One-Port Bidirectional Transponder Mode; Two-Port Unidirectional Transponder Mode - Cisco ONS 15454 SDH Configuration Manual

Chapter 23 E-Series and G-Series Ethernet Operation

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
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.
Figure 23-9
xWDM Lambda 1
xWDM Lambda 2
xWDM Lambda 3
xWDM Lambda 4

Two-Port Unidirectional Transponder Mode

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
unidirectional receive. The port configured as unidirectional transmit ignores any lack of signal 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.
(Figure 23-9). This mode is similar to two-port bidirectional transponder mode except
One-Port Bidirectional Transponder Mode
G-Series Card
GBIC Standard SX, LX, ZX
GBIC CWDM or DWDM
23-10). One port has to be provisioned as unidirectional transmit only and the other port as
Cisco ONS 15454 and Cisco ONS 15454 SDH Ethernet Card Software Feature and Configuration Guide, R8.0
Ethernet TDM
Cross-Connect
Card
ONS Node
Tx Port
Note:
Rx Port
This configuration can be used when the client
Tx Port
terminal's optical signal is single-mode, 1310 nm,
Rx Port
1550 nm, or 15xx.xx nm.
One-Port Bidirectional Transponder Mode
Optical Card
23-11