Allied Telesis AT-S65 - Manual (Page 83)

AT-S65 Management Software User’s Guide
83
When loopback is set for both the port and line sides as in mode 6
(Figure 40), the received optical signal on either side loops back.
Figure 40. Mode 6: Loopback on Port and Line Sides
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
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
received
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
signal received
Line side: optical signal
received