Honda recently displayed the city-specific electric Urban EV concept car at the Frankfurt Motor Show. It is reported that at the Tokyo Motor Show to be held in late October this year, Honda will introduce the Sports Sports EV Concept concept car. Honda released a preview map of the Sports EV Concept concept car on Friday. The rear light design of this concept car is very similar to the Urban EV concept car.
Honda does not currently disclose more details of the Sports EV Concept concept car.
Honda has promised that the Urban EV concept car will be built for urban living. This concept car is equipped with a shiny Honda logo, as well as an external screen to display information or charge status. The seats are two consecutive rows and the interior is equipped with a variety of screens.
There are two types of EPON systems: one is a system that uses 2 wavelengths; the other is a system that uses 3 wavelengths.
For a two-wavelength system, its downlink wavelength is 1510 nm to transmit downlink voice, data and digital video services; the uplink wavelength is 1310nm to transmit uplink voice and video on-demand and download data request signals. The two-way transmission rate of this system is 1.25 Gb/s, even if the OBD split ratio is 32, it can transmit 20km.
For the three-wavelength system, in addition to the downlink wavelength of 1510 nm and the uplink wavelength of 1310 nm, a transmission window with a downlink wavelength of 1550 nm (1530 ~ 1565 nm) is added. The new window is used to transmit downlink CATV service or DWDM service. The CATV service can be either an analog video signal or an MPEG-2 digital video signal. When the splitting ratio of this system is 32, it can transmit 18 km.
EPON is located between the business network interface and the user network interface, connected to the business node through SNI, and connected to user equipment through UNI. EPON system is mainly composed of optical line terminal (OLT), optical distribution network (ODN) and optical network unit.
In the EPON system, the OLT is not only a switch or router, but also a multi-service providing platform, which provides optical fiber interfaces for passive optical fiber networks. According to the development trend of Ethernet to metropolitan area network and wide area network, OLT will provide 1 Gb/s and 10 Gb/s Ethernet interfaces. In addition to supporting traditional voice, ordinary telephone lines, and other types of T1/E1 interfaces, the OLT also supports SONET connections at ATM, FR, and OC3/12/48/192 rates. The OLT in the EPON can be configured with multiple optical line cards as required to connect with 16 to 64 ONUs. In EPON, the maximum distance from the OLT to the ONU can reach 20 km. If an optical fiber amplifier (active repeater) is used, the distance can be extended.
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