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30 VIP-FE-TX Installation and Conﬁguration

FE-TX Port Adapter Functions

The following sections discuss the FE-TX port adapter, which is shown in Figure 14.

• Fast Ethernet Overview

• FE-TX Port Adapter Description and Fast Ethernet Speciﬁcations, page 31

• FE-TX Port Adapter LEDs, page 32

• FE-TX Port Adapter Receptacles, Cables, and Pinouts, page 33

• Attaching FE-TX Port Adapter Interface Cables, page 36

• Selecting Chassis Slot, Port Adapter, and Fast Ethernet Interface Port Numbers, page 38

• Conﬁguring the FE-TX Port Adapters—Descriptions and Examples, page 40

Figure 14 FE-TX Port Adapter, Faceplate View

Fast Ethernet Overview

The VIP conﬁgured with one FE-TX port adapter provides a 100-Mbps, 100BASE-T, Fast Ethernet

interface. Each 100BASE-T port on the FE-TX port adapter has an RJ-45 connector to attach to

Category 5 unshielded twisted-pair (UTP) for 100BASE-TX, and a MII connector that permits

connection through external transceivers to multimode ﬁber for 100BASE-FX, or to Category 3, 4,

and 5 UTP or shielded twisted-pair (STP) for 100BASE-T4 physical media.

Both full-duplex and half-duplex operation are supported.The term Ethernet is commonly used for

all carrier sense multiple access/collision detection (CSMA/CD), local-area networks (LANs) that

generally conform to Ethernet speciﬁcations, including IEEE 802.3u.

Note 100BASE-TX is intended for Environment A and 100BASE-FX is intended for

Environment B.

IEEE 802.3u is well suited to applications where a local communication medium must carry

sporadic, occasionally heavy trafﬁc at high peak data rates. Stations on a CSMA/CD LAN can access

the network at any time. Before sending data, the station listens to the network to see if it is already

in use. If it is, the station waits until the network is not in use, then transmits; this is half-duplex

operation. A collision occurs when two stations listen for network trafﬁc, hear none, and transmit

very close to simultaneously. When this happens, both transmissions are damaged, and the stations

must retransmit. 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.

H4495

ENABLED

MII

LINK

RJ45

FAST ETHERNET

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