Collapsed Backbone; Figure 5. Collapsed Backbone - Hub Topology - Allied Telesis AT-9000/24 Installation Manual

Collapsed
Backbone
AT-9000/24
24 Port Gigabit Ethernet Switch
1 3 5 7
POWER 2 4 6 8 10
AT-GS950/16 Switch
AT-GS950/16
16-Port 10/100/1000Mbps + 2 SFP Combo WebSmart Switch
1 3 5 7 9 11 13 15
SPEED
LINK/ACT
SPEED
LINK/ACT LINK/ACT
POWER 2 4 6 8 10 12 14 16 15 16
Legend
10 Mbps
100 Mbps
1000 Mbps
In the topology illustrated in Figure 5, an AT-9000/24 Gigabit Ethernet
Switch connects Fast Ethernet switches that have Gigabit Ethernet
uplinks. This type of topology is often referred to as a collapsed backbone
topology. The switch functions as the focal point of the network and
transfers an Ethernet frame between the Fast Ethernet and Gigabit
Ethernet switches only when the destination end node for the frame is on a
different switch than the end node that originated the frame. This reduces
the amount of unnecessary data traffic in each workgroup, freeing up
bandwidth and improving network performance.
AT-9000/24 Switch
PORT ACTIVITY
1000 10/100
LINK ACT
SFP
9 11 13 15 17 19 21R 23R
21 22
12 14 16 18 20 22R 24R 23 24
AT-GS950/8 Switch
731

Figure 5. Collapsed Backbone - Hub Topology

AT-9000/24 Layer 2 Gigabit Ethernet Switch Installation Guide
793
AT-8000/8POE Switch
AT-8000/8POE 1 3 5 7 MAIN PORT ACTIVITY
DET ON ON
PD ON PD ERR
8 Port POE Fast Ethernet Switch
100 LINK ACT 10 LINK
PoE
9
UPLINK PORT ACTIVITY
1000 LINK
10/100 LINK
POWER
2 4 6 8 9R
912
Wireless Network
1 3 5 7
UPLINK PORT
MAX CURRENT
ACT
10/100/1000 Base-T
SFP
ACT
CLASS 1
ACT LASER PRODUCT
2 4 6 8 9R 9
820
301
27