CATV function introduction

CATV interface

The full name of CATV is Community Antenna Television, literally translated as community public television antenna system. In China, it generally refers to the broadcasting and television cable system, or the broadcasting and television cable television network. The CATV interface is actually RF OUT connected to the radio frequency port (export). CATV signal transmission process:

  1. First, the CATV server converts the radio and television program signals into optical signals, and transmits them to the ONU through 1550nm wavelength light.
  2. After the ONU’s PON port receives the 1550nm optical signal, it converts the 1550nm wavelength light sent by the CATV server into the analog electrical signal of the TV on the CATV chip module.
  3. The CATV interface (RF OUT) of the ONU is sent to the set-top box, and the set-top box decodes the video electrical signal, transmits it to the display through the HDMI cable, and outputs the picture and sound

CATV function introduction





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Many users may have the question: are ONU and ONT the same thing? So, do you know the difference between ONU and ONT? ONU means Optical Network Unit and ONT means Optical Network Terminal.

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An optical line terminal, abbreviated as OLT, is an important end-point device that can be connected to the front-end (transmission convergence layer) switch with a network cable and can be converted into optical signals.

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EPON and GPON have different data protocols. EPON is an Ethernet-based IEEE standard. It supports packet-based transmission at a speed of 1 Gbps or 10 Gbps. GPON adopts SONET/SDH technology and General Framing Protocol (GFP) to transport Ethernet.

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The uplink and downlink rates of xPON are both higher than those of GPON. As is known to all, each PON port can connect up to 128 ONT. xPON supports data rates up to 10 Gbps per PON port, while GPON supports 2.4 Gbps.

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