Cisco ONS 15454 SDH Specifications Page 351

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9-5
Cisco ONS 15454 SDH Installation and Operations Guide, R3.3
May 2002
Chapter 9 Ethernet Operation
G1000-4 Card
Although the G1000-4 card does not actively run GEC, it supports the end-to-end GEC functionality of
attached Ethernet devices. If two Ethernet devices running GEC connect through G1000-4 cards to an
ONS 15454 SDH network, the ONS 15454 SDH side network is transparent to the EtherChannel devices.
The EtherChannel devices operate as if they are directly connected to each other. Any combination of
G1000-4 parallel circuit sizes can be used to support GEC throughput.
GEC provides line-level active redundancy and protection (1:1) for attached Ethernet equipment. It can
also bundle parallel G1000-4 data links together to provide more aggregated bandwidth. STP operates
as if the bundled links are one link and permits GEC to utilize these multiple parallel paths. Without
GEC, STP only permits a single non-blocked path. GEC can also provide G1000-4 card-level protection
or redundancy because it can support a group of ports on different cards (or different nodes) so that if
one port or card has a failure, then traffic is re-routed over the other port or card.
9.1.5 G1000-4 LEDs
G1000-4 series Ethernet card faceplates have two card-level LEDs and a bicolored LED next to each port
(Figure 9-4).
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