DE1791151A1 - Multi-channel transmission system - Google Patents

Description

SIEMEIiS 'SHARES & ESEIISCHAFI

Munich 2 _} ²³ ' ^SER1968 liittolsbachGrplatz2

^PA 68/2902

Multi-channel transmission system

The invention relates to a method of transmission of speech information and for the production and resolution of the individual speech path used switching 'indicators in a multiplex system, in particular a time division multiplex system, which preferably works with pulse code modulation.

Schk / Ath

- 2 -

109851/0386

ΡΛ 9/432/101 - 2 -

In switching technology, v / ic in Pig »'' is based on one example outlines the network structure in such a way that a larger number of subscribers are relatively close together "are adjacent, if necessary via a subscriber agency TVSt to a local traffic tunnel OVSt are switched on, to which end exchanges EVSt are assigned = several such local exchanges are connected to a network-wise higher-level Knotonvermittlungsstollc KVSt = the one of the OVSt and, if applicable, the EVSt recorded power supply is generally referred to as the local network. The KVSt The network covered by the network is generally referred to as the district network. Several such node switching tunnels can be connected to each other and have additional connection paths to other local or district networks. In the present case, the so-called "long-distance network level" is not taken into account Establish a telephone connection to any other subscriber in the telephone network can »Such telephone connections not only require the transmission of voice information but also to Boginn, during and after the end of the connection also the transmission of switching indicators that correspond to the Building, maintaining and dissolving each Connections are used = within the local network and district network level in common Pßrnsprechsystotnen these criteria are usually transmitted via the speech and / or control cores using appropriate symbols.

Multi-channel systems can be switched on on the connection sections of the individual local and node exchanges been-. As a result, a larger one is grounded on a line system using frequency or time division multiplexing methods

1098S1 / 0386

ΡΛ 9/432/101 _3-

Number of parallel transmission paths created in these Kehrkanalübortragungssystemen must also separate Communication channels for those assigned to the individual speech channel Switching indicator provided v / earth ο For frequency mid-tipping systems this is done by separate signal frequencies that are either within the speech signal band or, as is common today, mostly within the actual Voice channel, but transmitted outside of the voice signal band will. In the case of multiplex systems with pulse code modulation work, either one bit per code word for such signaling and also for synchronization purposes dos pulse system or it becomes a closed one Code word with all its bits for all code words dos pulse frame provided together for these purposes., In order to obtain a sufficiently large number of identification channels in such a time division multiplex system or the To make a sufficient number of bits available for signaling purposes is made up of several successive ones Pulse frame is a higher-level framework for signaling and the synchronization tasks that arise in such systems

In a system of this type that works with time-division multiplexing, the problem also arises that the time delay or newspaper error occurring for the individual character during transmission should be kept as small as possible, for example less than 1 millisecond o By combining several pulse frames into a higher-level one has been signaling pulse frame, however, compliance with this requirement very difficult, especially if one takes into account vrelche large number of pieces of information or "switch identifier in the Xennzeichenkanälen transmitted. For speech channels in the local "or district network

• - 4 ~ 109851/0388

BAD ORlGJNAL

PA 9/432/101 - 4 -

level with the simultaneous possibility of handling long-distance connections, the number of switching criteria is so large that up to now three identification channels per speech channel in one direction of transmission have been viewed as the lowest limit. It should be noted that, with a telephone connection, although in the direction from the calling party to the called number which can be small to be transmitted criteria, but in the opposite direction is then considerably higher "In a speech channel is in each FSS .the connection in a direction of an Speaking group between the. 'Understand participants »

The invention is based on the object of showing a possibility for reliable switching identification transmission while at the same time reducing the mentioned number of identifier channels per speech channel. Really important is the invention for systems in which the switching indicator transmission takes place via speech and control pins, with which, therefore, a larger number of switching indicators is present.

^ In the case of a method for transmitting speech information " and for the production and resolution of the individual speech path in a multiplex system, in particular time division multiplex system, preferably with pulse code modulation works, this object is achieved according to the invention in that for each speech channel in the multiplex system zvici mutually independent communication channels are provided, and in the one identification channel the impulse identification numbers representing switching identification numbers and im The switching indicators representing the status indicators are transmitted to another indicator channel.

