Key Features
Cisco 1400 Series Router Installation and Configuration Guide
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concentrating all traffic onto a single high-speed trunk for transport to the Internet or the
enterprise intranet. A device similar to a DSLAM; different manufacturers use different
terms for similar devices.
• Asynchronous Transfer Mode (ATM)—A connection-oriented data transfer mode that
segments data into fixed cell-lengths (53 bytes), transports the cells, and reassembles
them at the destination. ATM does not limit how fast data can be transferred over a
connection. The fixed-cell-size feature enables ATM to send any type of data efficiently.
• Protocol: ATM, any AAL, 25-, 155- or 622-Mbps internal ATM multiplexing bus.
• Digital subscriber line access multiplexer (DSLAM)—A telephone central office
multiplexer, such as the Cisco 6200, that supports ADSL ports over a wide range of
network interfaces. A DSLAM sends and receives subscriber data (often Internet
services) over existing copper telephone lines, concentrating all traffic onto a single
high-speed trunk for transport to the Internet or the enterprise intranet. A device similar
to an ASAM; different manufacturers use different terms for similar devices.
• Discrete Multi-Tone (DMT)—The American National Standards Institute
(ANSI)-specified method of data signal modulation for ADSL.
• Internet service provider (ISP)—A company that provides other companies or
individuals with access to, or presence on, the Internet.
• Microfilter—A device that prevents certain router frequencies from travelling over the
telephone line and interfering with telephone calls. For information on the type of
microfilter to use with your router, contact your service provider or Cisco reseller.
• Point-to-Point Protocol (PPP)—A protocol that transfers data over a WAN using
bidirectional synchronous or asynchronous connections between two endpoints. PPP
controls the call setup between the Cisco 1400 series router and the remote device. PPP
enables the Cisco 1400 series router to multiplex various protocols over individual
virtual connections. IP and IPX packets can be sent over PPP with ATM establishing the
connection between the two devices.
• Permanent virtual connection (PVC)—ATM requires that a circuit (or connection) is
established that will pass data between the two devices. This connection is not a
physical connection but a logical or virtual connection.
The Cisco 1400 series router supports PVCs to establish an end-to-end connection to
the remote device. The router does not support switched virtual connections (SVCs).
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