dslam

distribution of ADSL Access services.The data signal uploaded by the atm dslam principle is in the ADSL Modem, and the conversion between MAC frames and ATM cells is realized through the AAL5 segmentation and sub-layer SAR) function. After DSL modulation, the signal is transmitted to the DSLAM side of the local terminal. The local DSLAM is demodulated and restor

, there are two main considerations for improving the access rate of broadband users: one is the support capability of the access device itself, and the other is the conditions of the user line. Next we will discuss how to optimize the broadband access network based on the current situation of the broadband access network: I. Support of access devices According to the operator's plan for the network model for the next few years, and taking into account the proportion of low-end users, high-end u

. Next we will discuss how to optimize the broadband access network based on the current situation of the broadband access network: I. Support of access devices According to the operator's plan for the network model for the next few years, and taking into account the proportion of low-end users, high-end users, IPTV users, peak value set line ratio, and other factors, on average, each Broadband User needs at least kbps of access bandwidth. In the early development of broadband, as well as the co

are used to select the corresponding access mode based on the user's actual network conditions. V5 users can access the NGN user access technical network through the TMG8010 of the relay gateway. Two access modes are available: TMG8010 supports V5UA, and V5 signaling is transparently transmitted to SoftX3000 through TMG8010, the Softswitch is used to process V5 signaling and complete V5 user access. TMG8010 supports downstream V5 access. After TMG8010 ends V5 signaling, it is converted to H.248

In the process of construction of metropolitan Area Network, the construction of broadband access network, namely user Resident network, is a hotspot. As a form of broadband access, information community access is being widely concerned by operators. In practice, the current popular broadband access technologies are: ADSL, Ethernet, home PNA, APON, LMDS, HFC and so on, and more mature and reliable, universal implementation of access to two types: ADSL broadband access Mode (mixed-type

of the Access node (users can 10m/100m to the desktop), but also to establish a number of business application service platform; the node or platform is in a special line mode (NX2MB/S, 10/100m, 155Mbps speed) Access to the Internet, in the future to solve the user access authentication, authorization, billing, network management and security issues.2. ADSL AccessAt present, most of the old residential areas without integrated wiring, use of the user's existing ordinary telephone line (do not c

transmitted through pppoe. In addition, there are also the following Features: (1) pppoe can easily check that the user is offline. You can collect statistics on the user's duration or traffic through the establishment and release of a PPP session. The billing method is flexible and convenient. (2) pppoe provides a dynamic IP Address Allocation Method. You do not need to configure any IP addresses, and the network management is easy to maintain. You can solve the IP address shortage probl

operator's perspective, PPPoE has made minor changes to its existing network structure. DSLAM is an ADSL aggregation device. Its kernel uses an ATM or IP address, but the uplink port is an Ethernet port. BAS is the access server that implements the PPPoE function at the local end and ends the PPPoE process initiated by the user side. Downlink Ethernet frames are sent from the IP Man to the BAS through routers. After the PPPoE header is added, the Eth

server: accept internal "calls" through a local tunnel over Ethernet, and then forward them to an ATM connection carrying PPP end-to-end sessions.The local L2TP tunnel containing the PPP group is loaded to the IP Group and then placed on the Ethernet frame. ADSL-NT restores PPP groups and inserts them into ATM cells in segments. In the downstream flow direction, the ADSL-NT receives ATM cells from the network through dslam, reassembles the cells, res

. Dslam is the ADSL convergence device, its core uses ATM or IP, but the upper port is Ethernet port, BAS is the local implementation of the PPPoE function of the access server, it terminated by the user side of the PPPoE process initiated. The downlink Ethernet frame is sent from the IP metropolitan area network via router to BAS, by adding the head of PPPoE to Dslam package into the AAL5 frame, after the

reduce the impact of these interference on Transmission Performance. VDSL2 dynamic spectrum management technology is still under discussion and research. Compatible with ADSL/ADSL2 + Technology Consider the future transition of VDSL2 and ADSL/ADSL2 + hybrid applications, or VDSL2 gradually replaces ADSL/ADSL2 +, the original DSLAM that supports ADSL/ADSL2 + may be changed to DSLAM that supports VDSL2 due t

model assumes that there are 384 users in the residential area, and the average topology of North America is distributed. The prerequisite is that each traffic box is connected to four distribution boxes. The FTTN solution assumes that each user has a DSLAM port. The FTTC and FTTP schemes assume that each household in the community has a port, whether or not it has become a user. Screen. width-333) this. width = screen. width-333 "> Table 1. Installa

Flexible QinQ configuration for the Huawei S8500 switch I. Simple introduction of the principle although common QinQ can solve VLAN expansion and simple L2 VPN functions, however, only a fixed outer TAG can be added to a port, which cannot meet the requirements of adding different outer VLAN tags to users of different services. For example, VLAN 100 ~ 200 for a business user, the outer label 10 is required; VLAN 201 ~ 300 for another service, the outer tag 20 is required; VLAN 10 ~ 20 business r

are implemented to achieve internal enterprise networking. For broadband MAN access in remote counties, due to the single DSLAM interface standard, therefore, for remote terminals with low potential user density, the OUN + DSLAM method should not be used, while the hybrid transmission device + DSLAM board should be used for low density ), map the

ADSL system consists of an office-side device Dslam (digital subscriber line access multiplexer, a user-user-cable multiplexer) and a customer-side device CPE.In the ADSL system, the data transmission direction of the DSLAM to the CPE is called the downward direction, the opposite is the upstream direction, so the ADSL interface of the router is also called the ADSL uplink interface.3. ADSL Main FeaturesTh

Siemens, Germany, has launched a full range of DSL solutions to support the rapid development of the communications industry in response to the broadband and data features of communications networks. Siemens, the largest overseas joint venture Beijing International Exchange System Limited (BISC), has introduced the product ——— Xpresslink to China. Xpresslink with Siemens other data products to provide users with powerful, operator-oriented broadband network of the whole solution. ——— Editor Xpr

indicating whether the ADSL line is activated On the user side, the ADSL filter is used to separate the voice signal from the data signal. In the broadband carrier's data center, the same device exists, isolates the voice and data signals of ADSL users. This is the role of the DSLAM node. DSLAM is the ADSL Modem located in the center of the Central switch module of the broadband operator and connecte

, the uplink communication rate is 16 KB ~ 640Kbps or higher, simulating independent user traffic. At present, it can transmit 6 Mbps signals over 0.5 km on 3.6-core twisted pair wires. G. lite is a simplified ADSL to reduce costs and facilitate the installation of client devices. The downlink speed is up to 1.5 Mbps, And the uplink speed is up to 512 Kbps. No telephone splitter is required. The maximum transmission distance is 5 kilometers. ADSL includes G. (lite) the CO-end device

the continuous upgrade of the "97" system, currently, the customer relationship management and business systems have been gradually incorporated into the "97" system) and billing and accounting systems. OSS is a back-end O M Support System for telecom businesses, including the Network Element/network management system, cable monitoring, resource management and scheduling, and business support system for telecom networks. The centralized Test System for user faults is part of OSS service assura

ZTE D@tall ADSL Access system relies on the existing common telephone copper twisted pair to provide sufficient bandwidth capacity, not only support narrowband voice service, but also support video on demand, conference television, online browsing, E-commerce and other broadband data services, greatly improve the utilization of traditional networks, Create exciting business opportunities for operators and service providers.D@tall adsl6110/8210 Digital Subscriber line Access Multiplexer (