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C
ONNECTIVITY
When adding hubs (repeaters) to your network, please follow the connectivity
rules listed in the manuals for these products. However, 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.
1000BASE-T C
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,
it is recommended that for all critical connections, or any new cable installations,
Category 5e (enhanced Category 5) or Category 6 cable should be used. 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.
1000 M
G
BPS
Table 4: Maximum 1000BASE-T Gigabit Ethernet Cable Length
Cable Type
Category 5, 5e, or 6 100-ohm UTP or STP
Table 5: Maximum 1000BASE-SX Gigabit Ethernet Cable Lengths
Fiber Size
62.5/125 micron
multimode fiber
50/125 micron
multimode fiber
R
ULES
R
ABLE
EQUIREMENTS
E
IGABIT
THERNET
Fiber Bandwidth
160 MHz/km
200 MHz/km
400 MHz/km
500 MHz/km
| Making Network Connections
C
4
HAPTER
C
D
OLLISION
OMAIN
Maximum Cable Length
100 m (328 ft)
Maximum Cable Length
2-220 m (7-722 ft)
2-275 m (7-902 ft)
2-500 m (7-1641 ft)
2-550 m (7-1805 ft)
– 48 –
Connectivity Rules
Connector
RJ-45
Connector
LC
LC
LC
LC
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