DE2842040A1 - Coded multiple frequency signal exchange circuit - has transmitter for AF signals in peripheral control unit connected by multiplex line to connecting circuits - Google Patents

Abstract

The signals are exchanged over connecting lines between centrally controlled telephone exchanges. The system ensures that connecting circuits transmitting the AF signals are regulated by peripheral control units connected to the central control unit. Each line bunch of a peripheral control unit has a transmitter for the coded multiple frequency AF signals. It is connected through a common multiplex line to the connecting circuits belonging to the line bunch. A large number of telephones may be connected in the network.

Description

Circuit arrangement for exchanging coded multiple

Frequent sound signals via connecting lines between the central controlled tele exchange systems centrally controlled tele exchange systems The present invention relates to a circuit arrangement for exchanging coded multi-frequency audio signals via connecting lines between centrally controlled Telephone exchanges in which the control of the emit the tone signals Connection sets via a peripheral connected to the central control unit Control unit takes place.

In known circuit arrangements of the type mentioned above, it is known to generate the coded multi-frequency audio signals by means of transmitting devices, which are provided per connection set, e.g. per exchange line or per cross connection set are. Circuit arrangements of the type mentioned above are also known in which the transmission devices for the coded multi-frequency audio signals as so-called Wahlenachsendesätze are formed, which during the connection establishment the respective Connection sets can be assigned via a switching network. In these known circuit arrangements a relatively large number of transmission facilities are required. Are the broadcast facilities designed as optional end-of-line sentences, there is another disadvantage, namely that a relatively large amount of tax expense is necessary.

The object of the invention is to provide a circuit arrangement of the type mentioned at the beginning, which is mainly characterized by that it is inexpensive.

According to the invention, this object is achieved in that each line bundle a peripheral control unit a transmitter for the coded multi-frequency Tone signals are provided over a multiple line common to the line bundle connected in multiplex operation to the connection sets belonging to the trunk group is.

In a circuit arrangement according to the invention, only few transmission devices are required for the coded multi-frequency audio signals. Since transmission devices of this type are still very expensive today, the Circuit arrangement despite the additional expense for multiplexing a a cost-effective solution.

Another advantage of the solution according to the invention is to be seen in that especially with centrally controlled telephone exchanges an easy Retrofitting is possible, e.g. from IKZ (pulse indicator) to SKZ (loop indicator), there is only an exchange of the connection sets and the respective Typesetting programs necessary is. Program changes for the exchange of coded multifrequency Tone signals between telephone exchanges, e.g. when switching from Impulse to DTMF dialing do not have to be intercepted in the central control, but can be intercepted in the typesetting programs, which are inevitably exchanged Need to become. It is also possible to switch to other frequencies or codings also easily done by exchanging the sending device and the typesetting program.

The circuit arrangement according to the invention will be based on the following an embodiment shown in the drawing are described in more detail, further expedient refinements of the circuit arrangement according to the invention as well as further advantages result from the following description.

As a possible embodiment of the circuit arrangement according to the invention a centrally controlled private branch exchange is shown in the figure. First, the function of the PBX shown should be without the illustrated transmitting device SE are explained.

Of the many possible subscriber stations of the private branch exchange shown are the two subscriber stations NT1 and NT2 with their associated subscriber circuits TI and T2 shown, also two official sentences ASi and AS2 as well as two election acceptance sentences WS1 and WS2. There is also a switchboard BF with its associated connection set VMS and a house record HS, over which the internal calls take place, are shown.

The individual subscriber circuits, office records, dialing memory records, House sets and the connection sets for the Operator stations are connected to the coupling network SK. The subscriber circuits are still with a partial control for subscriber circuits TSt connected. This partial control TSt for subscriber circuits are assigned switching means that are cyclical Scanning query the switching status of the subscriber circuits. Furthermore, the Office records assigned to a common partial control for exchange records ASt. The official sentences are used to establish incoming and outgoing trunk connections and are over the coupling network SK with each authorized subscriber in the private branch exchange connectable.

The dialing memory sets that are used to hold dialing information about serve the coupling network are with a partial control for dial memory networks WSt tied together. The connection kit for the operator console is also VMS - it can also be several - connected to the partial control, in the figure shown with the partial control for the connection sets of operator telephones VSt. The existing house records with a partial control for house records are in the same way HSt connected.

The individual sub-controls, which represent the peripheral control units, can exchange information via a common data transmission line bundle B. and also give commands, with the help of the central control unit SPSt. In addition, additional connection means and facilities can be used for testing LASP and monitoring.

Special devices can be connected to the common data transmission line bundle B. For example, the special control SdSt can be switched on in order to also deal with the individual Partial controls issue information and commands to swap. Every Partial control, i.e. each peripheral control unit, can use the data transmission line bundle B with every other sub-control also for the purpose of exchanging information and Commands to be coupled. As allocation and connection devices for the lines of the Data transmission line bundle B is used for partial control for subscriber circuits TSt assigned part BZT.

In the case of the telephone substation rental system shown, there are now not - as known - per connection set, in the example per exchange line AS, transmitting devices for the coded multi-frequency to be transmitted on the connecting lines L. Sound signals provided, but a peripheral control unit, namely the partial control a transmitter SE is assigned for the ASt office records. This common Transmitter SE is in multi-channel operation via a common multiple line VL to the line bundle LB assigned to the peripheral control unit ASt, connected connection sets.

The peripheral control unit, in the illustrated embodiment the Partial control for the office records ASt, controls the transmitting device SE and the office records AS.

So that the digit code to be transmitted with a single setting process can be marked, the transmitting device receives its own address and e.g. each Eight setting options according to the given code. For example, per office set AS can then a relay can be provided, which over the output of the transmitting device SE the multiple line VL, on which all office sets AS are parallel, to the office sets AS turns on. Regarding the control of the transmitting device SE and the official rates AS can for example be proceeded in such a way that for every digit the actuation of the relay via a record address and the digit coding via a Sender address takes place.

Finally, it should be noted that the peripheral control unit is not only official sentences must be assigned, but that there is also the possibility that one and the same peripheral control unit, e.g. assigned to office records and cross-connection records is.

1 claim 1 figure

Claims (1)

Circuit arrangement for the exchange of coded multifrequency Tone signals via connecting lines between centrally controlled telephone exchanges, in which the control of the connection sets that send out the audio signals is via a peripheral control unit connected to the central control unit takes place, d a d u r c h e k e n n n z e i c h -n e t that each trunk group (LB) of a peripheral Control unit (ASt) a transmitting device (SE) for the coded multi-frequency audio signals is provided over a multiple line common to the line bundle (LB) (VL) in multiplex operation to the connection sets belonging to the trunk group (AS1, AS2) is switched on.