The 1*9 module is mainly used in PDH equipment. It is widely used in the end access of public communication networks, large customer access networks and private networks. SFP products are mainly used in switches and routers; they are widely used in backbone networks and metropolitan area networks. Analog products are mainly used in analog communications, especially CATV products. The specific application is as follows:
The entire network includes a Backbone Network/Long Haul, a Metro Network, an Access Network, and a Local Area Network.
Backbone network: mainly use DWDM technology to improve transmission bandwidth (2.5G ~ 10Tbps), metropolitan area network: important technologies are SONET/SDH, WDM and Ethernet, etc., the bandwidth per wavelength is about 2.5G->10Gbps LAN: Ethernet speed mainstream 1Gbps access network that has slowly moved from 100Mbps to fiber transmission: mainly CATV, HFC, FTTX, DSL, Wireless, Satelite and other technologies.