DE2808706C2 - Centrally controlled telephone exchange with subscribers of different lengths - Google Patents

Description

In telephone extension systems, it is sometimes necessary to assign call numbers of different lengths to the individual subscribers. This applies in particular to special types of systems whose number of participants has reached a certain size. While one is trying on the one hand to keep the subscriber numbers as short as possible, on the other hand there is the problem that not all the initial digits of the possible subscriber numbers are available for the number assignment. So is often z. B. the zero as the first digit - ^ r identification required for a desired trunk assignment. The same applies z. B. for the choice of nine as the first digit, which is often evaluated as an indicator for a connection request to the operator console. Other options for assigning a first dialed digit for a specific connection request can be eight for code dialing, the digit four for cross-connection, and the like. Using a single digit as a code for a desired assignment makes this easier

can be remembered by the participants. If you go z. B. assume that a Vermittlungsaniage If you have 100 subscribers, the two-digit numbers would be used to dial these subscribers Numbers 11 to 00 are sufficient as each subscriber is assigned a different number can. On the other hand, as already explained above, it must be noted that the with eight starting digits, i.e. 81 to 80 because of the code number, the digits starting with 9, i.e. 91 to 90 because of the location code and the digits starting with 0, i.e. 01 to 00 because of the outside line code for the Assignment as subscriber numbers cannot be used. Here one can manage so that add a third prefix to the participants who should be assigned a number 81 to 00, so that these 30 participants have a three-digit phone number.

A special routing makes it possible to

that when choosing the first digit it is decided whether it is a code number or a two-digit or three-digit number. B. before the last 30 call numbers described in more detail above;> 81 "to" 00 "each have a prefix 2 Add. When selecting this 2, the control of the switching system recognizes that one three-digit number should be dialed. After the information that the selected digit is the beginning of a phone number is recorded by the switching system, the other is Evaluation of this first dialed digit 2 is suppressed and it is used for the determination of the Connection position of the selected subscriber only has to choose the following two digits, i.e. one of the Digits 81 to 00 are evaluated by the control

From DE-AS 12 11 283 it is known to change control processes depending on the digits dialed, in particular depending on the first digit dialed (see there, for example, column 3rd line 60 to 64, column 5, line 60 to 66) . The ^{disadvantage:} it st in this arrangement that has to be driven values of the various optional digits dependent control processes jeweüs a significant amount of hardware.

Telephone PBXs in which the subscribers have phone numbers of different lengths are known e.g. from TN-Nachrichten 1972, issue 73, page 11, left column, lines 18 to 23.

It is also known from the Crosspoint telephony system ESK 10000 E that so-called prefix digits are formed that are used to complete election information. These measures are necessary when dialed digits are already used when establishing part of a connection, but for further connection establishment are still needed. In this case, an origin identifier is used to determine off which direction the connection has arrived, and a predefined combination of digits is dependent on this prefixed to the further election information. These prefixes are therefore direction-dependent and are not formed as a function of a first received dialing digit, which is the same as for the object this registration also determines the respective length of the phone number.

It is also known for direct dialing private branch exchanges in order to save digits to be dialed Make revaluations of the phone numbers. So is in DE-AS 12 42 715 bochrieber. How the first received Digit of an extension number through a permanently programmed routing into two new digits is converted. With this circuit arrangement, however, conversions are only possible in groups, whereby considerable losses in number capacity have to be accepted. v>

Another way of completing phone numbers is shown in DE-AS 15 37 847, where with The help of the remote number that is used for long-distance connections because of the limitation of the transferable Number of digits missing last digit of a phone number can be reproduced. That last digit is permanently pre-programmed and not dependent on the previously dialed digits of a phone number. For this species However, the completion of phone numbers requires a special criterion that is not required for every 6: Connection occurs and, among other things, a complicated logic of distinction requires.

The object of the present invention is to provide a centrally controlled, simply structured, private branch exchange system to create, in which the individual subscribers assigned phone numbers of different lengths can be, regardless of the length of the individual phone numbers that are used to establish the connection necessary processing steps remain largely the same.

The present invention is therefore based on a centrally controlled telephone exchange Subscribers of different phone number lengths, of which the longest phone number has / 7 digits and the individual phone numbers have a length that depends on the first digit to be dialed.

