Alternatively, you can purchase a male DB25 connector and solder wires to each of the pins. To assemble a similar cable yourself, you need are a male DB25 connector, some 18-gauge solid wire, some solder, a soldering iron, and a vise or third-hand tool to hold the connector while you solder. You may also want to get some magnifying goggles. I have RS232 wire and want to take form it a ICSP end for my serial AVR programmer, I find it difficult to assign colors to pins,so is ther any standards. The color I found after cutting the end of cable are:white-yellow-red-orange-green-black-purple -brown-blue.
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If you want to get a safe, reliable, sealed and waterproof power and signal connection between your actuators, sensors and industrial devices, robots, automation equipment, you'd better choose IP67 circular waterproof m12 connectors and cable assemblies.
How to choose suitable m12 connectors and cable assemblies for your applications?
How to identify m12 circular connector coding?
How to connect different types of color of core wire to correct pins / positions of m12 male or female connectors?
How to choose a suitable m12 connector and cable assembly to be installed into your devices?
In order to help wide readers solve the upper questions and design and assemble power and signal connection systems for concrete industry applications, I'll introduce them by following different subjects:
I. M12 Connector Coding
![Db25 Wire Color Code Db25 Wire Color Code](https://www.doityourself.com/forum/attachments/heat-pumps-electric-home-heating/42605d1417475681-make-my-wife-happy-thermostat-wiring-question-therm-old.jpg)
There are following male and female A-Coded, B-coded, C-coded, D-coded, X-coded, S-coded, T-coded, L-coded, P-coded m12 connectors.
Db25 Connector Specs
You may identify these coding types of m12 series by below contact layout diagrams:
1. M12 A-coding Connector 3pins 4pins 5pins 8pins 12pins 17pins male pin layout diagram (front view)
Application: m12 A-coding male connector is used for actuator-sensor plug connections for DeviceNet, IO link and Profibus.
2. M12 A-coding Connector 3contacts 4contacts 5contacts 8contacts 12contacts 17contacts female contacts layout diagram (front view)
Application: m12 A-coding female connector is used for actuator-sensor plug connections for DeviceNet, IO link and Profibus.
3. M12 B-coding connector 5 pins male pin and female contact layout diagram:
Applications: Fieldbus connections for Profibus and Interbus
4. m12 C-coding connector 3pin 4pin 5pin 6pin connector pin and contact layout diagram
5. M12 D-coding Connector 4 pole male pin and 4 pos female contact layout diagram:
Applications: Industrial Ethernet, Profinet, Ethernet/IP and EtherCat
6. M12 X-coding 8 pole male pin and 8 positions female contacts layout faceview:
![Db25 wire color codes Db25 wire color codes](https://www.todayifoundout.com/wp-content/uploads/2015/03/electric-wires.jpg)
Applications: Cat6A, high-speed 10Gbit rugged industrial Ethernet.
7. M12 S-coding connector 2+PE, 3+PE male and female pin layout faceview
Applications: Motor, Frequency-convertors, motor operated switches, PSUs for Power, 620V, 12A
8. M12 T-coding connector 4 pole male and female contact arrangement
Applications: Fieldbus comp, passive distribution boxes, motors, PSUs for Power, 63V, 12A
9. M12 L-coding Connector male and female 4pin + PE contact layout diagram
Application: L-coded M12 Power Connector with max 16A current comes true the change from big Power vs small Size alternative to both big Power and small Size. It can be used in the PROFINET application on the condition that needing big power supply and small space. Using L-code M12 connectors means no more difficult choices when designing smaller, more powerful PROFINET system components.
