HRP930616A2

HRP930616A2 - Process for telephone data transmission

Info

Publication number: HRP930616A2
Application number: HR930616A
Authority: HR
Inventors: Rolf Baumeister
Original assignee: Deutsche Telephonwerk Kabel
Priority date: 1992-04-04
Filing date: 1993-03-31
Publication date: 1994-10-31
Also published as: EP0564702A2; HU9300794D0; PL298339A1; NO931268L; EP0564702A3; SI9300165A; HUT64167A; CZ368992A3; FI931477A; NO931268D0; FI931477A0; DE4211820C1; SK368992A3

Description

Izum se odnosi na postupak prenošenja podataka po telefonskim vodovima telekomunikacijskih uređaja, osobito kućnih uređaja sa sporednim telefonima, paralelno sa prenošenjem govora uz pomoć noseće frekvencije iznad frekvencije govornog područja. The invention relates to the process of transmitting data over the telephone lines of telecommunication devices, especially home devices with secondary telephones, in parallel with the transmission of speech with the help of a carrier frequency above the frequency of the speaking area.

Za prenošenje podataka pe telefonskim vodovima poznati su različiti postupci. Pri tom se pomoćne skretnice na krajnjim aparatima i u centralnom uređaju telekomunikacijskog uređaja, govorni dijelovi i dijelovi za podatke spajaju odnosno opet razdvajaju. Kao skretnice služe npr. filteri za propust niskih frekvencija, koji propuštaju analogno signale za prenošenje govora, propuštaju i prigušuju digitalne signale više noseće frekvencije (DE-34 22 265 C2). Different procedures are known for transmitting data over telephone lines. At the same time, the auxiliary switchboards on the end devices and in the central device of the telecommunications device, voice parts and data parts are connected or separated again. Low frequency pass filters, which pass analog signals for speech transmission, pass and attenuate digital signals of a higher carrier frequency (DE-34 22 265 C2) serve as crossovers.

Takav postupak zahtijeva na oba kraja generator koji proizvodi noseću frekvenciju potrebnu za prenošenje podataka. Ovo traži dodatni ekonomski utrošak za krajnje uređaje. Such a procedure requires a generator at both ends that produces the carrier frequency needed to transmit data. This requires additional economic expenditure for end devices.

Zadatak izuma bio je da se ukaže na ekonomsku povoljniju mogućnost realizacije noseće frekvencije, koja mora biti prisutna u krajnjim uređajima za navedenu vrstu prijenosa podataka. The task of the invention was to indicate an economically more favorable possibility of realizing the carrier frequency, which must be present in the end devices for the specified type of data transmission.

Zadatak izuma je riješen kao što je prikazano u prvom patentnom zahtjevu, što se za proizvodnju noseće frekvencije primjenjuje samo jedan generator kod čega se nalazi prijenosna frekvencija stalno u telefonskim vodovima i kada se podaci ne šalju, da se prijenosna frekvencija za prenošenje podataka reflektira. Ova refleksija je upravljana preko promjenjivih impedanca koje su selektivno umetnute kao zaključenje telefonskih vodova. The task of the invention is solved as shown in the first patent claim, which is to use only one generator for the production of the carrier frequency, where the transmission frequency is constantly in the telephone lines and when data is not sent, that the transmission frequency for data transmission is reflected. This reflection is controlled via variable impedances that are selectively inserted as the termination of the telephone lines.

Daljnje prednosti su predmet podzahtjeva. Further advantages are subject to sub-claims.

Izum je prikazan na crtežima, koji se sastoji od četiri slike. Pojedine slike prikazuju samo one sastavne elemente, koji su potrebni za prenošenje podataka i to: The invention is shown in the drawings, which consist of four pictures. Individual images show only those components that are necessary for data transmission, namely:

Slika 1 prikazuje uređaj za prijenos i primanje centralnog uređaja telekomunikacijskog postrojenja i jednog krajnjeg uređaja Figure 1 shows a device for transmitting and receiving a central device of a telecommunications facility and one end device

Slika 2 prikazuje rješenje za centralni uređaj prespajanja jednosmjerne vezne mreže govornog kanala Figure 2 shows the solution for the central switching device of the one-way link of the voice channel

Slika 3 prikazuje princip spajanja krajnjeg uređaja za proizvodnju reflektiranog signala noseće frekvencije Figure 3 shows the principle of connecting the end device for producing the reflected signal of the carrier frequency

Slika 4 prikazuje princip spajanja krajnjeg telefonskog uređaja, korištenjem postojećeg viličastog spoja. Figure 4 shows the principle of connecting the end telephone device, using the existing plug connection.

U svim slikama svi sastavni elementi imaju iste referentne oznake. In all figures, all constituent elements have the same reference marks.

