Digital service unit

H - Electricity – 04 – M

Patent

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379/2

H04M 3/22 (2006.01) H04M 3/24 (2006.01) H04Q 11/04 (2006.01)

Patent

CA 2011385

ABSTRACT This invention relates to a network termination equip- ment including circuitry for transmitting signals back for loopback test and is characterized in that it can test all the functions of the unit by executing the loopback test only after having verified the normal operation of the circuits related to a call origination.

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