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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