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As a next-generation enhanced GPON technology evolved from GPON technology standardized in ITU-T G.984, XGPON caters to the demand for high-bandwidth services. The figure below shows the network structure of XG-PON.
Combo PON adopts the new WDM1r technology to achieve optical wave splitting, and one device can meet the bandwidth requirements from high to low of different subscribers in a unified area. The self-adaptation of GPON & XG-PON is realized by inserting different optical modules into each PON port, which is the best choice for ISP companies under the current wave of network upgrades.
Advantages of XG-PON application:
Smooth evolution: All FiberHome OLTs in current networks support XG-PON service cards; therefore, users need not replace existing OLT equipment to provision the XG-PON service.
High bandwidth: 2.5 Gbit/s in the uplink direction and 10 Gbit/s in the downlink direction.
High split ratio: Provides a split ratio up to 1:256.
Shared ODN: XG-PON ONUs can be connected to the OLT equipment via an existing GPON ODN, based on the external wavelength division multiplexing (WDM) technology.
GPON & XG-PON Combo access: GPON and XG-PON ONUs can be connected to the same service card.
Smooth upgrade: XG-PON service cards can replace GPON service cards with little configuration change. Accordingly, services can be migrated smoothly.
Software and hardware compatibility: Bandwidth can be upgraded without replacing subracks. Various PON service cards can coexist in a subrack.
Clock and time synchronization with high precision: Uses the system time transfer protocol as defined in IEEE 802. 1 as supports synchronous Ethernet (SyncE), IEEE1588 V2, and 1PPS+ToD.
Overall protection: Supports backbone fiber protection (Type B) and all-fiber protection (Type C), with a switching time of no more than 50 ms.
Efficient data transmission: Encapsulates all the data to be transmitted into 125 us frames (fixed length frames) with a new GEM encapsulation structure, which uses fewer transmission overhead bytes and improves the transmission efficiency.
The transmission efficiency can reach 93% when the downlink rate is 10 Gbit/s or the uplink rate is 2.5 Gbit/s.
|Conforms to ITU-T G.987 series of standards, with good interoperability.
Tx: 2.488 Gbit/s
Rx: 1.244 Gbit/s
Tx: 9.953 Gbit/s
Rx: 2.488 Gbit/s
Tx: 1490 nm
Rx: 1310 nm
Tx: 1577 nm
Rx: 1270 nm
|Maximum transmission distance
|Maximum differential fiber distance
|Maximum split ratio
|Detection of optical power
|Supports RSSI detection.
|Detection of rogue ONUs
|Supports automatic detection and location of ONUs that constantly emit light.
|Supports various ONUs, such as SBU, SFU, MTU, cassette MDU, and MDU which can accommodate cards.
|Dynamically allocates bandwidth according to subscribers’ traffic status.
|Supports Type B, Type C, and Type C dual-homing protections.
|When the XG-PON system bears Ethernet services only and is fully configured with services (64 ONUs), the uplink throughput is no less than 1.9 Gbit/s, and the downlink throughput is no less than 8.5 Gbit/s.
|The uplink average transmission delay (when the traffic is no more than 90% of the system throughput) is less than 1.5 ms (packets of all sizes are counted).
|The downlink average transmission delay (when the traffic is no more than 90% of the system throughput) is less than 1 ms (packets of all sizes are counted).