10. M12 P-coding Connector 5 pin male and female contact arranglement.
II. M12 Connector Pinout
1. m12 sensor connector pinout
M12 a-code 3 pin 4 pin 5 pin male and female sensor connector pinout
M12 a-coded 8 pin 12 pole male and female sensor connector pinout
2. M12 male connector pinout
M12 A-coding B-coding D-coding 3 4 5 8 12 pin male connector pinout
3. M12 female connector pinout
M12 A-coded B-coded D-coded 3 4 5 8 12 pole pos female connector pinout
4. m12 4 pin connector pinout
5. m12 5 pin connector pinout
6. m12 8 pin connector pinout
7. m12 12 pin connector pinout
8. m12 17 pin connector pinout
9. m12 Ethernet connector pinout
10. ProfiBus m12 connector pinout
ProfiBUs M12 2Pin 3Pin 4Pin B-Coding Connector Pinout
M12 4 Pin 5 Pin B-Coding ProfiBus Connector Pinout
11. ProfiNet m12 connector pinout
12. DeviceNet m12 connector pinout
13. m12 power connector pinout
M12 S-Coding K-Coding, T-coding L-Coding Power Connector Pinout
III. M12 Connector Wiring Color Code
1. M12 Connector Color Code
2. M12 Cable Color Code
3. M12 Wire Color Code
4. M12 Connector 4 Pin Color Code
5. M12 Connector 5 Pin Color Code
6. M12 8 Pin Connector Color Code & 12 Pin Connector Color Code
7. M12 17 Pin Connector Wire Color Code
8. M12 CANopen / Devicenet Connector Wire Color Code
9. M12 Ethernet Connector Cable Color Code
10. M12 INTERBUS Connector Wire Color Code
11. M12 Ethernet Connector Wire Colour Code
12. M12 Profinet EhterCAT Connector Wire Color Code
13. M12 A-Coded 8-Pole Cat5E Ethernet Connector Wire Color Code
14. M12 X-Coded 8-Pole Cat6E Ethernet and Varan Connector Wire Color Code
15. M12 A-Coded 4-Pole SFC-Interface and CC-Link Connector Wire Color Code
16. M12 S-Coded 2+PE and 3+PE Pole Connector Wire Color Code
17. M12 T-coded 4-Pin Power Connector Wire Color Code
18. M12 L-coded 4+PE Contacts Power Connector Wire Color Code
![Color Color](http://www.fleconn-china.com/fleconn/upload/image/20190721/1563683005169545.png)
IV. M12 Connector Categories
1.M12 Field Wireable Connector
2.M12 Panel Mount Connector
3.M12 PCB Connector
4.M12 X-coded Connector
5.M12 D-Coded Connector
6.M12 Molding type Connector and cable assemblies
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The 25-pair color code, originally known as even-count color code,[1] is a color code used to identify individual conductors in twisted-pairwiring for telecommunications.
Color coding[edit]
With the development of new generations of telecommunication cables with polyethylene-insulated conductors (PIC) by Bell Laboratories for the Bell System in the 1950s, new methods were developed to mark each individual conductor in cables.[2] Each wire was identified by the combination of two colors, one of which is the major color, and the second the minor color. Major and minor colors are chosen from two different groups, resulting in 25 color combinations. The color combinations are applied to the insulation that covers each conductor. Typically, one color was a prominent background color of the insulation, and the other was a tracer, consisting of stripes, rings, or dots, applied over the background. The background color always matches the tracer color of its paired conductor, and vice versa.
The major, or primary group of colors consists of the sequence of white, red, black, yellow, and violet. The minor, or secondary color was chosen from the sequence blue, orange, green, brown, and slate.[3][4]
![Wire Wire](https://micro-manager.org/w/images/9/91/DB-25Pin_Diagram.jpg)
Pair no. | Major color | Minor color |
---|---|---|
1 | White | Blue |
2 | Orange | |
3 | Green | |
4 | Brown | |
5 | Slate | |
6 | Red | Blue |
7 | Orange | |
8 | Green | |
9 | Brown | |
10 | Slate | |
11 | Black | Blue |
12 | Orange | |
13 | Green | |
14 | Brown | |
15 | Slate | |
16 | Yellow | Blue |
17 | Orange | |
18 | Green | |
19 | Brown | |
20 | Slate | |
21 | Violet | Blue |
22 | Orange | |
23 | Green | |
24 | Brown | |
25 | Slate |
The wire pairs are referred to either directly by their color combination, or by the pair number. For example, pair 9 is also called the red-brown pair. In technical tabulations, the colors are often suitably abbreviated.
