초록 ▼

A method for testing a digital data transmission line connected between two modems, including the steps of transmitting a test message from the first modem to the second modem, comparing the received message with the standard test message to determine errors, transmitting a test message back to the

A method for testing a digital data transmission line connected between two modems, including the steps of transmitting a test message from the first modem to the second modem, comparing the received message with the standard test message to determine errors, transmitting a test message back to the first modem along with the error message determined from comparing the received test message with the standard test message at the first modem. The error signal transmitted to the first modem and the error detected there is interpreted to determine the error in the transmission.

대표청구항 ▼

A method of testing a line for the transmission of digital data between two modems, wherein said method comprises the following steps: transmission of a predefined test message from the first modem selected as a starting-point of the test to the second modem located at the other end of the line to b

A method of testing a line for the transmission of digital data between two modems, wherein said method comprises the following steps: transmission of a predefined test message from the first modem selected as a starting-point of the test to the second modem located at the other end of the line to be tested; reception of said predefined test message by the end modem; comparison of the message received with the test message for determining information representing the existence or non-existence of transmission errors in the direction considered from starting-point modem to end modem or so-called forward-transmission error information; transmission by the end modem of the test message and of a second message containing the forward-transmission error information; reception of the two messages by the starting-point modem; comparison of the received test message with the test message itself, thus providing information representing the existence or non-existence of transmission errors in the direction considered from end modem to starting-point modem or so-called return-transmission error information; recognition of the forward-transmission error information starting from that portion of the messages received which corresponds to the second message.