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There's (A) Untwisted and (B) Unshielded Twisted Pair. (**) When a PIC cable is abandoned, the last letter is sometimes changed on the prints to an X indicating that it is no longer in use, such as BKTX. A cable marked as 51-17 was a 51 pair cable, with 17 gauge conductors. Anixter Inc. 2301 Patriot Boulevard, Glenview, Illinois 60026, USA, CABLE, 24 AWG, 200 PAIR, EXCHANGE CABLE PE FOAM SKIN SHIELD, FILLED CONDUCTOR, CALPETH BURIAL, COATED, 8 MIL CORRUGATED ALUMINUM, SJ CALPETH. Topics Covered in this Guide. Subsequent pairs (up to pair 10) use blue with each of the remaining colours in-turn (blue/orange, blue/green, blue/brown and blue/slate. This consists of red and green wires, which makes a pair, and yellow and black wires, which makes the other pair. STANDARD COLOR CODE FOR TELECOM CABLE Telecommunications cable comes in many sizes; 1 pair, 3 conductor, 2, 4, 5, 6, 8, 12, 25, 50, 75, 100, 150, 200, 300, 400, 600, 900, 1200, 1500, 1800, 2100, 2400, 2700, 3000, 3600 and 4200 pairs. as normal. It was the air in and around the paper that provided the insulation. pair group from another since they both will have the same sequence of pair In technical tabulations, the colors are often suitably abbreviated. For sheathed station cables (pairs are usually not twisted) containing four to eight APAC Region Sales Office 80, 41st Cross, 8th Block Jayanagar, Bangalore - 560070 India +91 80 41315863 Info.India@multicable.com 2-paired installation cables are stranded to a star quad. Visit my Link Tree for free electrical advice, supplies, stickers, merchandise, and social media links. method of telling one pair from another. A second telephone line with a different phone number would terminate on solid Black and solid Green. The 25-pair color code, originally known as even-count color code,[1] is a color code used to identify individual conductors in twisted-pair wiring for telecommunications. Many questions related to installing a second cable color codes wire color codes . COLOR CODE CHART NO. While making a straight-through cable, make sure on both the side you have to apply the same standards either EIA/TIA 568A or EIA/TIA 568B. The insulating coverings of single conductors of a quad are to be marked with black rings: The insulating cores of five star quads of a sub-unit must have the following colours: The first sub- or main-unit in each layer is to be marked by an open helix of plastic tape of red (marker). Both lead and paper/pulp have an inherent weakness in outdoor applications. The colour-code is based on the five-colour sequence of Blue, Orange, Green, Brown, Slate which are used in that order with a White mate for the first five pairs. 3. all assemblies to be 100 % hi-pot tested at 630v. 4.1 (11) $1991. the telecom hardware we use and sell. PIC cables have a steel/aluminum sheath around the conductors, and a polyethylene outer jacket. The color combinations are applied to the insulation that covers each conductor. This system has been used quite often, mainly by telcos that were part of the Bell System, but it is not a guarantee of direction. Pair one, for example, has one white conductor To help determine the pneumatic resistance of the commom types of telephone cables, System Studies has provided this cable identification chart. You can see the Test Socket revealed to allow you to check the BT line before your own wiring. This applies to Underground fed properties with older BT cable, and BT overhead 'Dropwire'. The solid orange wire is the Ring and is connected to the red jack terminal. However, several times when I have been in clients homes, I got asked to install one or more telephone jacks. var PAGENAME = escape(''); For cables with more than 25 pairs, each group of 25 is called a binder group. The 6-position modular jack is commonly In addition, Anixter.com offers Less-Than-A-Truckload LTL option for products that cannot be shipped via parcel shipping. The blue pair is connected as the primary telephone line. var pc = 1382; Binder groups within the cable come in sizes of 25, 26, 50, 51, 100 and 101 pairs, depending upon the wire Study with Quizlet and memorize flashcards containing terms like When cutting 200 pair telephone cable, a ? I recently purchased a Leviton Decora-style telephone jack, and the above wiring diagram was included in the package. Limited Access Locations - A limited access location is a site where pickup or delivery is restricted or limited. E) Colour Code & Cable Make Up According to DIN VDE 0815 & 0816. Typically, one color is a prominent background color of the insulation, and the other is a tracer, consisting of stripes, rings, or dots, applied over the background. //-->, **NOTE: The colour YELLOW-Green should be reserved for earth or safety wires, B) Colour Code & Cable