- 5 -! 09851/0386 _{BAD ORIS1NAL}

PA 9/432/101 - 5 -

Bach has been a development of the invention, in the status indicators such Irapulskennzoichen are displayed, which the respective status identifier for immediate Have requirement. ". ■,

So there are the switching connections to be transmitted divided into two groups, namely into status indicators and in Irapulslcennzoicheno to be sub-status flags in systems such as those used by the Germans Bundespost are introduced in the direction of the calling subscriber to the called, the occupation and the dissolution were in charge and in the direction from the called subscriber to the calling party, the receipt, the reporting, the rear Blocking and, if necessary, catching the connection ,, Under Impulse indicators are in the direction of the calling subscriber to the called subscriber dialing and possibly = that Fernkennzoichen understood while in the reverse direction of transmission the dialing sign, the busy signal, the beginning sign, the number sign and the end sign Impulse indicators are »

Through this subdivision and the separate transmission of Status and impulse indicators make it possible to to transmit a relatively large number of switching indicators, because the impulse indicator is always a Diuerkennzcichen of a certain kind and impulse indicators, apart from a few exceptions, each other are always subordinate in time.

It is particularly advantageous in a time division multiplex system that operates with pulse code modulation, the individual speech channels of which are combined in a pulse frame which is periodically repeated and in which the switching indicators are either assigned in the individual codo words

,. ._. 109851/0386 _BA0 or \ ginau

PA 9/432/101 - 6 -

Signal or SynchronMt (advantageous synchronization and Signaling) odor in a dor speech channel (bundled Synchronization and signaling) if η speech channels (Codowörtcrn) with τη bit 2 · η / τη '' Pulsrahrcon for signaling and synchronization to be summarized »

The inventive method is of particular advantage when used in a pulse code modulation system on telecommunication lines, especially for local and / or district ■ traffic

An advantageous device for performing dos according to the invention The method is characterized in that a series parallelura sucker is used to evaluate the switching indicators is provided, the at least two, preferably three immediately successive bit dos superordinate Pulse frame feeds a Ausworteschaltung which controls the license plate converter. Here it is still advantageous if between the Ausworteschaltung and the output of the Konnzeichen converter for pulse identifiers the are additionally transmitted in the indicator channel for status indicator, auxiliary circuits are provided which the Bridge the interruption of the status indicator for the duration of the pulse indicator »

The invention is described below with the aid of exemplary embodiments explained in more detail

The exemplary embodiments relate to a pulse code modulation system, taking into account that PuIscodcmodulationssysteme both on Punkstreckon and line transmissionGWogon, especially on symmetrical ones lines with the appropriate equipment. '' Removal of the Pupinization, installation of pulse amplifiers) provided wbrclGn can. For a technical and economic

109851/0386

BATH ORIGINAL

ΡΛ 9/432 / 1Oi - 7 -

Local connection lines are particularly suitable for use in the local network OvI and in the Bezirksnotz the Endamtsloitungen El and the quorum connection lines Ql (Fig. 1). A common structure of a telephone network is, for example, in dcni "Taschenbuch der Fernmcldepraxis", 1968, p. 214, shown and "described.

The formation of the Kennzeichenkanälo in a PCM system can carried out as follows v / earthworks In Figv 2 is a sequence of Codewb'rtern, for example, each consist of 8 bits, shown m namely schematically pro for a PCM system with 32 Codcwörtorn pulse frames "It also systems with other Bitsahl per code word and other code word count per Pulsrahrcen are common Z _0, 7-bit Systerae and 24 PCM channels" Each of the code words represents a separate transmission Icanal. Any such transmission channel repeats in the individual pulse frame at the same point in time, based on the transmission time of a pulse frame. The transmission channels 1 to 30 are intended for the transmission of voice information, for example. The 31 "transmission channel in the pulse frame is used for synchronization of the bundled Zeitniultiplexsystems and the 32nd transmission channel is used for signal transmission, so the formation of characteristics canals% for transferring Schaltkennzoichen. Since the individual code word consists of eight bits and two signal channels are to be formed per transmission channel, a total of 32 - 2 bits = 64 bits must be made available the formation of the 64 identification channels a higher-level signal pulse frame SPR can be formed from 8 pulse frames PR, which is repeated periodically. This is schematically indicated in FIG. 2, in which Ht denotes the pulse frame comprising 32 transmission channels and SPR denotes the higher-level signal pulse frame. At the for the

