What is the downstream speed in GPON?
Downstream data goes over a 1490 nm signal, with a maximum speed of 2.488 gigabits per second. The upstream data uses the 1310 nm wavelength and can carry up to 1.244 Gb/second.
What is the downstream data rate of GPON technology?
2.488 Gbps
The GPON standard is defined in ITU-T G. 984. x [14]. The data rates for downstream and upstream are 2.488 Gbps and 1.244 Gbps, respectively.
Is the highest bandwidth for which a normal GPON can support?
GPON offers maximum flexibility because its 2.5-Gbits/sec bandwidth can be split up to 64 times to keep costs down. These buildings can be accessed by a single fiber that delivers high-bandwidth services for multiple customers over existing in-building copper using technologies such as VDSL2 and Ethernet.
What are DBA bandwidth types in the GPON system?
There are five DBA types: type1, type2, type3, type4, type5. T-CONTs are the physical resources of an ONT. A T-CONT can allocate a bandwidth only after it is bound to a DBA profile.
What is downstream in GPON?
In the GPON downstream transmission, the backbone optical fiber from the OLT GPON port is divided into N branch fibers through an 1:N optical splitter, and the data is transmitted to branch fibers in broadcast mode. Each branch fiber bears the same data as the backbone fiber.
What is upstream and downstream in GPON?
GPON utilizes both upstream and downstream data by means of Optical Wavelength Division Multiplexing (WDM). In downstream transmission, the lasers wavelength measures 1490 nm while the upstream wavelength measures 1550 nm. This transmission can reach up to 20 km starting from the central office running to the user.
What is the maximum channel attenuation for GPON Class B +?
984.1 (2008), Gigabit-capable passive optical networks (GPON): General characteristics. [ITU-T G. 984.3] Recommendation G. 984.3 (2014), Gigabit-capable passive optical networks (GPON): Transmission convergence layer specification.
What is DBA profile in GPON?
DBA (Database Bandwidth Assignment) is a mechanism in the GPON (Gigabit Passive Optical Network) network that plays the role of a maestro and, using bandwidth maps, distributes, synchronizes, and manages shared upstream bandwidth based on demand, fair distribution, and user bandwidth configurations.
What is the maximum differential fiber distance in GPON?
20 kms
In GPON, the maximum differential fiber distance is 20 kms. This affects the size of the ranging window and it is in accordance with ITU-T G. 983.1.
What is ONU in GPON?
An optical network unit (ONU) terminates the PON at the customer’s home. The ONU usually communicates with an optical network terminal (ONT), which may be a separate box that connects the PON to TV sets, telephones, computers, or a wireless router. The ONU/ONT may be one device.
What is good dBm for fiber?
Typical noise floors on fiber optic instruments using Si detectors is -70 to -90 dBm, or about 1 to 100 picowatts. Germanium detectors are sensitive to light in the 800 to 1800 nm wavelength, making them useful for all systems using glass fiber, including 1300 and 1550 nm single mode systems.