Make Up According to ICEA S-80-576, In accordance with ICEA publication S-80-576-2002, the colour code is composed of ten (10) distinctive colours to identify 25 pairs. App name : GloryFit Screen Material : IPS Band Detachable : Yes APP Download Available : No Battery Detachable : No Resolution : 360*360 IPS Display Size : 1.32 Inch Movement Type : Electronic Style : SPORT Application Age Group : Adult Screen Shape : Round Case Material : Alloy Band Material : Silica gel Waterproof Grade : Professional Waterproof SIM Card Available : No Mechanism : Yes . Color Code Chart No.3 for Paired Cables (Belden Standard) Color Code Chart No.4 for Paired Cables Color Code Chart No. electronic master. #2 Pair # Cond. Wiring for premises sometimes employs some method of marking to show which From 1876 to 1888, there were a number of different types of cables used, and no real format to them. If you see one in your house, or more likely in your basement, just unplug it. Mr. Electrician is a Registered Trademark. All rights reserved. The colors are referred to as "Tip" and "Ring", terms which This supports up to 625 pairs (25 binders x 25 pairs per bundle = 625 pairs), though Violet/Slate is not used (therefore, 600 pairs). DIRECT BURIAL TELEPHONE CABLE Filled Core REA PE-89AL . . The cable is filled with water resistant jell and UV resistant. Then they could simply wrap some colored electric tape around the cable within the cabinet, or possibly used some colored plastic ties, and more easily know for sure the direction of the cable. 2) Enter cable count. Using RJ terms often leads Price Per Foot. This method involves using 10 basic PIC cables were also gel-filled. The following pictures show the standard BT Telephone Wiring Colour Code used with the BT NTE5 Master Socket. Colour Code for the following Outdoor Telephone Cable Types: A-02Y(L)2YBd, A-02YSF(L)2Y..Bd and A-02YF(L)2YBd. Unit Binder Color code is used to separate multiple Binder bundles. For cables of 100-pair or less, the White binder is optional. You should be able to get your 200Mbps with cat5e if all 4 pairs are terminated. The yellow and black wires were usually used to power the lighted dial. 9 ft. Deluxe HDMI Cable (2-Pack) Add to Cart. Only 3 connectionsshould beused connections 2, 3 and 5. A second telephone line with a different phone number would terminate on solid Black andsolid Green. This creates a balanced audio circuit with common-mode rejection, also known as a differential pair. Theseshould not beused as conductors. For bandwidth, doesn't matter what order they're terminated in, but you should follow a standard and be consistent throughout your install. var TRANSACTION_ID = 0; I think it was the yellow and black wires that were connected to the terminals on the transformer. Edit : I just took a closer look at that site for the external colour codes and they have the binder colours wrong for pairs 51-100.Its White/colour not Blue/colour. JE-Y(St)Y . The most common is the RJ-11, which uses only two of the wires in a four (or more) conductor small cable. How do you tell one 25 Group 1, Super-units Binder Identification Colours. Below are the 2-letter codes for the 4 different types of armored cables. 2 HDPE, SCH 40, Black, Empty, UL Listed. This website uses cookies to improve your experience while you navigate through the website. Kolors telephone cables 90m; Finolex 0.5mm 10 pair jelly filled telephone cables, 90m It typical use is for Computers Network; however it is used for Telephone and other Media. Sometimes the air cables are accessible closer to the manhole lid. The wire pairs are referred to either directly by their color combination, or by the pair number. Counting direction in all units is from inside to outside. The DSL or telephone lines in our houses have one extra pair in them. Such cables require different handling than a cable with fully-marked wires. This applies to Underground fed properties with older BT cable, and BT overhead Dropwire. The fourth modular The low voltage wiring to the princess telephone power transformer was ordinary cat 3, two-pair telephone wire. These lead cables were identified only by their pair count and gauge. Standard Wire & Cable Co. design, engineer, and manufacture commercial, military, and industrial electronic and electrical wire and cable. You can see it further down on this page. Over the years the cables were often produced with smaller and smaller tip and ring wires, and this shows in the increase in number for the wire gauge. Also, many old lead cables have been relabeled on some phone prints using the 4-letter code, but always beginning with the letters XX. RJ-11 connector wiring comes in two standard types. All other sub- or main-units must be whipped with an, The quads of a sub-unit are to be counted according to the sequence of basic