109 851/0386

BATH ORIGINAL

PA 9/432/101. - 8th

TRANSMISSION CANUlG OF THIS TYPE OF CONDITIONAL DEFROSTING FREQUENCY. of 8 kHz is the duration of a pulse frame. 125 micro. Seconds. And thus the time interval between the individual bits (ill ^ GdOTt) individual identification channel 1 millisecond ₀ Of the 64 bits of the signal pulse frame SPR, namely the GX ¹ StG bit forms the identification channel -1, the second bit the identification channel 2, etc. ₀ up to the 64 »bit, which forms the ¹ channel 64 identifier. tledoE KonnEGichei-jkanal liat zv / oi Zu.-stH.ndCj nahwiieh the Irap ul saust and Ö and doti ttnpülssustand Ito BGispiGlsv / ßisG i / ordon doiö transmission channel 1 (ontsprGGhend dem Godouart 1 2 assigned, transmission channel 2 receives the identification channels 5 and 4 usvfo Since the connection must correspond to a four-wire connection in the local and in the district, a PGM transmission channel is used for the connection from the calling toilet to the called subscriber (= a voice channel) and in rücliviärtiger Eichtüttg from the called participant ztixa calling participant (= a Spreöhkana ^ -) required. In order to be able to better distinguish the four identification channels required for the connection between two subscribers in the following description, each identification channel Sk is assigned a direction of transmission reference in addition to the channel number designation by the indices' v = forwards and r = backwards) and zv; ar means ν the transmission direction from the calling zütö called: subscriber, while r means the return direction.

i) The switching indicators triggered by the participant are via the Loitungsadorn des ToilnGhmeränschlussos überettiiittülte PotentiälG bsv /. Potentiai change. This v / erdün in an exchange of switching organs' 2.B ₉ voters) recorded and in the form of impulse and ZuötändskGnnaeiohen

10Μ61 / Θ3Μ

BATH ORIGINAL

ΡΛ 9/432/101 _g_

so-called "Kennzeiehenumetzorn. The Kennzoiehen-UTiisetzer are differentiated within a line section according to the transmission direction (g = going; Ic == coming) en .. In the transmission / by means of pulse code modulation or in a time division multiplex system, the individual circuit symbols occur in a series code and are converted into a parallel code via a code converter, for example by means of a delay chain or a delay line in a manner known per se = If at least two, preferably three consecutive bits are evaluated from the bit sequence of the individual Konnseichenkanal, then two or the switching state 10 or 101 (i.e., "h", an imp Pulse train with half the pulse train frequency, based on the pulse train 11 '(Hi), which is therefore not easily distinguishable from the case of Oil (01C)). In the pig. 3 this series-parallel conversion with the Auswortc circuit AWS is shown schematically _o The three bits evaluated in this example correspond to three immediately successive bits in a code channel. By evaluating three bits, a high level of error security is achieved with a low number of inaccuracies per code channel. On the delay line, three successive bits are taken in parallel from tap a, which are in electrical intervals corresponding to the time interval between bits, for the evaluation. The respective possible pulse states are indicated in a row on the output lines, namely in the top row the pulse states 000, in the next line the pulse states 111, in the following line the pulse states 101 and below that the

- 10 -

109851/0388

OBlGtNAL

PA 9/432/101 - 10 -

Impulse states 010. As can be seen from this, 101 and 010 differ in the case of a long-lasting identifier only in that there is a phase shift of 180, v / o through a distinction "in itself, but not possible with simple means" The Ausworteschaltung AWS is designed in such a way that an output pulse only appears at output 1 if the pulse train 000 is present at the input in the parallel code a signal always appears at the output 3 when applied to the input _of% AWS either pulse train 101 or 010th This immediately allows .A conversion of serial code in certain switch identifiers.

A code converter connects to the evaluation circuit KZU at. Such a KZU is provided for each speech channel, each of which can have its own AWS.

