DE10112462A1 - Shared line telephone system for small exchanges has switch network to spare line increases capacity - Google Patents

Abstract

The shared line telephone system has two way switch buttons (2TA) to change any handset to a shared spare line (8).

Description

The invention relates to a method and an expanded Supplementary circuit and a second dialing system for Connect 2 phones to one phone line with their own call number, including a call is possible under the 2 phones.

Small + medium-sized dialing systems are only for a certain one Number of telephone connections designed. Do you want to Connection of a telephone to the last telephone connection connect another phone, so a larger dialer must be bought.

Often it would be enough if on some telephone connections 2 phones would be connected - especially if the conversation volume is not that big.

There are already options for 2 telephones on one tele to connect the telephone connection using a Automatic changeover switch (AWADO) - See the patents: DE 36 33 561 / DE 40 36 405 u. a. - IPC: H04M 1/72, but with (on) call are not distinguished and exactly d. wrong participants can pick up the handset.

Large dialing systems have bottlenecks Community connections - see IPC: H04M 13/00. At Smaller dialing systems are not intended. The patent DE 44 35 034 shows a solution that also is possible with smaller dialing systems.

However, you will get two phone numbers / Telephone lines required!  

The published patent application DE 199 40 801 shows a solution how to get the one you want with different numbers Can dial subscribers, although both phones only on connected to a telephone line! However, there are two problems:

There can be no connection between the 2 phones be set up and if a telephone seizes the line the second phone is "dead".

The object of this invention is an extended one Complementary circuit to create where also a connection between the two phones, or that from one 2. Telephone can also be used to set up a telephone call, if the (shared) telephone line from the 1st telephone already is occupied.

For the sake of clarity, the additional patent application is divided into 2 main parts [in terms of the task, solution, structure and several sample descriptions], even if they are completely different, it is better to register in one application [- rather than several applications!], Because they can also be combined:

• 1. A dialer with advanced supplements circuit,
• 2. A second dialer - to the first dialer.

At the end there are further ideas as further developments.

1st task

A dialer with advanced additions circuit.

1. Solution

Every telephone would have to have a second connection path (a common one for everyone), via which a connection can be established within the dialing system - both to any subscriber
[if the 1 participant has already seized the telephone line with the automatic changeover switch (AWADO) with his telephone] or
to the other subscriber / telephone that is connected to the same automatic changeover switch (AWADO).

This can be produced by a "2nd line key" (2nd LT) of a simple in-line system, whereby a single, reserved telephone line / number is connected to the "trunk line of the in-line system", which goes to each telephone (looped) and to d . individual "internal connection line connections (s)" the output of the automatic changeover switch (AWADO) is connected. In order to avoid such a high expenditure of lines, the "in-line system" is relay-controlled, so that only one control line from the telephone has to go to the extended supplementary circuit (ERWS) and all the wiring is done within it. A circuit of a series system see patent specification / layout specification in the DPK: 21 a ³ 13/10: key-operated series systems:
DT 1 006 014 only Fig. 1
DT 1 219 536 only the AT button in the illustration [rest unintensive!]
DT 1 182 305 only the office keys [rest unintensive!]
DT 1 062 753 Overall function of a row system [but confusing in the representation!] And others!

But since all functions of a row system are not required the first two fonts mentioned are already testifying.

The contact set of the public keys (AT) of all participants / Telephone sets are simply connected in series [hence the name: row system].

But since a whole number of cable wires are required, the idea of the office key came early on to be replaced by relay contacts, so that only the relay must be controlled: DT 871 774 or DT 1 190 055. However, there are still several contacts from the button used to control the corresponding relay must be operated!

However, since not all functions of a row system are required - it is sufficient if only one button is used a [Shift] contact, here 2nd line key (2nd LT) called, controls the relay with the make contact spring.  

The relay - called the 2nd line relay (2LR) - is held by switching the relay coil with a hold contact (2lr ^V ) to a hold and busy line with the connection (hbl).

Since there should not be a disconnect button for reasons of line economy, the end of the call is confirmed by a relay (B) with two - Magnetically and electrically the same for reasons of symmetry suitable - [low-resistance] relay coils, whereby one each in the a-wire and one in the b-wire - at the beginning of the one, single, common telephone line (II. Line) - is switched.

A capacitor is connected in parallel to the relay coils (C1) or (C2) switched, via which the alternating current should flow.

Via a third, high-resistance relay coil of the relay (B) see later.

1. Construction

In addition to the structure described in the solution, the following:

The pick-up relay (B) has a sequence changeover contact (b ^I ) whose common, middle contact spring is connected to positive (+) and to the inner normally closed contact spring there is a connection (ak ') to which a control chain with all 2nd line buttons (2nd LT ) - connected in series - connected. The hold-and-busy line with the connection (hbl) to which the hold contacts (2lr ^V ) of all / every 2nd line relay (2LR) are connected is located on the working medium contact spring
[NB: an external normally closed contact spring of the sequence switching contact (b ^I ) remains unoccupied.].

On the hold-and-busy line with the connection (hbl) in each separate control box (BK) [- for the telephones / subscribers] a [busy] document lamp (BL) is connected,
which is installed in the 2nd line key (2nd LT).

Connect two further working contacts (2lr ^{III + IV} ) of the 2nd line relay (2LR) [somewhat delayed, after the subsequent changeover contacts (2lr ^{I + II} ) - so that they cannot establish a connection to the 2nd line via them!] Each associated, own telephone line with a common call line (GRL) to which a common call relay (GRR) is connected via / with a call capacitor (C3).

With two working contacts (grr ^{I + II} ) of the common call relay (GRR) an alternating voltage is placed on a further, third, high-resistance relay coil of the document relay (B) [so that a ripple voltage (in the rhythm of calls) is superimposed on the common telephone line becomes - for signaling a call on your own telephone line].

The supplementary circuit of the published patent application DE 199 40 801, which is also identified here with (EGS), is needed for 2 participants each and will be between the dialing system and the expansion circuit (ERWS) switched.

The further development there W5.):
"Deactivating the wrong call"
[Switching off the 2nd telephone when the 1st subscriber calls with a (r1 ^III ) contact and
Switching off the 1st telephone when the 2nd subscriber calls with an (r2 ^III ) contact]
is to be used!

The common control line 2 (G2) also comes from it, where the 2nd subscriber control indicator lamp (2TA) in each separate control box (BK) [connected to the phones / participants].

The power supply is shared for the supplement circuit (EGS) and the expansion circuit (ERWS) used and has a corresponding performance. It also has an AC output for that Assignment relay (B), as ripple voltage.  

2nd task A two-phone system - to the first phone system, (preferably a radio dialing system) 2. Solution / structure

A solution shows d. Font: DE 36 10 730 IPC: H04M 3/42 registered on March 29, 1986, however with in addition to many good ideas (!) several for the user unfavorable techniques should not be adopted!

First of all [1. Point] is the use of a direction key figure (RKZ) to be used for [Technically cheap] selection from the second dialing system to First dialing system [also called private branch exchange] selected must be [in case of inquiry and with an internal connection] see claims 3 + 7!

There is another way - namely the other way around:

When dialing a number within the second dialing system a direction code - 2nd system (RKZ2) is selected and when dialing all other numbers without the direction code number - 2nd system (RKZ2) becomes a connection to the first dialer location built.

The numbers of the second-dialing system consist of two parts: the "hidden" direction code - 2nd system (RKZ2) and a continuous [at least one-digit] run the number - corresponding to d. Participants / participants close!

One does not become with this procedure with one Memory flip-flop get along, as with the font mentioned DE 36 10 730 but requires more storage space.

However, there have long been systems with storage locations that save connection states for later operations, e.g. B. the layout specification DT 1 562 233 from 7.3.1968 with d. DPK on the cover page 21a ³ 8/00 (presumably a misprint) and correctly in the drawing 21a ³ 38/00; ao!

Another point is that in the document DE 36 10 730 no direct dial to the desired one from the primary dialing system Subscriber to the second dialer is possible, but one Mediation apparatus / process is necessary.

If you consider that probably as a second-dialing system practically predominantly a radio dialing system comes to the Eisatz - one can assume that 4 or 6 participants / Handsets can already be considered sufficient!

In the case of known dialing systems [without direct dialing], the exchange line laid on a particular telephone at night [With small dialing systems there is no special one anyway Conciliation apparatus, but the mediation takes place from an ordinary telephone!] - so you could make a (quasi) extension!

If one uses the method according to DE 199 40 801, then you only need 2 or 3 connecting lines + phone numbers the first dialing system and can be controlled by a relay double this to 4 or 6 numbers!

May be required for 2 or 3 exchange lines / exchange rates, which are always assigned to 2 phone numbers [once with u. once without d. Relay control code].

The automatic changeover switch (AWADO), as in the Supplementary circuit (EGS) [see also laid-open specification DE 199 40 801] are in the primary dialing system, are even omitted, since the trunk lines / exchange rates anyway can switch through to each participant, e.g. B. at Transfer on inquiry / transfer of the call [and outgoing]. But going out is (preferably) always (first) d. assigned trunk / trunk set seized. As a supplement to each handset in the display additional display, namely the 2nd participant control [- as with corded telephones of the First dialing system, the 2nd subscriber control lamp (2TA)].

The published patent application DE 42 07 775, IPC: H04M 1/72, shows a radio dialing system, but where only an outside call is possible
[In the case of the document EP 03 04 998 A2 column 1 from line 23 mentioned there, however, several conversations can be held simultaneously! / etc.].

The bit overview given there, see FIG. 2, will be similar for all radio dialing systems. It is described in column 3 from lines 02-16: 3 bits are used to identify each individual handset [of 7 handsets]. In column 5 from line 30 a collective call is described with the identifier. Column 3 line 13 expressly says that an adaptation to a larger number of handsets is easily possible. One or two / more bits are then used for the identification.

Another bit can thus also be inserted, namely a second subscriber control bit (2TAB) [- in FIG. 3 also “single-digit” with: (a) designated! - A "1" applies to the 2nd subscriber, a "" for not activated and always with the radio direction: handset → system!], which is generated by a make contact (by ^II ) of the changeover relay (UM) of the second dialing system becomes. This bit is evaluated in the handset and converted into a symbol, or by "2. TA", in the display / in d. The handset is displayed so that every user can recognize an initiated 2nd subscriber control.

Thanks to the special dialing process in the primary dialing system: First activate the relay with a code, listener again hang up and then the technical number of the telephone company dialing - is the complete number: once single-digit and then for the second participant [if necessary] even three digits!

It is not worth the three-digit number as Pass on bit identifier [bit wasted!] - especially since it there are only 4 or 6 handsets, but the individual call assign numbers to a 3-bit combination and this too store in the [already mentioned] memory (SP) so that when dialing within the second dialer to the dialed phone number of the desired subscriber / connection or the desired handset is reached.  

N. B .: When dialing within the second dialing system can [Deviating from the choice: from the first dialing system to one second participant of the second dialing system] a second participant without the handset in between to hang up, must be selected [ie the complete Call number can be dialed in one piece!]!

The same also applies to the choice of the first dialing system, the code: "(7) 2" for controlling the changeover relay (UM) during the selection evaluation is converted into the control of the second relay contact (zr ^I ) of the second relay (ZR) and only the subsequent digit z. For example: "3" or "4" issued / passed on to the primary dialer.

The relay contact of the first dialing system (R contact) and the second relay contact (zr ^I ) of the second dialing system and the changeover relay (UM) are activated so that the control for the second subscriber works in both directions and with / in both dialing systems. both dialers connected in parallel with a bridge.

In addition, when dialing within the second dialing system, the second relay (ZR) with its second relay contact (zr ^I ) is never activated [deviation!]!

The 3 bits for controlling the individual handsets can be divided into a continuous part and a single, last bit (z)
which is formed, among other things, by the [actuated] contact (r2 ^I ) of the call 2 relay (R2) of the supplementary circuit (EGS) or by the selection evaluation circuit (WAS).

The consecutive part starts with "1" for the lowest Number pair "5" or "(7) 25"; "1" for the next one Number pair "6" or "(7/26"; "11" for the next one Pair of numbers "9" or "(7/29".

This is followed by the only last bit (z):
a "" for the first subscriber [with the single-digit number], or a "1" for the second subscriber [with the multi-digit number].

Together, it is only 3 bits.  

A different 3-bit combination "1" can be used for one individual participants z. E.g .: "8" should be set if e.g. B. the II. Line with the number "8" from the first Dialer is also looped to the second dialer and on your own trunk / own rate II (A. II) rests [with the associated hold-and-occupied Line at the connection (hbl) - to prevent occupancy if a participant on the first dialer has this line (2nd line) has already occupied!].

When a participant in the second dialing system is selected, the election evaluation takes place in the election evaluation circuit (WAS). This uses the already mentioned memory (SP) for election evaluation, in which all operating states are stored: connection within the second-dialing system, internal call to the first-dialing system [with details of d. trunk used / trunk set] - to a first subscriber or to a second subscriber with the activation of the second relay (ZR) [with d. Second relay contact (zr ^I )], exchange call via the primary dialing system [with details of d. trunk / exchange rate set used] and initiated query: within the second dialing system or within [within] the first dialing system.

