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Chapter 3 Topology
Physical Installation
Cisco SCE 1000 2xGBE Installation and Configuration Guide
3-4 OL-7821-05
Bump-in-the-Wire (Inline) Topology
Typically, the SCE 1000 is connected on a full duplex line between two devices (Router, BRAS,
etc.). When the SCE 1000 is installed as a bump-in-the-wire, it physically resides on the data link
between the subscriber side and the network side, and can both receive and transmit traffic.
Figure
3-1: Bump-in-the-Wire Installation
A bump-in-the-wire installation is referred to as inline connection mode.
External Splitting (Receive-only) Topology
In external splitting, an external optical splitter resides physically on the GBE link between the
subscriber side and the network side. In this topology, the traffic passes through the external
splitter, which splits traffic to the SCE 1000. The external splitter is connected to the SCE 1000
via Rx links only. The SCE 1000, therefore, receives traffic only. It does not transmit.
Figure
3-2: External Splitting Topology
An external splitting installation is referred to as receive-only connection mode.
Note that in an external splitting installation, the SCE 1000 has 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.