Installation guide

Summary of Features
1-8
Port Redundancy
The AT-8518, AT-8525, and AT-8550 switches have optional redundant Gigabit
Ethernet ports. Using the redundant port, you can dual-home the switch to one or two
switches. Figure 1-5 illustrates a switch dual-homed to two different switches.
Figure 1-5
AT-8525 Dual-Homing Configuration
In the event that the active port fails or loses link status, the redundant port is
automatically activated. When the primary port resumes operation, the redundant port
becomes inactive. This feature can be disabled.
The redundant port cannot be used for load sharing when the primary port is active. If
the primary port becomes inactive, the redundant port is activated in the load sharing
configuration.
POWER
MGMT.
10/100BASE-T ETHERNET SWITCH
WITH GIGABIT ETHERNET
1234
13 14 15 16
5678
17 18 19 20
9101112
21 22 23 24
LINK ON
ACTIVITY
DISABLED
123456
789101112
13 14 15 16 17 18
19 20 21 22 23 24
25
25
25R
25R
A
L
25 25R
1000BASE-X 10/100BASE-TX MDI-X
POWER
MGMT.
10/100BASE-T ETHERNET SWITCH
WITH GIGABIT ETHERNET
1234
13 14 15 16
5678
17 18 19 20
9101112
21 22 23 24
LINK ON
ACTIVITY
DISABLED
123456
789101112
13 14 15 16 17 18
19 20 21 22 23 24
25
25
25R
25R
A
L
25 25R
1000BASE-X 10/100BASE-TX MDI-X
POWER
MGMT.
10/100BASE-T ETHERNET SWITCH
WITH GIGABIT ETHERNET
1234
13 14 15 16
5678
17 18 19 20
9101112
21 22 23 24
LINK ON
ACTIVITY
DISABLED
123456
789101112
13 14 15 16 17 18
19 20 21 22 23 24
25
25
25R
25R
A
L
25 25R
1000BASE-X 10/100BASE-TX MDI-X
POWER
MGMT.
10/100BASE-T ETHERNET SWITCH
WITH GIGABIT ETHERNET
1234
13 14 15 16
5678
17 18 19 20
9101112
21 22 23 24
LINK ON
ACTIVITY
DISABLED
123456
789101112
13 14 15 16 17 18
19 20 21 22 23 24
25
25
25R
25R
A
L
25 25R
1000BASE-X 10/100BASE-TX MDI-X