What are the similarities and differences between fiber optic GPON and EPON?

Both GPON and EPON belong to passive optical networks and are widely used in FTTH. Nowadays, most households are connected to EPON and GPON, achieving the integration of telephone, broadband internet, and IPTV networks. A single fiber optic cable is used to solve the problem of making phone calls, accessing the internet, and watching TV.

In the early days, there were many EPONs, but now there are gradually more GPONs, and in the future, it will definitely be the domain of GPONs.

Comparison between PON and ADSL

Let's talk about PON and ADSL first

ADSL, those born in the 1980s and 1990s should have an impression. They use a telephone line to access the internet, then separate the voice signal from the broadband signal through a separator, and then dial up the internet through the PPPOE on the computer. This is related to the environment at that time, but telephone is the most popular.

The bandwidth provided by ADSL is much faster than that of a 56K cat, with an uplink speed of 1Mbps and a downlink speed of 8Mbps. This matches the environment at that time.

PON technology

With the development of technology, especially fiber optic technology, there is a demand for "three network integration", and the country requires operators to deploy fiber optic to households from a strategic perspective.

Around 2012, newly built properties were basically popularized with FTTH, and now older residential areas have also implemented FTTH, which uses PON technology.

PON technology has inherent advantages over ADSL and LAN access:

Can achieve high bandwidth

Due to the use of passive technology, there are no electronic products involved between OLT and ONU, resulting in a lower failure rate

Realized the integration of three networks

Compared to twisted pair cables, the cost of optical fiber is much lower

Due to these advantages, many enterprises are also deploying their own internal local area networks based on PON technology, called POL.

Comparison between EPON and GPON

EPON and GPON are two different PON standards.

EPON is a PON technology proposed by IEEE based on Ethernet.

GPON technology is a new technology based on ITU-TG.984. x.

The main differences between EPON and GPON are as follows:

GPON supports multiple transmission rates of uplink 1.25G and downlink 2.5G. EPON only supports 1.5G uplink and downlink.

The packaging efficiency of GPON is as high as 93%. The encapsulation efficiency of EPON is relatively low at around 60%.

GPON supports a spectral ratio of 1:64 or even 1:128. EPON supports a maximum spectral ratio of 1:32.