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Cabling Types 4-9
Ethernet Media
As with four-pair cable, the wires within a 25-pair cable are identified by color.
The jacket of each wire in a 25-pair cable has an overall color: violet, green, brown,
blue, red, orange, yellow, gray, black, and white. In a 25-pair UTP cable all wires
in the cable are identified by two colors. The first color is the base color of the
insulator, while the second is the color of narrow bands painted onto the base
color. These identifying rings are periodically placed on the wire, and repeat at
regular intervals. When a wire is identified in a 25-pair cable, it is identified first
by its base color, and then further specified by the color of the bands or rings.
As a 25-pair cable can be used to make up to 12 connections between Ethernet
stations (two wires in the 25-pair cable are typically not used), the wire pairs need
to be identified not only as transmit or receive pairs, but what other pair they are
associated with. There are two ways of identifying sets of pairs in a 25-pair cable.
The first is based on the connection of a 25-pair cable to a specific type of
connector designed especially for it, the RJ21 connector. The second is based on
connection to a punchdown block, a cable management device typically used to
make the transition from a single 25-pair cable to a series of four-pair cables
easier.
For further information on the RJ21 connector, refer to the Connector Types
section later in this chapter. A description of punchdown blocks may be found in
Chapter 13, Cabling Devices, and details of the punchdowns may be found in the
Connector Types section later in this chapter.
Table 4-2. 25-Pair Cable Pair Mapping
Port Number Wire Use Wire Color
RJ21 Pin
Number
Punchdown
In Number
Punchdown
Out Number
1
RX + White/Blue 26 A1 B1
RX - Blue/White 1 A2 B2
TX + White/Orange 27 A3 B3
TX - Orange/White 2 A4 B4
2
RX + White/Green 28 A5 B5
RX - Green/White 3 A6 B6
TX + White/Brown 29 A7 B7
TX - Brown/White 4 A8 B8
3
RX + White/Gray 30 A9 B9
RX - Gray/White 5 A10 B10
TX + Red/Blue 31 A11 B11
TX - Blue/Red 6 A12 B12
- 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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