Hello,
Today, I will share with you a comparison of the technical advantages of the four synchronization methods
Wireless standard
| Clock frequency accuracy requirements | Clock phase synchronization requirements |
GSM | 0.05ppm | NA |
WCDMA | 0.05ppm | NA |
TD-SCDMA | 0.05ppm | +/-1.5us |
CDMA2000 | 0.05ppm | +/-3us |
WiMax FDD | 0.05ppm | NA |
WiMax TDD | 0.05ppm | +/-0.5us |
LTE FDD | 0.05ppm | NA |
LTE TDD | 0.05ppm | +/-1.5us |
Synchronization technology | Technical characteristics | Advantage | Limitation |
Physical layer synchronization | Using the Ethernet physical layer synchronization technology, the complete synchronization of the packet network is finally achieved | Clock synchronization quality is close to SDH
Not affected by PSN network
The system clock architecture is similar to the SDH solution, and the implementation technology is relatively mature | Requires network-wide deployment Not all Ethernet interfaces can recover the clock Does not support time synchronization |
1588V2 | PTP (Precision Clock Synchronization Protocol), which uses protocol messages to transfer synchronization information, can be used for synchronization in the fields of telecommunications, measurement and industrial control | Can achieve time synchronization
Clock accuracy is sub-us level, wide application range
Protocol auto-negotiation, no configuration | Requires network-wide device support, must be deployed across the network New technology, requiring hardware support, more complex protocols, and higher deployment costs |
1588ACR | Put the local clock (timing) information in a packet according to a certain encapsulation format and send it to the receiver to recover the clock from the packet. Through the algorithm and the encapsulation format, try to avoid the damage caused by the PSN transmission process. | Support PSN network transparent transmission, do not require intermediate equipment to support 1588ACR, flexible application
Vendor chip support is better, and our company also has related technology development to achieve more mature technology | The quality of the recovered clock depends on the bearer PSN network. It is greatly affected by network delay jitter, packet loss, and out-of-sequence. It is necessary to ensure high QoS of the service. Does not support time synchronization |
NTP | NTP (Network Time Protocol), clock timing is similar to 1588, widely used in Internet network timing | Can synchronize frequency and time simultaneously | The clock precision is ms level, which cannot meet the requirements of 3G telecommunication network |
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