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 Signalling system

Details
Inventors: Hemdal, Goran A. H.; Jager, Jonny S.;
Assignee: International Standard Electric Corporation (New York, NY)
Primary Examiner: Heckler; Thomas M.
Assistant Examiner:
Attorney, Agent or Firm: O'Halloran; John T.

Message switching organization for exchanging data messages between function or signalling units within the memory of a processor controlled telecommunications system. Each such function unit has its own program and its own data storage, and the program of a unit has access only to the data storage of its own unit. Messages transmitted between units are of two types, those including information regarding the destination unit address and those omitting destination unit address. Each unit has a message handler area with its own program and data storage, the message handler acting to supply destination unit address information for messages of the second type.

DETAILED DESCRIPTION An object of the present invention is to provide a system of the above type but which however permits signalling units to be substituted into the system without the other signalling units having to be adapted to the new situation.
According to the invention this object is achieved due to the fact that use is made of messages wherein the destination signalling unit is not indicated and that said control means are adapted to allocate a destination signalling unit to each of said messages.
Because the destination is not indicated in the messages, substituting a signalling unit into the system does not affect the contents of the messages to be transmitted to this signalling unit, so that the signalling units originating these messages need not be adapted to the new situation.
The only means required is to inform the control means of the modification and this is a simple operation which can be performed on-line.
Another advantage of the present system is that in case the signalling units are function units of the type described in the above mentioned articles and patent, i.
e.
with own data and own programme, a potential source of errors which may be made by a programmer writing the programme controlling the message transfer is eliminated because the programmer has not to indicate and even not to know the destination of these messages.
He also has not to know the general structure of the system.
Another characteristic feature of the present signalling system is that use is also made of messages wherein the destination signalling unit is indirectly indicated.
Still another characteristic feature of the present signalling system is that said destination signalling unit is indicated in the data associated with the message.
Once the destination is known, use is made of messages wherein the destination is indicated in the data associated with the message, such so-called directed messages requiring less processing time of the control means than those wherein the destination is not at all indicated


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