IEEE 455-1976
IEEE Standard Test Procedure for Measuring Longitudinal Balance of Telephone Equipment Operating in the Voice Band
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About This Item
IEEE 455-1976 is a technical standard for measuring longitudinal balance in telephone equipment operating in the voice band. It addresses a key performance parameter for communication hardware, helping engineers evaluate how well equipment rejects unwanted common-mode interference. For voice-band systems, this measurement can be important to consistent transmission quality, reduced noise susceptibility, and predictable behavior in installed networks. IEEE 455-1976 is especially relevant when comparing designs or verifying performance against a defined test procedure.
About IEEE 455-1976
This standard sets out a test procedure focused on longitudinal balance, a measurement used in telephony and related communication equipment to assess balance between conductors and the equipment’s response to external interference. IEEE 455-1976 provides a structured way to evaluate voice-band telephone devices in a repeatable manner, supporting engineering analysis and technical comparison. In practice, the document is useful where signal integrity, circuit balance, and interference rejection are part of product qualification or design review.
Where is IEEE 455-1976 used?
IEEE 455-1976 is used in the testing and evaluation of telephone equipment intended to operate in the voice band, including line interfaces, terminal devices, and other communication components where longitudinal balance is a relevant characteristic. It is commonly applied in laboratory measurement workflows, product development, and verification of telephony-related hardware. The standard can also support procurement or acceptance checks when consistent electrical performance and interference tolerance are important to system behavior.
Importance in practice
In practice, IEEE 455-1976 helps establish a consistent basis for measuring a parameter that affects noise immunity and transmission quality in voice-band telephone equipment. Using a defined procedure reduces ambiguity in test results and makes it easier to compare products or revisions over time. IEEE 455-1976 can support design control, compliance-oriented testing, and risk reduction by giving engineers a repeatable method for checking longitudinal balance before equipment is deployed or approved.
- Voice-band telephone equipment
- Longitudinal balance measurement
- Common-mode interference rejection
- Laboratory test procedure
- Design and verification support
- Publication Date: 1976
- Standard Status: Superseded
- Publisher: IEEE
- Subject: Communication, Networking and Broadcast Technologies; Components, Circuits, Devices and Systems; Signal Processing and Analysis
- Official IEEE: Doi link
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