HFC3000 Broadband Access System

Overview

HFC (hybird Fibre coax) network refers to the combination of optical fiber coaxial network, in China has a huge scale, is China's veritable "Bai." In the front end, the information enters the optical node and completes the main transmission part by the optical fiber, and the coaxial cable is used in the user access layer. Most of the new or re-built CATV networks use this structure, the system bandwidth of 750MHz or 860MHZ, can be extended to 1GHz, but the business situation is still basically analog television broadcast, and its potential broadband access advantage does not match.

Datang Telecom's HFC3000 broadband access system, it is in this form launched a broadband integrated information access system, can provide analog video, digital video, high-speed Internet and other integrated access business, which uses the latest technology, advanced modular design ideas, has a good integrated business access capabilities.

Networking mode

The HFC3000 broadband Access system effectively utilizes the existing CATV network resources, can provide users with convenient and diversified business, set video, data, voice as a whole, providing a high degree of integration of the end-to-end solution; The system is composed of the local equipment, optical node, integrated business unit and power supply node. The local terminal equipment is composed of CMTS, the upper frequency converter, the Ethernet switch, the server and the optical transmission unit compose, the optical Transmission Unit main function is completes the electro-optic conversion, is composed by the forward light emitting unit and the reverse light emitting unit, divides into the field type and the indoor type two kinds; Power supply and coaxial cable feed for field optical node equipment. Integrated service units are placed in the user's floor or the user's home, when placed in the user's floor with business convergence and distribution functions.

In the duplex mode, in the optical fiber segment using the same frequency of different fiber 1310mm wavelength region of the subcarrier modulation multiplexing mode transmission or use downlink 1550mm wavelength region, the Wave Division multiplexing mode in the uplink 1310mm wavelength region is transmitted, the Frequency division mode is used on the coaxial Access section and the downlink duplex mode, which supports the following frequency distribution:

　　

HFC3000 Broadband access system can be applied to the pure coaxial system or HFC system of intelligent residential district. As an access platform for various intelligent services in the community, it can also be applied to the integrated service access of CATV station. The general networking mode is as follows:

　　

System Configuration

HFC3000 Broadband Access System front-end system configuration and system design of the user capacity is closely related to, in general, the front end of each downlink data flow can accommodate 1,000 users, in full configuration when the front-end can provide 8 downlink data flow, that is, a front-end can support 8,000 users.

HFC3000 Broadband access system transmission distance of up to 160 kilometers, in the same shaft section is recommended to use less than 3 kilometers, generally 1 kilometers; optical transmission system is subject to 1310nm transmission power and loss, the general optical transmission distance is less than 50 kilometers.

For each downlink data stream, it is necessary to correspond to an upper frequency converter port. All the output signals of the upper frequency converter port, together with the TV signal from the TV front-end, are fed into the optical transmission system after mixing the mixer.

The integrated service unit is usually one for each user, and it can also be used for multi-user sharing.


Application Business

HFC3000 Broadband access system can support a variety of data, video, audio transmission services.

High-Speed Internet access
When used for high-speed Internet access, you can provide uplink 10.24Mbps (shared), downlink 42.8Mbps (shared) transmission rate.
Distance education, telemedicine
The video signal is converted into video data stream, sent in IP packet form, when the loan is wide enough to ensure the real-time transmission of video, so that people in different places at the same time in a "classroom" the effect of lectures, play a role in the virtual classroom. Similarly, telemedicine can also be achieved.
Conference TV
The system assigns a separate IP address to each user, allowing the meeting initiator to connect the attendees over the Internet. This business in the same front-end implementation has a good effect. When the service scope is large, the effect is not guaranteed.
Room Monitor
The user uses his password to connect to the monitored site by means of remote login via the Internet, and realizes the site real-time monitoring through the remote PC.

Large stock Room
The user through the CM30 and the stock market carries on the two-way transmission of data, carries on the big fry Room operation.
VOD Service
The user logs on to the remote video server and transmits the video signal to the user for real-time broadcast in the form of IP data stream.