Looking Fusion: DSL in the EPON Application of-DSL, EPON-communications industry
EPON + DSL this new network model is evolving in new business, increasing bandwidth requirements, and the "Light of Copper" and made the background, use this networking model to meet user needs, save operators invest to ensure proceeds. But to make this networking model into the mainstream, operators in the equipment is compatible, the product is rich in experience, and many other aspects of operation and maintenance still requires effort.
Domestic Internet access method to technology-based DSL to LAN, WLAN and other technologies as a necessary complement, but the current pattern of broadband access network is facing serious challenges:
Copper prices are rising, making operators "last mile" of the input increases, fiber prices continue to fall; emerging new services such as video services such as the increasing demand for bandwidth; ADSL transmission rate by the transmission distance great effect, not suitable for long distance transmission.
View of the above factors, operators urgently need to adopt new technology to improve the present situation, while EPON and DSL combined model on these issues made a very good solution. China Telecom EPON 2005, starting from the test, and now its EPON system in the technology, products and networking mode, both have matured to a commercial level.
Integration of network technology tend to
ADSL technology is very mature, and ADSL2 + technology, the large extent to improve the use of the bandwidth of broadband users (ADSL equipment to provide for the DSLAM).
EPON technology after years of China Telecom testing, selection and testing of network roll-out, are already quite mature, and able to provide 1Gbit / s symmetrical downstream and upstream speed, for a variety of high bandwidth video services are able to meet.
DSL and EPON both technologies have their respective advantages, better integration of networking potential.
EPON networks, OLT uplink authentication server authentication account for individual customers, down through the splitter, ONU and the DSLAM equipment and home computer users connected to the ONU from the central office all the way with optical access, protection of users privacy, transmission reliability. The program is different depending on the device integration can be divided into the following two cases.
1. ONU and the DSLAM separation
Such applications in the way, ONU and the DSLAM is the separation of two devices, the advantages are as follows:
DSLAM products mature, high integration, multiple users can provide a stable broadband access; ONU and the DSLAM can be installed in different rooms, the requirements of the engine room lower than the traditional model.
2. ONU and the DSLAM integration
Such applications in the way, ONU and the DSLAM is a device, its advantages are as follows:
Integrated devices are small, the requirements on the installation environment is very low; to provide voice and data export to solve the problem the user full service access; to nearest location from the user to install, reducing copper distance and improve access bandwidth.
ONU and the DSLAM separate scenarios
ONU and the DSLAM access mode separation shown in Figure 1.
This mode, the central office is set to: OLT through the optical port or the FE interface with authentication server, through the optical fiber link under ODN (splitter), according to the different capacities, each OLT can be linked to more than under the ODN devices. The client is set to: Community room operators to be built within the ODN, ONU, and a total of three kinds of DSLAM equipment, ODN is a splitter, according to distances and other support 1:16,1:32 and 1:64 splitting ratio, more are currently using 1:32 of the beam splitter, passed between splitter and ONU Pixian Cable Connection, and then turn into a FE interface ONU link under the DSLAM equipment, DSLAM equipment, and computer directly connected to ADSL lines.
Advantage of the model is: DSLAM down greatly reducing the copper access distance and improve the bandwidth large bandwidth for future applications possible; DSLAM equipment, mature and able to provide hundreds of customer access income.
Disadvantages are: operators need to access the same manner as traditional building room, and the model room temperature, humidity and load-bearing requirements such as the same as the traditional machine room.
Application of the model are: the local fixed network operators leading the transformation of the existing district; new residential broadband network access.
ONU and DSLAM integrated scenarios The access pattern shown in Figure 2.
This access mode, the central office of the OLT through the optical port or the FE interface with authentication server, through the optical fiber link under ODN (splitter), according to the different capacities, each OLT can be linked to more than under the ODN devices.
The client, the engine room operators in the district to be built three kinds of equipment that ODN, ONU and the DSLAM. ODN is a splitter, according to distances and other support 1:16,1:32 and 1:64 splitting ratio, is currently using more of the splitter 1:32, ODN is a passive device, and small size, no special room, can be placed anywhere inside the building, such as shafts and other places. Splitter and ONU connection between the cable through the Pi Xian, integrated DSLAM functionality ONU can provide two kinds of voice and ADSL services.
Advantage of the access mode: DSLAM down greatly reducing the copper access distance and improve the bandwidth large bandwidth for future applications possible; do not need a standard telecommunications room, ODN and ONU can installed in the shaft, the installation of a flexible, cost; ONU module with integrated voice and DSLAM, can provide two kinds of voice and Internet services.
The disadvantages are: the type of the current ONU is not rich, but to support dozens of users to access, and compatibility with the manufacturers for further testing.
ONU and DSLAM integrated applications include: local non-dominant fixed-line operators the transformation of existing communities; new residential broadband network access.
New district are based on current general ONU and DSLAM integrated model, integrated DSLAM in the ONU, can provide 16 or 32 users access (including voice and ADSL). ONU placed in the building of the shaft, the maximum savings in maintenance costs and reduce the length of copper wire.
FTTH and DSL network advantages of integration
FTTH and DSL integration to build the net present the following advantage.
Increased customer bandwidth. As the ADSL bandwidth influenced by the distance, will be fully integrated networking mode DSLAM equipment down, reducing the device to the user computer from a distance, so the user bandwidth is greatly improved.
Increased network availability. From the ONU on the link to
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