It is important that, in relation to the individual transmission direction, pure pulse codes are transmitted in one code channel and pure status codes in the other code channel. This is explained in more detail with reference to the following drawings. It should be noted that because of the mutual independence of the identification channels _{, combinations of identification transmission on the two associated identification channels are also possible;}

The basic drawing plan is shown by Pig »4 on lines of the district network and Fig = 5 on lines of the local network “ Depending on the direction of transmission, there is a systematic division of characters between the two identification channels Skiν and Sk2v or »SkIr and ._S.k, 2r _; . As a .Kr.iteriuw.der ready for occupancy creates a connection path, a permanent sign is displayed in the direction of view

- 11 109851/0386

BATH

ΡΛ 9/432/101 ■ - 11 -

transmitted via Bk2r. If the duration sign falls on Sk2r because of a fault, e.g. spinning failure at the V / LLer or a line interruption off, then an occupancy is prevented on the outgoing side (rearward blocking) Occupancy is transmitted a permanent character via Sk2v; permanent character Sk2r is switched off as confirmation of occupancy. If this confirmation of occupancy does not come in, then the relevant outgoing KonnzGichenunisetzer after triggering . automatically locked. At the same time a so-called Test assignment sent out after the! End of the disturbance, dJu lifted the block after the confirmation of the booking was opened And the outgoing KZU automatically .froischaltct. These Functions are assigned to the KZU-g * dor if not available A signal is sent to the corresponding malfunction in response to the presence of the vehicle celdcoin directions. This case is in a The diagram in FIG. 6 is picked out as an example.

■,. 'Ählittpulso v; earth transmitted via Skiv. In the district network all backward characters, end of dialing, busy, Transfer beginning and end of flicker to SkIr “In FIG. 7 is the case corresponding to FIG. 6 in the endorsal concept KoLmend (El-k) shown. IKZ 50 or IKZ 5Ov means Switching indicator according to Dom Plan 50 or »5Ov of Deutschon Federal Post Office ο

Itii local network, on the other hand, will use the message as a permanent signal V / icdoro switch on Sk2r transfer., Flicker closing sign and catch are returned in Skir. Included a distinction must be made between the following cases.

1, lines with local traffic

Leads to the I, G-ruppenwählorstufo, if the FornausBchöiäungsziffor O is not set,

~ 12 -

101811/0306

BATH

9/432 / 101- - 12 local traffic only. The following characters are to be transmitted:

Occupy the final sign

Choose 'Catch

Start sign (Moldon) release

Fig. 8 shows the functional sequence for local traffic and receipts as a permanent sign via Sk2r, select as an impulse sign via Skiv. The initial sign Moldon (- an b-Adcr) is used as a permanent sign transferred by switching Sk2r on again. The negative potential is only evaluated in the KZU-O-k if the c-ador is grounded (bolling state) «through the Double use of Sk2r (monitoring and reporting) becomes 9t1rfrci for the VicitorgaTDC of the final sign and capture (+ to a-Ador) «When catching v; ird + to the a-Ador with removal from - to the "b-core SkIr switched on and Sk2r switched off O

2. Lines with local and long-distance traffic

Lines to z "B" Ortsgruppenv / ähler OG-V / - or II »Gruppenv; ahlstufon IIGli carry both local traffic and the so-called arriving long-distance traffic. In addition to the characters mentioned under point 1, the following characters must be transmitted;

Remote codes busy tone

End-of-choice character start character

9 shows the functional sequence for local and long-distance traffic recorded. A distinction must be made between the following cases.

- 13 -

109861 / 0388- 'original bathroom

PA 9/432/101 - 13 -

2a »FornvorrohrsiformG setting

The distinguishing feature for a remote setting is the offering of the Fornkonnzcichons (- to b-Ader) from the preceding transmission section or from the KZU-Ic "This symbol is included in the KZU-OF-g intended for local and long-distance traffic, in Sk2v transmitted by an interruption of the permanent character and potentially given in the KZU-OIMc wc it or given »In the KZU-OF-k, the assignment of the c-ador is bridged for the duration of the transmission of the remote connection character. This can be done "with an auxiliary circuit, which is to be inserted between the Auswortoschaltung and the output of the identifier converter '3 ¹ Xg.3.

