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22 C
HAPTER
1: I
NTRODUCING
THE
S
WITCH
3300 SM
Configuration Rules
for Gigabit
Ethernet
Gigabit Ethernet is designed to run over four media:
■
Single-mode fiber optic cable, with connections up to 5km.
■
Multimode fiber optic cable, with connections up to 550m.
■
Balanced, shielded copper cabling, with connections up to 25m.
■
Category 5 cabling, with connections up to 100m.
Table 4
Gigabit Ethernet cabling
Configuration Rules
for the 3300 SM
The Switch has a Gigabit Ethernet fiber optic 1000BASE-SX port that
provides a 1000Mbps full duplex connection to another Gigabit Ethernet
device. Full duplex allows packets to be transmitted and received
simultaneously and, in effect, doubles the potential throughput of a link.
For the SuperStack II Switch 3300 SM:
■
Use Multimode fiber optic cable (see Tab le 4 for details).
■
The 1000BASE-SX port is permanently fixed at 1000Mbps with full
duplex.
Gigabit Ethernet
Transceivers
Fiber Type
Modal
Bandwidth
(MHz/km)
Lengths Supported
Specified by IEEE
(meters)
1000BASE-LX
1000BASE-SX
1000BASE-CX
1000BASE-T
MM = Multimode
62.5 µm MM
50 µm MM
50 µm MM
10 µm SM
62.5 µm MM
62.5 µm MM
50 µm MM
50 µm MM
N/A
N/A
SM = Single-mode
500
400
500
N/A
160
120
400
500
N/A
N/A
2–550
2–550
2–550
2–5000
2–220
2–275
2–500
2–550
25
100