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Chapter 3 Topology
Physical Topologies
SCE 2000 4xGBE Installation and Configuration Guide
3-8 OL-7824-02
SCE 2000 Configuration
There are four topology-related parameters:
• Connection mode: Can be any one of the following, depending on the physical installation of
the SCE 2000:
• Inline: single SCE 2000 inline
• Receive-only: single SCE 2000 receive-only
• Inline-cascade: two SCE 2000s inline
• Receive-only-cascade: two SCE 2000s receive-only
• Physically-connected-links: In cascaded configurations, this parameter defines the number of
the link connected to this SCE 2000.
It is applicable only in a cascade topology.
• Priority: This parameter defines which SCE 2000 platform is the primary device.
It is applicable only in a cascade topology.
• On-failure: This parameter determines whether the system cuts the traffic or bypasses it when
the SCE 2000 either has failed or is booting. It is not applicable to receive-only topologies.
Any of these parameters may be configured via either the setup command or the
connection-mode command.
Connection Mode Parameter
The connection mode parameter refers directly to the physical topology in which the SCE 2000 is
installed. The connection mode depends on two factors:
• Inline/Receive-only:
• Inline: The SCE 2000 resides on the data link between the subscriber side and the
network side, thus both receiving and transmitting packets.
• Receive-only: The SCE 2000 does not reside physically on the data link. Data is
forwarded to the SCE 2000 via an external switch. The SCE 2000 itself receives only and
does not transmit.
• Cascade: Indicates a two SCE 2000 topology where the SCE 2000 platforms are connected
via the cascade ports.
The connection mode parameter is determined by the physical deployment of the SCE 2000, as
follows:
• Single SCE 2000 bump-in-the-wire installation = “Inline” connection mode.
• Single SCE 2000 optical splitter installation = “Receive-only” connection mode.
• Two SCE 2000 bump-in-the-wire installation = “Inline-cascade” connection mode.
• Two SCE 2000 optical splitter installation = “Receive-only-cascade” connection mode.