Huahuan Electronics HX.PTP-GM02, User Manual

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Beijing Huahuan Electronics Co., Ltd
within sub-µs accuracy, and provides timing reference to various application
systems. Supported protocols include IEEE-1588V2, 1PPS+ToD, and Stratum-1
NTP server.
2.1. IEEE-1588V2 Grandmaster Clock
In the fields of telecommunications, electrical networks, measurement
instruments, and industrial automation, time synchronization and/or frequency
syntonization among individual nodes are key enablers for the normal functioning
of the connected systems. In the past couple of decades, such system connections
are quickly evolving from previous generations of diverse networking
technologies into Ethernets. While a unified Ethernet networking technology
improves a lot of aspects of the applications, one particular property of current
Ethernet systems, namely timing opaqueness resulting from packet delay
variations and asynchronous physical links, needs to be dealt with to achieve sub-
µs synchronization. IEEE-1588 precision timing protocol was specifically
designed for high precision synchronization over packet based networks,
especially Ethernet networks.
In a PTP timing domain, one or several backup grandmaster clocks are
needed to provide necessary timing reference. Since the requirements for timing
differ in different industries, each industry specifies a separate profile based on
the overall standard of the IEEE-1588V2. For example, in telecommunications,
ITU-T G.8265.1 and G.8275.1 specify respectively network syntonization and
synchronization profiles. Grandmaster clocks compliant to these profile standards
are called telecom grandmasters, or T-GM.
Supported by hardware and software code sign, the HX.PTP-GM02 can
operate under a set of pre-defined profiles, so that it can be readily used as a GM
in a number of applications. Its usage is exemplified in the following pages,
where a GeckoSynco provides timing reference for enterprise smallcells in 4G/5G
mobile networks.
HX.PTP-GM02 IEEE-1588 Grandmaster Clock V1.0 3