Violet is the standard name in the telecommunications and electronics industry, but it is sometimes referred to as purple. Similarly, slate is a particular shade of gray. The names of most of the colors were taken from the conventional colors of the rainbow or optical spectrum, and in the electronic color code, which uses the same ten colors, albeit in a different order.[citation needed]
When used for POTS, the first wire is known as the tip or A-leg (U.K.) conductor and is usually connected to the positive side of a direct current (DC) circuit, while the second wire is known as the ring lead or B-leg (U.K.), and is connected to the negative side of the circuit. Neither of these two sides of the line has a connection to the local ground. This creates a balanced audio circuit with common-mode rejection, also known as a differential pair. The tip and ring convention is based on the 1⁄4″ (6.5 mm) TRS phone connectors, which were employed in telephone switchboards in the 19th and 20th centuries, where the tip contact of the connector is separated from the ring contact by a spacer of insulation. The connection furthest from the cable is known as the tip, the middle connection is the ring, and the (largest) connection closest to the wire is the sleeve.
Older Bell System wiring inside customer premises used 4-conductor untwisted wire cable. The 4 conductors were solid red, green, yellow & black wires. They match to the current 25-color code as follows:
green ('Line 1' tip) | white/blue |
red ('Line 1' ring) | blue/white |
black ('Line 2' tip) | white/orange |
yellow ('Line 2' ring) | orange/white |
Db25 Pinout Diagram
25-pair telco cable pinout[edit]
A common application of the 25-pair color code is the cabling for the Registered Jack interface RJ21, which uses a female 50-pin miniature ribbon connector, as shown in the following table. The geometry of the pins of the receptacle (right hand image) corresponds to the pin numbers of the table. The left column of pins are the ring (R) conductors, while all tip (T) conductors are on the right.
Color (minor/major) | (R) | (T) | Color (major/minor) | The corresponding pin order in the female RJ21 connector |
---|---|---|---|---|
Pin No. | ||||
blue/white | 1 | 26 | white/blue | |
orange/white | 2 | 27 | white/orange | |
green/white | 3 | 28 | white/green | |
brown/white | 4 | 29 | white/brown | |
slate/white | 5 | 30 | white/slate | |
blue/red | 6 | 31 | red/blue | |
orange/red | 7 | 32 | red/orange | |
green/red | 8 | 33 | red/green | |
brown/red | 9 | 34 | red/brown | |
slate/red | 10 | 35 | red/slate | |
blue/black | 11 | 36 | black/blue | |
orange/black | 12 | 37 | black/orange | |
green/black | 13 | 38 | black/green | |
brown/black | 14 | 39 | black/brown | |
slate/black | 15 | 40 | black/slate | |
blue/yellow | 16 | 41 | yellow/blue | |
orange/yellow | 17 | 42 | yellow/orange | |
green/yellow | 18 | 43 | yellow/green | |
brown/yellow | 19 | 44 | yellow/brown | |
slate/yellow | 20 | 45 | yellow/slate | |
blue/violet | 21 | 46 | violet/blue | |
orange/violet | 22 | 47 | violet/orange | |
green/violet | 23 | 48 | violet/green | |
brown/violet | 24 | 49 | violet/brown | |
slate/violet | 25 | 50 | violet/slate |
Larger cables[edit]
For cables with more than 25 pairs, each group of 25 is called a binder group. The binder groups are marked with mylar ribbons using the same color coding system, starting with a white/blue ribbon, then a white/orange ribbon, and so on. The 24th binder group has a violet/brown ribbon, completing a super binder of 600 pairs.[3][4]
In cables of more than 600 pairs, each of the 600-pair binder group bundles is wrapped with a mylar binder ribbon, or string, matching the 'tip' colors of the color code, starting with white. The pattern then starts over with the first 25-pair group as white/blue, and continues indefinitely, in multiples of 600 pairs or parts thereof. For example, a 900-pair cable has the first 600 pairs in 24 groups of 25 pairs in a white binder, and the remaining 300 pairs in 12 groups of 25 pairs wrapped in a red binder.[3][4]
Some cables are 'mirrored' or 'clocked' with a pattern that is known throughout the telephone industry. Starting with the first binder group in the center, the technician counts the cable's groups in a spiral direction depending on the location of the central office or switch. If looking at the cable's core and the switch is in that direction, the groups are counted counter-clockwise. If the cable is the field side, the count is clockwise. There are indicators on the mylar ribbons to know where to begin for each layer and a diagram for the different cable sizes should be readily available for reference.[3][4]
Other color schemes are sometimes used for outdoor cables, particularly outside the U.S., but this color code is common for aerial and underground cables up to several thousand pairs in North America. In the UK, the British Post Office (later BT) used this color code for what is now known loosely as CW1308 specification cables, referring to the Post Office's 'Cable and Wire' specification No. 1308.
Extra pairs and colors[edit]
When working on aerial cable splicing and installation, it is common to use a telephone lineman's set or 'Butt Set' to communicate over long distances. To facilitate this, extra pairs of wires are embedded in cables. One extra pair (Red-White) may be embedded into cables that are 6 to 75 pairs; two pairs (Red-White and Black-White) may be encapsulated in cables of 100 to 300 pairs; and three pairs (Red-White, Black-White, and Yellow-White) may be included in cables of 400 to 900 pairs.[4] These extra pairs are often referred to as 'talk pairs', and are never used to deliver dial tone.
![Instabeauty app download for pc Instabeauty app download for pc](https://dl1.cbsistatic.com/resize/52a6a1b17300c80b52422074b286cf8b9da984ab/catalog/2017/06/29/f8602c10-fa00-4196-9886-5c8a6e672b3f/imgingest-2680730510406428828.jpg?width=416)
There are following male and female A-Coded, B-coded, C-coded, D-coded, X-coded, S-coded, T-coded, L-coded, P-coded m12 connectors.
Db25 Connector Specs
You may identify these coding types of m12 series by below contact layout diagrams:
1. M12 A-coding Connector 3pins 4pins 5pins 8pins 12pins 17pins male pin layout diagram (front view)
Application: m12 A-coding male connector is used for actuator-sensor plug connections for DeviceNet, IO link and Profibus.
2. M12 A-coding Connector 3contacts 4contacts 5contacts 8contacts 12contacts 17contacts female contacts layout diagram (front view)
Application: m12 A-coding female connector is used for actuator-sensor plug connections for DeviceNet, IO link and Profibus.
3. M12 B-coding connector 5 pins male pin and female contact layout diagram:
Applications: Fieldbus connections for Profibus and Interbus
4. m12 C-coding connector 3pin 4pin 5pin 6pin connector pin and contact layout diagram
5. M12 D-coding Connector 4 pole male pin and 4 pos female contact layout diagram:
Applications: Industrial Ethernet, Profinet, Ethernet/IP and EtherCat
6. M12 X-coding 8 pole male pin and 8 positions female contacts layout faceview:
Applications: Cat6A, high-speed 10Gbit rugged industrial Ethernet.
7. M12 S-coding connector 2+PE, 3+PE male and female pin layout faceview
Applications: Motor, Frequency-convertors, motor operated switches, PSUs for Power, 620V, 12A
8. M12 T-coding connector 4 pole male and female contact arrangement
Applications: Fieldbus comp, passive distribution boxes, motors, PSUs for Power, 63V, 12A
9. M12 L-coding Connector male and female 4pin + PE contact layout diagram
Application: L-coded M12 Power Connector with max 16A current comes true the change from big Power vs small Size alternative to both big Power and small Size. It can be used in the PROFINET application on the condition that needing big power supply and small space. Using L-code M12 connectors means no more difficult choices when designing smaller, more powerful PROFINET system components.
