Operator triple play solution
The three-network convergence mainly refers to the convergence of services, and adopts a new network structure to meet the needs of three types of services including video, data and voice. The triple play of the broadcasting and TV operators can be realized based on the PON system. The principle is to integrate the PON system and the CATV system through WDM (Wavelength Division Multiplexing) technology to transmit 1550 nm, 1490 nm and 1310 nm signals through one optical fiber. The network structure topology is shown in Figure 1.
Figure 1 Schematic diagram of three-network convergence network structure
PON (Passive Optical Network) is a P2MP (point to multiple point) network system. It consists of three parts: OLT (Optical Link Terminal), ODN (Optical Distribution Network), and ONU (Optical Network Unit). At present, there are mainly EPON and GPON technical solutions.
The three-network convergence network adopts WDM technology to realize the same optical fiber transmission with the uplink and downlink optical signals of the PON system. Among them, the downlink signal is divided into two ways, one is the PON data signal, the optical wavelength is 1490nm; the other is the CATV broadcast signal, and the optical wavelength is 1550nm. The uplink signal is a PON data uplink signal with a wavelength of 1310 nm.
Triple play solution
The three-network convergence solution based on PON system shown in Figure 2:
Figure 2 Three-network convergence solution based on PON system
Description for pon and catv Figure 2:
G/epon olt receive the internet signal from the Internet, NGN, BAS or other servers, the catv source to the 1550nm optical transmitter, EDFA receive the internet from OLT and catv signal from 1550nm optical transmitter, EDFA internal and catv signal combine out.
Use a F-WDM, it receives 1310nm, 1490nm, 1550nm wavelength from EDFA, when out can divide the wavelength to 1310nm/1490nm (upc blue) and 1550nm (apc green)
(1) TV function in finally user
Use a FWDM connect to VR-860MM, then use stb can watch tv
(2) PC function
Use a FWDM connect to WK-3801 can internet
(3) Watch tv, wifi for phone, PC
EDFA out use PLC splitter connect WK-3804CW 4GE+CATV+WIFI, 4ports for internet, RF port for watch tv, two antennas wifi for phone
(4) TV only
Use VR-860MS active node 1550nm, use stb then can watch tv
(5) PC and phone or TV
Use a VR-860WMC with WDM, connect WK-3804W 4GE+WIFI can internet for pc and phone, use stb connect vr-860wmc can watch TV