Some site overseas builds one MAN with NE40 and attaches users through DSLAM. After the service is enabled, users cannot play IPTV program of some ISP. PC can access network, download, play CCTV through DSLAM, but IPTV program of ISP cannot be played. Change PC as STB and play it with TV. IPTV program of ISP can be played.
Default player of PC is REALPLAY. Use Media player and other players, it cannot be played. Install VLC and it is normal. CCTV uses MPEG2 format and the program source of ISP is MPEG4 format. REALPLAY cannot support MPEG4, the program cannot be played.
It can access network and downloas, MAN and access can be ironed out. CCTV on-demand is normal and the support of video service can be ironed out. Change it as STB and it can be played. ISP website is not problematic. There is problem of PC.