Method and apparatus for performing transmission line testing
First Claim
1. A method for measuring a certain parameter of a voice transmission line including an echo cancellation device, the voice transmission line including a terminating device and an originating device being capable of establishing a data communicative relationship by exchanging data over the voice transmission line, the echo cancellation device being capable of acquiring an enabled mode and a disabled mode, in the enabled mode the echo cancellation device performing echo cancellation on the voice transmission line, in the disabled mode the echo cancellation device being responsive to the terminating device and the originating device co-acquiring first and second signal conditions, respectively, to acquire the enabled mode, the terminating device manifesting a predetermined pattern of signal variations that includes the first signal condition, said method comprising:
- observing the predetermined pattern of signal variations manifested by the terminating device;
establishing at the originating device the second signal condition at a point in time whereby the first and second signal conditions occur over a common time period, such that the echo cancellation device acquires the enabled mode;
applying a signal to the transmission line to measure the certain parameter.
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Accused Products
Abstract
A method and apparatus for testing and measuring transmission line parameters, such as the post-dial delay, the line rate, the noise level and the signal level, among others. The method comprises the step of enabling an echo canceler present in the transmission line and afterwards measuring the parameters of the line.
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Citations
14 Claims
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1. A method for measuring a certain parameter of a voice transmission line including an echo cancellation device, the voice transmission line including a terminating device and an originating device being capable of establishing a data communicative relationship by exchanging data over the voice transmission line, the echo cancellation device being capable of acquiring an enabled mode and a disabled mode, in the enabled mode the echo cancellation device performing echo cancellation on the voice transmission line, in the disabled mode the echo cancellation device being responsive to the terminating device and the originating device co-acquiring first and second signal conditions, respectively, to acquire the enabled mode, the terminating device manifesting a predetermined pattern of signal variations that includes the first signal condition, said method comprising:
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observing the predetermined pattern of signal variations manifested by the terminating device;
establishing at the originating device the second signal condition at a point in time whereby the first and second signal conditions occur over a common time period, such that the echo cancellation device acquires the enabled mode;
applying a signal to the transmission line to measure the certain parameter. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A measuring device for measuring a certain parameter of a voice transmission line including an echo canceler and a terminating device, the terminating device and said measuring device being capable of establishing a data communicative relationship by exchanging data over the voice transmission line, the echo canceler being capable of acquiring an enabled mode and a disabled mode, in the enabled mode the echo canceler performing echo cancellation on the voice transmission line, when in the disabled mode, the echo canceler being responsive to the terminating device and said measuring device co-acquiring first and second signal conditions, respectively to acquire the enabled mode, the terminating device manifesting a predetermined pattern of signal variations that includes the first signal condition, said measuring device including a signal processing unit coupled to the transmission line and being operative for:
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observing said predetermined pattern of signal variations manifested by said terminating device and for establishing on the transmission line said second signal condition at a point in time such that the first and second signal conditions occur over a common time period, such that the echo canceler acquires the enabled mode; and
measuring the certain parameter. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification