Installing the i2050 Software Phone 31Internet Phone User Guide Nortel NetworksStep 2: Install the USB Audio HeadsetOverview of USB Audio KitOperation of the i2050 Software Phone requires the use of the Nortel NetworksUSB Audio Kit.The USB Audio Kit provides a high quality predictable audio interface which ishighly optimized for telephony applications. The USB Audio kit allows the i2050Software Phone to have an absolute and predictable loss and level planimplementation which is necessary to meet TIA-810, FCC part 68 and itsinternational equivalents as well as the ADA requirements for the hearingimpaired. With the USB Audio kit, the i2050 can achieve performance rivaling orsurpassing that of hardware telephones.The USB Audio Kit is fully compliant with version 1.1 of the USB DeviceSpecification and Windows Plug & Play specifications. It is fully compatible withthe suspend and resume functions for effective use in battery operated laptops. Itis functional on Windows 2000 Professional, Windows 98, Windows 98 SecondEdition, and Windows Millennium. No drivers or software are required forinstallation.In the box• USB Headset Adapter• Installation Guide (English and French)• USB cord• Telephony grade monaural headset• Lower cordset with quick disconnectConnectors• RJ-9 headset/handset jack• Accessory jack for “in-use”lamp• USB device jackSpecifications• Native Audio format: 16 bit linear 8 KHz over USB, limited to 8 bit PCMlogarithmic coding in hardware• OS Compatibility: Windows 98, 98SE, 2000, ME• Power Source: USB power provided from computer• Enumeration: Enumerates as USB Composite Device and USB Audio Device• Channels: Mandatory control channel for enumeration, bi-directionalisochronous channel for audio• Electret Microphone Bias: 3 V• Maximum SPL Protection: limited in headset• In-Use Lamp Connector: Isolated contact closure - polarity insensitive