According to the invention, the object set is achieved in that set out in claim 1 Combination of features.

The invention consists in principle, regardless of the length of the phone numbers individual subscribers always use these call numbers for processing within the central controller to bring it to the same length. This has the advantage that the processing of the n-place dialed numbers as well as the possibly on / 7-Sielles extended call numbers can be done through the same processing steps. The two phone numbers different lengths can therefore be treated in the same way by the control system, resulting in identical Program sequences for all call number lengths occurring in the system and thus to a reduced one Control effort leads.

On the other hand, the use of phone numbers of different lengths offers a number of other options Advantages. So certain users can be highlighted by the length of their phone number, a There is a similar possibility with regard to special services such as B. Monitoring bodies for Fire warning. Tool kits, disaster control, etc.

Another advantage of using phone numbers of different lengths can be exist that a system is expanded to the extent that two-digit numbers for the identification of all participants are no longer sufficient, but the old two-digit numbers that were valid before the expansion should not be given up, at least in part.

A particularly simple structure to complete the shortened number dialed results from the combination of features set out in claim 2. After that, due to the first dialed digit recognized whether it is a short number or a number with a maximum length of / 7 digits. Depending on the result recognized in this way Either one is sufficient to fill up the number to be dialed to a total of n digits Group of digits is always placed at the beginning of the connection to be processed by the central controller or, if it is an n-digit Phone number, the individual digits dialed one after the other are placed in the relevant register. It does not have to be a dial-up register that is centrally assigned to all participants. but the dialed digits can also be put into a status memory, which is for each Participant separately records his current state, so z. B. also Hesse just dialed number.

By means of the first digit to determine what type of phone number it is acts, it is achieved that the following

Control processes of the central control independent of the phone number length. In principle, there is another possibility of adding a number in counting the number of digits dialed and only then a corresponding addition to n-digits to undertake.

Basically there are now two ways of evaluating the first one chosen by the participant Digit. On the one hand, all selectable first digits can be stored in a code number memory save the short numbers that need to be added by the central controller. Above The first digit actually dialed by a subscriber with the memory content then becomes a comparator this code number memory compared. Can be a match between the first digit dialed and one of the digits stored in the code number memory are determined, this is a symbol for the The number to be chosen needs to be supplemented.

The respective group of digits to be supplemented can be assigned to the associated stored Digits must be stored in the code memory or elsewhere.

The second possibility is to store those digits in a code memory that as the first digit dialed by a subscriber, indicate a complete n-digit phone number. Will then by comparing the first digit dialed with the digits stored in the code memory, a If a match is found, this indicates that the port number is a complete one acts (the connection number is the same as the phone number) and is therefore not an addition by a group of digits is necessary. In this case, the individual digits dialed are sequential stored in the elective memory without any additions.

Two simple configurations of these two possibilities are in an advantageous development of the Invention described in claims 3 and 4. One will preferably proceed in such a way that you save the first digits in the code memory, which occur less. Are z. B. only If a few short numbers are provided, which also all have the same digit, the is recommended Configuration according to claim 3. Conversely, there are only a few first digits that differ from one another if there are / 7-digit numbers, the Arrangement according to claim 4 to be preferred.

A further simplification can be achieved by a combination of features set out in claim 5, which is aimed at only a constant number of digits with regard to the short phone numbers to allow. The advantage that can be achieved in this way is, in particular, that the supplementary Groups of digits always have the same length. Incidentally, you can do this with a single get by with an unchangeable group of digits that applies to all short numbers.

A further simplification can be achieved according to claim 6 in that one has a switching system with three-digit numbers and only allows two-digit numbers as shortened numbers. the The supplementary group of digits then only consists of a single digit that cannot be changed.

Advantageous further developments of the invention emerge from the subclaims.

An embodiment of the invention is illustrated below with reference to the drawing, show therein

Fig. 1 in a symbolic and highly simplified manner

Representation of dialing a number shortened by two digits compared to the longest number and their transfer in a converted form in an election memory,

F i g. 2 in a representation similar to that in FIG. 1 the choice of a three-digit participant by a two-digit participant Participants and

ίο F i g. 3 the election of the two-digit participant a three-digit subscriber in accordance with the arrangement according to FIG. 2.

