SDH access skills learning notes

There are many access technologies, and SDH access is also widely used. Here we mainly introduce the transformation from SDH access to network edge and integrated multi-service platform, this includes introduction to TOPAccess and other aspects, and I hope to help you.

1. Transformation from SDH access to network edge and Integrated Multi-Service Platform

SDH is the main transmission system of telecommunication networks. With the emergence and development of WDM, SDH access is moving to the edge of the network. In the process of SDH access becoming a network edge transmission and access to the main device, in order to meet a large number of introduced broadband services and broadband access means, and the diversity of access technologies used by the network edge, the differences in user needs, and the diversity or variability of network structures ), in this way, SDH access is transforming from a pure transmission network to a multi-service platform integrating the transmission network and access network, that is, to the network edge and to an integrated multi-service platform. This is because various network services require a highly reliable transmission network for bearing, and SDH access networks are familiar with and trusted with their powerful protection and recovery capabilities and fixed latency performance, to reduce the investment cost of network equipment, simplify the deployment and management of network services, adapt to multi-service applications, and form an integrated SDH node at the business layer and transport layer, as a converged multi-Business node or multi-business platform, SDH access platform is mainly positioned at the edge of the network.

The SDH multi-service platform is applied to network edges and has the advantages of reducing a large number of independent business nodes and transmission node devices, simplifying the node structure, thus greatly reducing the investment scale of equipment and saving room space, reduces maintenance workload, power consumption, and network operator operation and maintenance costs. After the integration of Ethernet, frame relay, or ATM, the SDH platform that provides multi-service access capability can also flexibly and quickly access multiple new and old services from the carrier's local terminal to the user end, it helps network operators increase business revenue and enhance market competitiveness.

2. The optical fiber access market calls for a low-cost SDH multi-service access platform

The advancement and penetration of SDH/MSTP Technology to the network edge has become the development trend of the optical fiber access market. Because SDH/MSTP Technology overcomes the absence of unified rate standards for the optical interfaces of PDH devices, the access layer PDH Optical terminal and the aggregation layer SDH/MSTP network can only achieve back-to-back connections through physical interfaces such as E1. This reduces the investment in cables and DDF distribution frames and improves access reliability. Using SDH technology in multiple service access devices also completely solves the problem that the original use of PDH Optical terminal will block the organic connection between the aggregation layer and the access layer on the network management, this makes it easy to implement centralized monitoring and flexible resource allocation. Now, some telecom operators have begun to limit the large-scale use of the PDH system on the telecom network. Telecom operators are seeking for a new technical means or solution, which not only has the advantages of uniform optical interface standards, flexible networking, and convenient O & M, it is cost-effective, easy to use, fast and efficient. Therefore, this new multi-service access transmission system has the basic functions of SDH and has the ability to access multiple services. It supports transparent transmission of data services and provides the function of gathering services between point-to-point and point-to-point, it not only has the ability to optimize data transmission and upgrade, but also provides bandwidth management capabilities for businesses. It also has the ability to smoothly upgrade various services. Because the network edge access layer has a small business volume, a wide distribution of transmission nodes, and a large number of nodes, It is very sensitive to device prices and requires low costs and high environmental adaptability, and supports complex networking, therefore, the new SDH multi-service access device, which prices close to PDH, has become the most promising and popular product in the current low-end optical fiber access market.

3. tianyuan Countermeasures

Since the establishment of tianyuan information, the company has been demonstrating its unique charm in the field of low-end optical transmission and access equipment. Today, the PDH Optical terminal machine market in China is fiercely competitive. In order to enhance competitiveness and occupy a larger market share, the competition for product prices, functions, technologies, sales channels, after-sales services and other aspects has been fully explored. As SDH/MSTP continues to extend to the network edge and multi-service access layer, SDH technology has become a trend in low-end optical access devices. The transformation of optical terminal technology and product market integration have become a reality. In order to seize the challenges and opportunities of shuffling the low-end optical access product market, the company's top leadership decided to develop a low-cost SDH multi-business access platform TOPAccess, this platform will continue the modular and configurable features of optical terminal machines in our company. It has flexible networking capabilities and network protection functions in SDH, based on technical advantages such as hybrid networking with SDH devices of other manufacturers and remote maintenance through network management, the re-Timer technology is also adopted, it greatly improves the timer signal quality of 2 Mb/s business, so as to be able to well adapt to those businesses that need to obtain high-quality timing benchmarks from the received signal. Some experts believe that the launch of this low-cost SDH multi-service access platform will make it possible for telecom operators to use SDH technology in large-scale urban access networks.

