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Service integrated transmission system
| Details |
Inventors: Koeck, Klaus;
Assignee: Licentia Patent-Verwaltungs-G.m.b.H. (Frankfurt am Main, DE)
Primary Examiner: Olms; Douglas W.
Assistant Examiner: Rokoff; Kenneth I.
Attorney, Agent or Firm: Spencer & Frank
A method of transmitting signals of different information rates between a subscriber and a central exchange of a service integrated system operating in time multiplex wherein the signals to be transmitted are combined at the transmitting end by means of multiplexers and the transmitted signals are recovered at the receiving end by means of demultiplexers. The frequency of the time multiplex frame, i.e. the frame frequency, is selected to be equal to the smallest information rate of the signals to be transmitted and one information unit of the signal having the smallest information rate is transmitted per frame. |
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DETAILED DESCRIPTION It is therefore the object of the present invention to provide a method of operating a transmission system of the above type which permits, at the transmitting end, a combination of signals of different information rates by means of multiplexers and the recovery of these transmitted multiplexed signals at the receiving end by means of demultiplexers, each by essentially inexpensive means.
The above object is basically achieved according to the present invention in that in a method of transmitting signals of different information rates between a subscriber station and a central exchange of a service integrated system operating in time multiplex including the steps of combining the signals of different information rates to be transmitted at the transmitting end of the system by time multiplexing same and recovering the time multiplexed transmitted signals at the receiving end by demultiplexing the received signals, the time multiplex frame frequency (f.
sub.
F) is selected to be equal to the smallest information rate of the signals to be transmitted and one information unit of the signal having the smallest information rate is transmitted per frame.
The system and method according to the present invention result in the advantages that the multiplex and demultiplex formation can be effected based on an optimum time multiplex frame frequency and, due to the fact that one information unit of the signal with the smallest information rate, i.
e.
, the most narrowband signal, is transmitted per frame, this can be effected in a substantially inexpensive manner.
In one embodiment of the invention, an advantageous frame structure is provided in which the information units of the narrowband signals are accommodated in the head portion of the frame.
In further embodiments of the invention it is possible also to transmit internal, slow report signals, such as alarms, stuffing control signals, etc.
For the normal case in which the streams of data transmitted by a subscriber station are significantly less than the streams of data received at the subscriber's station, a further advantageous transmitting frame structure at the subscriber's end is disclosed which permits the saving of expensive means
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I/O Systems 
