FTTx network terminal equipment backup power supply guarantee solution

Telecommunication operators in various countries are actively promoting and building FTTx networks. In the application process of FTTx network, it also brought about changes in the power supply of the access layer network and access layer equipment, and triggered the industry's thinking and big discussion about the backup power supply guarantee of FTTx terminal equipment.

1. FTTx brings changes to the access layer network

1.1 Changes in the access layer network

After the implementation of the strategic transition from optical to copper, the new FTTx network has changed greatly compared with the traditional PSTN network. The FTTx network not only changes the transmission medium from copper wire to optical fiber, but also directly connects the central office OLT equipment to the user-side ONU equipment through the optical fiber, and then the ONU equipment provides users with data, voice, video and other services, and transmits signals It has been changed from the original electrical signal to an optical signal. Therefore, it can be said that the implementation of the optical back-to-copper system has brought revolutionary changes to the access layer network, and has gradually evolved from the original analog voice network to the digital IP network.

1.2 Reform of power supply at the access layer

From the perspective of power supply, the traditional PSTN network is physically connected. The MDF distribution frame in the telecommunications room is wired to the end user through copper wire. In addition to transmitting signals, the copper wire also provides remote power supply to the user terminal. The electricity is uniformly supplied by the rack power in the telecommunications room.

For the physical connection of the FTTx network, the OLT equipment at the central office and the ONU / ONT equipment at the customer end are transmitted through optical fibers. Among them, the OLT equipment is co-located with the existing telecommunications room, and the basic power supply of -48V is generally used. A large number of added user-side ONU / ONT devices are generally placed outside the telecommunications room such as corridors or user's homes. These ONU devices need to be separately configured with power, and the power supply of the user terminal phone is supplied by the connected ONU device, thereby the FTTx network A large number of active nodes have been added.

2. FTTx terminal equipment power supply status and problems

At present, FTTx terminal equipment generally uses the nearest AC mains power, including directly using AC 220V mains power or converting the AC 220V mains power to DC-48V or 12V through a power conversion module, and most nodes do not have backup power supply considerations Or, some important nodes are only equipped with a simple backup power supply, the power supply mode of the device is more confusing and the backup power supply scheme is less standardized, which brings greater security risks to the power supply reliability of the communication network.

Moreover, in terms of the device's own power input interface, the design of various manufacturers in this area can also be described as varied. Only professionals or special tools can install and maintain the equipment, which brings great inconvenience to operation and maintenance management.

3. The necessity of backup power supply guarantee

It is precisely because FTTx brings important changes to the power supply of the access layer equipment, which leads to the discussion of whether FTTx terminal equipment needs to provide backup power supply guarantee. Here, we focus on analyzing the impact of FTTx terminal equipment after power failure, and believe that in the FTTx network planning and construction process, FTTx terminal equipment backup power supply protection should be considered.

3.1 Impact of FTTx terminal equipment after power failure

After the application of the FTTx network, a large number of active nodes are added at the end of the communication network. Each node carries a user or dozens or even hundreds of users, and the power supply reliability of these nodes is very low, which is not up to the carrier-grade level. Power supply guarantee level, once the mains power is cut off, all services of the node's access users, including traditional voice services, will not be provided, resulting in the interruption of the communication network within the jurisdiction of the node. However, the mains power outage often has the characteristics of a district, which will affect the communication network of hundreds or even thousands of nodes in a district. The impact is very wide, which not only affects the business income, but also causes a great negative impact on society.

3.2 Increased customer experience contrast

The traditional PSTN access network is uniformly supplied by the telecommunications equipment room, and the power supply reliability is high. Even if the mains power is interrupted, the telecommunications equipment room is equipped with a backup power supply, which will not affect the normal use of the communication network. It has been thought in my mind that the fixed telephone network will never be interrupted, and the fixed telephone is far more reliable than the mobile telephone.

Because FTTx terminal equipment currently does not consider backup power supply guarantees, as FTTx is more and more widely used in telecommunications networks, the probability of user circuits being interrupted due to power outages continues to increase, which not only affects users' Internet access, data and other services, but also Even users have always believed that the uninterrupted voice business is also affected, which greatly contrasts with the original customer experience and reduces customer satisfaction.

3.3 The power failure of FTTx terminal equipment is greater than other network equipment

In the existing communication network, there are also other functional sites such as mobile base stations, PHS base stations, and video monitoring points. These sites are also active nodes and need to be powered, but the network coverage of mobile base stations and PHS base stations is generally mutual. There is repeated coverage between each other. The power outage of a certain site will only affect the signal strength of this area or the normal use of a small number of users. Generally speaking, it will not cause interruption of the entire network; and the brief interruption of video surveillance points is even more It will not bring much impact. After all, it is difficult for ordinary people to find out whether the video camera is working normally, and its deterrent effect is still there.

FTTx nodes are different from the above sites. Networks, voice and other services are closely related to human life. Once interrupted, it immediately brings great inconvenience to the user's normal life and also brings great contrast to the user experience. Therefore, FTTx The power supply guarantee of the terminal equipment should be in a more important position. The impact of the interruption and customer experience are much greater than the interruption of other functional sites such as mobile base stations, PHS base stations, and video monitoring points.