2bo Local traffic setting

With the local setting, the characters are like exchanged under point 1 »

In addition to the switching indicator classification discussed above, there is also a classification, for example in the area of Common to the German Federal Post Office, which differs in that it reports the called one when it catches a connection Participant does not require, but a catch by a special? angvor pulse, which occurs before the Report lies, initiates »

This type of switching indicator with an additional catch pre-pulse can also beberrsehen in 'development of the invention with only two indicator channels, as below 10, 11 and 12 are shown.

109851/0388

ΡΛ 9/432/101 -H-

In Fig. 10, the switching flags are on the PCM lines on the one hand for local traffic and on the other hand for incoming long-distance traffic on the local connection lines shown. The outgoing long-distance traffic is analogous to the illustration according to FIG. 5 and therefore does not require any further details Explanation. As the comparison of FIG. 10 with FIG. 5 shows with regard to local traffic, differentiate The two types of traffic are only affected by the catch pre-impulse, which, if necessary, occurs before the start sign in SkIr can come, the actual catching and reporting (or /. the beginning character) and the other characters remain the same »Das usual and therefore not go.'jomlort ilargo nt hurried busy signal, neither in FIG. 5 nor in FIG. 10 for local traffic can be seen in Sk2r zv / i, if available the occupancy receipt and the reporting. Further "(Changes are not required in local traffic

A particular redesign is, however, with regard to the Switching indicators on the PCM lines for incoming Carry out long-distance traffic, as the second diagram of FIG. 10 shows. The identification channels Skiν and Sk2v are initially same to the corresponding representation in Fig. 5 “All in Sk1r in the operating mode according to FIG However, v / are no longer grounded in SkIr but in Sk2r together with the switching identifiers already present there transfer. This frees up SkIr for the eventuality to be transmitted catch pre-impulse and for the actual catch.

In local traffic or when using the simplified switching indicator IKZ 5Ov, the Boginn sign is also transmitted in SkIr. This criterion is then used for the weitero Processing of this connection to correct the potential relationships at the output of the corresponding license plate setter, by applying it to the Uropoling of the potential

- 15 1098S1 / 0386

BATH ORIGINAL.

ΡΛ 9/432/101 - 15 -

the b-wire on the outgoing side is used for the connection » However, this only applies to settlement in local traffic and in the case of simplified switching connection symbols IKZ 5Ov.

In Fig. 11, the corresponding representation is still for the Transition from the three connecting wires of the license plate converter KZU-g or KZU-Ic to the license plate channels of the PCM lines reproduced, from which the detailed handling should be recognizable without further explanation.

Regarding the structure for the KZU This further development of the invention means that it has to do with the criterion of the occurrence of the start character on both license plate channels with a corresponding evaluation circuit are to be provided, and that also a Polarity changer is to be provided in the b-wire of the KZU-g, which is controlled by the associated evaluator.

Through training according to the Pig. 10 to 12 v / earth is reached, that an IPCH connection along with its flag converters both for the IKZ 50 and IKZ-50v switching indicators as well as for local traffic and when used various Pang processes can be used universally »

In the pig. 12 is also shown in the form of a circuit diagram, like the Kennzeiehenumctzer for this training accordingly are to be added. Both in the license plate converter KZU-g as well as the license plate converter KZU-k each becomes an evaluator AVJ-g or AiMc also provided. In the b-vein of the KZü-g a polarity changer PVi is inserted, which is controlled by the evaluator AVf ~ g is controlled directly.

With the normal impulse identification IKZ 50 becomes positive Potential at the input of the b-wire of the KZU-k as a switching code only transmitted in license plate channel Sk2r.

PA 9/432/101 - 16 -

In the case of a simplified switching indicator IKZ 50v "or pure local traffic, the Atiswerter and the Potentialv / echsler come into action, because only negative potential can be applied to the b-wire. With negative potential at the connection for the b-wire of KZU-k and simultaneous) The positive potential at the connection for the a-wire from KZU-k is transferred to SkIr and Sk2r, the switching state 1 »This is caused by the evaluator AW-k in KZU-ko.This is caused by this transferred criterion _{Sl; 1r; and Sk2r in KZU-g} the evaluator AW-g assigned there that the m potential changer PVi inserted into the output of the b-core applies negative potential to the b-core. It should be noted that the positive potential at the connection for the a-core of KZU- k is still transferred to KZU-g in SkTr and passed there to the a-core *

The polarity changer PV remains in the switched state until the connection is disconnected and only then becomes its Restored to original condition.

