Multiplex communications – Wide area network – Packet switching
Patent
1988-10-14
1991-01-29
Safourek, Benedict V.
Multiplex communications
Wide area network
Packet switching
3701101, 371 151, G06F 1120
Patent
active
049892029
ABSTRACT:
A test device and a method of testing are provided for an integrated services digital network (ISDN) system having a Network Terminator (NT), a system/terminal (S/T) interface for coupling the NT to a Terminal Equipment (TE), a transmit line between the S/T interface and the NT to permit a TE coupled to the S/T interface to transmit D channel and B channel information to the NT, and a receive line coupled between the NT and S/T interface to permit a TE coupled to the S/T interface to receive D channel and B channel information from the NT. The test device performs an initial line connection test to determine if a satisfactory line connection exists between the NT and the S/T interface connected by the transmit and receive lines by providing a predetermined signal to the NT from the test device and for evaluating a response from the NT to the predetermined signal. A satisfactory line connection between the S/T interface and the NT is indicated if the response from the NT is a predetermined response, while an unsatisfactory line connection is indicated if the response is not said predetermined response. A plurality of additional tests are performed after the initial line connection test to determine the location of a problem in said line connection if the initial line connection test indicates that the line connection between the S/T interface and the NT is unsatisfactory.
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Ehrke Wiley J.
Homkes Robert J.
Soto Roy L.
Harris Corporation
Hsu Alpus H.
Safourek Benedict V.
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