Testing the performance of a communication line between two modems using modem processor
First Claim
1. Apparatus for quantitatively testing the performance of a communication line that carries customer data in both directions between two modems, said communication line carrying both customer data and a test command for controlling said testing, said apparatus comprisinga digital signal processor in each said modem coupled to said communication line for performing both digital modulation and demodulation of customer data carried on said line in accordance with a data program, and a series of quantitative tests of said line in accordance with a test program using test signal tones generated digitally, andin each said modem a programmable host processor separate from and coupled to said digital signal processor and responsive to said test command for selectively causing said digital signal processor to switch between performing said modulation and demodulation of customer data and said performing said series of quantitative tests.
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Accused Products
Abstract
Apparatus for testing the performance of a communication line that carries customer data between two modems, including a programmable processor (for example, a digital signal processor) in each modem that either performs modulation or demodulation of customer data or tests the line, and a controller (for example, a programmable host processor) that switches the programmable signal processor selectively between processing customer data and line testing. The communication line carries both customer data and network control commands that include a test command for initiating testing, and each host processor responds to the test command by switching the signal processor to the test mode. There are a plurality of modems forming a data network and a central network control system connected to the network for providing the test command. The test command names two of the modems to participate in the testing and the controller identifies whether a given modem is one of the participants. The controller causes all of the modems to cease processing customer data while the testing is in progress. The network carries progress signals while the testing is in progress. The controller causes all modems other than the two modems to monitor the network for the progress signals and to again process customer data when the progress signals cease to appear.
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Citations
21 Claims
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1. Apparatus for quantitatively testing the performance of a communication line that carries customer data in both directions between two modems, said communication line carrying both customer data and a test command for controlling said testing, said apparatus comprising
a digital signal processor in each said modem coupled to said communication line for performing both digital modulation and demodulation of customer data carried on said line in accordance with a data program, and a series of quantitative tests of said line in accordance with a test program using test signal tones generated digitally, and in each said modem a programmable host processor separate from and coupled to said digital signal processor and responsive to said test command for selectively causing said digital signal processor to switch between performing said modulation and demodulation of customer data and said performing said series of quantitative tests.
Specification