In a further memory area of the memory (SP) all phone numbers are stored and the associated subscriber location or the bit identifier - starting with the phone numbers of the second subscriber in the second dialing system, then the second subscriber in the first dialing system and here with the indication of the activation of the second relay (ZR) [with the second relay contact (zr ^I )],
then that of the first participants in the second dialing system. If the dialed number is not there, a message is displayed that this is a first subscriber in the primary dialing system.

There is a wide connection for connections to the primary dialing system Note which trunk / trunk set should preferably be used.  

When the connection arrives, the "dialing" is based on d. busy trunk / trunk set and the distinction between first or second subscriber by the / a changeover contact (r2 ^I ) of the call-2 relay (R2) to d. assigned supplementary circuit (EGS) [see also laid-open document DE 199 40 801, however no subscriber lamp 1 (TL1) or subscriber lamp 2 (TL2) is required, so that the 1st relay contact can be used differently! The local call relay (RR) of the common technical telephone line is also omitted, the function is performed by a contact of the call relay (AN) d. Trunk / Trunk Set]. If the changeover contact (r2 ^I ) of the call 2 relay (R2) is actuated - then d. incoming call not on the first, but on d. second subscriber / subscriber location / handset switched / placed.

The power supply for the part of the supplementary circuit (EGS) in the second dialing system can be done by a separate Power supply unit, or from the power supply unit of the supplementary circuit (EGS) on the first dialing system or from the power supply of "remaining" second dialing system. With the last named variant, however, are pluggable bridges and a own fuse used, so that in the event of a short circuit the supplementary circuit (EGS) does not include the entire circuit Second dialer fails!  The examples of the invention now follow from the Drawings and tables.

The drawings show the following:

Fig. 1 Extended supplementary circuit (block diagram)

Fig. 1a short explanation of a symbol: from Fig. 1 + 4

Fig. 2 assignment relay (B) including all poles, with single-pole continuation, since the continuation is also single-pole; technically, the assignment relay is located between the dialing system and the 2nd line relay (2LR) of the first subscriber

Fig. 2a control lines with control box (BK) for one phone / one subscriber

Fig. 3 Structure of the identifier (bit string) for the second-dialing system according to Fig. 4

Fig. 4 Second dialing system (with radio), which is connected to a first dialing system with extended supplementary circuit - in part!

The tables have the following content:

Table 1

Connection types with a second dialing system in the numbered columns 3 + 6 + 7 are the states of the components and the rest are clues.

Table 1a

• 1. A.) from the II. To the I. dialing system
• 2. B.) within the I. dialing system
• 3. C.) within the II. Dialing system

Table 1b

• 1. D.) from I. to II. Dialing system and explanations for Table 1.

Table 2

The memory area for the phone number in the memory (SP) of the second dialing system [for an exact specification of the bits was waived].

Table 3

Explanation of the reference numerals used in the drawings etc.
1.G.) Basics:
The participants have to be instructed in the procedure and the telephone directory has to be marked accordingly.
The numbers of the 2nd subscriber all begin with "(7) 2" - the code for relay control [It was adopted from DE 199 40 801; if it has to be two digits, it is "72" - that is, the brackets are simply indispensable, if it is one-digit, it is preferably a "2" - that is, the brackets with the seven (7) are simply to be imagined!
1.I.) A subscriber wants to dial the second subscriber of his [own] technical telephone line z. For example: Participant "3" wants participant "(7) 23". , ., used drawings Fig. 1-2a, the most important drawing is Fig. 1:

Participant "3" picks up his handset and looks at the 2nd line key (2nd LT) of his control box (BK) [der is next to his phone] in which the corresponding one [Busy-] slip lamp (BL) is installed. This lights up not on, that is, the one, only, common phone Line (II. line) is free!

Then he presses the 2nd line key (2nd LT) of his operator junction box (BK) and its 2nd line relay (2LR) picks up:

Fig. 2: Plus potential (+) the sequence changeover contact (b ^I ) of the relay (B), via its common, middle contact spring, the inner normally closed contact spring, the connection (ak ') to which the control chain [of the control lines - Fig . 2a] is connected in series with all 2nd line keys (2nd LT), the connection (ak ') of the control box (BK), the make contact of the operated 2nd line key (2nd LT), the connection (2LR), the Relay coil of its 2nd line relay (2LR) and the minus potential (-).

The relay picks up and actuates its contacts.  

The two working contacts (2lr ^{III + IV} ) of the 2nd line relay (2LR) connect [somewhat delayed] their own telephone line to the common call line (GRL), to which the common call relay (GRR) is connected via / with a call capacitor (C3) [- Section 1.II.)]. The subsequent changeover contacts (2lr ^{I + II} ) [which are actuated first] switch over and disconnect the telephone from its own telephone line and switch it to the one, single, common telephone line (II. Line). It is assumed that the dialing system can still establish a call and that it therefore sends the dial tone to the phone. In addition, the pick-up relay (B) picks up because it lies in the a / b line and is flowed through by the telephone loop current [ FIG. 2]. Its follow-up changeover contact (b ^I ) is actuated and the plus potential (+) now reaches the connection (hbl) via the follow-up changeover contact (b ^I ) via its common middle contact spring, the working medium contact spring. From the connection (hbl) it goes [ Fig. 2a] over the control line to the holding contact (2lr ^V ) and then to the relay coil of the 2nd line relay (2LR) and to the negative potential (-).

The relay remains energized and will not drop out if the sequence changeover contact (b ^I ) is moved because it switches over without interruption!

From the connection (hbl) it also goes to the [busy] document lamp (BL), which is installed in the 2nd line key (2nd LT) of the control box (BK) [ Fig. 2a] and at the same time at the minus potential (-) lies. It lights up.

From the connection (hbl) it also goes via the control line to all other [busy] occupancy lamps (BL) in all control boxes (BK) [see: Fig. 2a several times + Fig. 1], so that they all light up.

