Cisco CE 2000 Platform SCE 2000 4xGBE Installation And Configuration Manual page 31

Chapter 3 Topology
Physical Topologies
Single Link: Inline Topology
Typically, the SCE 2000 is connected in a full duplex GBE link between two devices (Router,
BRAS, etc.). When the SCE 2000 is installed as a bump-in-the-wire, it physically resides on the
data link between the subscribers and the network.
Figure 3-2: Single SCE Platform Single Link: In-line Topology
When configuring the SCE 2000, a bump-in-the-wire installation is referred to as "inline"
connection mode.
Dual link: Inline Installation
In this topology, one SCE 2000 is connected inline in two full duplex, GBE links.
In case the two links are load-shared, asymmetrical routing might occur, and some of the flows
may be split, i.e. the upstream packets of the flow go on one link, and the downstream packets go
on the other link.
When installed in this topology, the SCE 2000 completely overcomes this phenomenon, and
provides its normal functionality as if asymmetrical routing were not occurring in the two links.
Figure 3-3: Single SCE Platform Dual Link Inline Topology
This topology supports both monitoring and control functionality, and is referred to as "inline"
connection mode.
SCE 2000 4xGBE Installation and Configuration Guide
OL-7824-02 3-5