colours. Paper cables were still used inside of the Central Office. Many technicians also refer to them as Plastic Insulated Cable. As such, we strive to adhere to the Web Content Accessibility Guidelines 2.1 Levels A and AA, a set of guidelines developed by the World Wide Web Consortium and used to ensure that digital content is accessible to everyone. The conductors colors are red, green, black, and yellow. The color compass can be easily remembered using the phrase Only Good Boys Succeed. This is referred to in the 4-letter code as though the sheath and jacket were one and the same, so they are labeled as having a sheath of aluminum/steel/polyethylene, or with an acronym for the three such as ASP. Cond. of units: 1 x 2 p, shi. Until a few years ago, it was customary to use "quad" This C code was applied to fiber lines when they were first being installed in the early 1980s, and was partially meant to quickly identify fiber lines from the old copper lines. . The cable pairs are color coded as shown: Each pair consists of a colored wire and a white wire with a matching color stripe. and yellow is frequently employed. The minor, or secondary color was chosen from the sequence blue, orange, green, brown, and slate. 4C Conduit (may be an empty conduit for future use), 5C Cable in Conduit (cable was pulled through the conduit as soon as it was placed in the ground), 6C Submarine Cable (placed under water such as a lake or river). The other color is white and indicates the cable that connects with a load coil. 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. We are offering this range at reasonable rate. Mirror image telephone cable core constructions are available in 1200 pair or more cable designs, all of which use 100 pair super units. be made. Any damage or excessive wear on the sheath can easily allow water inside the cable. Newer homes can have anything from Cat-3, 3-pair on up to Cat-5e, with 4-pairs, with the insulation colors being a combination of solid and solid with white for each wiring pair. (www.scottmac.net) CAT5 was design as a Multi purpose Cable, to be used in transfer variety of Information Signal. The original purpose of that transformer was to provide power to a Princess Telephone with a dial that lit up. This required a unique tool for assembly. Conductor color code according to T568B and T568A; . Black White Yellow Blue Color Code 50 100 200 300 Pair Telephone Cable , Find Complete Details about Black White Yellow Blue Color Code 50 100 200 300 Pair Telephone Cable,300 Pair Telephone Cable,200 Pair Telephone Cable,100 Pair Telephone Cable from Communication Cables Supplier or Manufacturer-Huizhou Yuekai Industrial Co., Ltd. One telephone wire line needs only two wires. The designation RJ means Registered Jack, and should be used With the 4-letter code, the pair count will always follow the code, such as: ANMW 2, but if the number is only a single digit then it is an indication of a number that should be followed by 2 zeros. Those pairs are then combined in to bundles of 25 pairs per bundle, so a 200 pair cable has 8 binder groups. pulp-insulated cable in service, especially with high pair counts of 1,500 to 2,700 pairs. The cable with the green plastic tie runs in a general easterly direction. Do not underestimate the danger of the steel support wires. Wiring diagrams of mine for bathroom fans, ceiling fans, two-way switches, three-way switches, four-way switches, and motors can be found by clicking here. To facilitate this, extra pairs of wires are embedded in cables using "major" colors for both wires (instead of the major/minor color combinations used for the rest). . Pair No. banded color codes. Telco wire colors for 25-pair cables Colors used in telco wires. Similarly, slate is a particular shade of gray. Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet. BEWARE when cutting or stripping this cable the wiresare EXTREMELY sharp and will leave a nasty prick or cut. The blue pair is; first, the orange pair is second, the green pair is third, and the brown pair is fourth. . group becomes the basic building block for bigger cables. They have colored insulation on the tip and ring wires, but it is not an individual color coding. Melbourne Office 28 . As long as the air pressure exceeds the psi of surrounding water, which is usually no more than 5 psi even in 10 feet of water, the air will keep the water out. unique color). Make-up & Unit Identification Colours 20 Pair Unit. For example, for Pair 1, there 625 codes won't be able to tell this many wires apart! Most lead cables had splice cases that were hand-soldered. has four or six conductors, it always uses the first four or six colors. conductors, the following table is used. 