Precise Latency Measurement of Unidirectional-Data-Flow Network Equipment

Published

May 14, 2014

Author(s)

I-Chun Chao, Kang B. Lee, Frederick M. Proctor, Chien-Chung Shen, Fan-Ren Chang

Abstract

In regards to network performance measurements, many timing indices, such as latency, jitter, and one-way delay (OWD), are getting more attention because real-time applications and needs are pushing higher network capabilities. Data latency in a network can be measured by placing additional unidirectional-data-flow (UDF) devices, such as test access taps (TAPs), on the network path. However, this can create severe uncertainty to the timing measurement when sub-microsecond precision measurements need to be achieved. This paper proposes the Precision Time Protocol (PTP)-Based Measurement method for measuring latency of a UDF device based on traditional OWD measurements. In addition, we propose a Packet-by-Packet Precise Measurement method, which can further reduce the measurement uncertainty caused by the limit of precision in the PTP synchronization protocol in the PTP-Based Measurement method, by strictly calculating the latency for each packet.

Proceedings Title

2014 IEEE International Frequency Control Symposium

Conference Dates

May 19-22, 2014

Conference Location

Taipei, TW

Pub Type

Conferences

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DOI Link

Keywords

IEEE 1588, Latency Measurement, One Way Delay, Packet-by-Packet Precise Measurement Method, Precision Time Protocol, PTP, PTP-based Measurement Method

Citation

Chao, I. , Lee, K. , Proctor, F. , Shen, C. and Chang, F. (2014), Precise Latency Measurement of Unidirectional-Data-Flow Network Equipment, 2014 IEEE International Frequency Control Symposium, Taipei, TW, [online], https://doi.org/10.1109/FCS.2014.6859840 (Accessed October 14, 2024)