System, method and apparatus for testing long-distance frame time delay

Abstract

A method for testing time delay of remote frame can provide high accurate clock system to ensure high accurate clock and common time basis required by service time delay test of trans-regional communication network and to ensure long period of stability for clock system on each individual test instrument as well as to ensure clock accuracy required by user and used between multi-set test instrument when test of service time delay on tested communication network or tested communication device is carried out.

Description

technical field [0001] The invention relates to the communication field, in particular to a system, method and device for testing remote frame delay. Background technique [0002] With the wide application of communication equipment and communication services, in the field of communication equipment manufacturing and communication service operation, the precise measurement and evaluation of QoS (Quality of Service) and performance indicators (such as throughput) of communication equipment and communication networks have also become It is becoming more and more important, and the service delay (Service Delay) index is particularly critical for the rapidly growing voice and video services based on IP bearer. [0003] In the prior art, there are usually two technical solutions to test the service delay of the communication network: [0004] The first technical solution is to use the external reference clock access interface provided by the existing test instrument to access th...

AI Technical Summary

Problems solved by technology

The defect of this technical solution is: the use of commercial rubidium frequency standard and GPS frequency standard is expensive, which increases the test cost; and even if commercial devices such as rubidium frequency standard and GPS frequency standard are used, it still cannot solve The common clock reference problem when testing remote communication networks or communication equipment; in addition, this technical solution does not provide an integrated solution for testing and measurement, and the time delay of testing services requires network installation and calibration, which is cumbersome and time-consuming laborious

Although this technical solution relies on the Ethernet network to implement the clock synchronization protocol, the test frame carrying the time stamp cannot cross the three-layer switching network, so it cannot realize the long-distance delay test. The Qos test will be meaningless; in addition, IEEE.1588 technology is not yet mature in application at present, and realizing this technology requires a dedicated Ethernet PHY layer chip, and the Ethernet PHY layer chip supports the addition of synchronization information (Sync information) timestamps and extraction; but there is no mature application of IEEE.1588 commercial chip at present, and the clock synchronization protocol used when adopting this technical solution is relatively complicated, which brings considerable difficulties to the realization of this technical solution

[0006] From the above content, it can be seen that the existing technology is difficult to meet the requirements for testing the service delay of cross-regional and large-scale communication networks, even if the service delay is tested for communication networks or communication equipment in a small area, There are also problems such as high test cost, the need for network installation and calibration for each test task, which is cumbersome, time-consuming and labor-intensive, and complex communication protocols are difficult to implement.

Images