Technical Concepts; Digital Subscriber Line (Dsl); Asynchronous Transfer Mode; Encapsulation Methods: Ppp And Rfc 1483 - Efficient Networks SpeedStream 5600 Series Installation Manual

Technical Concepts

This section provides very brief descriptions of some of the features
available on the 5600 series router/bridge.

Digital Subscriber Line (DSL)

DSL describes a family of digital services provided by local telephone
companies to local subscribers. There are many forms of DSL:
Asymmetric DSL (ADSL), Symmetric (or single pair) DSL (SDSL), and
many others. The router supports ADSL, which provides rates of up to 6
Mbps downstream from the customer and up to 640 Kbps upstream from
the customer. DSL can carry voice and data signals at the same time in
both directions.

Asynchronous Transfer Mode

ATM is a fast, cell-based technology defined by the ITU-T. It works by
taking an ordinary, variable-length data packet and segmenting it into
53-byte cells prior to transmission. The data is transmitted over virtual
channels that are designated by specific unique identifiers (virtual channel
identifiers or VCIs). There can be multiple VCIs in one virtual path. The
virtual path also has a unique virtual path identifier (VPI).
Data transmitted over ATM VCs is routed by ATM switches. At the
destination node, the cells are reassembled into packets.
Only one virtual path is supported on the device. In router mode, only one
virtual channel is supported. However, in bridge mode, up to 16 virtual
channels can be configured to be used as individual bridge ports.
Encapsulation Methods: PPP
and RFC 1483
The 5600 series router transmits data via ATM Virtual Channels (VCs).
The data is encapsulated using Point-to-Point Protocol (PPP) or RFC
30 Technical Concepts Efficient Networks, Inc.