3 • Bridged data application
Models 3224 G.SHDSL IpDSLAM & 6081RC NAS Applications Guide
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Introduction
Introduction
In bridged Ethernet applications, the IpDSLAM, and EdgeRoute Network Access Server incorporated in Pat-
ton ForeFront system, function as an Ethernet hub for interconnecting G.SHDSL access lines and an Ethernet
LAN. Functioning as a hub, they deliver data traffic to and from all interfaces (Subscriber ports and one Ether-
net LAN interface) by means of Ethernet bridging at the data link layer—layer 2 of the Open Systems Inter-
connection (OSI) model. The IpDSLAM and EdgeRoute Network Access Server use bridging control protocol
(BCP) to provide the bridging function. The IpDSLAM and EdgeRoute Network Access Server use point-to-
point protocol (PPP) for data delivery across the G.SHDSL links, by encapsulating each BCP datagram in a
PPP frame.
Figure 11. Model 3324 bridged data application diagram
In general, network engineers may find the Ethernet bridging configuration useful for any data communica-
tion system requiring long-range connections between remote devices and an Ethernet LAN at a central loca-
tion. (See
figure 11
for Model 3224 bridged data application diagram and
figure 12
on page 19 for the Model
6081RC diagram.) As a more specific example, a bridged Ethernet solution may be used when implementing
such a real-world application as Internet Service for small and home based businesses. In such a scenario, mini
LANs supporting from 1 to 50 users would be connected via a G.SHDSL line to the IpDSLAM, and EdgeR-
oute Network Access Server (using 3096RC cards), which would then provide bridged communications with
servers and Internet gateways connected to the main LAN.
