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US 5,499,235 AGranted
Method for the simulation of transmission on a transmission network working in asynchronous transfer mode and simulator of transmission on such a network
AssigneeFrance Telecom
InventorsThierry Houdoin, Jean-Yves Cochennec
Life of this patent
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Abstract
A method for the simulation of transmission on an ATM transmission network and a simulator implementing the method. The simulator includes interfaces for connection with this network, there is generated a digital signal with a format and bit rate corresponding to the standards of transmission on the network, the signal being constituted by cells identifiable by headers, error-generation and the processing of this signal in order to introduce these errors therein. Application to the testing of ATM terminals.
Claims51
A method for the simulation of transmission on an asynchronous transfer mode transmission network, comprising:
- simulating the asynchronous transfer mode network, the simulating step further comprising the step of connecting a reception terminal to a simulator, said reception terminal being capable of receiving signals constituted of cells according to the asynchronous transfer mode format,
- generating a digital signal with a format and bit rate corresponding to a format and a bit rate which are standard for transmissions on the network, the generated digital signal being constituted by cells identifiable by a header,
- generating a signal representative of a simulated transmission error,
- forming a processed signal by introducing the error into an incident signal, wherein said incident signal comprises one of (A) the generated digital signal and (B) a multiplexed signal formed by multiplexing the generated digital signal with a signal received from a transmission terminal, and
- transmitting the processed signal to the reception terminal.
2 more elements
A method for the simulation of transmission on an asynchronous transfer mode transmission network, comprising:
- simulating the asynchronous transfer mode network, the simulating step further comprising the step of connecting a reception terminal to a simulator, said reception terminal being capable of receiving signals constituted of cells according to the asynchronous transfer mode format;
- generating a digital signal with a format and bit rate corresponding to a format and a bit rate which are standard for transmissions on the network, the generated digital signal being constituted by cells identifiable by a header;
- generating a signal representative of a simulated transmission error, the simulated error signal being a binary error signal, wherein the generation of binary error signals further comprises
- recording at least one predetermined error generation model, and
- loading the model in read/write storage means so as to obtain a digital error generation signal by the reading of the storage means;
- forming a processed signal by introducing the error generation signal into an incident signal, wherein said incident signal comprises one of (A) the generated digital signal and (B) a multiplexed signal formed by multiplexing the generated digital signal with a signal received from a transmission terminal, thereby introducing errors into binary elements of the incident signal;
- and
- transmitting the processed signal to the reception terminal.
5 more elements
A method for the simulation of transmission on an asynchronous transfer mode transmission network, comprising:
- simulating the asynchronous transfer mode network, the simulating step further comprising the step of connecting a reception terminal to a simulator, said reception terminal being capable of receiving signals constituted of cells according to the asynchronous transfer mode format;
- generating a digital signal with a format and bit rate corresponding to a format and a bit rate which are standard for transmissions on the network, the generated digital signal being constituted by cells identifiable by a header;
- generating a signal representative of a simulated transmission error, the simulated error signal being a cell error signal wherein the generation of cell error signals further comprises
- recording at least one predetermined model of errors,
- loading the model into read/write storage means so as to obtain a digital error generation signal by the reading of these storage means, and
- generating erroneous cells;
- forming a processed signal by introducing the error signal into an incident signal, wherein said incident signal comprises one of (A) the generated digital signal and (B) a multiplexed signal formed by multiplexing the generated digital signal with a signal received from a transmission terminal, the forming step further comprising the step of replacing cells of the incident signal by erroneous signals as a function of the rate dictated by the error generation signal;
- and
- transmitting the processed signal to the reception terminal.
6 more elements
A method for the simulation of transmission on an asynchronous transfer mode transmission network, comprising:
- generating a digital signal with a format and bit rate corresponding to a format and a bit rate which are standard for transmissions on the network, the generated digital signal being constituted by cells identifiable by a header;
- generating a digital signal with a format and bit rate corresponding to a format and a bit rate which are standard for transmissions on the network, the generated digital signal being constituted by cells identifiable by a header;
- generating a signal representative of a simulated transmission error, the simulated error signal being cell jitter, wherein the generation of cell jitter further comprises
- memorizing a pre-established set-value model of jitter, and
- determining a delay between incident cells of an incident signal pertaining to one and the same communication;
- and
- forming a processed signal by introducing the error signal into the incident signal, wherein said incident signal comprises one of (A) the generated digital signal and (B) a multiplexed signal formed by multiplexing the generated digital signal with a signal received from a transmission terminal, the forming step further comprising the step of modifying as necessary the delay between cells of this same communication according to the set value;
- and
- transmitting the processed signal to the reception terminal.
6 more elements
A simulator of transmission on an asynchronous transfer mode transmission network, comprising:
- connection means for connecting a reception terminal to the simulator, said reception terminal being capable of receiving signals constituted by cells according to the asynchronous transfer mode,
- means for generating a digital signal with a format and bit rate corresponding to a format and a bit rate which are standard for transmissions on the network, the generated digital signal being constituted by cells identifiable by a header,
- means for generating a signal representative of a simulated transmission error, and
- control and processing means for forming a processed signal by introducing the error signal into an incident signal, wherein said incident signal comprises one of (A) the generated digital signal and (B) a multiplexed signal formed by multiplexing the generated digital signal with a signal received from a transmission terminal.