10. M12 P-coding Connector 5 pin male and female contact arranglement.
II. M12 Connector Pinout
1. m12 sensor connector pinout
M12 a-code 3 pin 4 pin 5 pin male and female sensor connector pinout
M12 a-coded 8 pin 12 pole male and female sensor connector pinout
2. M12 male connector pinout
M12 A-coding B-coding D-coding 3 4 5 8 12 pin male connector pinout
3. M12 female connector pinout
M12 A-coded B-coded D-coded 3 4 5 8 12 pole pos female connector pinout
4. m12 4 pin connector pinout
5. m12 5 pin connector pinout
6. m12 8 pin connector pinout
7. m12 12 pin connector pinout
8. m12 17 pin connector pinout
9. m12 Ethernet connector pinout
10. ProfiBus m12 connector pinout
ProfiBUs M12 2Pin 3Pin 4Pin B-Coding Connector Pinout
M12 4 Pin 5 Pin B-Coding ProfiBus Connector Pinout
11. ProfiNet m12 connector pinout
12. DeviceNet m12 connector pinout
13. m12 power connector pinout
M12 S-Coding K-Coding, T-coding L-Coding Power Connector Pinout
III. M12 Connector Wiring Color Code
1. M12 Connector Color Code
2. M12 Cable Color Code
3. M12 Wire Color Code
4. M12 Connector 4 Pin Color Code
5. M12 Connector 5 Pin Color Code
6. M12 8 Pin Connector Color Code & 12 Pin Connector Color Code
7. M12 17 Pin Connector Wire Color Code
8. M12 CANopen / Devicenet Connector Wire Color Code
9. M12 Ethernet Connector Cable Color Code
10. M12 INTERBUS Connector Wire Color Code
11. M12 Ethernet Connector Wire Colour Code
12. M12 Profinet EhterCAT Connector Wire Color Code
13. M12 A-Coded 8-Pole Cat5E Ethernet Connector Wire Color Code
14. M12 X-Coded 8-Pole Cat6E Ethernet and Varan Connector Wire Color Code
15. M12 A-Coded 4-Pole SFC-Interface and CC-Link Connector Wire Color Code
16. M12 S-Coded 2+PE and 3+PE Pole Connector Wire Color Code
17. M12 T-coded 4-Pin Power Connector Wire Color Code
18. M12 L-coded 4+PE Contacts Power Connector Wire Color Code
IV. M12 Connector Categories
1.M12 Field Wireable Connector
2.M12 Panel Mount Connector
3.M12 PCB Connector
4.M12 X-coded Connector
5.M12 D-Coded Connector
6.M12 Molding type Connector and cable assemblies
- company
- About us
- partners
- Download
- Company Introduction
- Site Map
- The connector
- Electrical Connectors
- Wire-to-Wire Connector
- Wire-to-Board Connector
- Board-to-Board Connector
- I/O USB Connectors
- M8 M12 connector
- M8 Field Wireable Connector
- M8 Panel Mount Connectors
- M8 Cable Assembly
- M12 connector
- M12 Connectors, Field Wireable
- M12 Panel Mount Connectors
- M12 X Coding Connector
- Other products
- Custom Cable Assembly
- Wire Harness Manufacturer
- Cable/ Wiring Loom Manufacturer
- Custom USB cables
- Custom Waterproof Cable
- Custom HDMI Cables
- M5 Connector/ M5 cable
- M8 Connector
- M12 Cable Assembly
- Product Design Services
- Custom Connector Developing
- Resources
- Catalog
- Documents
- other
- News publications
- Technology Articles
- Confidentiality Treaty
- On-site search
- Site Map
- Message feedback
- Friendly Link
- M5 M8 M12 M16 M23 Circular Waterproof Connector and Overmoulded Cable Assembly
- fleconn store
The 25-pair color code, originally known as even-count color code,[1] is a color code used to identify individual conductors in twisted-pairwiring for telecommunications.
