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Making Network Connections
4
Connectivity Rules
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 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 (enhanced Category 5) or Category 6 cable should be used. The
Category 5e specification includes 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.
10 Gbps Ethernet Collision Domain
Table 4-1 Maximum 10GBASE-SR 10 Gigabit Ethernet Cable Length
Fiber Size Fiber Bandwidth Maximum Cable Length Connector
62.5/125 micron
single-mode fiber
160 MHz/km 2-26 m
(7-85 ft.)
LC
62.5/125 micron
single-mode fiber
200 MHz/km 2-33 m
(7-108 ft.)
LC
50/125 micron
single-mode fiber
400 MHz/km 2-66 m
(7-216 ft.)
LC
50/125 micron
single-mode fiber
500 MHz/km 2-82 m
(7-269 ft.)
LC
50/125 micron
single-mode fiber
2000 MHz/km 2-300 m
(7-984 ft.)
LC
Table 4-2 Maximum 10GBASE-LR 10 Gigabit Ethernet Cable Length
Fiber Size Fiber Bandwidth Maximum Cable Length Connector
9/125 micron
single-mode fiber
N/A 10 km (6.2 miles) LC
Table 4-3 Maximum 10GBASE-ER 10 Gigabit Ethernet Cable Length
Fiber Size Fiber Bandwidth Maximum Cable Length Connector
9/125 micron
single-mode fiber
N/A 40 km (24.85 miles) LC