User guide

Chapter 4 Installation and Startup
Connecting the line ports to the network
SCE 1000 2xGBE Release 2.0.10 User Guide
OL-7117-02 4-49
Bump-in-the-Wire (Inline) Topology
Figure 4-19: Bump-in-the-Wire Installation
In bump-in-the-wire topology (see the above figure), 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 bump-in-the-wire topology, all the traffic of the SCE 1000 is deployed as a transparent layer2
overlay on the customer’s existing network.
External Optical Splitter (Receive-only) Topology
In external splitting, 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.
Note
Receive-only topologies can also be implemented using a switch. Such a switch must support SPAN
functionality that includes separation between ingress and egress traffic and multiple SPAN-ports
destinations.