U slici 1 centralni uređaj EZ telekomunikacijskog postrojenja ima dvosmjernu frekvencijsku skretnicu FW, preko koje modulirani podaci dospijevaju na telefonski vod LTG, odnosno s kojeg se oduzimaju. Centralni uređaj EZ osim toga sadrži viličast spoj GA za odvajanja uređaja za slanje i primanje signala podataka, na koji se priključuju modulator M i demodulator D. Noseća frekvencija za prenošenje podataka proizvodi se putem samo jednog generatora G za telekomunikacijske uređaje i priključene krajnje uređaje. In Figure 1, the central device EZ of the telecommunications facility has a two-way frequency switch FW, through which the modulated data reaches the telephone line LTG, that is, from which it is subtracted. The central device EZ additionally contains a fork joint GA for separating the devices for sending and receiving data signals, to which the modulator M and the demodulator D are connected. The carrier frequency for data transmission is produced by only one generator G for the telecommunications devices and the connected end devices.

Krajnji uređaj EE, npr. telefonski aparat, sadrži također dvosmjernu frekvencijsku skretnicu FW i jedan demodulator D za primanje podataka. Nadalje postoje kompleksni otpornici ZA, ZB i mehanička ili elektronska sklopka ES za slanje podataka. Podaci se asinhrono u poludupleks postupku prenose u obliku telegrama podataka ili sinhrono pomoću digitalnog modulacijskog postupka. Noseća frekvencija je izabrana tako, da je osiguran dovoljan razmak od govorno frekvencijskog područja. Optimalnom se prikazala frekvencija od 32 KHz. Ova noseća frekvencija leži u stanju mirovanja prenošenja podataka, kad se podaci stalno ne prenose po telefonskim vodovima LTG. The end device EE, for example a telephone set, also contains a two-way frequency crossover FW and a demodulator D for receiving data. Furthermore, there are complex resistors ZA, ZB and a mechanical or electronic switch ES for sending data. Data is transmitted asynchronously in the half-duplex process in the form of data telegrams or synchronously using a digital modulation process. The carrier frequency was chosen in such a way that a sufficient distance from the speech frequency range was ensured. The optimal frequency was 32 KHz. This carrier frequency lies in the idle state of data transmission, when data is not continuously transmitted over the LTG telephone lines.

Za vrijeme prenošenja podataka od centralnog uređaja EZ do krajnjeg uređaja EE, noseća se frekvencija u skladu sa logičkim stanjem priključka Tx1 na modulatoru M uključuje i isključuje. Ovo stanje prepoznaje demodulator D krajnjeg uređaja EE, te preko svog priključka Rx2 signalizira to stanje. Kod toga telefonski vod LTG mora biti selektivno zatvoren za noseću frekvenciju sa valnim otporom ZW = ZA + ZB tj. sklopka ES krajnjeg uređaja EE mora biti otvorena. During data transmission from the central device EZ to the end device EE, the carrier frequency is turned on and off according to the logic state of the Tx1 port on the modulator M. This state is recognized by the demodulator D of the end device EE, and signals this state via its Rx2 port. In this case, the telephone line LTG must be selectively closed for the carrier frequency with wave resistance ZW = ZA + ZB, i.e. the switch ES of the end device EE must be open.

Za slanje podataka od krajnjeg uređaja EE do centralnog uređaja EZ, koji se mora nalaziti u stanju mirovanja, karakteriziran je nosećom frekvencijom koja je na telefonskom vodu LTG. U skladu s logičkim stanjem Tx2 sklopka ES krajnjeg uređaja EE otvara se ili zatvara. Kad je sklopka ES zatvorena, telefonski vod LTG nije više sa valnim otpornikom ZW zatvoren za noseću frekvenciju, već samo još sa impedancom ZA, buduući da je impedanca ZB kratko spojena. U ovom stanju dio noseće frekvencije u krajnjem uređaju EE reflektira se kao signal. Reflektirani signal dospijeva preko viličastog spoja GA na demodulator D centralnog uređaja EZ, koji ga vodi dalje preko izlaza Rx1 na obradu. U posebnom slučaju, ako je impedanca ZA = 0, a impedanca ZB odgovara valnom otporu ZW, reflektira se cijela noseća frekvencija, budući da kod zatvorene sklopke ES postoji kratki spoj na kraju voda. U suprotnom slučaju, kada je ZA = ZW i ZB = 0, ne dolazi do frekvencije, budući da impedanca ZA odgovara valnom otporu. To send data from the end device EE to the central device EZ, which must be in idle state, it is characterized by a carrier frequency that is on the telephone line LTG. According to the logic state Tx2, the switch ES of the end device EE opens or closes. When the switch ES is closed, the telephone line LTG is no longer closed with the wave resistor ZW to the carrier frequency, but only with the impedance ZA, since the impedance ZB is short-circuited. In this state, part of the carrier frequency in the end device EE is reflected as a signal. The reflected signal arrives via the fork connection GA to the demodulator D of the central device EZ, which takes it further via the Rx1 output for processing. In a special case, if the impedance ZA = 0, and the impedance ZB corresponds to the wave resistance ZW, the entire carrier frequency is reflected, since there is a short circuit at the end of the lines when the switch ES is closed. In the opposite case, when ZA = ZW and ZB = 0, no frequency occurs, since the impedance ZA corresponds to the wave resistance.