In Fig. 1, the subscriber lines 71, T2 are shown, which belong to a telephone exchange. In this telephone exchange the subscribers regularly have 4-digit numbers and in this embodiment η has the value 4. It is also assumed that the vast majority of subscriber lines have four-digit numbers, while there are only a few subscriber lines with two-digit numbers. The subscriber line TI is representative of this. It is now assumed that the subscriber connection Ti with the call number 5172 would like to establish a connection to the subscriber with the two-digit call number 37. Ti therefore begins to select a "3" as the first digit, which arrives via an information line IL to a digit supplement device ZEE , which is framed by a thin dashed line. The incoming selected first digit »3« is compared via a comparator with the content of the code numbers stored in the individual lines of a code number memory KZS. In the present example it should be assumed that, among other single-digit codes, code 3 is also stored in a line Z of KZS. The dial information identification device IE, which also includes the comparator V and the code memory KZS , recognizes that the first digit "3" selected by Π must be the first digit of a short call number, since only the codes are stored in KZS , which each form the first digit of the abbreviated phone number. Of course, in addition to the one shown in FIG. 1 indicated stored code number »3«, other code numbers can also be stored.

The identity established by the dialing information recognition device IE indicates that the abbreviated call number must be supplemented by a specific group of digits. Accordingly spokesman ^"1 of the comparator V, a group of digits donors ZGG activated in which is stored for additional group of digits under reference number 3. Of course, there are other ways to save this group of digits. So this may be, for. Example, directly under reference number 3 in the Line Z of the code memory KZS can be stored and if identity is given via the comparator. The digit group "91" thus found is entered by the digit group transmitter ZGG into the first two digits of a dial memory WAS , whereupon the input of the digit chosen by Ti as the first digit takes place »3« followed. The second digit »7« of the desired number »37« dialed by Ti is then routed via the comparator V directly to the selection memory WAS , so that the connection number »9137«, which is used for further processing by the control, is stored there

Above it has already been indicated that corresponding code numbers can be entered in the code memory KZS different first digits of short call numbers, so z. B. "3", "4" and "6". In this case, however, different groups of digits can be assigned to the individual codes, oie then get into the first digits of the dialing memory WAS when this code is addressed by dialing a subscriber. One point of this measure can be to be able to make the same subscriber distinctions by assigning different groups of digits in the dialing memory WAS as are possible with the first digits of the short call numbers. This allows different evaluations in the treatment of the individual short call numbers of the individual subscribers to be brought about by the central controller.

It can also be seen that by adding z. B. the group of digits "91" in FIG. 1 finally there is a connection number in the WMS, which as Call number for the subscriber 72 is not allowed, because when you choose the subscriber calling automatically to the Operator position would arrive (because of the selection of the first digit "9").

In FIGS. 2 and 3, a combination of features has now been assumed with regard to the storage in the code number memory KZS, as was explained in more detail in claim 5, while the exemplary embodiment according to FIG. 1 relates to a combination according to claim 4.

In Figure 2, the subscriber 74 tries the subscriber line 73 can be reached with the number »781«. As a result, he chooses one as the first digit »7«, which is contained in one of the lines Z of the code memory. Through the SOlrlü through the Vefgieicher V Identified identity is an indication that the number to be dialed is a number that has the usual length for the system.

This is precisely the reverse case as in the exemplary embodiment in FIG. 1 where from the identity on a shortened number was closed.

Since in the exemplary embodiment according to FIG. 2 the dialing of an unabridged call number was determined, the comparator V blocks the digit group transmitter ZCG and forwards the first dialed digit "7" to the dialing memory WAS. The other dialed digits "8" and "1" are then entered into the dialing record in the same way, so that the complete call number is there, which is made up exclusively of dialed digits. The way in which the individual dialed digits now get from the information line IL into the dial record is not the subject of the present invention and should therefore not be explained in more detail. The same applies to the type of storage of the individual digits in the election memory, which z. B. can be done in parallel or in series with or without intermediate storage.