Now the code "(7) 2" is selected for the relay control of the dialing system [part of the number of the 2nd subscriber!]. The changeover relay (UM) is activated and thus a plus potential (+) is reached via the common control line 2 (G2) [- see DE 199 40 801 - ≘] - d. Supplementary circuit (EGS) - [ Fig. 1] and from there via the control line [ Fig. 2a], connection (2TA), to all 2nd subscriber control lamps (2TA) in all control boxes (BK), which are simultaneously at the minus potential (- ) lie so that they all light up. He will know that the second participant can now be selected. Now the 2nd line key (2nd LT) is pressed again and the handset is hung up / the handset fork is operated [toggle] so that the connection to the relay selection is terminated [see DE 199 40 801]. The assignment relay (B) drops out briefly, but since the 2nd line button (2nd LT) is pressed, the 2nd line relay (2LR) remains energized [circuit - see when you press the first button], and all [Busy- ] Slip lamps (BL). If the telephone loop is closed again [handset lifted / handset fork released again], the assignment relay (B) in the telephone line (2nd line) picks up again and all [busy] assignment lamps (BL) light up again and the 2nd Line relay (2LR) holds itself again - as it did the first time.

After lighting again d. [Busy-] document lamp (BL), the "remaining" call number "(.). 3" can be dialed and the connection to the subscriber "(7) 23" via the still free technical telephone line "3" and via the automati the changeover switch (AWADO) [- see DE 199 40 801] and the non-actuated subsequent changeover contacts (2lr ^{I + II} ) of the non-actuated 2nd line relay (2LR) of the subscriber "(7) 23" to his telephone [ Fig. 1 + Fig. 1a].
1.II.) A participant, [e.g. E.g .: "3"] wants to establish a telephone connection, but the other subscriber [e.g. For example: "(7) 23"] of his [own] technical telephone line has already been used:
used drawings Fig. 1-2a, especially Fig. 1:

The participant, e.g. For example: "3", picks up his handset and hears no dial tone [- because the other participant, e.g. B .: "(7) 23", the technical telephone line has occupied and the Automatic changeover switch (AWADO) the phone line switched to the other party.

Now he looks at the 2nd line key (2nd LT) of his operator box (next to his phone) in the the associated [busy] receipt lamp (BL) is installed.

This does not light up, which means:
the common telephone line (2nd line) is free!

Now he can - according to section: 1.I.) - a telephone connection build with the only exception, namely not to the other participant [e.g. Eg: "(7) 23"] of the technical Telephone line!

It does not matter whether it is a second participant or a first participant is.

Another process can occur:

The other participant, e.g. E.g .: "(7) 23", the technical The telephone line ends his telephone call and the technical telephone line with automatic changeover switch (AWADO) becomes free.

Then there is a call for the participant, e.g. Eg: "3" one over the common telephone line (2nd line) Has a telephone connection.  

This call is not lost, but goes [see: Fig. 1a] from your own telephone line via the two work contacts (2lr ^{III + IV} ) of the operated 2nd line relay (2LR) to the common call line (GRL) on which the common call relay (GRR) - via / with a ringing capacitor (C3) - is connected [ Fig. 2]. The common call relay (GRR) picks up in the ringing rhythm and, with its two contacts (grr ^{I + II} ) - in the ringing rhythm - applies an alternating voltage to the third, high-resistance coil of the relay (B) with the connections ( 5 + 6 ). The AC voltage is now superimposed on the common telephone line (II. Line) with the help of the other coils of the help relay (B).

Based on the humming tone, the participant recognizes, for. For example: "3" that there is a call on his own telephone line. Now he can end the existing telephone call on the common telephone line (2nd line) by hanging up the phone and, after the relay contacts have dropped out, receives the call directly on his phone and can answer it.
1.III.) Two participants, [e.g. E.g .: "3" + "4"] want to set up a telephone connection simultaneously via the one, single, common telephone line (II. Line), used drawings Fig. 1-2a, especially Fig. 2a:

Both simultaneously press the 2nd line key (2nd LT) on the Control box (BK) pulls the 2nd line relay (2LR) of the participant "3" [see at the beginning of section: 1.I.)].

Since all 2nd line keys (2nd LT) are connected in series to the control chain [the control line {en} - Fig. 2a several times + Fig. 1], it says:
at the first connection (ak ') [ Fig. 2 + then Fig. 2a several times!] the connection (ak') with the 2nd line key (2nd LT) of the subscriber "3" is connected and the contact is at its resting contact (ak "), to which the connection (ak ') with the 2nd line key (2nd LT) of the subscriber" (7) 23 "is connected and to the rest of the contact spring lies the connection (ak"), to which is the Connection (ak ') with the 2nd line key (2nd LT) of the subscriber "4" connected and at the rest of the contact spring lies the connection (ak "), to which the connection (ak') with the 2nd line key (2nd . LT) of the participant "(7) 24" connected and at its rest con tact spring is the connection (ak ") to which. , , etc.!

However, since the 2nd line key (2nd LT) of subscriber "3" is actuated, the incoming plus potential at the connection (ak ') reaches the connection (2LR) and via the make contact of the actuated 2nd line key (2nd LT) thus to the relay coil of the 2nd line relay (2LR); there is therefore no plus potential at its normally closed contact spring and thus at the connection (ak "), which is passed on via the control chain [the control line {en} - Fig. 2a several times + Fig. 1 + 1a]. A 2nd line relay (2LR) of another participant, for example: "4", cannot attract, so only the first participant is successful!

Examples now follow with a second dialing system with reference to FIG. 4 [with FIG. 1a as a symbol explanation], the upper part having already been described in the sections: 1.I.) to 1.III.) And is therefore omitted here .

Only important information for understanding the functions of the second dialing system is mentioned! Furthermore:
FIGS. 3 [Construction of identifier (bit sequence) in the Funkwählanlage] and
Table 2 [memory area for the phone numbers] and
Table 1a + 1b [which together show the 4 connection types with a second dialing system],
the sections also have the same letters as the sections in Table 1a + 1b!

2.A.1.

A participant of the second-dialing system, e.g. E.g .: "5" or "(7) 25" selects a first participant of the primary dialing system, e.g. For example: "1" or "3" or "4" to:

The participant of the second-dialing system, e.g. E.g .: "5" or "(7) 25" selects a first participant of the primary dialing system, e.g. E.g .: "3", the voting evaluation circuit (WAS) evaluates the dialed number using the Storage area for the phone numbers in the memory (SP).

Since the dialed number does not exist, a connection to the primary dialer is established and the election information "3" passed on to this.

Using the identifier (bit sequence) of the handset [or the subscriber location of a corded telephone], e.g. B. the subscriber-specific identifier:
"1" for the participant "5" or
"11" for the participant "(7) 25", whereby the third-to-last and penultimate digit is decisive - if still free - d. Exchange line / exchange rate A.1 [≘ A.1] may be used.

2.A.2.

