SMC Networks SMC8848M manual Connectivity Rules, 1000BASE-T Cable Requirements

MAKING NETWORK CONNECTIONS

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	Maximum Cable	Connector
	Bandwidth	Length
62.5/125 micron	160 MHz/km	2-26 m	LC
single-mode fiber		(7-85 ft.)
62.5/125 micron	200 MHz/km	2-33 m	LC
single-mode fiber		(7-108 ft.)
50/125 micron	400 MHz/km	2-66 m	LC
single-mode fiber		(7-216 ft.)
50/125 micron	500 MHz/km	2-82 m	LC
single-mode fiber		(7-269 ft.)
50/125 micron	2000 MHz/km	2-300 m	LC
single-mode fiber		(7-984 ft.)

4-8