Broadband Access Network Overview

Here we will mainly introduce the analysis of the broadband access network management solution, including the distributed broadband network management system solution. With the continuous expansion of China's broadband access network's high-speed backbone network, the focus of Internet applications has been switched to user access networks, content services, business models and management. Currently, in order to build the "Last Mile" of the information highway, the applications of various mainstream broadband access network technologies and networks are rapidly increasing in China. At the same time, various value-added services are emerging and services are constantly improved. As an operating network, its final task is to provide public broadband access services for end users as a management system for broadband access networks, it is also necessary to provide telecom operation-level management services for broadband operators and end users.

1. the system features are flexible and scalable. The network management system must have a flexible architecture. The system can be upgraded and resized flexibly and smoothly Based on the development scale of the broadband access network to maximize user investment;
2. system Security, encrypted data transmission, effective ways to prevent illegal user attacks, to ensure the security of user data and network operations; management of Administrator classification and hierarchical permissions to effectively ensure system security; the re-login function is provided during system operation, which also effectively ensures system security. The VPN is used to build a private network of the network management system, which fundamentally guarantees system security;
3. Availability and practicability of the system. The system should adopt an efficient and real-time architecture design to ensure that the system can play a role in broadband construction and greatly facilitate the management and maintenance of broadband access networks;
4. system scalability ensures that system upgrades during broadband access network operation do not affect business operations;
5. High system reliability. The system should be able to provide load sharing and redundant backup functions in key subsystems;
6. Efficient system operation, timely and effective identification of Network Operation faults and fault locating, to save network operation and maintenance costs, improve network operation quality, and reduce user complaints;
7. versatility of the system structure. It is applicable to complex network structures, such as networks with or without NAT );
8. The operational features of the system allow end users to be managed based on device management, and various business reports can be generated at the same time;
9. The network resource management feature allows you to collect statistics on the usage of network resources and generate reports based on various network resource attributes;
10. The system is adaptive to the network scale and can monitor and manage large-scale networks in real time without blind spots, effectively ensuring network operation;
11. stability of system performance to ensure the continuous operation of broadband access network services;
12. the openness and standardization of the system provides flexible and simple interfaces for effective interoperability with other subsystems of the broadband operation system, such as billing and business subsystems; at the same time, it can effectively monitor and manage devices from multiple manufacturers.

Broadband Access Network Management Solution Analysis

Core switching Layer
Backbone service routing and switching service. It carries services from various access parks and generally consists of large-capacity GSR or L3 switches. At this level, devices are limited in size and have a relatively simple type. Therefore, there are already perfect solutions for device management.

Access aggregation Layer
That is, we usually call it a local aggregation and community-level equipment to distribute user services. Generally, the device management at this layer is processed together with the device at the access layer.

User access layer
Usually refers to the building and corridor level equipment, mainly to complete the centralized user business access. This layer features a large device scale and a wide range of device types, and there is no complete solution for device management.

The management of broadband access networks refers to the management of access aggregation and user access layer devices. In view of the development status of broadband access networks, centralized network management policies are adopted. There are two centralized network management policies: the city and campus network management policies are also emerging in another network management mode-distributed network management policy. The advantages and disadvantages of various network management solutions are briefly analyzed.

Solution 1: B-Metro centralized network management system solution

Urban centralized network management implementation solution: Network Management workstations are set up in the Central Data Center of the man network. The network management system on the network management workstation of the Central Data Center directly manages the broadband access network devices of each campus. The advantage of this solution is that the structure is simple and the investment cost is relatively low. Disadvantages:
1. All network devices are required to be valid IP addresses, which cannot solve the complex network with NAT conditions in the broadband access network;
2. Because the access device is directly managed, a large amount of bandwidth is required;
3. It is not suitable for real-time monitoring and management of large-scale access networks, which may easily lead to blind spots in network management;
4. It is difficult to unify device management and user management;
5. The entire network operation relies on the implementation of the local network management and operation system;
6. The network management and maintenance personnel of the Central Data Center have a heavy operation workload. Due to the large network scale, the personnel of the central data center are unable to learn in detail the usage of the equipment in each Park, which brings difficulties to the operation.

