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Cisco XR 12000 Series Router Ethernet Line Card Installation
OL-7861-01
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 5
1
UTP
2
, 22
to 24 AWG
3
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.
Category 3, 4, or 5,
150-ohm UTP or STP, or
multimode fiber-optic
62.5/125 multimode
fiber-optic
Maximum cable length – 1.64 ft (0.5 m) (MII-to-MII
cable
4
)
4. This is the cable between the MII port on the FE interface and the appropriate transceiver.
–
Maximum segment
length
328 ft (100 m) for
100BASE-TX
3.28 ft (1 m)
5
or 1,312 ft
(400 m) for 100BASE-FX
5. This length is specifically between any two stations on a repeated segment.
2 km
Maximum network
length
656 ft (200 m)
5
(with 1
repeater)
– 4 km
5
(with 1
repeater)
Table 9 IEEE 802.3u Physical Characteristics
Parameter 100BASE-FX 100BASE-TX
Data rate (Mbps) 100 100
Signaling method Baseband Baseband
Maximum segment length
(meters)
2 km between repeaters 100 m between DTE
1
and repeaters
1. DTE = data terminal equipment.
Media SC-type: dual simplex or single
duplex for receive (RX) and
transmit (TX)
RJ-45MII
Topology Star or hub Star or hub