CONNECTIVITY RULES
When adding hubs to your network, please 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
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, it is
recommended that for all critical connections, or any
new cable installations, Category 5e 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 MBPS GIGABIT ETHERNET COLLISION DOMAIN
Maximum 1000BASE-T Gigabit Ethernet Cable Length
Cable Type
Maximum Cable Length
Connector
Category 5, 5e or 6 100-ohm
UTP or STP
100.m (328 ft)
RJ-45
Table 6: Maximum 1000BASE-SX Gigabit Fiber Cable Lengths
Fiber Size
Fiber Bandwidth
Maximum Cable Length
Connector
62.5/125 micron
multimode fiber
160 MHz/km
200 MHz/km
220 m (722 ft)
275 m (902 ft)
LC
LC
50/125 micron
multimode fiber
400 MHz/km
500 MHz/km
500 m (1641 ft)
550 m (1805 ft)
LC
LC
Maximum 1000BASE-LX/LHX/XD/ZX Gigabit Fiber Cable Length
Fiber Size
Fiber Bandwidth
Maximum Cable Length
Connector
9/125 micron
single-mode fiber
1310nm
N/A
10km (6.2 miles)
LC
9/125 micron
single-mode fiber
1550nm
N/A
30km (18.64 miles)
50km (31.06 miles)
LC
LC
Maximum 1000BASE-LX Single Fiber Gigabit Fiber Cable Length
Fiber Size
Fiber Bandwidth
Maximum Cable Length
Connector
Single-mode
TX-1310nm
RX-1550nm
N/A
20km (12.42miles)
BIDI
LC
Single-mode
TX-1550nm
RX-1310nm
N/A
20km (12.42miles)
BIDI
LC
Publication date: Oct, 2015
Revision A1
23