Telefonaktiebolaget Lm Ericsson (publ)

Jonas Gustafsson Rosenberg

Fredrik Lindqvist

Antoni Fertner

Per Ola Börjesson

Per Ödling

Axel Frank Jensen

Adam Wiå

The invention refers to single-ended test of a loop with the aid of a transceiver, wherein an input impedance (Z(&#x192;)) of the loop is generated. The transceiver has a digital part, a codec and an analog part and is connected to the loop. With the aid of a transmitted and a reflected broadband signal (v, v) an echo transfer function H(&#x192;)=V(f)/V(f) is generated, which also can be expressed as Here Z(&#x192;), Z(&#x192;) and H(&#x192;) are model values for the transceiver. In a calibration process a test transceiver, with the same type of hardware as the transceiver, is connected to known impedances, replacing the loop. H(&#x192;)=V(f)/V(f) is generated for the known impedances and the model values are generated and are stored in a memory in the transceiver. The stored model values are then used when the input impedance (Z(&#x192;)) for the loop is generated after a measurement of the broadband signal (V, v) is performed.

Growing community of inventors

Stockholm, Sweden

Jonas Gustafsson Rosenberg