A life-support system is a system that exists to maintain the normal operation of life. In the daily life of human beings, information life has become more and more important. When there is an emergency or when you need to ask for help, it is the most natural idea for everyone to use fixed telephones to maintain information communication. Therefore, the communication network has become an indispensable part of the human "life support system". As a telecommunications operator with a sense of social responsibility and the courage to bear this responsibility, it should also provide uninterrupted humans from this height. Survival information service.

3.5 Backup power supply guarantee for foreign telecom operators

Implementing the strategic transformation of the FTTx access network and extending optical fibers to users has become a common strategic decision for mainstream operators worldwide, and is already advancing rapidly. Foreign telecom operators are also considering the backup power supply guarantee of FTTx equipment while applying on a large scale, as follows:

1) The AT & T in the United States constructs the FTTB, and generally considers the backup power supply guarantee. The indoor application mainly uses the uninterruptible power supply AC UPS as the backup power supply. According to the 2-4 hour backup guarantee time, the outdoor application mainly uses the AC / DC and battery as the backup power supply. At least 4 hours of backup guarantee time is considered.

2) The construction of FTTB by Telecom Italia, due to the high quality of the power grid, the average power outage time is within 3 seconds / year, so the backup power supply time is considered short, there are two main considerations: the use of switching power supply and battery backup power supply, the backup power supply guarantee time is 0.5 ~ 1 hour to consider; adopt switching power supply and super capacitor for backup power, the backup power supply guarantee time is considered as 3-5 seconds.

3) Deutsche Telekom and France Telecom built the FTTB. Due to the very high quality of the power grid, it will almost never lose power. Therefore, it does not consider the backup power supply guarantee. In case of an emergency such as a power outage, the fixed line voice service is supplemented by mobile phones.

Therefore, based on the above analysis and drawing on the considerations and specific practices of foreign telecommunications operators in terms of backup power supply guarantee, we believe that domestic telecommunications operators should also pay attention to and consider the power supply guarantee of FTTx terminal equipment, especially before large-scale promotion of FTTx network construction The backup power supply guarantee solution should be planned. Once the backup power supply guarantee is needed, the backup power supply guarantee can be deployed and realized very quickly and conveniently.

4. Ideas and suggestions for backup power supply guarantee

FTTx has brought revolutionary changes to the entire access layer network, and also added a large number of active nodes. The number of nodes will be tens or even hundreds of times that of the original access network. Therefore, consider the backup power supply guarantee for such nodes At this time, it is necessary to break through the construction and development and operation modes of traditional communication networks. It should not be considered to be monopolized by telecom operators, and the power supply guarantee and daily maintenance of such nodes should be considered as simple and convenient as possible.

4.1 Diversification of backup power supply guarantee solutions

The installation environment of the FTTx node is restricted by various on-site factors. Therefore, the backup power supply guarantee of the FTTx terminal equipment should be based on the local actual situation and the customer guarantee level to develop the most reasonable solution. To achieve this, it cannot be constrained by certain Specific solutions, and must provide a variety of backup power supply security solutions.

4.2 Backup power supply guarantee should be open

The FTTx terminal equipment itself should provide an independent standard power input interface, which can be easily and conveniently connected to a variety of backup power systems, and the access of these backup power systems should not require professionals or professional tools to complete. The maintenance of the backup power supply system should also be simple and convenient, and can be completed independently by non-professionals after simple training or even without training.

4.3 Back-up power supply guarantee gradually "home appliance"

The backup power supply guarantee should be market-oriented and customer-oriented, formulate different marketing strategies through the marketing department, take the road to marketization, consider the different needs of customers, provide optional services, and the customers themselves choose the solution that suits them, and the backup power supply The maintenance and replacement of security equipment is developing in the direction of "home appliances" (used and maintained by consumers after being purchased like household appliances), especially the FTTH mode ONT equipment, like traditional telephone terminals, let customers bear the responsibility Routine maintenance and replacement of similar equipment, as far as possible to reduce the cost pressure of telecom operators' operation and maintenance.

4.4 ONU equipment power supply should realize remote monitoring

The number of nodes in the FTTB mode is large. In order to better control the power supply operation status of each node, reduce power maintenance, and improve maintenance efficiency, remote centralized monitoring of the power supply operation status of all ONU equipment should be implemented, and the configuration of the monitoring signal should be as much as possible. streamline. The power supply of ONT equipment in FTTH mode should not be included in the monitoring system.

4.5 Backup power supply guarantee equipment should consider "maintenance-free"

The number of nodes in the FTTB mode is large. When considering the configuration of external backup power supplies, these power supply equipment should consider that there is basically no need for maintenance by telecommunications professionals. The judgment of the backup power supply, especially the working state of the battery, whether it is invalid should be simple and clear. The replacement of the battery should be convenient and fast.

5. Conclusion

In general, before large-scale implementation of optical fiber copper, we must fully consider the importance of FTTx terminal equipment backup power supply guarantee, and guide and standardize equipment manufacturers to design and develop qualified products that meet our actual needs for the future. After large-scale construction, we can configure the backup power supply of FTTx nodes very conveniently and quickly and at a low cost, completely solving the backup power supply guarantee for such equipment.

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