Allied Telesis AT-8400 Series Reference Manual page 43

Here are a few examples to illustrate the feature. In Figure 12, the twisted
pair and GBIC port on two AT-8413 link cards in two different AT-8400
chassis are connected together. If the GBIC ports are providing the active
link, a loss of the link, such as from a defective fiber optic cable, would
cause the line cards to automatically reestablish the link to the two
chassis using the twisted pair ports.
1
PWR
EJECT
Backup Link
Figure 12 AT-8413 Line Card Port Backup - Example 1
2 3 4 5 6
AT-8411 AT-8413 AT-8411 AT-8411 AT-8411
AT-8411
GB/T TX TX
TX TX TX
PWR
PWR PWR PWR PWR
L/A
1000
BASE-X
L/A D/C
10/1001000
BASE-T
LNK ACT
LNK ACT LNK ACT LNK ACT LNK ACT
10 100 10 100 10 100 10 100 10 100
EJECT EJECT EJECT
EJECT EJECT
1
AT-8411
TX
PWR
LNK ACT
10 100
EJECT
AT-8400 Chassis Installation Guide
Active Link
2 3 4 5 6
AT-8413 AT-8411 AT-8411 AT-8411 AT-8411
GB/T TX TX TX TX
PWR PWR PWR PWR PWR
L/A
1000
BASE-X
L/A D/C
10/1001000
BASE-T
LNK ACT LNK ACT LNK ACT LNK ACT
10 100
10 100 10 100 10 100
EJECT EJECT EJECT EJECT EJECT
29