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Chapter 5: Making Network Connections
Figure 5-3. Making Fiber Port connections.
Step 4: As a connection is made, check the Link LED on the switch corresponding to the port to be sure that the connection is
valid.
The fiber optic ports operate at 1 Gbps. The maximum length for fiber optic cable operating at Gigabit speed will depend on the
fiber type as listed under “1000 Mbps Gigabit Ethernet Collision Domain.”
5.4 Connectivity Rules
When adding hubs to your network, note that because switches break up the path for connected devices into separate collision
domains, you should not include the switch or connected cabling in your calculations for cascade length involving other devices.
5.4.1 1000BASE-T Cable Requirements
All Category 5 UTP cables that are used for 100BASE-TX connections should also work for 1000BASE-T, providing that all four
wire pairs are connected. However, we recommend using Category 5e or Category 6 cable for all critical connections, or any new
cable installations. The Category 5e and 6 specifications include test parameters that are only recommendations for Category 5.
Therefore, the first step in preparing existing Category 5 cabling for running 1000BASE-T is a simple test of the cable installation
to be sure that it complies with the IEEE 802.3-2005 standards.
5.4.2 1000-Mbps Gigabit Ethernet Collision Domain
Table 5-1. Maximum 1000BASE-T Gigabit Ethernet cable length.
Cable Type Maximum Cable Length Connector
Category 5, 5e, or 6 100-ohm UTP or STP 328 ft. (100 m) RJ-45
Table 5-2. Maximum 1000BASE-X Gigabit fiber cable lengths.
Fiber Size Fiber Bandwidtch Maximum Cable Length Connector
62.5/125 micron multimode fiber 160 MHz/km
200 MHz/km
722 ft. (220 m)
902 ft. (275 m)
LC
LC
50/125 micron multimode fiber 400 MHz/km
500 MHz/km
1641 ft. (500 m)
1805 ft. (550 m)
LC
LC
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