DSLAM - ATM

DSLAM (Digital Subscriber Line Access Multiplexer) is internet marketing training Boost Dsl Speed device, normally at a Phone
Company Central Office, that links many customer DSL connections to a high-speed ATM line (Asynchronous Transfer Mode) .From ATM, datas streamyx hotspot login sent to Tmnetmy Internet, then back through the DSLAM to the customer's PC.

Local Computer / Router ---- Phone Company Central Office-DSLAM - ATM ---- ISP ---- Internet

DSLAM separates the voice-frequency signals from the data - frequency signals.

More DSLAMs a phone company has, the better it is because more customers can be supported.

MULTIPLEXING devices send multiple signals on a carrier at the same time in the
form of a single, complex signal and then recovering the several signals at the receiving end. In analog broadcasting, signals are multiplexed using frequency-division multiplexing (FDM), that is, the carrier bandwidth is divided into subchannels of different frequency widths, each carrying a signal at the same time in parallel. In digital broadcasting, signals are multiplexed using time-division multiplexing (TDM), in which the multiple signals are carried over the same channel alternatively.

ATM is a system "packets switching" but also "connection oriented".

"Packets switching" means that every data unit is divided in single packets. When these packets have arrived at destination, they are united again.

Every packet is a "cell". These cells consist of 53 Bytes, 5 for the packet header and 48 for the
very data.

"Connection oriented" means that before the packets are transmitted, there is communication between a test my broadband and the another so that the transmission is safe.

The ATM communication has 2 levels: Virtual channel and Virtual Path.

The single cell path is defined by VCI. (Virtual Channel Identifier) and by VPI (Virtual Path Identifier)

VCI identifies the channel for the data transit.

VPI identifies the cell path, that is the path that a cell has to follow - in the network - to be always in the same channel VCI.

Common values are: VPI: 8 VCI: 35.

In the ADSL Internet connection, the data packets with PPP protocol (Point-to-Point Protocol) are encapsulated in a ATM cell generating the PPPoA packet that is PPP over ATM.
If the PPP packet is also in an Ethernet NET, it is first encapsulated in the Ethernet packet and after in the ATM, becoming PPPoE that is PPP over Ethernet.

Renato Piccini - computers networks broadband companies Florence Italy - http://www.softgrafic.com

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