Color coding[edit]
With the development of new generations of telecommunication cables with polyethylene-insulated conductors (PIC) by Bell Laboratories for the Bell System in the 1950s, new methods were developed to mark each individual conductor in cables.[2] Each wire was identified by the combination of two colors, one of which is the major color, and the second the minor color. Major and minor colors are chosen from two different groups, resulting in 25 color combinations. The color combinations are applied to the insulation that covers each conductor. Typically, one color was a prominent background color of the insulation, and the other was a tracer, consisting of stripes, rings, or dots, applied over the background. The background color always matches the tracer color of its paired conductor, and vice versa.
The major, or primary group of colors consists of the sequence of white, red, black, yellow, and violet. The minor, or secondary color was chosen from the sequence blue, orange, green, brown, and slate.[3][4]
Pair no. | Major color | Minor color |
---|---|---|
1 | White | Blue |
2 | Orange | |
3 | Green | |
4 | Brown | |
5 | Slate | |
6 | Red | Blue |
7 | Orange | |
8 | Green | |
9 | Brown | |
10 | Slate | |
11 | Black | Blue |
12 | Orange | |
13 | Green | |
14 | Brown | |
15 | Slate | |
16 | Yellow | Blue |
17 | Orange | |
18 | Green | |
19 | Brown | |
20 | Slate | |
21 | Violet | Blue |
22 | Orange | |
23 | Green | |
24 | Brown | |
25 | Slate |
The wire pairs are referred to either directly by their color combination, or by the pair number. For example, pair 9 is also called the red-brown pair. In technical tabulations, the colors are often suitably abbreviated.
Violet is the standard name in the telecommunications and electronics industry, but it is sometimes referred to as purple. Similarly, slate is a particular shade of gray. The names of most of the colors were taken from the conventional colors of the rainbow or optical spectrum, and in the electronic color code, which uses the same ten colors, albeit in a different order.[citation needed]
When used for POTS, the first wire is known as the tip or A-leg (U.K.) conductor and is usually connected to the positive side of a direct current (DC) circuit, while the second wire is known as the ring lead or B-leg (U.K.), and is connected to the negative side of the circuit. Neither of these two sides of the line has a connection to the local ground. This creates a balanced audio circuit with common-mode rejection, also known as a differential pair. The tip and ring convention is based on the 1⁄4″ (6.5 mm) TRS phone connectors, which were employed in telephone switchboards in the 19th and 20th centuries, where the tip contact of the connector is separated from the ring contact by a spacer of insulation. The connection furthest from the cable is known as the tip, the middle connection is the ring, and the (largest) connection closest to the wire is the sleeve.
Older Bell System wiring inside customer premises used 4-conductor untwisted wire cable. The 4 conductors were solid red, green, yellow & black wires. They match to the current 25-color code as follows:
green ('Line 1' tip) | white/blue |
red ('Line 1' ring) | blue/white |
black ('Line 2' tip) | white/orange |
yellow ('Line 2' ring) | orange/white |
Db25 Pinout Diagram
25-pair telco cable pinout[edit]
A common application of the 25-pair color code is the cabling for the Registered Jack interface RJ21, which uses a female 50-pin miniature ribbon connector, as shown in the following table. The geometry of the pins of the receptacle (right hand image) corresponds to the pin numbers of the table. The left column of pins are the ring (R) conductors, while all tip (T) conductors are on the right.
