Telecommunications Telephone Terminal Equipment Transmission Requirements for Narrowband Voice over IP and Voice over PCM Digital Wireline Telephones
|Publication Date:||19 December 2000|
This standard establishes voice performance requirements for narrowband digital wireline telephones with codecs that conform to the ITU-T G-Series Recommendations and where transmission is in digital format. A telephone is defined as a device that terminates networks and provides telephony voice service. Transmission may be over Local Area Networks, Firewire/IEEE 1394, Universal Serial Bus (USB), public ISDN or digital over twisted pair wire. Applications include Voice over Internet Protocol (VoIP) and PCM-based telephones, whether connected through modems, gateways, or PBXs and personal computer-based telephones that may or may not have handsets.
Technical requirements are set for handset, headset and handsfree (speakerphone) modes of operation. Quality of Service is also addressed in Section 8. These requirements apply regardless of the technology used to couple the handset or headset to the telephone. Coupling may be by a cord, a short range air interface such as, but not limited to, a radio interface, an electric field interface, a magnetic field interface or an infra-red interface.
Limits of Applicability
These requirements are not intended to describe specific requirements for the following types of digital voice terminal equipment: telephones with carbon transmitters, ISDN terminal adapters and cellular voice terminals.
The loudness ratings in this standard intentionally differ from loss plan published in the PBX standard ANSI/TIA/EIA-464-B. At the time of approval of this standard, Project, PN-3673, was active to revise the ANSI/TIA/EIA-464-B loss plan to agree with this standard and extend its applicability to IP Gateways. Mixing digital telephone loudness ratings and PBX/Gateway loss plans may not provide optimum performance.
Categories of Criteria
Mandatory requirements are designated by the word "shall". Advisory requirements are designated by the word "should," or "may," or "desirable" which are used interchangeably in this standard. Advisory criteria represent product goals or are included in an effort to ensure universal product compatibility. Where both a mandatory and an advisory level are specified for the same criterion, the advisory level represents a goal currently identifiable as having distinct compatibility or performance advantages toward which future designs should strive.
FCC Part 68
This standard is intended to be in conformity with Part 68 of the Federal Communications Commission (FCC) Rules and Regulations, but is not limited to the scope of those rules. In the event that Part 68 requirements are more stringent than those contained in this standard, the provisions of Part 68 apply.
The telephone will also be subject to the applicable environmental conditions specified in EIA/TIA-571.
This standard does not contain safety requirements. Compliance with the applicable UL and CSA safety standards may be required in certain locations.