The EoC access technology is never out: Baseband EoC

“The baseband is defined as a transmission signal that contains more than just a single frequency from 0 Hz to the highest frequency component.”

What does the Baseband EoC look like?

  The baseband EoC does not change the frame format of the original Ethernet signal, but only converts bipolar (differential) signals that are convenient for the Category 5 transmission to unipolar signals that facilitate transmission over the coaxial cable. The baseband EoC technology uses frequency division multiplexing technology to mix Ethernet data signals and cable TV signals on the same coaxial cable for transmission. The CATV signal is transmitted in the frequency band above 87MHz, and the Ethernet signal is transmitted in the frequency band below 45MHz. The two signals are transmitted in a common cable, and the working frequency band is different, which does not affect each other.

Baseband EoC technology principle (draft version)

  The principle of baseband EoC technology is shown in above draft technology diagram. It is mainly implemented by two-four-transform and high/low-pass filtering. Due to the use of baseband transmission, there is no need for modulation and demodulation technology. Both the corridor end and client end equipment are passive devices. Because the existing Ethernet technology is to receive and send two pairs of lines, and the coaxial cable is only logically equivalent to a pair of lines, so the passive filter needs to be converted from four lines to two lines.

Features of the baseband EoC technology

  The main features of the baseband EoC technology are as follows:

  • Ethernet signals is transmitted by baseband channel;
  • The original Ethernet signal’s frame format and MAC layer have not changed and are still based on a series of IEEE 802.3-related protocols;
  • Ethernet signals are converted from bipolar (differential) signals transmitted in twisted pair to unipolar signals for transmission over coaxial cables;
  • Its greatest feature is that it can be realized through passive processing.

Baseband EoC application

  The baseband EoC technology transmits baseband 10Base-T Ethernet signals while transmitting standard CATV signals. Using the HFC network, there is already an in-home coaxial cable. The Ethernet data service and the cable TV signal are directly transmitted to the user end, and the passive separation of the mixed signal is realized at the user end. EoC transmission consists of central office equipment and customer premises equipment. The central office equipment is responsible for the exchange of data signals and the mixing of television signals, and the separation of mixed signals at the customer premises equipment. The application diagram following is a schematic diagram of user access using EoC, in which the central office equipment in the building completes the exchange of data signals and the mixing of television signals, and can retain the original centralized distributor in the building and then connect to the central office equipment. The central office equipment integrates the functions of the distributor and completely replaces the existing centralized distributor. The socket inside the home provides RJ-45 interface and CATV interface at the same time, realize the separation of mixed signal.

Baseband EoC application in the last 100m access

The EoC access technology is never out

  The advantages of the baseband EoC technology are low cost per line, more manufacturers, and a certain size of applications in the world. Plug and play can be achieved without complex debugging on the client.

  And due to the use of passive devices, the network operates more stable and safe, and maintenance costs are also lower. The disadvantage is that it can not be distributed through the branch distributor. It only supports the peer-to-peer star-shaped distribution network. The bandwidth of each line is a fixed 10 mbps. It must be put into place once during the transformation and the rolling investment cannot be realized.

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