Motorola Solutions, Inc.

Tellabs Operations, Inc.

Robert L Torstensson

Terrence J Tanis

Brian L Yarger

Satish K Jena

An apparatus and method are provided for detecting radio accessories within a communication system formed of a radio, a primary accessory and a secondary accessory. The secondary accessory comprises a resistor network which switchably couples parallel resistors in response to a bias input generated from either a microphone bias voltage or speaker bias voltage of the primary accessory. Various parallel combinations of the resistors indicate the secondary accessory type. Control logic in the primary accessory determines the type of secondary accessory by comparing digital signals representative of the current sourced through the resistor network () to predetermined values stored in look-up table. The utilization of the microphone bias and/or speaker bias of the primary accessory advantageously negates the need for any additional pins or complex circuitry at the primary accessory.

Apparatus and method for detecting radio accessories

A system and method for autonomous data path verification in a multi-module shelf configuration, such as in a digital cross-connect system, are disclosed. The system generally includes a source port module, a destination module, and optional n-stage network of mapping interface modules. The source port module is configured to reuse transport overhead bytes of received SONET or SDH signals by inserting data path verification data therefor. The destination module is configured to perform autonomous data path verification between the source port module and the destination module by examining the reused transport overhead bytes of the signals received from the source port module. The method generally includes reusing transport overhead bytes by inserting data path verification data into the overhead bytes of signals received by a first module, e.g., a source port module, and transmitting the signals with the data path verification data toward a second module, e.g., a destination port module. The second module emits a confirmed or unconfirmed pattern upon detecting presence or absence of an expected pattern in the reused transport overhead bytes, respectively, and reports changes in the received pattern to facilitate autonomous data path verification.

Growing community of inventors

Rolling Meadows, IL, United States of America

Robert L Torstensson