Prikazani postupak za prenošenje podataka može se realizirati na razne načine: Dvosmjerne frekvencijske skretnice FW i viličasti spoj GA moraju biti stvoreni na uobičajni način pomoću prenosnika, induktiviteta i kapaciteta. Kao viličasti spoj GA može se upotrijebiti i elektronski sklop. The presented procedure for transferring data can be realized in various ways: The two-way frequency converters FW and the fork connection GA must be created in the usual way using transformers, inductances and capacitances. An electronic circuit can also be used as a GA fork joint.

Kod krajnjeg uređaja EE postoji mogućnost da se impedanca ZA + ZB odnosno samo ZA simulira pomoću jednog upravljanog elektronskog sklopa preko ulaza za slanje podataka Tx2. With the end device EE, it is possible to simulate the impedance ZA + ZB, or only ZA, by means of a controlled electronic circuit via the input for sending data Tx2.

Korištenjem postupka za prenošenje podataka u telekomunikacijskom uređaju sa spojenom mrežom za četverožične trajne - direktne veze, kod čega su krajnji uređaji sa postrojenjem spojeni sistemski telefoni, nudi se rješenje prema slici 2. Ovdje upotrebljeni sastavni elementi SLIC za odvajanje smjerova, služi za priključivanje analognih krajnjih uređaja na digitalne sisteme, obuhvaća između ostalog dvožične i četverožično pretvaranje, koje se također koristi za prenošenje podataka. Niskopropusni filter TP u vodu za prijem govora sprečava zatvaranje noseće frekvencije na spojenu mrežu, a pojasni propusti BP zaslanjaju demodulator D i modulator M prema govornom frekvencijskom području. By using the procedure for transmitting data in a telecommunications device with a connected network for four-wire permanent - direct connections, where the end devices are system telephones connected to the plant, a solution is offered according to Figure 2. devices to digital systems, includes, among other things, two-wire and four-wire conversion, which is also used for data transmission. The low-pass filter TP in the line for speech reception prevents the closing of the carrier frequency to the connected network, and the bandpasses BP screen the demodulator D and modulator M towards the speech frequency range.

Alternativa proizvodnji reflektirajućeg signala noseće frekvencije je ta, kao što je prikazano na slici 3, da se ulaz na četverožičnoj strani viličastog spoja GA krajnjeg uređaja EE, poveže sa svojim izlazoz preko sklopke ES. Na taj se način ovisno o logičkom stanju priključka Tx2 reflektira signal noseće frekvencije. An alternative to the production of the reflecting signal of the carrier frequency is that, as shown in Figure 3, the input on the four-wire side of the fork connection GA of the end device EE is connected to its output via the switch ES. In this way, depending on the logic state of the Tx2 port, the signal of the carrier frequency is reflected.

Na slici 4 prikazan je ovaj princip za krajnji telefonski uređaj. Koristi se i viličasti sklopa Gk. Frekvencijska skretnica FW (slika 3) zamijenjena je pri tom niskopropusnim filterom TP i pojasnim propustima BP. Pojasni propusti BP i niskopropusni filter TP drže spajanjem noseće frekvencije nastale niskofrekventne komponente signala izvan područja govorne frekvencije. Nadalje sprečavaju pogrešno prilagođavanje u niskofrekventnom području putem prenošenja podataka. Figure 4 shows this principle for the end telephone device. It is also used fork assembly Gk. The frequency crossover FW (Figure 3) was replaced by a low-pass filter TP and bandpasses BP. Bandpasses BP and low-pass filter TP keep the low-frequency components of the signal created by combining the carrier frequency out of the speech frequency range. Furthermore, they prevent misalignment in the low-frequency range through data transmission.

Claims

1. A procedure for transmitting data over the telephone lines of telecommunications devices, especially by means of auxiliary telephone facilities, in parallel with the transmission of speech with a carrier frequency above the frequency of the speaking area, indicated by the fact that only one generator (G) is used to create the carrier frequency, whereby the carrier frequency constantly lies in the telephone lines (LTG) even when no data is being transmitted, which reflection is controlled by variable impedances (ZA, ZB) which are selectively used as termination of the telephone lines (LTG) against the carrier frequency.

2. The procedure according to claim 1, characterized by the fact that the applicable impedances (ZA, ZB) are simulated by electronically controlled circuits.

3. The method according to claim 1 and 2, characterized in that the impedances (ZA, ZB) are part of the end device (EE).

4. The method according to claim 1, indicated by the fact that the reflections are produced by means of a switch (ES), which in the case of a fork circuit (GA) connects the input of the four-wire side with its output.

5. The method according to claim 4, characterized by the fact that a fork circuit (GA) is used for separating speech signals and data signals of a built-in unit (SLIC) for connecting analog end devices to digital systems.

6. The method according to claim 1-4, indicated by the fact that the signals of the reflected carrier frequency are fed to the demodulator via the fork circuit (GA) and the built-in unit (SLIC).

7. The method according to claim 1, characterized by the fact that the generator (G) for producing the carrier frequency is part of the central device (EE) of the telecommunications device.