In Fig. 3 is finally indicated, like the

ίο Subscriber line 73 seeks to establish a connection to subscriber line Γ4 of the short number "56". The first dialing digit "5" first output by 73 via the information line IL is not a code number in the code number memory KZS

is listed what is indicated by a blank line Z. From this it follows, according to the definitions already given above, that the call number dialed by subscriber 73 must be a short call number. The character group generator ZCC is thus addressed by the comparator V , which contains the number group “3” under the code number “5”, which is then entered in the dial record WAS . After the group of digits "3" has been added, the first digit "5" dialed is added to the WAS . Then the second digit "6" selected from 73 is entered into the WAS via the comparator, so that the complete connection number "356" is entered in the WAS and is available for further processing.

From Fig. 2 and 3 it can be seen that a three-digit number is ultimately always written in the WAS and is available for further processing by the central controller, although the two subscriber lines 73 and 74 have call numbers of different lengths.

Another simplification of the invention can also be seen from FIG. It can namely be provided for each case of a short call number (in which no corresponding code number is contained in KZS ) always provide the same group of digits as a supplement, z. B. can always be a »3« regardless of the selected first digit of the short call number. In this case, all added connection numbers begin with the number 3. This results in a simplification of the digit group generator ZGG, which consists of a simple memory location in which a "3" is stored, which is stored under the conditions specified above.

For this purpose 3 sheets of drawings

Claims (6)

Patent claims: 1. Centrally controlled private branch exchange with subscribers of different length, of which the longest number has n-digits and the individual numbers have a length dependent on the first digit to be dialed, characterized in that a digit supplement device (ZEE) the selected Ar digits (»3 ',' 7 ") of a Anstelligen (2 digits) short number by prepending a predetermined, and the first dialed digit (" 3 ") dependent (n -Anstelligen group of digits (" 91 ") digit n-a (4 digits) Connection number ("9137"), if necessary (if η not equal to Ic) , which is subjected to the same processing steps as an n-digit dialed number (e.g. "5172") in the following control processes of the central controller. 2. Centrally controlled telephone branch exchange according to claim 1, characterized in that the digit supplement device (ZEE) is provided with a dialing information recognition device (IE) for recognizing the first dialed digit ("3") of a call number ("37") and a digit group transmitter (ZGG) , which, depending on the identification of the first dialed digit ("3"), the associated group of digits ("91") together with the attached first dialed digit ("3") is used to record the dialed number ("37") Dialing memory (WAS) and that the digits dialed afterwards (»7«) of the call number are entered one after the other directly into the following digits of the recording memory. 3. Centrally controlled telephone branch exchange according to claim 1 or 2, characterized in that the dialing information recognition device (/ fine code number memory (KZS) has, in which the possible first digits (z. B. "3") short call numbers (z. B. "37") ) are stored, which are compared with the first digits (e.g. "3") of the call numbers ("37") just dialed via a comparator (V) that, if they match, those of the respective stored digit (e.g. "3") assigned group of digits e.g. ("91") placed in front of the first dialed digit, and the combination of digits formed in this way (e.g. "913") in the front digits of a memory used to store the currently dialed number ( WHAT) is given, in which the dialed digits following the first digit (e.g. "7") of the call number are entered directly one after the other and, if they do not match, all dialed digits, e.g. ("5172") one after the other in the dialing memory (WHAT) are given (Fig. 1). 4. Centrally controlled telephone private branch exchange according to claim 1 or 2, characterized in that the dialing information recognition device (IE) has a code number memory (KZS) in which the possible first digits (z. B. "7") of call numbers (z. B. "781 ") Are stored, which are compared with the respective first digits (e.g." 7 ") of the call numbers just dialed (e.g." 781 ") that if they do not match (e.g." 5 "in FIG 3) a fixed group of digits (e.g. "3") is placed in front of the first selected digit (/ .. B. "5") and the one formed in this way Combination of digits is entered in the first digits of a memory (WAS) that is used to store the currently dialed number (e.g. "56"), in which the dialed digits following the first digit ("3") (e.g. "5") entered directly one after the other and that if they match (Fig. 2) all dialed digits ("7, 8, 1") of the call number ("781") are entered one after the other in the dialing memory (WAS) . 5. Centrally controlled telephone exchange according to claim 4, characterized in that the short numbers always have the same number (e.g. two) of digits and that, if none Establish a match between one of the stored digits and the first digit dialed is, a constant group of digits of the first digit dialed to form the connection number is prepended. 6. Centrally controlled telephone exchange according to claim 5, characterized in that π has the value 3, the shortened call numbers always have two digits and the group of digits consists of a single digit.