A participant of the second-dialing system, e.g. E.g .: "5" or "(7) 25" selects a second participant of the primary dialing system, e.g. E.g .: "(7) 23" or "(7) 24" to:

The participant of the second-dialing system, e.g. E.g .: "5" or "(7) 25" selects a second participant of the primary dialing system, e.g. For example: "(7) 23", the voting evaluation circuit evaluates (WHAT) the dialed number using the Storage area for the phone numbers in the memory (SP).

Since the dialed number does not exist, a connection to the primary dialing system is established. However, the dialing evaluation circuit (WAS) recognizes on the basis of the dialed code "(7) 2" for relay control, which is part of the call number, that a second subscriber has been dialed
[The listener did not have to be hung up briefly in between because the election evaluation circuit (WAS) manages the acquisition of the dialing information in one dialing process - to the advantage of the dialing subscriber!] And controls the second relay (ZR).

With its actuated second relay contact (zr ^I ), which is connected to the plus potential (+) of the supplementary circuit (EGS) of the primary dialing system (!), The plus potential passes through the bridge [the supplementary circuit (EGS) of the Second dialing system with the supplementary circuit (EGS) of the first dialing system connects and both changeover relays (UM) and the relay contact (R contact) of the first dialing system and the second relay contact (zr ^I ) of the second relay (ZR) the second -Switch dialer in parallel!],
the connection (R) to the changeover relay (UM) of the first dialing system [which is at the minus potential (-)] and controls this. This means that a second subscriber can now be dialed into the first dialing system!
[see process according to DE 199 40 801].

Now the election evaluation circuit (WAS) gives the "remaining" Election information "(.). 3" [ie without the chosen code "(7) 2" for relay control] to the primary dialing system further; further see section 2.A.1.) [e.g. For example: the identifier (bit sequence) of the handset and d. trunk line / rate used].

NB: The second relay contact (zr ^I ) of the second relay (ZR) of the second dialing system also controls the changeover relay (UM) of the second dialing system, so that with its second working contact (by ^II ) the radio part is signaled is that in the subscriber-specific identifier the 2nd subscriber control bit (2TAB)
[- in Fig. 3 also "single-digit" with: (a) labeled! -] should be set, that is, it should be a "1" [is activated for the 2nd subscriber].

This bit is evaluated in the handset and in a symbol, or by "2TA", in the display of the handset, so that each user has one initiated 2nd subscriber control can recognize. However, this is the connection just described [- sart] unimportant.

2 B.

A participant in the primary dialing system selects a participant within the primary dialer to:

This voting process is described in the sections:
1.I.) to 1.III. described, see there!

If a subscriber of the first dialing system dials a second subscriber within / at the first dialing system, the relay contact (R contact) of the first dialing system is activated there
[see process according to DE 199 40 801].

With its actuated relay contact (R contact), which is connected to the plus potential (+) of the supplementary circuit (EGS) of the primary dialing system, the plus potential also reaches the connection (R), the bridge [which the supplementary circuit ( EGS) of the first dialing system with the supplementary circuit (EGS) of the second dialing system and connects both changeover relays (UM) and the relay contact (R contact) of the first dialing system and the second relay contact (zr ^I ) of the second relay (ZR ) of the second dialing system in parallel!], to the changeover relay (UM) of the second dialing system
[which is connected to the minus potential (-) of the supplementary circuit (EGS) of the primary dialing system (!)]
and controls this.

With the 2nd make contact (around ^II ) of the changeover relay (UM) of the second dialing system, the radio part is signaled that the 2nd subscriber control bit (2TAB) is in the subscriber-specific identifier.
[- in Fig. 3 also "single-digit" with: (a) labeled! -]
should be set, so it should be a "1"
[is controlled for 2nd participant].

This bit is evaluated in the handset and in a symbol, or by "2TA", in the display of the handset, so that each user has one initiated 2nd subscriber control can recognize.

2.C.

A subscriber of the second dialing system dials a subscriber within the second dialer to:

This voting process is a well-known process and will therefore not described in detail.

The electoral evaluation circuit (WAS) evaluates the selected one Call number from the memory area for the phone numbers in the memory (SP).  

Since the dialed number exists, the connection within the second dialing system according to the entry in the number part of the memory (SP) built up.

If "5" is selected, it is a connection with the subscriber position "1" [Table 2], or to the handset with the subscriber-specific identifier "1" [ Fig. 3].

If "6" is selected, it is a connection with the subscriber position "1" [Table 2], or to the handset with the subscriber-specific identifier "1" [ Fig. 3], etc.

If "(7) 25" is selected, it is a connection with the subscriber position "11" [Table 2], or to the handset with the subscriber-specific identifier "11" [ Fig. 3], that is:

If the code number "(7) 2" is also selected for the relay control, the last bit (z) [ FIG. 3] "changes" from a "" to a "1".

In addition, when selecting a second subscriber within the second dialing system, the second relay (ZR) with its second relay contact (zr ^I ) is never controlled (!) Because this is not necessary.

Thus, a first can be made within / at the first dialing system Participants can be selected!

There is an indication in the display / in the display of the handset also not necessary because you can choose in one process!  

2.D.1.

A participant in the primary dialing system dials a first one Participants in the second dialer, e.g. E.g .: "5" or "6" [see procedure and supplementary circuit (EGS) according to / see: DE 199 40 801]:

If a participant in the first dialing system dials a first one Participants, e.g. For example: "5" on the second dialer, so he dials completely normal the technical telephone line "5" and arrives thus to the second dialing system, to the 1st exchange rate (A.1).

There the call is answered by a call relay (AN) here in addition to understanding the supplementary circuit (EGS) - see DE 199 40 801 - called call relay (RR)!

Now the call - as with conventional systems in night position - to an assigned to the trunk / trunk rate Participants forwarded.

Since the changeover relay (UM) of the second dialing system is not actuated, the supplementary circuit (EGS) d. Trunk line / trunk set does not actuate the call-2 relay (R2) and thus its changeover contact (r2 ^I ) is not actuated, but in the idle position!

The call thus arrives at the first subscriber "5", whereby everything else is already known from conventional systems.

The subscriber location is "1" [Table 2], or the subscriber-specific identifier "1" [ Fig. 3] goes to the handset, which means:
for the first subscriber a "" is sent as the last bit (z) [ Fig. 3]!

If you choose participant "6", everything happens in figuratively, only that allowed for the technical phone Line "6" and the 2nd official sentence (A.2) is occupied.  

2.D.2.

