Isdn testing device and method

Details Isdn testing device and method Isdn testing device and method

H - Electricity

04

M

379/2

H04M 1/24 (2006.01) H04L 1/24 (2006.01) H04L 12/26 (2006.01) H04L 12/52 (2006.01) H04Q 11/04 (2006.01)

Patent

CA 2000503

A test device is 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 ah initial line connection test to determine if a satisfactory closed loop 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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