Digital signal repeating system
First Claim
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1. A digital signal repeating system, comprising:
- a plurality of digital signal transmission systems interconnected by repeating installations, each such system being a time division multiple access system of the type in which multiple stations access a communication cable by transmitting packets of information during available time slots of successive periodically repeated frames, each one of said stations selecting a time slot for transmission of its packets on a time slot available basis, wherein each of said repeating installations comprises;
input/output means for effecting digital signal input or output operations between two signal transmission systems interconnected by said repeating installation, packet selecting means for selecting only packets to be sent from one of said two signal transmission systems to the other signal transmission system, buffer memory means for writing thereinto transfer information of a packet which is to be sent to said other signal transmission system and which is selected by said packet selecting means, and transmission control means for reading out the transfer information so as to transmit it as a packet to said other signal transmission system, thereby enabling digital signal transmission in packet form between different signal transmission systems in one and the same communication system;
said transmission control means comprising frame detection means responsive to the digital signal transmissions on said other signal transmission system for controlling the time of transmission of said packet to place said packet within said frame in a time slot not otherwise occupied by digital signal transmissions.
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Abstract
A communication system includes a plurality of digital signal transmission systems each connected to the next by a repeater installation. Signal packets travelling from a station in one system to a station in another adjacent system are picked out by a repeater station and stored in a buffer memory. The contents of the memory are compiled into a packet for transmission to the other system, with an address designating the station of the other system, and are inserted into an empty block or blocks of a periodically repeated frame of the other system with a waiting time of less than one complete frame.
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Citations
10 Claims
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1. A digital signal repeating system, comprising:
- a plurality of digital signal transmission systems interconnected by repeating installations, each such system being a time division multiple access system of the type in which multiple stations access a communication cable by transmitting packets of information during available time slots of successive periodically repeated frames, each one of said stations selecting a time slot for transmission of its packets on a time slot available basis, wherein each of said repeating installations comprises;
input/output means for effecting digital signal input or output operations between two signal transmission systems interconnected by said repeating installation, packet selecting means for selecting only packets to be sent from one of said two signal transmission systems to the other signal transmission system, buffer memory means for writing thereinto transfer information of a packet which is to be sent to said other signal transmission system and which is selected by said packet selecting means, and transmission control means for reading out the transfer information so as to transmit it as a packet to said other signal transmission system, thereby enabling digital signal transmission in packet form between different signal transmission systems in one and the same communication system;
said transmission control means comprising frame detection means responsive to the digital signal transmissions on said other signal transmission system for controlling the time of transmission of said packet to place said packet within said frame in a time slot not otherwise occupied by digital signal transmissions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 10)
- a plurality of digital signal transmission systems interconnected by repeating installations, each such system being a time division multiple access system of the type in which multiple stations access a communication cable by transmitting packets of information during available time slots of successive periodically repeated frames, each one of said stations selecting a time slot for transmission of its packets on a time slot available basis, wherein each of said repeating installations comprises;
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9. A digital signal repeating system according to claim 9, said packet selecting means controlling buffer memory means for the storage of a signal to be transferred, and generating a transfer request signal inputted to said transmission control means.
Specification