Cisco SCE 1000 Installation And Configuration Manual page 90

Connecting the line ports to the network
Single Link: Inline Topology
Figure 6-1: Bump-in-the-Wire Installation
In the inline or bump-in-the-wire topology, illustrated in the diagram above, the SCE 1000 resides
physically on the data link between the subscriber side, usually either a BRAS (in DSL access), a
PDSN (in wireless access), a CMTS (in the Cable access), or a switch or router aggregator (in
other topologies), and the network side, usually a router or layer 3 switch network element. This is
the inline topology, providing both traffic monitoring and control capabilities.
In this topology, all the traffic of the SCE 1000 is deployed as a transparent layer2 overlay on the
customer's existing network.
Single Link: Receive-only Topology
In this topology, an external optical splitter resides physically on the GBE link between the
subscriber side and the network side. The external splitter is connected to the SCE 1000 via Rx
links only.
In this topology, the traffic passes through the external splitter, which splits traffic to the SCE
1000. The SCE 1000, therefore, is in receive-only topology, having only traffic monitoring
capabilities.
Receive-only topologies can also be implemented using a switch. Such a switch must support SPAN
Note
functionality that includes separation between ingress and egress traffic and multiple SPAN-ports
destinations.
Cisco SCE 1000 2xGBE Installation and Configuration Guide
6-2
Chapter 6 Cabling the Line Ports and Completing the Installation
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