IP DSLAM
Introduction
DSLAM, Digital Subscriber Line Access Multiplexer, is network equipment, in general setup in Telecom Company to receive DSL signals through multiple telephone lines coming from multiple DSL subscribers, to transmit data over high speed back bone network by using multiplex technology.
DSLAM is the basic equipment of DSL system, it provides DSL gateway service through commercial or home-used telephone network to achieve the high speed DSL multimedia services. It splits the high speed data and voice signal from high speed data streaming to satisfy the control and DSL gateway services.
Standard
The International Telecommunication Union’s Telecommunication Standardization Department (ITU-T) has formulated a series of communication protocols such as ITU-T G.992/993 as the xDSL technical standard for xDSL technology to ensure that communication equipment between countries can communicate without hindrance.
– G.994 Handshake procedures for DSL
– G.992.1 (G.dmt) Annex A, B and C
– G.992.2 (G.lite) Annex A and C
– ANSI T1.413
– G.992.3 ADSL2 Annex A, B, C, J, L and M
– G.992.5 ADSL2+ Annex A, B, C, J and M
– G.993.1 VDSL
– G.993.2 VDSL2
– G.993.5 G.vector
– G.998.1 ATM bonding
– G.998.2 PTM bonding
– G.998.4 G.INP
– G.9700/01 G.Fast
– G.993.2Amd 7-Alternative Electrical Length Estimation Method (AELEM)
Application
In the point to point connection of xDSL, DSLAM is mainly collected multiple signals from xDSL modem connected to backbone network through one IP (Ethernet) port, indicates the network management, protocol translation, flow control functions.
It transforms the analog signal delivered from ATM/PTM circuit into digital format by modulation/de-modulation technology. The voice and data packet were split delivered to the equipments to process. To provide the triple play service, besides voice and data, it also equipped with video processing capability, management and IGMP (Internet Group Management) control so can differ customer’s requirement, providing customization DSL services.
Architecture
