signal of second codec output to analog signal and send first codec again to.Second codec is interconnected between first codec and the telephone line, its effect is to convert the digital signal that first codec is exported to analog signal to send telephone line again to, and the analog signal conversion that telephone line is come becomes digital signal to send first codec again to.
According to another aspect of the present invention, the present invention comprises one first encoder, a plurality of second codec and a clock switch with the equipment that modulator-demodulator is connected to one of them telephone line of a plurality of telephone lines.First encoder connects modulator-demodulator, and its effect is that the analog signal conversion with modulator-demodulator output becomes digital signal to send telephone line again to, and converts the digital signal of telephone line output to analog signal and send modulator-demodulator again to.Each connects corresponding one of them telephone line second encoder, its effect is to become digital signal to send first codec again to the analog signal conversion that road in the telephone wire is come, and converts the digital signal of first codec output to analog signal and send telephone line again to.Clock switch is interconnected between first codec and second codec, and its effect is to send the digital signal that first codec is exported to second codec, and sends the digital signal of one of them second codec output to first codec.
Can more be expressly understood above and other objects of the present invention, characteristics and advantage from the detailed description of one embodiment of the present of invention being done below in conjunction with accompanying drawing.In the accompanying drawing:
Fig. 1 is the wiring block diagram between prior art modulator-demodulator and the pay station line;
Fig. 2 is the wiring block diagram between one embodiment of the present of invention modulator-demodulator and the pay station line.
Describe a most preferred embodiment of the present invention in detail referring to accompanying drawing below.In the accompanying drawing, identical numbering is represented components identical.In addition, should know to be understood that, many details, for example the details of circuit element only illustrates in order to understand the present invention better, does not have these details can implement the present invention too.In addition, be helpless to illustrate that basic principle of the present invention also can the spy add deletion if should also be noted that the detailed description of relevant prior art is thought.The term that uses in this specification is to consider function of the present invention fully and definite, can be replaced according to general practical situation or user or chip designer's intention fully.These terms are preferably determined according to the described content of whole specification.
Fig. 2 shows the situation that is connected between modulator-demodulator of the present invention and the general telegraph circuit, and this is to connect common connection situation in the CT-2 base station of a plurality of telephone lines.
Referring now to Fig. 2.Under collection of letters mode, modulator-demodulator 10 is connected a plurality of telephone line TEL1～TEL3 selectively by first codec 16, clock switch 18 and second to the 4th codec 20～24.When receiving by the first telephone line TEL1, voice signal just converts digital pcm (pulse-code modulation) signal to by second codec 14.The digital pcm signal is added on the particular channel by clock switch 18.This digital pcm signal on the particular channel converts simulation signal RX to by first codec 16.The analog signal RX that first codec 16 produces is added on the modulator-demodulator 10.
On the contrary, under the mode of posting a letter, the analog signal TX that modulator-demodulator 10 produces is added on the clock switch 18 after converting the digital pcm signal to by codec 16.Clock switch 18 sends the digital pcm signal to second to the 4th selected codec 20,22 and one of them codec of 24.Then, selected codec becomes analog signal with the digital pcm conversion of signals of receiving, by connected corresponding phone line the analog signal that converts to is sent out again.
Can know in sum and know,,, also can carry out data communication effectively even break down at indivedual telephone lines if equipment of the present invention is applied to the CT-2 base station that connects a plurality of telephone lines.In addition, equipment of the present invention need not any analog switch on the signal path of modulator-demodulator, thereby has solved the problem of prior art signal attenuation.In addition, can also control arbitrarily and send the gain of the signal of modulator-demodulator to, thereby improve the performance of communication system from first codec.
Describe in detail with regard to a most preferred embodiment of the present invention above, but should know to be understood that all changes of the basic principle of the present invention that the experts in present technique field may instruct this specification and/or revise and still belong to the present invention in spirit described in the appended claims and scope.
