TIA TIA-920.120-A PDF

This standard establishes transmission performance requirements for speakerphone devices that function as wideband digital wireline telephones. Group speakerphones that are commonly used in large conference rooms and with larger groups of people are outside the scope of this document. Transmission may be over any digital interface including Local or Wide Area Networks, Firewire/IEEE Std 1394, Universal Serial Bus (USB), public ISDN or digital over twisted pair wire. This includes TDM-based and packet-based (e.g. VoIP) transmission protocols. These telephones may be connected through modems, voice gateways, wireless access points, or PBXs, or they may be personal-computer-based telephones. Examples include, but are not limited to: ISDN telephones, digital proprietary telephones, VoIP telephones (corded and cordless), softphones running on personal computers, IEEE Std 802.11 telephones, USB telephony devices, DECT (CAT-iq) telephones, and Bluetooth® telephony devices.

The test measurement methods in this standard reference procedures in IEEE Std 269, IEEE Std 1329 and ITU-T Recommendations. Several performance measurement procedures are established, each of which yields standardized measurement data that may be used for the determination of compliance with this standard. Although this document may reference specific procedures or test equipment, the intent is not to be all-inclusive. Any measurement procedure and equipment that can result in an identical measurement is considered valid.

NOTE: If the main purpose for testing to this standard is comparison testing of different products, rather than compliance testing, then it is important that identical test procedures and equipment be used when testing the different products.

While the procedures may call out specific test points within the requirements, the full range of the requirements take precedence.