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REVIEW DRAFT—CISCO CONFIDENTIAL
14-8
Cisco ONS 15454 SDH Reference Manual, R5.0
April 2008
Chapter 14 Ethernet Operation
14.2.2 One-Port Bidirectional Transponder
14.2.2 One-Port Bidirectional Transponder
One-port bidirectional transponder mode maps the Ethernet frames received at a port out the transmitter
of the same port (Figure 14-7). 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 transponding mode is not a
maintenance mode and does not suppress non-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, which allows the node to receive on multiple
wavelengths but transmit on a fixed wavelength.
Figure 14-7 One-Port Bidirectional Transponding Mode
14.2.3 Two-Port Unidirectional Transponder
Ethernet frames received at one port’s receiver will be transmitted out the transmitter of another port.
This mode is similar to two-port bidirectional transponder mode except only one direction is used
(Figure 14-8). One port must be provisioned as unidirectional transmit only and the other port must be
provisioned as unidirectional receive. The port configured as unidirectional transmit ignores any missing
signals on the receive port, so the receive port fiber does not need not be connected. The port configured
as unidirectional receive does not turn on the transmit laser so the transmit port fiber does not need to be
connected.
This mode can be used when only one direction needs to be transmitted over CWDM/DWDM, for
example certain video-on-demand (VoD) applications.
90913
G-Series Card
Tx Port
Rx Port
Note:
This configuration can be used when the client
terminal's optical signal is single-mode, 1310 nm,
1550 nm, or 15xx.xx nm.
ONS Node
Cross-Connect
Card
Optical Card
Tx Port
Rx Port
GBIC Standard SX, LX, ZX
GBIC CWDM or DWDM
Ethernet TDM
WDM Lambda 1
WDM Lambda 2
WDM Lambda 3
WDM Lambda 4