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Reference Manual for the Model Wireless ADSL Firewall Router DG834G
9-10
Troubleshooting
202-10006-05, June 2005
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Technical Specifications
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202-10006-05, June 2005
Appendix A
Technical Specifications
This appendix provides technical specifications for the DG834G Wireless ADSL Firewall Router.
Network Protocol and Standards Compatibility
Data and Routing Protocols:
TCP/IP, RIP-1, RIP-2, DHCP, PPP over Ethernet (PPPoE) or
PPP over ATM (PPPoA), RFC 1483 Bridged or Routed
Ethernet, and RFC 1577 Classical IP over ATM
Power Adapter
North America:
120V, 60 Hz, input
United Kingdom, Australia:
240V, 50 Hz, input
Europe:
230V, 50 Hz, input
Japan:
100V, 50/60 Hz, input
All regions (output):
15 V AC @ 1.0A output, 30W maximum
Physical Specifications
Dimensions:
10" x 6.7" x 1.3"
255 mm x 169 mm x 34 mm
Weight:
1.4 lbs.
0.62 kg
Environmental Specifications
Operating temperature:
0
°
to 40
°
C
(32º to 104º F)
Operating humidity:
90% maximum relative humidity, noncondensing
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Reference Manual for the Model Wireless ADSL Firewall Router DG834G
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Technical Specifications
202-10006-05, June 2005
Electromagnetic Emissions
Meets requirements of:
FCC Part 15 Class B
VCCI Class B
EN 55 022 (CISPR 22), Class B
Interface Specifications
LAN:
10BASE-T or 100BASE-Tx, RJ-45
WAN:
ADSL, Dual RJ-11, pins 2 and 3
T1.413, G.DMT, G.Lite
ITU Annex A or B
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Network and Routing Basics
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202-10006-05, June 2005
Appendix B
Network and Routing Basics
This chapter provides an overview of IP networks and routing.
Related Publications
As you read this document, you may be directed to various RFC documents for further
information. An RFC is a Request For Comment (RFC) published by the Internet Engineering
Task Force (IETF), an open organization that defines the architecture and operation of the Internet.
The RFC documents outline and define the standard protocols and procedures for the Internet. The
documents are listed on the World Wide Web at
www.ietf.org
and are mirrored and indexed at
many other sites worldwide.
Basic Router Concepts
Large amounts of bandwidth can be provided easily and relatively inexpensively in a local area
network (LAN). However, providing high bandwidth between a local network and the Internet can
be very expensive. Because of this expense, Internet access is usually provided by a slower-speed
wide-area network (WAN) link such as a cable or DSL modem. In order to make the best use of the
slower WAN link, a mechanism must be in place for selecting and transmitting only the data traffic
meant for the Internet. The function of selecting and forwarding this data is performed by a router.
What is a Router?
A router is a device that forwards traffic between networks based on network layer information in
the data and on routing tables maintained by the router. In these routing tables, a router builds up a
logical picture of the overall network by gathering and exchanging information with other routers
in the network. Using this information, the router chooses the best path for forwarding network
traffic.
Routers vary in performance and scale, number of routing protocols supported, and types of
physical WAN connection they support. The DG834G Wireless ADSL Firewall Router is a small
office router that routes the IP protocol over a single-user broadband connection.
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Reference Manual for the Model Wireless ADSL Firewall Router DG834G
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Network and Routing Basics
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Routing Information Protocol
One of the protocols used by a router to build and maintain a picture of the network is the Routing
Information Protocol (RIP). Using RIP, routers periodically update one another and check for
changes to add to the routing table.
The DG834G wireless router supports both the older RIP-1 and the newer RIP-2 protocols.
Among other improvements, RIP-2 supports subnet and multicast protocols. RIP is not required
for most home applications.
IP Addresses and the Internet
Because TCP/IP networks are interconnected across the world, every machine on the Internet must
have a unique address to make sure that transmitted data reaches the correct destination. Blocks of
addresses are assigned to organizations by the Internet Assigned Numbers Authority (IANA).
Individual users and small organizations may obtain their addresses either from the IANA or from
an Internet service provider (ISP). You can contact IANA at www.iana.org.
The Internet Protocol (IP) uses a 32-bit address structure. The address is usually written in dot
notation (also called dotted-decimal notation), in which each group of eight bits is written in
decimal form, separated by decimal points.
For example, the following binary address:
11000011
00100010
00001100
00000111
is normally written as:
195.34.12.7
The latter version is easier to remember and easier to enter into your computer.
In addition, the 32 bits of the address are subdivided into two parts. The first part of the address
identifies the network, and the second part identifies the host node or station on the network. The
dividing point may vary depending on the address range and the application.
There are five standard classes of IP addresses. These address classes have different ways of
determining the network and host sections of the address, allowing for different numbers of hosts
on a network. Each address type begins with a unique bit pattern, which is used by the TCP/IP
software to identify the address class. After the address class has been determined, the software
can correctly identify the host section of the address. The follow figure shows the three main
address classes, including network and host sections of the address for each address type.

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