Cabling and Specifications

•100BASE-FX—100BASE-T, half- and full-duplex over fiber-optic cable.

Note 100BASE-TX and 100BASE-FX are commonly called 100BASE-X rather than 100BASE-T.

•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+. Two-pair UTP over Category 3 cable is called T2.

Note The 8-Port Fast Ethernet line card supports 100BASE-TX and 100BASE-FX. 100BASE-T4 is not supported.

Table 8 lists the cabling specifications for 100 Mbps Fast Ethernet transmission over UTP, STP, and fiber-optic cables. Table 9 summarizes IEEE 802.3u 100BASE-T physical characteristics for 100BASE-TX and 100BASE-FX.

Table 8

Specification and Connection Limits for 100-Mbps Transmission

 

 

 

 

 

 

 

 

Parameter

 

RJ-45

 

 

MII

SC-Type

 

 

 

 

Cable specification

Category 51 UTP2, 22

Category 3, 4, or 5,

62.5/125 multimode

 

 

to 24 AWG3

 

 

150-ohm UTP or STP, or

fiber-optic

 

 

 

 

 

multimode fiber-optic

 

 

 

 

 

 

 

Maximum cable length

–

 

 

1.64 ft (0.5 m) (MII-to-MII

–

 

 

 

 

 

cable4)

 

Maximum segment

328 ft (100 m) for

3.28 ft (1 m)5 or 1,312 ft

2 km

length

 

100BASE-TX

 

 

(400 m) for 100BASE-FX

 

 

 

 

 

 

 

 

Maximum network

656 ft (200 m)

5

(with 1

–

5

 

4 km(with 1

length

 

repeater)

 

 

 

repeater)

 

 

 

 

 

 

 

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 STP MII cables. Both are available commercially.

3.AWG = American Wire Gauge. This gauge is specified by the EIA/TIA-568 standard.

4.This is the cable between the MII port on the FE interface and the appropriate transceiver.

5.This length is specifically between any two stations on a repeated segment.

 

 

 

 

Table 9

IEEE 802.3u Physical Characteristics

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Parameter

 

100BASE-FX

100BASE-TX

 

 

 

 

 

 

 

 

 

 

 

 

Data rate (Mbps)

100

100

 

 

 

 

 

 

 

 

 

 

 

 

Signaling method

Baseband

Baseband

 

 

 

 

 

 

 

 

 

 

 

Maximum segment length

2 km between repeaters

100 m between DTE1 and repeaters

 

 

 

 

(meters)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Media

 

SC-type: dual simplex or single

RJ-45MII

 

 

 

 

 

 

duplex for receive (RX) and

 

 

 

 

 

 

 

 

transmit (TX)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Topology

 

Star or hub

Star or hub

 

 

 

 

 

 

 

 

 

 

 

 

1. DTE = data terminal equipment.

 

 

 

 

 

Cisco XR 12000 Series Router Ethernet Line Card Installation

 

 

 

 

 

 

 

 

42

 

 

 

 

 

OL-7861-01

 

 

 

 

 

 

 

 

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Cisco Systems OL-7861-01 manual RJ-45, SC-Type
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OL-7861-01 specifications

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