Arrangement for testing the transmission properties of subscriber line modules or digital terminal equipment of a communication system connectible thereto
First Claim
1. A test arrangement for testing the transmission characteristics of a plurality of units to be tested each including a subscriber line module which has a line interface unit or a digital terminal which has a digital terminal interface unit of a communication system connectible thereto, comprising:
- selection control means for selecting an initial condition for a unit under test and initializing the unit under test to the initial condition, said selection control means connecting an individual one of said subscriber line modules and said digital terminal interface units to said test arrangement;
a transmitting device for generating test pulses representing bits combined into bursts, said transmitting device including memory means storing characteristic curve shapes and jitter data for simulating specific cable types and lengths, reading means for reading said data from said memory means and digital-to-analog conversion means for converting the read data into test pulses for transmission to a selected unit under test;
receiving means connected to said transmitting device via the selected unit under test, said receiving means receiving the test pulses transmitted by said transmitting device to the selected unit under test and re-transmitted by said selected unit under test in forming a test loop, said receiving means being capable of being set to receiving characteristics of a subscriber line module when testing a digital terminal and of a digital terminal interface unit when testing a subscriber line module;
an evaluation device for comparing the test pulses transmitted by said transmitting device to the test pulses received by the receiving means;
a system bus; and
coupling means for coupling said transmitting device and said receiving means to an interface unit of a selected unit under test, a central microcomputer connected to said system bus and programmed to coordinate the operation of said transmitting device, said receiving means, said evaluation device and said selection control means.
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Abstract
Test pulses representing bits combined in bursts are generated, defined in form and amplitude, and jittered, defined by reading curve shaped characteristic data and jitter identification data from digital memories, for the purpose of simulating defined cable types and lengths and are transmitted to a unit to be tested. In a receiver, the test pulse is received and forwarded by the unit under test are accepted for the purpose of a test and are compared to the test pulses transmitted by the transmitter.
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Citations
18 Claims
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1. A test arrangement for testing the transmission characteristics of a plurality of units to be tested each including a subscriber line module which has a line interface unit or a digital terminal which has a digital terminal interface unit of a communication system connectible thereto, comprising:
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selection control means for selecting an initial condition for a unit under test and initializing the unit under test to the initial condition, said selection control means connecting an individual one of said subscriber line modules and said digital terminal interface units to said test arrangement; a transmitting device for generating test pulses representing bits combined into bursts, said transmitting device including memory means storing characteristic curve shapes and jitter data for simulating specific cable types and lengths, reading means for reading said data from said memory means and digital-to-analog conversion means for converting the read data into test pulses for transmission to a selected unit under test; receiving means connected to said transmitting device via the selected unit under test, said receiving means receiving the test pulses transmitted by said transmitting device to the selected unit under test and re-transmitted by said selected unit under test in forming a test loop, said receiving means being capable of being set to receiving characteristics of a subscriber line module when testing a digital terminal and of a digital terminal interface unit when testing a subscriber line module; an evaluation device for comparing the test pulses transmitted by said transmitting device to the test pulses received by the receiving means; a system bus; and coupling means for coupling said transmitting device and said receiving means to an interface unit of a selected unit under test, a central microcomputer connected to said system bus and programmed to coordinate the operation of said transmitting device, said receiving means, said evaluation device and said selection control means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification