SMC Networks SMC8848M Connectivity Rules

M AKING N ETWORK C ONNECTIONS
4-8
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 802.3-2002 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