A subscriber of the first dialing system dials a second subscriber of the second dialing system,
e.g. E.g .: "(7) 25" or "(7) 26"
[see procedure and supplementary circuit (EGS) according to / see: DE 199 40 801]:

If a subscriber of the first dialing system dials a second subscriber of the second dialing system, he must first dial the code "(7) 2" for relay control, which is part of the number. This controls the relay contact (R contact) of the primary dialing system. , , and the 2nd subscriber control lamp (2TA) lights up
[see procedure / process - according to DE 199 40 801].

With the actuated relay contact (R contact), which is connected to the plus potential (+) of the supplementary circuit (EGS) of the primary dialing system, the plus potential also reaches the connection (R), the bridge
[which connects the supplementary circuit (EGS) of the first dialing system with the supplementary circuit (EGS) of the second dialing system and both changeover relays (UM) and the relay contact (R contact) of the first dialing system and the second relay contact (zr ^I ) of the Second relay (ZR) of the second dialing system connected in parallel!],
to the changeover relay (UM) of the second dialing system
[which is connected to the minus potential (-) of the supplementary circuit (EGS) of the primary dialing system (!)]
and controls this.

With the 2nd make contact (around ^II ) of the changeover relay (UM) of the second dialing system, the radio part is signaled that the 2nd subscriber control bit (2TAB) is in the subscriber-specific identifier.
[- in Fig. 3 also "single-digit" with: (a) labeled! -] should be set, that is, it should be a "1" [is activated for the 2nd subscriber].

This bit is evaluated in the handset and in  a symbol, or by "2TA", in the display of the handset, so that each user has one initiated 2nd subscriber control can recognize.

Now the dialing participant becomes the first dialer dialed the "remaining" number: "(.). 5" and thus the technical telephone line "5" over which the Call to the second dialer arrives at the 1st exchange rate (A.1). There the call is answered by a call relay (AN) here in addition to understanding the supplementary circuit (EGS) - see DE 199 40 801 - called call relay (RR)!

Now the call - as with conventional systems in night position - to an assigned to the trunk / trunk rate Participants forwarded.

Since the changeover relay (UM) of the second dialing system is activated, the call / relay (R2) is also activated in the supplementary circuit (EGS) of the exchange line / exchange set and thus its changeover contact (r2 ^I ) is activated!

This means that the call does not reach the first subscriber "5", but to the second participant "(7) 25".

The subscriber location is "11" [Table 2], or the subscriber-specific identifier "11" [ Fig. 3] goes to the handset, which means:

If the code "(7) 2" is selected for relay control - for the second subscriber, the last bit (z) [ FIG. 3] "changes" from "" to "1". If the 2nd subscriber control is still activated, the 2nd subscriber control bit (2TAB) is set - the first bit (z) of the subscriber-specific identifier is not a "" but a "1" [ FIG. 3].

Everything else is already from conventional systems known, so it will not be used.

When you vote for the participant "(7) 26" everything happens in figuratively, only that allowed for the technical phone Line "6" and the 2nd official sentence (A.2) is occupied.  

2.D.3. + S.

A subscriber of the first dialing system dials a special subscriber of the second dialing system, namely "8" [see FIG. 4 - also above!]; the one, single, common telephone line (II. line) is additionally routed to the second dialing system after the expansion circuit (ERWS) [see the dashed line: - - - - - - - - -] which is there on an outside line / an outside line ( A.II) without supplementary circuit:

A participant of the primary dialing system chooses the special one Participant "8" on the second dialer, so he dials the technical telephone line "8" and arrives quite normally thus over the one, single, common telephone line (II. Line) - the expansion circuit (ERWS) - for Second-dialing system, for the second official sentence (A.II).

There the call is accepted by a call relay (AN) and - as with conventional systems in night position - to one assigned to the trunk line / trunk rate (A.II) Participant forwarded to participant "8".

A switch: first or second participant finds not instead.

The number of participants is "1" [Table 2], or the subscriber-specific identifier goes to the handset "1"!

This is also the case when dialing within the second dialing system Identifier so - according to the entry in the number part of the Memory (SP) [Table 2], where the phone number at / after the Numbers of the first subscribers are available.

Outgoing can only the trunk line / the official rate (A.II) be occupied when on the hold-and-busy line there is no busy signal with the connection (hbl)!  

If the trunk line / II. Trunk set (A.II) has been seized or received, then the seizure relay (B) is activated in the one, common telephone line (II. Line) because the loop current flows through it [see Fig . 2].

This means that all [busy] receipt lamps (BL) are already on described way [see there] so that all participants on the primary dialer know that they are the only one Cannot seize common telephone line (2nd line) and may.

Further development W1.

The connection with the published patent application DE 197 36 827 is conceivable / sensible, because then the one there Call station (RS) and other [structural] in the control box (BK).

W2.

It would make sense to have all the control lines over one To let the data bus run.

Then the number of cable cores required is of Extended supplementary circuit (ERWS) for the control box (BK) low and uniform.

W3.

With the help of an additional button that can be labeled The handset of the second dialer can control the Changeover relay (UM) of the primary dialing system with control of the secondary system relay (Z-R) directly by the 2. Subscriber control bit (2TAB) also from the handset to Radio part of the second dialing system is sent.  

W4.

A major development is the use of two smaller primary dialing systems with [at least] one Trunk line, but without cross-connection lines - each equipped according to the 1st solution.

Here you can / will:
the one, only [reserved] common telephone line (II. line) - the one primary dialing system - [continued] as one
only, further [reserved] common telephone line (3rd line)
for each subscriber of the other primary dialing system - with the help of a 3rd line key (3rd LT) - made available;
this also happens in the opposite direction.

Each participant has a 3rd line key (3rd LT) with a contact in the / separate control box (BK)
[in which is also the 2nd subscriber control lamp (2TA) and possibly the 2nd line key (2nd LT) {- with the connected 2nd line relay (2LR) -}], d. on in the expansion circuit (ERWS)
[- the one behind the supplementary circuit (EGS)
≘DE 199 40 801 is connected -]
associated 3rd line relay (3LR) is connected;
whose contacts [e.g. E.g .: Sequence changeover contacts (3lr ^{I + II} )] are switched like the contacts of the 2nd line relay (2LR), only on
the one, only [reserved for the procedure] common telephone line (III. line) and between the own telephone line / behind the supplementary circuit (EGS) and
in front of the subsequent changeover contacts (2lr ^{I + II} ) of the 2nd line relay (2LR), or [if not available] the telephone!

When choosing the code for relay control [z. E.g .: "(7) 2"] is not only the changeover relay (UM) with the help of the relay contact (R contact)

• - your own first dialing system,
• - but also that of the other primary dialing system,
• - So the switching relay (UM) of both primary dialing systems controls so that a Selection of a second participant of the other first dialing plant is possible.