The centralized management system of metro networks manages and operates the entire network in the Central Data Center. To ensure the operational efficiency of the network management system of the Central Data Center, the network scale must be balanced with the number of network management systems in the Central Data Center. Generally, the performance of a centralized network management system is significantly reduced when managing networks with more than 2000 network elements. The Network polling cycle of about 2000 network elements takes nearly one hour in the worst case. In this case, network O & M is very passive. It is recommended that the number of network elements managed by a network management system be round-robin at around 200. In the worst case, it may take nearly 6 minutes ). As the network grows, the number of local network administrators increases and the cost increases.

Solution 2: Campus centralized network management system solution

Campus centralized network management implementation solution: Set up a network management workstation in the central data center of the park, and directly manage the broadband access network equipment in the park through the network management system on the campus network management workstation. The advantage of this solution is that the structure is simple, the investment cost is relatively low, and the devices occupy less public IP addresses.

Disadvantages:
1. It is not suitable for real-time monitoring and management of large-scale access networks, which may easily lead to blind spots in network management;
2. The maintenance cost is high. administrators need to poll the campus network management workstation one by one to understand the operation status of the whole network;
3. interfaces with other operation subsystems cannot be implemented;
4. The entire network device cannot be effectively managed in a unified manner;
5. Unable to effectively combine device management with user management;
6. the user data and device data of each campus are relatively independent and cannot be managed in a unified manner, especially when the network size keeps growing.
Because the Centralized Network Management System of the campus is used to manage and operate the networks of each campus in the IDCs of each community, a centralized network management system must be installed in the IDCs of each campus, at the same time, the campus systems must install databases to maintain their respective device resource data and user resource data. From the cost point of view, the cost of a campus network management system is low. Although temporary operations can be ensured, the problems of data unification and consistency management will be exposed when the network size increases, at the same time, data security is also an issue that needs to be considered. This solution will be phased out, and investment will not be guaranteed, although the cost is low.

Solution 3: distributed Broadband Network Management System Solution

Distributed Broadband Network Management Implementation Scheme: a centralized network management and monitoring system is placed in the local data center, and a centralized network management system is placed in nodes in each campus. The local network management system manages and monitors access network devices through the campus network management system, the local network management system focuses on the management of devices and services, while the campus network management system focuses on the management of access devices. The disadvantage of this solution is its complicated structure and high investment costs.
Advantages:
1. It is suitable for real-time monitoring and management of large-scale access networks without blind spots in network management;
2. easy maintenance. administrators can monitor the network-wide devices in real time in the local data center to understand the network-wide operation status;
3. interfaces with other operation subsystems are easy to implement;
4. Able to manage devices and achieve broadband business operation at the same time;
5. The system is highly scalable and can adapt to the evolving scale of broadband access networks to protect investment;
6. High system scalability. When the system is expanded, the operation of broadband access network services will not be affected;
7. User data is centrally stored on servers in the central data center to ensure unified data maintenance;
8. because the local network management system and the campus network management system have their own databases, only the backup and consistency of key data can be achieved. This ensures system reliability and reduces the data maintenance workload of each subsystem.

D-Link: the new generation distributed Broadband Network Management System D-Vision and its broadband access network management solution are a distributed network management solution designed specifically for the large-scale and operational characteristics of broadband networks of telecom operators, in addition, the broadband access network is located on the intermediate layer of the backbone network and end users. Therefore, while inheriting the traditional IP network management system's idea of device management, it also adds a simple terminal user management function, it can effectively help operators achieve the "operational and manageable" development goal of broadband network services. Highly targeted, especially for telecom operators), highly compatible with products of other vendors), high-performance, secure, efficient, and easy-to-use, and maintainability.

D-Vision adopts the centralized management mode for databases, which is in line with the telecom-level user's operation mode for centralized management and maintenance of key data. It can manage heterogeneous networks, for example, you can manage network devices across NAT; you can accept user services and reserve business system interfaces; in addition, it also supports Simple user management, which can be combined with device management, handles account opening and account sales operations to fully meet the needs of telecom business expansion and management. As a distribution