1 more element
A simulator of transmission on an asynchronous transfer mode transmission network, comprising:
- connection means for connecting a reception terminal to the simulator, said reception terminal being capable of receiving signals constituted by cells according to the asynchronous transfer mode,
- means for generating a digital signal with a format and bit rate corresponding to a format and a bit rate which are standard for transmissions on the network, the generated digital signal being constituted by cells identifiable by a header;
- means for generating a signal representative of a simulated transmission error, the error generation means comprising binary error generating means for generating binary errors;
- the binary error generation means further comprising
- a first storage device in which there is recorded at least one predetermined model of error generation,
- a second read/write storage device in which the predetermined model is loaded so as to obtain a digital error generation signal by reading the second storage device,
- control means for controlling reading and writing operations in the second storage device;
- and
- control and processing means for forming a processed signal by introducing the error signal into an incident signal, wherein said incident signal comprises one of (A) the generated digital signal and (B) a multiplexed signal formed by multiplexing the generated digital signal with a signal received from a transmission terminal.
6 more elements
A simulator of transmission on an asynchronous transfer mode transmission network, comprising:
- connection means for connecting a reception terminal to the simulator, said reception terminal being capable of receiving signals constituted by cells according to the asynchronous transfer mode,
- means for generating a digital signal with a format and bit rate corresponding to a format and a bit rate which are standard for transmissions on the network, the generated digital signal being constituted by cells identifiable by a header;
- means for generating a signal representative of a simulated transmission error, the error generation means comprising cell error generation means for generating cell errors, the cell error generation means further comprising
- a first storage device in which there is recorded at least one predetermined model of cell error generation,
- a second read/write storage device in which the predetermined model is loaded at the required moment so as to obtain a digital error generation signal by reading the second storage device,
- control means for controlling operations for the reading/writing of the second storage device;
- and
- control and processing means for forming a processed signal by introducing the error signal into an incident signal, wherein said incident signal comprises one of (A) the generated digital signal and (B) a multiplexed signal formed by multiplexing the generated digital signal with a signal received from a transmission terminal, said control and processing means further comprising cell error generation means for receiving the error generation signal and for generating cell errors in the incident signal as a function of the received digital signal.
5 more elements
A simulator according to 35, wherein the cell error generation means comprise a header recognition device, means for generating a replacement cell, and multiplexing means for making it possible, upon the command of the header recognition device, to replace an incident cell with a replacement cell.
A simulator of transmission on an asynchronous transfer mode transmission network, comprising:
- connection means for connecting a reception terminal to the simulator, said reception terminal being capable of receiving signals constituted by cells according to the asynchronous transfer mode;
- means for generating a digital signal with a format and bit rate corresponding to a format and a bit rate which are standard for transmissions on the network, the generated digital signal being constituted by cells identifiable by a header;
- means for generating a signal representative of a simulated transmission error, the generating means comprising means for the generation of jitter, the jitter generation means further comprising
- means for storing a set value of jitter established beforehand,
- means for measuring the delay between cells relating to one and the same communication,
- means for routing incident cells of an incident signal depending on whether or not they relate to the same communication;
- and
- control and processing means for forming a processed signal by introducing the error signal into the incident signal, wherein said incident signal comprises one of (A) the generated digital signal and (B) a multiplexed signal formed by multiplexing the generated digital signal with a signal received from a transmission terminal, the control and processing means further comprising control means for modifying as necessary the delay between the cells relating to one and the same communication.
5 more elements
A method of simulation comprising:
- simulating a connection of a transmission/reception terminal to an asynchronous transfer mode transmission network transmissions on which have a standard format and a standard bit rate,
- generating a digital signal which has a format and bit rate corresponding to the standards,
- generating a signal representative of a simulated transmission error which comprises one of a binary error, a cell error, and a jitter phenomenon, and
- forming a processed signal by introducing the error signal into an incident signal, wherein said incident signal comprises one of (A) the generated digital signal and (B) a multiplexed signal formed by multiplexing the generated digital signal with a signal received from the terminal.
1 more element
A simulator of transmission on an asynchronous transfer mode transmission network, comprising:
- connection means for simulating the connection of a transmission/reception terminal to the network,
- means for generating a digital signal with a format and bit rate corresponding to a format and a bit rate which are standard for transmissions on the network,
- means for generating a signal representative of a simulated transmission error which comprises one of a binary error, a cell error, and a jitter phenomenon, and
- control and processing means for forming a processed signal by introducing the error signal into an incident signal, wherein said incident signal comprises one of (A) the generated digital signal and (B) a multiplexed signal formed by multiplexing the generated digital signal with a signal received from the terminal.
1 more element
Dependencies are inferred from the claim text.