IEEE 802.3u 100BaseT Specifications
PA-FE-TX and PA-FE-FX Fast Ethernet 100BaseT Port Adapter Installation and Configuration
1-10
IEEE 802.3u 100BaseT Specifications
Table 1-3 lists the cabling specifications for 100-Mbps Fast Ethernet transmission over UTP, FTP,
and fiber-optic cables. Table 1-4 summarizes IEEE 802.3u 100BaseT physical characteristics.
Table 1-3
Specifications and Connection Limits for 100-Mbps Transmission
Table 1-4
IEEE 802.3u Physical Characteristics
Parameter
RJ-45
MII
SC-Type
Cable specification
Category 5
1
UTP
2
, 22 to 24 AWG
1
EIA/TIA-568 or EIA-TIA-568 TSB-36 compliant.
2
Cisco Systems does not supply Category 5 UTP RJ-45 or 150-ohm FTP MII cables. Both are available commercially.
Category 3, 4, or 5, 150-ohm UTP or FTP,
or multimode optical fiber
62.5/125 multimode optical
fiber
Maximum cable length
–
1.64 ft (0.5 m) (MII-to-MII cable
3
)
3
This is the cable between the MII port on the PA-FE port adapter and the appropriate transceiver.
–
Maximum segment length
328 ft (100 m) for 100BaseTX
3.28 ft (1 m)
4
or 1,312 ft (400 m) for
100BaseFX
4
This length is specifically between any two stations on a repeated segment.
328 ft (100 m)
Maximum network length
656 ft (200 m)
4
(with 1 repeater)
–
656 ft (200 m)
4
(with 1
repeater)
Parameter
100BaseFX
100BaseTX
Data rate (Mbps)
100
100
Signaling method
Baseband
Baseband
Maximum segment length (meters)
100 m between repeaters
100 m between DTE
1
and repeaters
1
DTE = data terminal equipment.
Media
SC-type: dual simplex or single duplex for Rx and Tx
RJ-45MII
Topology
Star or Hub
Star or Hub
