RJ45 & Fiber Pinout Reference Guide
Visual color charts and pinout layouts for Ethernet twisted pair cabling (T568A/T568B, Crossover, Rollover) and popular fiber optic connectors.
T568B Standard (Common)
T568A Standard
Crossover Cable
Console (Rollover)
Fiber Connectors
Cable Standards & Specs
T568B RJ45 Pinout (Standard Patch Cable)
Standard color-coding used for the vast majority of patch cords and structured cabling drops.
T568B Wire Sequence Table
Pin
Wire Color
Signal
Function
1 Orange / White TX+ Transmit Positive 2 Orange TX- Transmit Negative 3 Green / White RX+ Receive Positive 4 Blue Unused PoE / Alt Power 5 Blue / White Unused PoE / Alt Power 6 Green RX- Receive Negative 7 Brown / White Unused PoE / Alt Power 8 Brown Unused PoE / Alt Power
T568A RJ45 Pinout (Standard Legacy/Residential)
Often used in residential wiring and older government specifications.
T568A Wire Sequence Table
Pin
Wire Color
Signal
Function
1 Green / White TX+ Transmit Positive 2 Green TX- Transmit Negative 3 Orange / White RX+ Receive Positive 4 Blue Unused PoE / Alt Power 5 Blue / White Unused PoE / Alt Power 6 Orange RX- Receive Negative 7 Brown / White Unused PoE / Alt Power 8 Brown Unused PoE / Alt Power
Ethernet Crossover Cable Pinout
Connects like-devices directly (e.g. computer to computer, switch to switch). Side A is T568A, Side B is T568B.
Side A (T568A)
Pin Link
Side B (T568B)
Pin 1 (Green/White) ↔ Pin 3 (Green/White) Pin 2 (Green) ↔ Pin 6 (Green) Pin 3 (Orange/White) ↔ Pin 1 (Orange/White) Pin 4 (Blue) ↔ Pin 4 (Blue) Pin 5 (Blue/White) ↔ Pin 5 (Blue/White) Pin 6 (Orange) ↔ Pin 2 (Orange) Pin 7 (Brown/White) ↔ Pin 7 (Brown/White) Pin 8 (Brown) ↔ Pin 8 (Brown)
Console / Rollover Cable (Cisco Standard)
Connects a serial port console server to a router or switch management port. Pins are completely reversed from one end to the other.
Connector End A
Link
Connector End B
Pin 1 ↔ Pin 8 Pin 2 ↔ Pin 7 Pin 3 ↔ Pin 6 Pin 4 ↔ Pin 5 Pin 5 ↔ Pin 4 Pin 6 ↔ Pin 3 Pin 7 ↔ Pin 2 Pin 8 ↔ Pin 1
Fiber Optic Connectors Quick Guide
Common connector specifications used in standard patch frames and networking modules.
Connector Interfaces
LC (Lucent Connector) Small Form Factor (SFF)
SC (Subscriber Connector) Square Push-Pull Snap
ST (Straight Tip) Round Bayonet Twist
FC (Ferrule Connector) Round Threaded Screw
MPO (Multi-Fiber Push-On) Ribbon Array (12/24 cores)
Standard Color Conventions (TIA-598)
Yellow Boot/Cable Single-Mode (SM) OS1/OS2
Aqua Boot/Cable Multi-Mode (MM) OM3/OM4
Orange Boot/Cable Multi-Mode (MM) OM1/OM2
Green Connector (APC) Angled Physical Contact (8° angle)
Blue Connector (UPC) Ultra Physical Contact (Flat polish)
Cable Standards & Technical Specifications
Complete comparison references for copper twisted-pair categories, coaxial cable types, and fiber optic transmission classifications.
Ethernet Twisted Pair Categories
Category
Type
Max Speed
Max Bandwidth
Max Distance
Primary Application / Base-T
Cat 1 UTP
< 1 Mbps
0.4 MHz
N/A
Legacy Telephone Lines (POTS), doorbells
Cat 2 UTP
4 Mbps
4 MHz
100 m
Legacy Token Ring networks
Cat 3 UTP
10 Mbps
16 MHz
100 m
10Base-T Ethernet, voice cabling
Cat 4 UTP
16 Mbps
20 MHz
100 m
Token Ring / legacy 10Base-T
Cat 5 UTP
100 Mbps
100 MHz
100 m
100Base-TX (Fast Ethernet)
Cat 5e UTP / STP
1 Gbps
100 MHz
100 m
1000Base-T (Gigabit Ethernet) - Standard patch
Cat 6 UTP / STP
10 Gbps
250 MHz
55 m (10G) / 100 m (1G)
1000Base-T / 10GBase-T (Short length runs)
Cat 6a F/UTP / S/FTP
10 Gbps
500 MHz
100 m
10GBase-T (Structured server/datacenter drops)
Cat 7 S/FTP (Shielded)
10 Gbps
600 MHz
100 m
10GBase-T (Class F; GG45 / TERA proprietary plug)
Cat 7a S/FTP (Shielded)
40 / 100 Gbps
1000 MHz
50 m (40G) / 15 m (100G)
High-frequency industrial / server backplane drops
Cat 8 S/FTP (Shielded)
25 / 40 Gbps
2000 MHz
30 m / 36 m
25GBase-T / 40GBase-T (Datacenter Switch-to-Server)
Twisted Pair Shielding Code Naming (ISO/IEC 11801)
Structured cable designations are formatted as [Overall Shield] / [Pair Shield] TP (Twisted Pair):
U/UTP Unshielded overall / Unshielded pairs
F/UTP Foil shield overall / Unshielded pairs
U/FTP Unshielded overall / Foil shielded pairs
S/FTP Braid screen overall / Foil shielded pairs
F/FTP Foil shield overall / Foil shielded pairs
Coaxial Cable Specifications
RG Type
Impedance
Core Gauge
Common Applications
RG-59 75 Ω
22 AWG
Analog CCTV, short baseband video
RG-6 75 Ω
18 AWG
Cable TV (CATV), digital satellite modems
RG-11 75 Ω
14 AWG
Long-run trunk lines, outdoor link entries
RG-58 50 Ω
20 AWG
Thinnet Ethernet (10Base2), RF antennas
Fiber Optic Classifications
Standard
Fiber Mode
Core/Cladding Size
Light Source
Max Speed & Length Specifications
OS1 Single-Mode (SM)
9 / 125 μm
Laser (1310 / 1550 nm)
10 Gbps up to 2 km (High internal attenuation)
OS2 Single-Mode (SM)
9 / 125 μm
Laser (1310 / 1550 nm)
10G / 40G / 100G up to 10 km - 40 km (Low water peak)
OM1 Multi-Mode (MM)
62.5 / 125 μm
LED (850 / 1300 nm)
1 Gbps up to 275 m / 10 Gbps up to 33 m
OM2 Multi-Mode (MM)
50 / 125 μm
LED (850 / 1300 nm)
1 Gbps up to 550 m / 10 Gbps up to 82 m
OM3 Multi-Mode (Laser Opt.)
50 / 125 μm
VCSEL Laser (850 nm)
10 Gbps up to 300 m / 40G & 100 Gbps up to 100 m
OM4 Multi-Mode (Laser Opt.)
50 / 125 μm
VCSEL Laser (850 nm)
10 Gbps up to 400 m / 40G & 100 Gbps up to 150 m
OM5 Multi-Mode (WBMMF)
50 / 125 μm
VCSEL SWDM Laser
40G / 100 Gbps up to 440 m (Uses short wavelength multiplexing)