Claims (1)
- One kind in data communication system in order to modulator-demodulator is connected to the equipment of one of them telephone line in a plurality of telephone lines, described data communication system has a modulator-demodulator in order to send and to receive analog signal so that carry out data communication by telephone line, described equipment is characterised in that it comprises:First codec, be connected with described modulator-demodulator, become digital signal in order to analog signal conversion, and convert the digital signal of described telephone line output to analog signal and send the analog signal that converts to described modulator-demodulator again the output of described modulator-demodulator;A plurality of second codecs, each connects corresponding one of them telephone line, each described second is compiled demodulator the analog signal conversion that telephone line comes is become digital signal, and the digital signal of will described first codec exporting converts analog signal to and sends the analog signal that converts to telephone line again; WithA clock switch, connect between described first codec and described second codec, send one of them described second codec in order to digital signal, and send the digital signal of one of them described second codec output to described first codec described first codec output.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR70561/96 | 1996-12-23 | ||
| KR1019960070561A KR19980051651A (en) | 1996-12-23 | 1996-12-23 | Connection between modem and public telephone line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1190831A true CN1190831A (en) | 1998-08-19 |
Family
ID=19490390
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97123450A Pending CN1190831A (en) | 1996-12-23 | 1997-12-23 | Equipment for connecting modem to public telephone line |
Country Status (7)
| Country | Link |
|---|---|
| JP (1) | JPH10200648A (en) |
| KR (1) | KR19980051651A (en) |
| CN (1) | CN1190831A (en) |
| DE (1) | DE19754862A1 (en) |
| FR (1) | FR2757728A1 (en) |
| GB (1) | GB2320645B (en) |
| RU (1) | RU2127492C1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1914977A3 (en) * | 2006-10-18 | 2008-05-28 | Samsung Electronics Co., Ltd. | Facsimile Apparatus to Support a Plurality of Lines and Operating Method Thereof |
| US8155284B2 (en) | 2006-10-18 | 2012-04-10 | Samsung Electronics Co., Ltd. | Facsimile apparatus to support a plurality of lines and operating method thereof |
| DE102008053475B4 (en) | 2008-10-28 | 2019-09-05 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Adjustable vehicle seat |
| RU2445744C1 (en) * | 2010-07-07 | 2012-03-20 | Общество С Ограниченной Ответственностью "Владимирский Завод "Электроприбор-1" | Coupling unit of device for coupling double-wire line with vhf radio station |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2766380B2 (en) * | 1990-06-19 | 1998-06-18 | 株式会社東芝 | Modem pooling system |
| DE4315621A1 (en) * | 1993-05-11 | 1994-11-17 | Sel Alcatel Ag | Interface arrangement for connecting base stations to a private branch exchange |
-
1996
- 1996-12-23 KR KR1019960070561A patent/KR19980051651A/en not_active Application Discontinuation
-
1997
- 1997-12-10 DE DE19754862A patent/DE19754862A1/en not_active Withdrawn
- 1997-12-19 GB GB9726967A patent/GB2320645B/en not_active Expired - Fee Related
- 1997-12-22 RU RU97122262A patent/RU2127492C1/en not_active IP Right Cessation
- 1997-12-22 JP JP9352501A patent/JPH10200648A/en active Pending
- 1997-12-22 FR FR9716241A patent/FR2757728A1/en active Pending
- 1997-12-23 CN CN97123450A patent/CN1190831A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE19754862A1 (en) | 1998-06-25 |
| FR2757728A1 (en) | 1998-06-26 |
| GB2320645B (en) | 1999-03-17 |
| GB9726967D0 (en) | 1998-02-18 |
| RU2127492C1 (en) | 1999-03-10 |
| KR19980051651A (en) | 1998-09-25 |
| GB2320645A (en) | 1998-06-24 |
| JPH10200648A (en) | 1998-07-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5033062A (en) | Digital modem | |
| US7206399B2 (en) | Failsafe configuration for alternative network telephony | |
| CN1204716C (en) | Integrated circuit card for computer communication | |
| WO1996029793A3 (en) | Multiple digital signal multiplexer | |
| US6259708B1 (en) | System and method of transmitting voice over digital subscriber line | |
| CN1145346C (en) | Method for processing telephone signals delivered by analog telephone terminal and processing data delivered by data terminal | |
| ITMI961292A1 (en) | PROVISION FOR COUPLING OPTIONAL ADDITIONAL EQUIPMENT TO TERMINALS OF DERIVATIVE SYSTEMS | |
| CN1190831A (en) | Equipment for connecting modem to public telephone line | |
| US6934278B1 (en) | Multimedia interface for a communications network | |
| US4538033A (en) | Data bridge with gating and/or testing | |
| CA2223315A1 (en) | Telephone apparatus, modem device, computer apparatus, and communication terminal device | |
| CN1165467A (en) | Terminal equipment | |
| CN1083296A (en) | Low power emergency telephone mode | |
| US6034992A (en) | High-speed PC modem connection system | |
| EP0786884A3 (en) | Method of transmitting identification signals after connecting an electrical device to a bus line | |
| CN213635364U (en) | Take audio decoding transmission's fill data line soon | |
| KR100285717B1 (en) | Method of directly converting signals in exchange system | |
| CN1271507A (en) | Communication system | |
| US4286119A (en) | Arrangement for concentrating pulse code modulation processing circuits in a digital telephone office | |
| JPS6120458A (en) | Busy tone signal converting circuit | |
| CN2146821Y (en) | Double-set of telephone switching device | |
| Reinhard et al. | Network termination equipment with integrated a/b interfaces for SwissNet | |
| Southwood | The telephone as a local area network | |
| CN113965650A (en) | Digital line remote user connection system, method and remote agent deployment system | |
| CN1601938B (en) | Virtual time slot exchange method and its application circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |