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Ethernet Media
4-8 Cabling Types
Twenty-Five Pair Cable
UTP cabling in large installations requiring several cable runs between two points
is often 25-pair cable. This is a heavier, thicker form of UTP. The wires within the
plastic jacket are of the same construction, and are twisted around associated
wires to form pairs, but there are 50 individual wires twisted into 25 pairs in these
larger cables. In most cases, 25-pair cable is used to connect wiring closets to one
another, or to distribute large amounts of cable to intermediate distribution
points, from which four-pair cable is run to the end stations.
Table 4-1. 10BASE-T/100BASE-TX Four-Pair Wire Use
Wire Color EIA/TIA Pair
Ethernet Signal Use
568A 568B
White/Blue (W-BL)
Pair 1 Not Used
Blue (BL)
White/Orange (W-OR)
Pair 2
RX+ TX+
Orange (OR) RX- TX-
White/Green (W-GR)
Pair 3
TX+ RX+
Green (GR) TX- RX-
White/Brown (W-BR)
Pair 4 Not Used
Brown (BR)
NOTE
Do not split pairs in a twisted pair installation. While you may
consider combining your voice and data cabling into one piece
of horizontal facility cabling, the Crosstalk and interference
produced by this practice greatly reduces the viability of the
cable for either application. The use of the pairs of cabling in
this fashion can also prevent the future usage of advanced
networking technologies such as FDDI TP-PMD and
100BASE-T4, that require the use of all four pairs in a twisted
pair cable.
- Cabletron Systems 1
- Cabling Guide 1
- Contents 5
- Chapter 11 FDDI Media 9
- Introduction 11
- 1-2 Document Organization 12
- Document Conventions 13
- Additional Assistance 14
- Related Documentation 14
- Cabling Terms 15
- 2-2 Physical Components 16
- Connector 17
- 2-4 Physical Components 18
- Physical Components 2-5 19
- Test Characteristics 20
- Test Characteristics 2-7 21
- 2-8 Test Characteristics 22
- Relevant Specifications 23
- Ethernet Media 25
- 4-2 Cabling Types 26
- Coaxial Cable 27
- 4-4 Cabling Types 28
- Unshielded Twisted Pair (UTP) 29
- 4-6 Cabling Types 30
- Cabling Types 4-7 31
- 4-8 Cabling Types 32
- Cabling Types 4-9 33
- 4-10 Cabling Types 34
- Cabling Types 4-11 35
- 4-12 Cabling Types 36
- Cabling Types 4-13 37
- Cabling Types 4-15 39
- 4-16 Cabling Types 40
- 4-18 Connector Types 42
- 4-20 Connector Types 44
- Annular Ring 44
- TRANSCEIVER 45
- 4-22 Connector Types 46
- UTP Cable 47
- 4-24 Connector Types 48
- Connector Types 4-25 49
- TransmitTransmit 50
- ReceiveReceive 50
- Connector Types 4-27 51
- Connector Types 4-29 53
- 4-30 Connector Types 54
- Ethernet Network Requirements 55
- Other Considerations 57
- 10BASE-F (Multimode) 58
- Insertion Loss 59
- Ethernet FOIRL (Single Mode) 60
- Termination 62
- Connectors/Taps 62
- 10BASE5 (Coaxial Cable) 63
- Grounding 64
- Full-Duplex Ethernet Network 65
- Requirements 65
- Insertion Loss (Attenuation) 66
- Fast Ethernet Network 73
- 100BASE-FX (Multimode) 76
- Hybrid Installations 77
- Repeater Classes 78
- Buffered Uplinks 79
- 7-8 Hybrid Installations 80
- 8-4 100BASE-TX 84
- 8-6 100BASE-FX (Multimode) 86
- 9-2 Cabling Types 88
- Cabling Types 9-3 89
- 9-4 Cabling Types 90
- 9-6 Cabling Types 92
- Cabling Types 9-7 93
- Cabling Types 9-9 95
- Connector Types 9-11 97
- 9-12 Connector Types 98
- Connector Types 9-13 99
- BK RE GR OR 100
- Unshielded Twisted Pair Cable 101
- Fiber Optics 103
- Token Ring Media 104
- 9-18 Connector Types 104
- Chapter 10 105
- Impedance 106
- Attenuation 106
- Link Length 107
- Trunk Cable Length 108
- Cable Type 109
- Crosstalk 110
- FDDI Media 115
- 11-2 Cabling Types 116
- Cabling Types 11-3 117
- 11-4 Cabling Types 118
- Shielded Twisted Pair (STP) 119
- 11-6 Cabling Types 120
- STP Cable Quality 121
- Cabling Types 11-9 123
- 11-10 Cabling Types 124
- Connector Types 125
- 11-12 Connector Types 126
- 11-14 Connector Types 128
- Connector Types 11-15 129
- 11-16 Connector Types 130
- FDDI Network Requirements 131
- Emitted Power 132
- TP -PMD (UTP) 134
- TP-PMD (STP) 135
- 12-6 TP-PMD (STP) 136
- Cabling Devices 137
- Hardware Mounting 138
- Enclosed Equipment Cabinet 139
- Cable Termination 140
- Harmonica 141
- Punchdown Block 142
- Distribution Box 143
- Wallplate 144
- Facility Cable Management 145
- 12 11 10 9 8 76543 21 147
- Innerduct 148
- Latching Duct 148
- Labeling Tape 149
- Ty-Wraps and Adhesive Anchors 150
- Connecting and Terminating 151
- 14-2 Ethernet 152
- Ethernet 14-3 153
- 14-4 Ethernet 154
- Ethernet 14-5 155
- 14-6 Ethernet 156
- ST Connector 157
- 14-8 Ethernet 158
- Token Ring 159
- 14-10 Token Ring 160
- Token Ring 14-11 161
- Token Ring MIC 162
- 14-14 FDDI 164
- FDDI 14-15 165
- FDDI MIC 166
- FDDI 14-17 167
- SC Connector 168
- FDDI 14-19 169
- 14-20 FDDI 170
- Charts and Tables 171
- A-2 Ethernet 172
- Ethernet A-3 173
- Token Ring A-5 175
- A-6 FDDI 176
- Glossary-1 177
- Attenuation to Card 178
- Glossary-2 178
- Glossary-3 179
- Channel to Crosstalk 179
- CSMA/CD to Dual Attached 180
- Glossary-4 180
- Glossary-5 181
- Dual Homing to FNB 181
- Frame to Interface 182
- Glossary-6 182
- Glossary-7 183
- Internet to MAU 183
- Mbps to NVRAM 184
- Glossary-8 184
- Glossary-9 185
- Octet to Redundant 185
- Relay to SIMM 186
- Glossary-10 186
- Glossary-11 187
- Switch to UTP 188
- Glossary-12 188
- Numerics 189
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