23-10
Ethernet Card Software Feature and Configuration Guide, R7.2
January 2009
Chapter 23 E-Series and G-Series Ethernet Operation
Two-Port Bidirectional Transponder Mode
A G-Series card can be configured either for transponder mod e or as the SONET/SDH default. When
any port is provisioned in transponder mode, the card is in tra nsponder mode and no SONET/SDH
circuits can be configured until every port on the card goes back to SONET/SDH mode. To provision
G-Series ports for transponder mode, refer to the Cisco ONS 15454 Procedure Guide or the
Cisco ONS 15454 SDH Procedure Guide.
All SONET/SDH circuits must be deleted before a G-Series card can be configured in transponder m ode.
An ONS 15454 or ONS 15454 SDH can host the G-Series card configured in transponder mode in any
or all of the 12 traffic slots and supports a maximum of 24 bidirectional or 48 unidirectional lambdas.
A G-Series card configured as a transponder can be in one o f three modes:
Two-port bidirectional transponder mode
One-port bidirectional transponder mode
Two-port unidirectional transponder mode
Two-Port Bidirectional Transponder Mode
Two-port bidirectional transponder mode maps the transmitted and received Ethernet frames of one
G-Series card port into the transmitted and received Ethernet frames of another port (Figure 23-8).
Transponder bidirectional port mapping can be done from any port to any other port on the same card.
One-Port Bidirectional Transponder Mode
One-port bidirectional transponder mode maps the Ethernet frames received at a port out the transmitter
of the same port (Figure 23-9). This mode is similar to two-port bidirectional transponder mode except
that a port is mapped only to itself instead of to another port. Although the data path of the one-port
bidirectional transponder mode is identical to that of a facility loopback, the transponder mode is not a
maintenance mode and does not suppress non-SONET/SDH alarms, such as loss of carrier (CARLOSS).
This mode can be used for intermediate DWDM signal regeneration and to take advantage of the wide
band capability of the CWDM and DWDM GBICs. This allows the node to receive on multiple
wavelengths but transmit on a fixed wavelength.