| Technology |
EPON |
GPON |
| Standardization Organization |
IEEE EFM |
ITU-T/FSAN |
| Standard |
IEEE 802.3ah |
ITU-T G.984 |
| Transport Layer Protocol |
IP/Ethernet |
ATM/GEM |
| Downstream Multiplexing Technique |
TDM |
TDM |
| Upstream Multiplexing Technique |
TDMA |
TDMA |
| Data Service Bearing Mode |
Ethernet |
GEM |
| Max. Transmission Distance (km) |
10, 20 |
20 |
| Max. Downstream Speed |
1.25Gbit/s |
2.5Gbit/s |
| Max. Upstream Speed |
1.25Gbit/s |
1.25Gbit/s |
| Splitting Raito |
1:16, 1:32, 1:64 |
1:16, 1:32, 1:64, 1:128 |
| ONU Interface |
10/100/1000M Ethernet Interface |
ATM, TDM and 10/100/1000M Ethernet Interface |
| OLT Service Node Interface |
1G and 10G Ethernet Interface |
ATM，TDM and 1G and 10G Ethernet Interface |
| Upgrade Difficulty |
normal |
normal |
| User Network Cost |
low |
higher |
| Service Node Cost |
low |
higher |