This is achieved by [{almost literally} as in claim 18 with the second dialer]
the changeover relays (UM) of both primary dialing systems and
the relay contacts (R contact) of both primary dialing systems [as with the normally open contact (zr ^I ) of the secondary system relay (ZR) of the second dialing system] are connected in parallel by [one bridge].

This bridge is dispensed with if the forwarding of the one, single telephone line [reserved for the procedure] from one primary dialing system to the other primary dialing system [as III. Line] only
to a single telephone and an [extra] alarm clock (W) nearby / by the telephone
[e.g. Eg: at home in the study]
or
only to two telephones with an alarm switch (WUM), each with an [extra] alarm clock (W) nearby / at the telephone

[e.g. Eg: on the executive phone and on the secretary phone in the company]
he follows!

W5.

When interconnecting two primary dialing systems

• - according to / see W4.
• - with full accessibility for all phones / participants to III. Line using the 3rd line key (3rd LT) can be for the operator - on both primary dialers, on their phone, connect a special control box (BK ') by even more functions are installed: e.g. B .:
• - Document lamps for technical telephone lines both dialing systems, or at least each one other dialing system,
• - Additional 3rd line keys (3rd LT) of all telephones / Participants who are parallel to those of the individual Participants of the other primary dialing system are switched and are labeled with the corresponding phone number.

With the help of this 3rd line key (3rd LT) the Operator of a first-time dialing system position with a telephone / subscriber of the other first Make dialing system to z. B.

• - an incoming exchange call from a primary dialer to a telephone / subscriber of the other first dialers location - via the technical number of your own II. Line z. B. "8", which is then the III. Lead is to convey further.

Is d. requested phone / subscriber busy because he just a telephone connection using the 2nd line button (2nd LT), a call - as already described - with the help of the common call relay (GRR) of the 2nd line u. the high-resistance relay coil of the relay (B), on the one AC voltage is applied in the call rhythm, transmitted - as a humming sound.

If the participant hangs up the receiver briefly, he has the Picking up the handset the outside call from the other first Dialing system!  

To prevent the existing telephone connection from being disconnected using the 2nd line key (2nd LT), the following sequence must be followed when setting up:
Technical telephone line - supplementary circuit (EGS) with the automatic changeover switch (AWADO) - then first the relay contacts of the 3rd line relay (3LR) - and then only the relay contacts of the 2nd line relay (2LR) - and then the telephone!

Sch.) Conclusion

From d. Previously described [Examples: Section 1. , .)] shows that not only the other subscriber to the common, technical telephone line can be dialed via the one, single, common telephone line (II. line),
but also an [important] conversation is possible if the other subscriber has already seized the common, technical telephone line!

With a second dialer [Examples: Section 2. . .)] this can be achieved even better because this is completely made and no additional Additional boxes (BK) for extended supplementary circuit need to be wired.

You also get an extension with the procedure, although the primary dialer is not for direct dialing is provided!

And an extension with a radio dialing system is today very desirable.

This is particularly advantageous for small dialing systems, if an extension is not planned there.  

Table 1a

Connection types with a second dialing system

Table 1b

Connection types with a second dialing system

Table 2

Storage area for the phone numbers

Table 3

Reference numerals / components of the drawings

Claims (18)

1. Procedure for an extended supplementary circuit for connecting
2 phones each on several phone lines with their own call no. also with connection to each other according to [the procedure according to] DE 199 40 801, whereby an expansion circuit (EGS) with an automatic changeover switch (AWADO) and 2 telephones are connected to [almost] every telephone line,
is characterized in that each subscriber can separate his phone from his own phone line with the help of a 2nd line key (2nd LT) and
to one, single [reserved for all subscribers] common telephone line (2nd line), over which he can then:

• - can dial the second subscriber of his own technical telephone line [of the dialing system], or
• - can still establish a telephone connection, even if the second subscriber has already seized his own technical telephone line [of the dialing system]!

2. Procedure for a second-dialing system, which is connected to normal telephone lines of the first-dialing system with / via several exchange lines "without direct dialing" and the exchange call arrives at a normal telephone, whereby an extended supplementary circuit is available with the first-dialing system The method of claim 1, [or only according to the method of DE 199 40 801] is characterized in that when selecting the code for the relay control [z. E.g .: "(7) 2"] from a subscriber of the primary dialing system with the help of the relay contact (R contact) not only the changeover relay (UM)

• - the first dialer, but
• - also one of the second dialing system

controls so that a selection of a second participant of the second-dialing systems is possible. 3. The method for a second-dialing system according to claim 2, which is connected to normal telephone lines of the first-dialing system and is equipped with a memory (SP), where operating states are stored for later use and with a selection evaluation circuit (WAS), which is based on content of the memory (SP) is characterized in that when dialing from a subscriber of the second-dialing system, the dialing evaluation circuit (WAS) compares the dialed number with a part of the number of the memory (SP) and with an internal connection -
with d. subscriber circuit / subscriber location / subscriber / handset belonging to the call number,
or with an external connection -
if the dialed number does not exist connects to an outside line / with an outside line and
forwards the dialed number to the primary dialing system. 4. The method for a second-dialing system according to claim 2 + 3, characterized in that when dialing from a subscriber of the second-dialing system - to a second subscriber in the first-dialing system, the dialing evaluation circuit (WAS) dials the dialed number with a Compares part of the number of the memory (SP) and recognizes them after unsuccessful searches,
that it is an external connection - but by choosing the code for the relay control [z. E.g .: "(7) 2"], which belongs to the phone number, actuates a second relay (ZR) with a make contact (zr ^I ) - with the help of which the changeover relay (UM) in the primary dialing system is activated and
forwards the dialed number to the primary dialing system - but without the code for relay control [e.g. For example: "(7) 2"], which belongs to the complete number - that is, only the "rest" number. 5. The method for a second-dialing system according to claims 2-4, characterized in that in a choice of one participant d. Second dialing system to a second subscriber within the second dialing system the dial evaluation circuit (WAS) with this internal connection despite the choice of the code for the relay control [z. E.g .: "(7) 2"] which belongs to the number, does not control the second relay (ZR) with the make contact (zr ^I ). 6. The method for a second-dialing system according to claim 2-5, is characterized in that when dialing from a subscriber of the second dialing system out to a second participant between the code for relay control [e.g. E.g .: "(7) 2"], which belongs to the complete phone number and the "rest" number of the handset does not hang up [- the connection was not interrupted. . .] must become, but can be elected immediately!   7. A method for a second-dialing system with cordless telephones / with handsets according to claims 2-6, wherein the transmission of digital signals between a radio part d. Second-dialing system and a cordless telephone / a handset consist of a system-specific and a subscriber-specific part, is characterized in that the subscriber-specific part of the digital signals is composed of 3 following parts:

• - a second subscriber control bit (2TAB)
  [≘ no 2nd subscriber control or
  1 ≘ a second subscriber control] and
• - a consecutive bit combination [e.g. E.g .: 2 bits], which is assigned to the "rest" call number, and
• - a second participant bit (z)
  [≘ 1st participant or
  1 ≘ 2nd participant].

