Low-latency 10G PON solution, helping PON technology to be applied in new parks

“PON technology has become the mainstream technology of home broadband, and more and more applications are applied to enterprise private lines. In addition, because of its simple two-level all-optical architecture, PON has also been widely used in enterprise campuses and industrial control. With the emerging campus applications represented by high-definition video conferencing, intelligent security, mobile office, and low-latency industrial production control, users’ requirements for high-bandwidth and low-latency PON technology are becoming higher and higher, and PON technology is undergoing upgrades. with replacement. At present, domestic mainstream operators are upgrading GPON to 10G PON technology to meet the application requirements of high bandwidth.However, the industry is concerned about how to meet the needs of high-end government and enterprises

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PON technology has become the mainstream technology of home broadband, and more and more applications are applied to enterprise private lines. In addition, because of its simple two-level all-optical architecture, PON has also been widely used in enterprise campuses and industrial control. With the emerging campus applications represented by high-definition video conferencing, intelligent security, mobile office, and low-latency industrial production control, users’ requirements for high-bandwidth and low-latency PON technology are becoming higher and higher, and PON technology is undergoing upgrades. with replacement. At present, domestic mainstream operators are upgrading GPON to 10G PON technology to meet the application requirements of high bandwidth. However, the industry is still discussing how to meet the technical needs of high-end government and enterprise users and low-latency scenarios such as industrial production control.

The PON technology adopts the upstream TDM working mode. In order to discover the newly connected or newly powered ONU in time, the OLT PON port side needs to open the window regularly (for example, every 1~10 seconds), so that the new ONU can complete the required access to the OLT. registration, ranging and other processes. During the windowing period, all ONUs in normal working state suspend sending uplink data. According to the standard, the window opening period is 250 microseconds, which brings a delay of 250 microseconds to the ONU. In order to eliminate the delay caused by the PON window registration mechanism, ZTE has innovatively launched a low-latency 10G PON solution based on its years of accumulation in the field of PON technology, following the first proposal and release of the Combo PON solution.

The low-latency 10G PON solution, as shown in the figure below, uses a Combo PON of GPON & 10G PON on the OLT side, and a low-latency ONU on the ONU side. This solution moves the control and management functions such as ranging and windowing from the 10G PON channel to the GPON channel, and the 10GPON channel delay can be reduced to less than 100 microseconds.

This solution can directly use the Combo PON OLT equipment that has been widely deployed, and the ODN network can also remain unchanged, so it has good inheritance. The introduction of low-latency ONUs can help operators quickly provide low-latency services.

Low-latency PON can well meet the needs of the following scenarios.

(1) Enterprise private line: On the basis of 10G PON improving large bandwidth private line for enterprises, the delay is further reduced from millisecond level to microsecond level, realizing “high-quality private line”.

(2) Industrial park: realize the all-optical green park network of fiber-to-machine, fiber-to-meeting room, and fiber-to-office in the industrial park. Low-latency PON solves the delay problem of industrial PON and can meet the low-latency requirements of industrial control.

As the initiator of the Combo PON technical solution for GPON & 10G PON, ZTE has further innovated and proposed a low-latency PON solution on the basis of Combo PON, further expanding the application field of PON to application scenarios with stringent requirements on latency, including enterprise Private line, and industrial PON and other fields.