4. Features of TOPAccess low-cost SDH multi-service access platform

TOPAccess is a new SDH multi-service access platform. It consists of local terminal frame devices, 1U modular structures, and 1U single-board structures. The technical performance and indicators of TOPAccess comply with the main specifications of ITU-T and National SDH standards, provides unified access, aggregation, switching, transmission and management functions for TDM and broadband IP services such as E1, V.35, and Ethernet, it can be used to integrate multiple services of major telecom customers, various private networks, network edges, and terminals. TOPAccess is mainly positioned for various business access and transmission at the access layer in the communication network. It reduces user access costs while improving the operator's network resource utilization, it is an economic and effective solution that provides operators with secure, efficient, and easy-to-use Metro Ethernet leased lines and multi-service access such as E1 and V.35.

TOPAccess structure concept

TOPAccess adopts the modular multi-service access platform design concept. The transmission module and the business module are separated to support multiple services. The local machine uses a "bench-type" plug-in card structure, providing a full crossover capability of up to 32 optical directions and 24 VC4, and 16 business module slots. The remote machine adopts a slot structure, provides four business module slots, each of which provides up to four VC12 channels. Both local and remote machines can be flexibly configured in combination for a variety of businesses. Business slots can be mixed and hot swapping is supported.

Services supported by TOPAccess

TOPAccess provides multiple service interfaces and transmission interfaces, and supports access through the SDH core network. Available businesses include fast Ethernet interfaces FE), broadband data interfaces V.35), 2 Mb/s electrical interface E1), 155 Mb/s Optical interface STM-1), voice, RS232/485/422, and so on. Ethernet service supports VLAN. The built-in 2 Mb/s signal reset time and Pointer Adjustment bypass function make E1's transmission performance as well as PDH, so TOPAccess not only inherits the advantages of General SDH access devices, it also introduces the features of traditional PDH access devices, so as to completely replace the original PDH access device while retaining the functions of general SDH devices for the access layer.

TOPAccess networking

The TOPAccess device supports multiple networking modes and supports flexible networking. Its powerful networking capabilities support point-to-point, chain, Star, ring, and other networking modes. Because SDH technology standards are adopted, TOPAccess can be connected together with SDH devices of other manufacturers. This allows operators to access key accounts, private network applications, and network edges and ends, you can get cost-effective benefits from using TOPAccess devices.

TOPAccess configuration and management

TOPAccess adopts flexible query, configuration, and management ideas. It supports end-to-end performance detection and near-end Remote Fault alerts. The optical interface and E1 interface provide line-side and device-side loopback functions to facilitate device maintenance. TOPAccess devices can be managed through SNMP/Console/panel settings. Standard SNMP network management, standard TL1 command line management, and Panel operation management are supported, provides users with the same convenient activation capabilities as PDH access devices, making network management, operation, and maintenance relatively simple. In addition, the TOPAccess device has the power monitoring function. The remote device of the client has the built-in power monitoring module, and the remote power supply is automatically reported to the local network management. In order to distinguish the fault category, in particular, it provides convenient conditions for automatic failure monitoring of remote unattended data centers.

In short, TOPAccess uses SDH access technology kernel, provides open SDH optical interface, so that the VC-12 directly to the user, to achieve end-to-end VC-12 performance monitoring, SDH optical port and convergence network smooth connection, and protect the carrier's network device investment. TOPAccess features modular platform design not only supports a variety of traditional business access, but also has certain new business access expansion capabilities. In addition, its built-in re-timing technology makes TOPAccess have the advantages of traditional PDH access devices and general SDH access devices, it has become the best replacement product for high-end PDH access devices that have both the advantages of General SDH technology.

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