8. Procedure for using a second dialer corded phones according to d. Claims 2, 3 (+ 7), is characterized in that a participant location of the second-dialing system with corded which phones are the same as the subscriber-specific part of the digital signals from a second dialer cordless phones / with handsets, however without the [first] 2nd subscriber control bit (2TAB) corresponds to according to the phone number, the dial evaluation circuit (WAS) with the help of the number part of the memory (SP) in the Converted participant situation.   9. The method for a second-dialing system with cordless telephones / with handsets according to claim 2 + 7, is characterized in that the second subscriber control bit (2TAB) from the subscriber-specific part of the digital signals.
[≘ no 2nd subscriber control or
1 ≘ a second subscriber control]
in the cordless telephones / handsets causes a second subscriber control symbol / sign to appear in the display. 10. Extended supplementary circuit for connecting 2 telephones each to several telephone lines with their own call no. also with connection to one another according to the method according to DE 199 40 801 and according to claim 1, wherein on [almost] each telephone line an additional circuit (EGS) with an automatic changeover switch (AWADO) and 2 telephones are connected, is characterized in that each subscriber has a 2nd line key (2nd LT) with a changeover contact in a separate control box (BK) [in which the 2nd subscriber control lamp (2TA) is also],
on d. one in an expansion circuit (ERWS)
[- the one behind the supplementary circuit (EGS)
199 DE 199 40 801 is connected -] the associated 2nd line relay (2LR) is connected,
with two sequential changeover contacts (2lr ^{I + II} )
[- for the a / b line -] on which his phone [as with a series system the speech and dialing circuit] and
his own telephone line [like the house line in a row system] is connected,
whereby at the beginning of all subsequent changeover contacts (2lr ^{I + II} ) - all subscribers that are connected in series - one, only [reserved for the procedure] common telephone line (2nd line) is connected. 11. Extended supplementary circuit according to claim 10, characterized in that at the beginning of all subsequent changeover contacts (2lr ^{I + II} ) - all participants that are connected in series - in the one, single, common telephone line (II. Line) 2 identical relay coils one Allocation relays (B) are looped in, with a sequential changeover contact (b ^I ) - whose common, middle contact spring is connected to plus (+) and to the inner normally closed contact spring there is a control chain with one connection (ak '), every 2nd line key (2nd LT) are connected in series [on] and on the working medium contact spring there is a connection (hbl) to which a further holding contact (2lr ^V ) of all / every 2nd line relay (2LR) is connected
[- so that the controlled 2nd line relay (2LR) remains activated until the end of the call even after the loose 2nd line key (2nd LT) is released!]
[NB: an external normally closed contact spring of the sequence switching contact (b ^I ) remains unoccupied]. 12. Extended supplementary circuit according to claim 10 + 11, is characterized in that at the connection (hbl) in each separate control box (BK) [for the telephones / participants] each a [busy] receipt lamp (BL) is connected, which is installed in the 2nd line key (2nd LT). 13. Extended supplementary circuit according to claim 10, characterized in that with the help of two further contacts (2lr ^{III + IV} ) [each] of the 2nd line relay (2LR) the associated, separate - in the actuated case - telephone line on a common call line ( GRL) is connected to which a common call relay (GRR) is connected via a call capacitor (C3). 14. Extended supplementary circuit according to claim 11 + 13, characterized in that two working contacts (grr ^{I + II} ) of the common call relay (GRR) - in the actuated case - an AC voltage to a further, high-resistance relay coil of the occupancy relay (B) [connections: ( 5 + 6 )]
[so that a ripple voltage {in the ring rhythm} is superimposed on the common telephone line (2nd line) - to signal a call on the own telephone line]. 15. Second-dialing system for expanding a first-dialing system according to the method according to DE 199 40 801 and according to claim 1 - with the method according to claim 2 + 4, with all the usual modules, in particular with several exchange lines / exchange rates without direct dialing - whereby the exchange call is placed on a normal subscriber circuit, with inquiry and transfer technology for each subscriber and at least one internal connection / an internal connection set and a memory (SP) for storing operating states of all modules and with a selection evaluation circuit (WAS ), which can access contents of the memory (SP), is characterized in that
in each exchange line, each exchange lines is a supplementary circuit (EGS) similar to DE 199 40 801, but without an automatic changeover switch (AWADO) and without subscriber lamp 1 (TL1) and subscriber lamp 2 (TL2), but with a changeover contact (r2 ^I ) Call 2 relay (R2) of a switchover of the outside call:
from the first participant to the second participant [from d. first subscriber circuit to the second subscriber circuit] and
is equipped with a second relay (ZR) with a normally open contact (zr ^I ) which is controlled by the selection evaluation circuit (WAS) when a second subscriber has been selected in the first dialing system. 16. Second-dialing system according to claim 15, is characterized in that the second dialing system with corded telephones, or with cordless phones / with handsets, or can be equipped from a combination of both.   17. Second-dialing system according to claim 15 + 16, characterized in that the number of exchange lines / exchange rates without direct dialing in the second-dialing system
[- with a relay contact (R contact) of the primary dialing system with the changeover relay (UM) connected to it]
is half the number of
Phones / subscribers / handsets
[- whereby (a) special trunk line (s) z. For example: "II." / A special office rate (A.II) / special office rates and with individually connected special phone (s) / subscriber / handset z. E.g .: "8" do not count!] And that each exchange line / each exchange rate has a first subscriber and a second subscriber, e.g. E.g .: "5" and "(7) 25"
[- a first subscriber circuit and a second subscriber circuit]
assigned. 18. Extended supplementary circuit according to claim 10,
[with a method according to claim 1]
with a second dialing system according to claim 15-17, [with a method according to claim 2 + 4 (+ 5)],
is characterized in that the changeover relay (UM) of the first dialing system and the changeover relay (UM) of the second dialing system as well
the relay contact (R contact) of the first dialing system and the make contact (zr ^I ) of the second relay (ZR) of the second dialing system
are connected in parallel by [a bridge].