Multiplex communications – Wide area network – Packet switching
Patent
1983-08-08
1985-12-03
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
179 18ES, H04Q 1104
Patent
active
045569711
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to an apparatus for loading memories in a telecommunication exchange, including line modules, to each of which lines are connected for communication with terminals (subscriber apparatus, data terminals etc) as well as with external apparatus (subscriber exchanges, printers, communication networks etc), line modules being provided with control computers for establishing communication between terminals and also between terminals and external apparatus, communication between terminals associated with different modules being established over a digital group selector.
BACKGROUND ART
A telecommunication exchange of the type mentioned is described in the publication "A PABX concept combining a new method of decentralized control and PCM switching", International Switching Symposium, Paris 1979. With respect to conventional telephony it enables a large number of different functions, e.g. intercom, TELEX, video communication, data communication etc. and is modularly extendable without resorting to intervention in the existing modular line units.
In putting an exchange with a number of modules into service the program must be written into each of the memories. This question is time consuming, since in transferring data information from a tape recorder, for example, the recorder must be connected in turn to each of the modules which are not necessarily in the same building, but may be mutually spaced at distances in the order of magnitude of one kilometer from each other.
DISCLOSURE OF INVENTION
An object of the invention is to simplify writing data information such that it can take place in a single process, and centrally, without the data information source needing to be moved.
The invention is characterized as disclosed in the claims.
BRIEF DESCRIPTION OF DRAWINGS
The invention is described in detail below with the aid of an embodiment and with reference to the appended drawing, on which
FIG. 1 illustrates, in the form of a block diagram, a telecommunication exchange with an apparatus in accordance with the invention, and
FIG. 2 illustrates an example of the information flow supplied to the exchange when starting up.
PRESENTLY PREFERRED EMBODIMENT OF THE INVENTION
In FIG. 1 line modules are denoted by LIM 1-LIM 32 to which telephone subscribers are connected each through its line equipment ELC and external lines, e.g. to and from other exchanges, through line equipment BTC. Each module contains a control computer LPU, the memory unit MEU of which includes an instruction memory PS and a data memory DS (operation memory). A tape recorder is denoted by BS and a write terminal by ST with the aid of which data information can be supplied to the control computer LPU via I/O equipment. A digital selector means LV is used to establish telephone communication with a subscriber connected to the same module, and via a group selector means GV also to a subscriber connected to another module LIM. Such a telecommunication exchange is previously known from the publication mentioned in the introduction.
When there is the question of introducing new data information in the program or data memory in one or more of the control computers LPU the tape recorder BS, which contains the new information, must be connected to each of the modules, which can be positioned up to 1 km from each other. This can be very time-consuming.
In accordance with the invention, the tape recorder BS needs only to be connected to one of the modules, and from there the data information can be transferred to each of the modules without the data information source being moved. For this purpose the memory unit MEU in each module is provided with an unchangeable memory MIN, such as a read only memory, (start up memory) in which initial information is inserted without regard to the future identity of the module, which the latter will receive with regard to its position in the exchange. The initial information enables each module to carry out certain functions when the system is put into operation. This informatio
REFERENCES:
patent: 4154988 (1979-05-01), Fechalos et al.
patent: 4296403 (1981-10-01), Haensel
patent: 4466062 (1984-08-01), Krikor
"Ericsson Review", No. 1, 1982, vol. 59.
"A PABX Concept Combining a New Method of Decentralized Control and PCM Switching", Session 13B PABX (11) I.S.S., Paris 1979.
Olms Douglas W.
Rokoff Kenneth I.
Telefonaktiebolaget LM Ericsson
LandOfFree
Apparatus for loading memories in a telecommunication exchange does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus for loading memories in a telecommunication exchange, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for loading memories in a telecommunication exchange will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1398177