Cisco Systems VIP-FE-TX/4E Podręcznik Użytkownika Pobierz pdf (Strona 30)

30 VIP-FE-TX/4E Installation and Conﬁguration

VIP Port Adapter Functions

The stations detect the collision and use backoff algorithms to determine when they should

retransmit. Both Ethernet and IEEE 802.3u are broadcast networks, which means that all stations see

all transmissions. Each station must examine received frames to determine whether it is the intended

destination and, if it is, pass the frame to a higher protocol layer for processing.

Each physical layer protocol has a name that summarizes it characteristics in the format

speed/signaling method/segment length where speed is the LAN speed in megabits per second

(Mbps), signaling method is the signaling method used (either baseband or broadband), and segment

length is typically the maximum length between stations in hundreds of meters. Therefore,

100BASE-T speciﬁes a 100-Mbps, baseband LAN with maximum network segments of 100 meters

(or 400 meters for 100BASE-FX).

IEEE 802.3u speciﬁes the following different physical layers for 100BASE-T:

• 100BASE-TX—100BASE-T, half and full duplex over Category 5 unshielded twisted-pair

(UTP), Electronics Industry Association/Telecommunications Industry Association

[EIA/TIA]–568-compliant cable

• 100BASE-FX—100BASE-T, half and full duplex over optical ﬁber

• 100BASE-T4—100BASE-T, half and full duplex over Category 3, 4, or 5 UTP or shielded

twisted-pair (STP) cabling with four pairs; also called 4T+ or T2, which is 2-pair UTP over

Category 3 cable.

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Cisco Systems VIP-FE-TX/4E Podręcznik Użytkownika Strona 30