Widex USB LINK, User Instructions

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Quality of Service for Wireless Technology in the WidexLink System
WidexLink wireless technology enables communication between two partners of a binaural pair
of cLEAr hearing aids and with their matched external devices. The requirements for the quality
of service (QoS) vary among the various components and their intended user scenarios.
For programming, these requirements include a BEr (Bit Error rate) better than 10
-3
, at a bitrate
of 212 kbits/s, a semi-duplex transmission with a required acknowledge, a transmission latency in
each direction (2x) and a receive-to-transmit mode (rX to TX) time. The data are saved in the
hearing aid even when transmission is interrupted.
Wireless Security Measures
Security of the wireless signals is assured through device system design that includes:
• Individual mAc address for each unit which is checked during each transmission.
• A built-in pairing table which specifies valid and legitimate pairing among units
• A proprietary Widex communication protocol which checks the package numbers
during each transmission.
• A cyclic redundancy check (crc) to check data validity and correct errors,
• A secure Bluetooth connection that is pass-key protected
• Authorized usage of programming software with single log-in