Ira local traffic can happen that at the connection for the pail the a-wire of KZU-k no positive potential is present when negative potential is present at the b-wire connection. In this case P, the evaluator AW-k is to be designed in such a way that it is already at Negative potential at the connection for the b-wire brings the license plate channels SkIr and Sk2r to the switching state L.

In the previous exemplary embodiments, the individual switching criteria were each assigned in a specific manner Impulse states 0 and L indicated. The pulse states can of course be swapped by replacing the of the pulse state L is the pulse state 0 and the pulse state 0 is replaced by the pulse state I.

10 claims

12 figures - 17 -

109851/0386

ORIGINAL

Claims (1)

PA 9/432/101, - 17 - Patent claims 1, ancestors for the transmission of voice information and for the production and triggering of the individual speech path used switching code in a multiplex system, in particular time division multiplex system, which preferably works with pulse code modulation ₅ characterized in that two independent code signal channels are provided for each speech channel in the multiplex system, and in the one identification channel transmits the switching indicators representing the pulse indicators and in the other indicator channel the switching indicators representing the status indicators v / earth » 2 «Method according to claim 1, characterized in that such impulse indicators are displayed in the status indicators that correspond to the respective status indicator have to be an immediate requirement. 3. The method according to claim 1 or 2, in one with pulse code modulation working time division multiplex system whose individual speech channels are combined in a pulse frame are, which repeats itself periodically and in which the Switch indicators either in the individual code words assigned signal or ·. Synchronization bits (distributed synchronization and signaling) or in one of the speech channels (bundled synchronization and signaling) are transmitted, characterized in that with η speech channels (code words) with m bits 2 · n / m pulse frames can be combined into a higher-level pulse frame for signaling and synchronization » - 18 109851 / 038S. · PA 9/432/101 - 18 - 4. Ancestors according to claim 1, characterized by its Blinding on a pulse code modulation system Telephone lines, especially for local and / or district traffic. 5. Facility for carrying out a procedure according to ■ Claim 3, characterized in that for evaluation the switching indicator. Series parallel converter provided is, the at least zv / ei, preferably three immediately consecutive bits of the higher-order ρ pulse frame e, iner Ausv / erteschaltung which the License plate converter controls. 6. Device according to claim 5, characterized in that zv / ischen Ausvrorteschaltung and output of the license plate converter for pulse indicators that are also transmitted in the indicator channel for status indicators v / earth, auxiliary circuits are provided that the Interruption of the status indicator for the duration bridge the pulse indicator. 7. The method according to any one of claims 1 to 4, characterized in that that 'switching identifiers, which at the same time ™ transmitted v / ground in both license plate channels, serve as a control criterion for the license plate urasotzer in the direction of transmission of these switching codes « 8. The method according to claim 7, characterized in that the Stouerkriterion for UwHtOUOrUnβ, dor 2olnrii ;; i, i; dor Signals on at least one of the to the code converter connected signal wires. - 19 - 103851/0386 BAD ORiGiNAL PA 9/432/101 - 19 - 9. The method according to one) of claims 1 to ^, 7 and 8, characterized in that in a switching indicator with FangvoriHuls the one-one switching indicator on the indicator channels in the rearward direction (Sk1r, Sk2r) divided so that in one indicator channel only the possibly existing Pangvorira pulses and the start character and in the other identification channel the other switching characters and additionally the start character are transmitted at the same time » 10. Device for performing a method according to claim 7 or 8, characterized in that in the each of the two identifiers (KZU-g, KZU-k) provided at the ends of the PGM path, one evaluator (AVZ-g, AV / -k) is provided, of which the one for the rear Identifier channels active evaluators (AW-g) when they occur of a given identifier, such as negative potential on the b-wire in both identifier channels (Sldr, Sk2r) the reverse direction causes the same switching state, preferably the switching state!) wheel of those of the evaluators provided in the other license plate converter (Atf-g.) At least one polarity changer, preferably controls in the b-wire in such a way that when the same switching state occurs in both identification channels (SkIr and Sk2r) the potential at the relevant control wire or the output line of the license plate converter (KZU-g) reversed. 109851/0388 Blank page