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Watson Ethernet
Operating Manual
Watson-Ethernet-Manual.doc
Version 3.3-01
2-2
Revision: 2010-01-20
modem or a plug-in card in a tabletop housing is installed. Traffic from each cus-
tomer is available at a dedicated Ethernet interface in the central office. Alterna-
tively traffic from several customers can be aggregated to a single Ethernet port.
Advanced VLAN functions allow for customer isolation and traffic management.
Watson Ethernet modems can also be used back-to-back as shown in Figure
2-2:
Figure 2-2: Campus Networks
For these applications either two tabletop modems or two plug-in modems (in an
appropriate housing) are connected back to back with one of the modems being
configured as DSL master and the other one as DSL slave. Depending on the
distance and the number of wire pairs available linerates up to 22.8 MBit/s are
available. VLAN and MAC Address filtering functions allow for traffic manage-
ment and optimal use of the available DSL bandwidth.
Deployment in linear networks is supported with the Watson Ethernet plug-in
card:
Figure 2-3: Linear Ethernet Network
In Figure 2-3 several sites (e.g. stations along a pipeline or a power line) are
connected with single or two pair DSL systems. In each site a single Watson
Ethernet plug-in card terminates the DSL spans coming from "East" and "West"
sides and gives four local Ethernet interfaces e.g. to connect local station control
equipment. Traffic from the local interfaces can be aggregated with traffic on the
DSL and can be sent to either direction along the line. Traffic streams are kept
separate through VLANs, and Class of Service/Priority functions allow for traffic
management.
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