Allied Telesis AT-SBx31CFC960 - Manual (Page 239)

SwitchBlade x3106 Chassis Switch and AT-SBx31CFC960 Card Installation Guide
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and network device. The devices must be transmitting and
receiving on opposite wavelengths. For example, if the fiber port on
the CSFP transceiver transmits at 1550 nm and receives at 1310
nm, than the port on the remote network device must transmit at
1310 nm and receive at 1550 nm.