Planet FGSW-2401 User Manual page 17

10Base-T Networks
10Base-T Networks are limited to four hubs between any two nodes. By adding your Ethernet Switch to a network, you can
divide that network into segments with their own collision domains. In other words, you can connect one 10Base-T network with
four hubs to your Ethernet Switch. Then you can connect another 10Base-T network with four hubs to your Ethernet Switch.
Then, you'll have one network with two collision domains, allowing four hubs on each port.
Collision Domain
10M HUB
10M HUB
Node W
100Base-TX Networks
The hub limit of a 100Base-TX network depends on the class of hub in the network. With a Class I hub, the network is limited to
one hub. With a Class II hub, the network is limited to two hubs.
However, you can expand your 100Base-TX network that includes either class of hub by adding a Ethernet Switch. With the
Ethernet Switch added to your 100Base-TX network, you can separate that network into individual segments with their own
collision domains. In other words, you can connect one 100Base-T network with one or two hubs to the Ethernet Switch, and you
can connect another 100Base-TX network with one or two hubs to the Ethernet Switch. Then you'll have one network with two
collision domains.
1000Base-SX Networks
The 1000BASE-X (IEEE 802.3z) Gigabit Ethernet standard was ratified in June 1998, after more than two years of intense effort
within the IEEE 802.3 Ethernet committee. The key objective of the 802.3z Gigabit Ethernet Task Force was to develop a
Gigabit Ethernet standard that encompassed the following:
♦
Allowed half/full-duplex operation at speeds of 1000Mbps
♦
Used the 802.3 Ethernet frame formats
10M HUB
10M HUB
Node X
Switching HUB
Ethernet Switch
Figure 5-1. Expanding your 10Base-T Network
Ethernet Switch
Figure 5-2. Expanding your 100Base-TX network (Class I)
Collision Domain
10M HUB 10M HUB
10M HUB 10M HUB
Node Y Node Z