Specifications

10BASE5 Ethernet Network Design
7-4 Ethernet Network Design
Figure 7-4. Multi-port Transceiver
Multi-port Transceiver Rules
When multi-port transceivers are used, two rules must be observed:
1. Multi-port transceivers can be cascaded by connecting the male
connector of one multi-port transceiver to the female connector of a
second multi-port transceiver. However, cascading more than two
multi-port transceivers will result in unacceptable amounts of jitter,
causing alignment errors on the network to occur.
2. The maximum length of a standard AUI cable is 50 m. This maximum
length is reduced by 10 m for each multi-port transceiver that the
signal must pass through. In other words, if two multi-port
transceivers are cascaded, only 30 m total of AUI cable between them,
the device, and the coaxial tap, is allowed.
You can now see how it would be possible to construct a 10BASE5
Ethernet network that would support the IEEE maximum of 1,024 devices.
By using cascaded multi-port transceivers it is possible to have up to a
maximum of 64 user devices per coaxial tap point. See Figure 7-5.
AC
1
2
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5
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7
8
Network
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TRANSCEIVER
22 22 22 22 22 22
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22
To Network Devices
Coaxial Backbone
Multi-port Transceiver
1913-21