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ChannelWorks Internet Brouter

HIGHLIGHTS

o  Provides cost effective, high speed Internet access

o  Complies with computer industry standards for Ethernet, TCP/IP, and SNMP,
   and with cable TV industry standards

o  A ChannelWorks network, which can include ChannelWorks Bridges, Internet
   Brouters, and future ChannelWorks products; uses only one forward and one
   reverse 6 MHz channel

\ChannelWorks PORTFOLIO\

The ChannelWorks Internet brouter is the second product in the ChannelWorks
portfolio, building on the success of the ChannelWorks bridge.

The ChannelWorks bridge addresses the needs of education, government,
healthcare, and business users seeking lower cost alternatives for high
speed connectivity across the community, with cable TV as the connectivity
medium. These users look to the ChannelWorks bridge for applications such as
distance learning, telemedicine, electronic commerce, and geographic
information systems.

Besides networking across the community, ChannelWorks users need inexpensive
connectivity to the Internet -- to access worldwide databases and
information repositories such as the World-Wide Web and WAIS (Wide Area
Information Servers), and to expand their network access to other companies
and institutions worldwide in a cost effective manner. The ChannelWorks
Internet brouter can provide such high speed Internet access, offering
concurrent bridging and IP routing.

With the addition of the ChannelWorks Internet brouter, the ChannelWorks
product family now provides distributed, high speed, intercommunity, and
intracommunity networking, using the existing commercial cable TV plant. The
ChannelWorks technology is optimized to run on commercial cable plants
without interfering with adjacent channels (such as HBO or The Movie
Channel). ChannelWorks products can also run on institutional networks
(INETs), which are specifically designed by cable TV operators for business
use (but often underutilized). In addition, they can run on the large
installed base of private broadband plants, such as those at government
sites and military bases.

PRODUCT DESCRIPTION

The ChannelWorks Internet brouter uses a bidirectional, single or dual cable
plant to provide symmetrical data transmission at a signalling rate of 10
Mbps. The brouter is frequency agile, allowing it to operate in any
available standard 6 MHz channel, over a frequency range of 10 to 550 MHz.

This product is an IP-only router between an Ethernet network and a cable TV
network. All other packets are transparently bridged, using the IEEE 802.1D
spanning tree protocol. Routing tables are maintained using the routing
information protocol (RIP1).

For IP packets the ChannelWorks Internet brouter:

o  Conforms to specific Internet protocols, including the Internet protocol
   (IP), Internet control message protocol (ICMP), and others when required.

o  Interfaces between an Ethernet and a ChannelWorks cable TV network and
   performs required functions such as encapsulation/decapsulation,
   sending/receiving datagrams, IP destination address translation, and
   network flow control and error handling.

o  Receives and forwards Internet datagrams, providing buffer management,
   congestion control, and fairness.

o  Chooses a next-hop destination for each IP datagram.

o  Uses the RIP interior gateway protocol to execute distributed routing and
   reachability algorithms with other routers.

o  Provides network management and system support facilities.

For non-IP packets, the ChannelWorks Internet brouter uses the spanning tree
algorithm, automatically learns the locations of devices by listening to
network traffic, and forwards packets only when necessary. Packets that are
not forwarded are considered "filtered."

Typical operation is as follows:

o  A user sends out a data packet to a remote address.

o  A locally attached ChannelWorks Internet brouter forwards the packet to
   the cable TV network.

o  A ChannelWorks Internet brouter at the remote site recognizes the address
   and forwards it to the correct Ethernet segment and its final
   destination.

The brouter can connect to any standard IEEE 802.3 or Ethernet network using
an AUI port (10Base5); adapters are also available for 10Base2 and 10BaseT.
In addition, the brouter can connect to any IEEE 802.7 compliant cable TV
system, using a pair of standard 6 MHz channels and 2 "F" connectors.

The brouter can be installed in a desktop, rackmount, or wallmount
configuration and has a form factor similar to that of a standard, "set-top"
converter device.

BENEFITS

The ChannelWorks Internet brouter provides both connectivity of Ethernet
LANs across a community and high speed Internet access at a fraction of the
cost of other available solutions.

With the ChannelWorks Internet brouter and ChannelWorks product family,
users can link together schools, businesses, healthcare facilities, and
municipalities into electronic communities, with access to each other as
well as to other communities on the Internet.

Users also benefit from the following set of functionalities:

o  Cost effective routing for Ethernet to cable TV networks.
o  Routes IP traffic.
o  Concurrent MAC layer bridging for non-IP traffic.
o  Conforms to IEEE 802.1 (d) spanning tree protocol.
o  Conforms to RIP1 routing protocol.
o  Conforms to IEEE 802.3/Ethernet standards.
o  Conforms to RFC 1058, 1122, and 1123 as required.

AVAILABILITY AND ORDERING

The ChannelWorks Internet brouter is available now.

Order No.        Description

		 ChannelWorks Internet Brouter and Documentation:
DECTV-CA	 ChannelWorks Internet brouter
AA-QAF6A-TE	 ChannelWorks Internet Brouter Network
		 Installer's Guide
AA-QAF7A-TE	 ChannelWorks Internet Brouter Cable TV
		 Installer's Guide
AA-QAF8A-TE	 ChannelWorks Internet Brouter Management Guide

TECHNICAL DATA

Performance

o  Forwarding rate: 6,000 packets per second (parameter dependent).
o  Filtering rate: 13,000 packets per second.

Manageability

o  SNMP network management for configuration and maintenance.
o  Implements SNMP's MIB-II support for dumping RIP routing tables, enabling
   enhanced troubleshooting of network problems.
o  Can be managed in-band, over the network, or from a local EIA RS232
   console port.

Cable TV Features

o  Supports distances of up to 70 miles, roundtrip, from the head end.
o  Supports bidirectional, single and dual cable plants.
o  Frequency agile across frequency range of 10 to 550 MHz.
o  Operates in any available 6 MHz channel.

Security

The ChannelWorks portfolio provides a security group feature that allows
multiple users to share the same RF channel while operating as if they are
on different networks.

A secure ChannelWorks network is provided via features such as IP address
filtering, traffic type filtering, and broadcast and route filtering.

Built-in security features prevent tampering with the cable TV receive and
transmit frequencies.

RF Electrical Specifications

o  Signalling rate: 10 Mbps.
o  Modulation: quadrature phase shift keying.
o  Spectral efficiency: 1.67 bits/Hz.

Transmitter

o  Minimum frequency range: 10 to 174 MHz.
o  Bandwidth: < 6 MHz.

Receiver

o  Minimum frequency range: 54 to 550 MHz.
o  BER @ 25 dB C/N: <1 in 10 to the 9th power.

Installation

o  Desktop, rackmount, and wallmount.
o  Single cable plant requires a frequency translator.

Physical Dimensions

o  Length: 11.5 inches.
o  Width: 11.5 inches.
o  Height: 3.47 inches.
o  Weight: 12 lb.