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REVIEW DRAFT—CISCO CONFIDENTIAL
14-7
Cisco ONS 15454 SDH Reference Manual, R5.0
April 2008
Chapter 14 Ethernet Operation
14.2.1 Two-Port Bidirectional Transponder
In transponder mode, the G-Series Ethernet traffic never comes into contact with the cross-connect card
or the SDH network, but stays internal to the G-Series card and is routed back to a GBIC on that card
(Figure 14-6).
Figure 14-6 G-Series Card in Transponder Mode (Two-Port Bidirectional)
A G-Series card can either be configured for transponding mode or as the SDH default. Once any port
is provisioned in transponding mode, the card is in transponding mode and no SDH circuits can be
configured until every port on the card goes back to SDH mode. Refer to the Cisco ONS 15454 SDH
Procedure Guide for instructions on how to provision G-Series ports for transponder mode.
All SDH circuits must be deleted before a G-Series card can be configured in transponding mode. An
ONS 15454 SDH can host the card in any of the twelve traffic slots on the ONS 15454 SDH and supports
a maximum of 24 bidirectional or 48 unidirectional lambdas.
A G-Series card configured as a transponder can be in one of three modes:
• Two-port bidirectional transponding mode
• One-port bidirectional transponding mode
• Two-port unidirectional transponding mode
14.2.1 Two-Port Bidirectional Transponder
Two-port bidirectional transponder mode maps the transmitted and received Ethernet frames of one
G-Series card port into the transmit and receive of another port (Figure 14-6). Transponder bidirectional
port mapping can be between any two ports on the same card.
90911
G-Series Card
Tx Port
Rx Port
ONS Node
Cross-Connect
Card
Optical Card
Tx Port
Rx Port
GBIC Standard SX, LX, ZX
GBIC CWDM or DWDM
Ethernet TDM
xWDM Lambda1
xWDM Lambda 2