Color (minor/major) | (R) | (T) | Color (major/minor) | The corresponding pin order in the female RJ21 connector |
---|---|---|---|---|
Pin No. | ||||
blue/white | 1 | 26 | white/blue | |
orange/white | 2 | 27 | white/orange | |
green/white | 3 | 28 | white/green | |
brown/white | 4 | 29 | white/brown | |
slate/white | 5 | 30 | white/slate | |
blue/red | 6 | 31 | red/blue | |
orange/red | 7 | 32 | red/orange | |
green/red | 8 | 33 | red/green | |
brown/red | 9 | 34 | red/brown | |
slate/red | 10 | 35 | red/slate | |
blue/black | 11 | 36 | black/blue | |
orange/black | 12 | 37 | black/orange | |
green/black | 13 | 38 | black/green | |
brown/black | 14 | 39 | black/brown | |
slate/black | 15 | 40 | black/slate | |
blue/yellow | 16 | 41 | yellow/blue | |
orange/yellow | 17 | 42 | yellow/orange | |
green/yellow | 18 | 43 | yellow/green | |
brown/yellow | 19 | 44 | yellow/brown | |
slate/yellow | 20 | 45 | yellow/slate | |
blue/violet | 21 | 46 | violet/blue | |
orange/violet | 22 | 47 | violet/orange | |
green/violet | 23 | 48 | violet/green | |
brown/violet | 24 | 49 | violet/brown | |
slate/violet | 25 | 50 | violet/slate |
Larger cables[edit]
For cables with more than 25 pairs, each group of 25 is called a binder group. The binder groups are marked with mylar ribbons using the same color coding system, starting with a white/blue ribbon, then a white/orange ribbon, and so on. The 24th binder group has a violet/brown ribbon, completing a super binder of 600 pairs.[3][4]
In cables of more than 600 pairs, each of the 600-pair binder group bundles is wrapped with a mylar binder ribbon, or string, matching the 'tip' colors of the color code, starting with white. The pattern then starts over with the first 25-pair group as white/blue, and continues indefinitely, in multiples of 600 pairs or parts thereof. For example, a 900-pair cable has the first 600 pairs in 24 groups of 25 pairs in a white binder, and the remaining 300 pairs in 12 groups of 25 pairs wrapped in a red binder.[3][4]
Some cables are 'mirrored' or 'clocked' with a pattern that is known throughout the telephone industry. Starting with the first binder group in the center, the technician counts the cable's groups in a spiral direction depending on the location of the central office or switch. If looking at the cable's core and the switch is in that direction, the groups are counted counter-clockwise. If the cable is the field side, the count is clockwise. There are indicators on the mylar ribbons to know where to begin for each layer and a diagram for the different cable sizes should be readily available for reference.[3][4]
Other color schemes are sometimes used for outdoor cables, particularly outside the U.S., but this color code is common for aerial and underground cables up to several thousand pairs in North America. In the UK, the British Post Office (later BT) used this color code for what is now known loosely as CW1308 specification cables, referring to the Post Office's 'Cable and Wire' specification No. 1308.
Extra pairs and colors[edit]
When working on aerial cable splicing and installation, it is common to use a telephone lineman's set or 'Butt Set' to communicate over long distances. To facilitate this, extra pairs of wires are embedded in cables. One extra pair (Red-White) may be embedded into cables that are 6 to 75 pairs; two pairs (Red-White and Black-White) may be encapsulated in cables of 100 to 300 pairs; and three pairs (Red-White, Black-White, and Yellow-White) may be included in cables of 400 to 900 pairs.[4] These extra pairs are often referred to as 'talk pairs', and are never used to deliver dial tone.
Optical fiber cables use a twelve-color code, where the first ten are the same as in the 25-pair color code, and the last two are Rose and Aqua.[5]
Memorizing the colors[edit]
Various mnemonics have been used to remember the color coding of the major color groups and the minor color groups: English speaking notes pdf free download.
Why Run Backwards, You'll Vomit - White-Red-Black-Yellow-Violet[6]
Bell Operators Give Better Service - Blue-Orange-Green-Brown-Slate[7]
See also[edit]
References[edit]
- ^AT&T, Bell System Practices, Section 461-200-101 Issue 7, Connector Cables—Identification (May 1979)
- ^F.W. Horn, Even-Count Cable, Bell Laboratories Record 37(6), 208 (June 1959)
- ^ abcdHighhouse, John (1997). A Guide for Telecommunications Cable Splicing. Cengage Learning. ISBN9780827380660.
- ^ abcdeAmerican Telephone And Telegraph Company (February 1959). Even PIC Cables(PDF). Bell System Practices – Outside Plant Construction and Maintenance, Section G50.607.3 Issue 2.
- ^Color for Fiber Optic Cables
- ^Abruzzino, James: Communications Cabling (2E), page 187. CNC Press, 2000
- ^
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