User's Manual

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Chapter 3: Network Planning
Application Examples
VDSL provides significant savings on network installation, equipment, and service
fees. Internet services operate over existing phone cabling and a minimal amount of
network equipment. The only changes require installing a VDSL CPE (or Gateway
as described in this manual) for each client, and a VDSL switch in the basement or
wiring closet. Internet service can then be provided over a direct Ethernet connectio n
from your ISP. For non-commercial environments, you can run the switch through a
broadband router (such as this Gateway) at the customer’s site. This will allow you
to use a single-user account and ISP sharing to significantly reduce network access
charges.
Using VDSL provides Internet connections of up to 100 Mbps downstream and 100
Mbps upstream at 200 meters. Installation is extremely economical for
multiple-tenant dwellings such as apartment buildings, hotels or school dormitories,
as well as commercial buildings.
VDSL provides multiple-user access to the Internet with benefits including:
• Internet services such as e-mail over faster connections than currently possible
with other options such as cable modem or ADSL
• Multimedia applications such as video and virtual gaming made available to the
broader public for the first time
• Access to corporate intranets at speeds close to that available in the office
• Both local network applications and Internet services are supported for commercial
environments
Networking Concepts
Route Determination
Depending on the transport protocol used, this device can handle traffic as a Layer-2
bridge, using only the physical address stored in the packet’s source and destination
address fields. Or it can forward traffic as a fully functional Layer-3 router, using a
specific route (that is, next hop) for each IP host or subnet that is statically
configured or learned through dynamic routing protocols.
Bridging
When Bridge Mode is selected, the Gateway behaves like a wire directly connecting
your local network to the ISP. The Gateway simply stores the physical address and
corresponding port number of each incoming packet in an address table. This
information is subsequently used to filter packets whose destination address is on