Configuration Rules for Gigabit Ethernet (SM and TM) 23
Configuration Rules
for Gigabit
Ethernet (SM and
TM)
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.
Ta b le 4
Gigabit Ethernet cabling
Configuration Rules
for the 3300 SM
and TM
The SM Switch has a Gigabit Ethernet fiber optic 1000BASE-SX port
while the TM switch has a 1000BASE-T port. These ports provide 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 3 Switch 3300 SM:
■
Use Multimode fiber optic cable (see Table 4 for details).
■
The 1000BASE-SX port is permanently fixed at 1000Mbps with full
duplex.
FortheSuperstack3Switch3300TM:
■
the maximum UTP cable length is 100m (328ft) over Category 5 cable.
■
The 1000BASE-T 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 µmMM
50 µmMM
50 µmMM
10 µmSM
62.5 µmMM
62.5 µmMM
50 µmMM
50 µmMM
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
1697ua.bk Page 23 Monday, December 3, 2001 11:31 AM
