Cisco Systems 15454 SDH 14.2 G-Series Gigabit Ethernet Transponder Mode

REVIEW DRAFT—CISCO CONFIDENTIAL
14-5
Cisco ONS 15454 SDH Reference Manual, R5.0
April 2008
Chapter14 Ethernet Operation
14.2 G-Series Gigabit Ethernet Transponder Mode
Figure14-3 G-Series Gigabit EtherChannel (GEC) Support
Although the G-Series card does not actively run GEC, it supports the end-to-end GEC func tionality of
attached Ethernet devices. If two Ethernet devices running GEC co nnect through G-Series cards to an
ONS 15454 SDH network, the ONS 15454 SDH side network is transparent to the Ethe rChannel devices.
The EtherChannel devices operate as if they are direct ly connected to each other. Any combination of
G-Series parallel circuit sizes can be used to support GEC th roughput.
GEC provides line-level active redundancy and protection (1:1) for attached Ethernet equipment. It can
also bundle parallel G-Series data links together to provide more a ggregated bandwidth. STP operates
as if the bundled links are one link and permits GEC to utilize these multiple parallel paths. Without
GEC, STP permits only a single non blocked path. GEC can also provide G-Series card-level protection
or redundancy because it can support a group of ports on di fferent cards (or different nodes) so that if
one port or card has a failure, traffic is rerouted over the other po rt or card.
14.2 G-Series Gigabit Ethernet Transponder Mode
The G-Series card can be configured as a transponder. Transponder mode can be used with any G-Series
supported GBIC (SX, LX, ZX, coarse wavelength division multiplexing [CWDM], or dense wavelength
division multiplexing [DWDM]). Figure 14-4 shows a card-level overview of a transponder mode
application.
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