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Internetworking Basics LAN Technologies WAN Technologies Internet Protocols Bridging and Switching Routing Network Management Voice/Data Integration Technologies Wireless Technologies Cable Access Technologies Dial-up Technology Security Technologies Quality of Service Networking Network Caching Technologies IBM Network Management Multiservice Access Technologies A CATV network consists of a head-end location where all incoming signals are received and, regardless of their source, frequency-division multiplexing (FDM) is applied, amplified, and transmitted downstream for distribution to the complete cable plant.

Original CATV networks, as shown in Figure: A Simple, One-Way Video Broadcast Topology Using Coaxial Cabling Exclusively, were exclusively one-way, comprised of diverse amplifiers in cascade to compensate for the intrinsic signal loss of the coaxial cable in series with taps to couple video signal from the main trunks to subscriber homes via drop cables.

Historically, CATV has been a unidirectional medium designed to carry broadcast analog video channels to the maximum number of customers at the lowest possible cost.

Since the introduction of CATV more than 50 years ago, little has changed beyond increasing the number of channels supported.

Table: Upstream Cable Specifications summarizes the specifications for the upstream direction.

Good engineering, design, and maintenance practices for CATV plants ensure that these traditional video parameters can easily be met and maintained for operational systems.

MCNS partners included Comcast Cable Communications, Cox Communications, Tele-Communications Inc., Time Warner Cable, Media One, Rogers Cable Systems, and Cable Television Laboratories (Cable Labs).

The Data Over Cable Service Interface Specification (DOCSIS) 1.0 standard that resulted from the MCNS effort was unanimously accepted as the North American standard, and vendors aggressively introduced products in compliance with this standard.

Depending upon the extent of the plant upgrade, the available bandwidth could be as much as from 54 to 860 MHz.

When all components are in place, proper return path alignment is required.

By means of adding an optical RING topography, the cable network affords greater reliability, supports greater bandwidth with the capability to transport more information, and is ready to support two-way operation by the simple addition of requisite components, as illustrated in Figure: Advanced HFC Network with Ring Topography.

(MCNS), with the purpose of defining a product and system standard capable of providing data and future services over CATV plants.

MCNS proposed a packet-based (IP) solution in contention with a cell-based (ATM) solution promoted by IEEE 802.14.

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