Allied Telesis AT-S65 - Manual (Page 80)

Chapter 5: Working With Line Cards
80
Figure 37 describes mode #3. When missing link is enabled for the port
(SFP) side and disabled for the WDM (line side). When the port side does
not receive an optical signal (Case A), the WDM (line side) signal loops
back to the line side.
Figure 37. Mode 3: Missing Link Enabled for Port Side and Disabled for
Line Side
CWDM
Transciever
SFP
Line
Side
Port
Side
CWDM
Transciever
SFP
Line
Side
Port
Side
CWDM
Transciever
SFP
Line
Side
Port
Side
CWDM
Transciever
SFP
Line
Side
Port
Side
X
X
X
X
X X
X X
X X
Legend
No optical signal
Optical signal present
Case B:
Port side: optical
signal received
Line side: optical
signal received Case C:
Port side: optical signal
receovedt
Line side: no optical
signal received Case D:
Port side: no optical
signal received
Line side: no optical
signal received Case A:
Port side: no optical
received
Line side: optical signal
received