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. incorrectly referred to as RJ45. Although both lead and paper cables had paper insulation, the paper itself was never the true insulation. #2 configurations. No need to terminate the brown wire. These are the standard color codings for telephone cables containing up to 26 pairs. [3] The minor, or secondary color is chosen from the sequence blue, orange, green, brown, and slate (mnemonics Bell Operators Give Better Service[4]).[5][6][7]. If the load coil is not visible aboveground, then it is buried beneath the pedestal. They have some similarities to PIC cables except that their tip and ring wires are not twisted together, but separated, all tip wires are bundled together, and all ring wires are bundled together. When removing the old telephone jacks, take note of the telephone wire color code and which wires are being used on the old jacks. return "id="+id+"&pc="+pc+"&p="+PAGENAME+"&gr="+CONTENTGROUP+"&tr="+TRANSACTION+"&trid="+TRANSACTION_ID+"&ord="+ORDER; These are the standard color codings for telephone cables containing up to 26 pairs. The major, or primary group of colors consists of the sequence of white, red, black, yellow, and violet (mnemonics Why Run Backwards, You'll Vomit). Line 2 uses the yellow-black pair. Paper cables have been labeled with the 4-letter code on phone prints, but not on the cables themselves. Color codes are used in fiber optics to identify fibers, cables and connectors. the plug. It is desirable for manufacturing purposes to combine four 25-pair groups into "super units" when cables have 900-pair or more. 2022 John Grabowski All Rights Reserved Mr. Electrician is a Registered Trademark. That load coil may be aboveground or belowground. PIC cables are produced in pair counts of 25, so their sizes are 25, 50, 75, 100, 200, etc. This system allows up to 600 pair cables (violet/slate binders are never used; 25 pairs x 24 units = 600 pair) to be made. of Sheathed Catenery Sheathed Cable Approx Part No. Bd, JE-LiYCY . The last two letters, BT, indicate that this is an armored cable. . The blades are designed to bite through the insulation and make a connection. 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. They are produced in pair counts of 26, 54, 106, and 210. The other is the RJ-14, which uses four wires and its used to handle two telephone lines or 2-line phones. Three phone cable. How do I connect the new telephone jacks? However, if you only have one phone line for your house, you should use the same color pair for each new phone jack you install. Answer: I have put together a residential telephone wiring color code chart to help you understand how to connect the existing four-pair telephone wiring in your walls to the new telephone jacks. The white wire with an orange stripe is terminated on the green Tip screw. would be best cutter, The Ideal Telecutter may be used for cutting up to (quantity) pair telephone cable, the primary designed use of the ? Typically a large stripes. BT external overhead cable contains 3 red, or 3 yellow wires. Those pairs are then combined in to bundles of 25 pairs per bundle, so a 200 pair cable has 8 binder groups. The white wire with a blue stripe is terminated on the green Tip screw. Our telephone cable guide explores its uses, cable and connector types, specifications, features and colour codes. NOTE: Some text links below go to applicable products on eBay or Amazon. . Each pair can be used as a phone line, so in this example you can use this cable for up to four phone lines. TELEPHONE COLOR CODE FOR JACKS IN YOUR HOME, Electrical Terms, Definitions, & Equations. This category only includes cookies that ensures basic functionalities and security features of the website. Any slack cablemust be tucked inside the box before securing the front plate with screws. Many lead cables are now pressurized (with an accompanying air hose), and lead cables are usually found only in duct runs, though there are exceptions. Dont strip the insulation from the wires when terminating the telephone cable. These paper/pulp cables were manufactured from about the late 1940s up to 1958. It was the above-mentioned long-forgotten transformer. The Bell Circuit, pin 3, should therefore not be connected if you would like faster broadband. 2. all assemblies to be 100 % electronically tested for shorts and opens. It is desirable for manufacturing purposes to combine four 25 pair groups into super units when cables have 900 pairs or more. . Nom Pairs Wire dia. Instead, a color code using green, red, black, Ground wiring should be green, or green with a yellow stripe. standards typically list the ring colors first. While not necessary to use in the app. That paper/air insulation reacts like a paper towel and soaks up any moisture touching the cable. The table below gives the colour-coding for external communications cables up to 100 pairs. fmtp-06-d-08.77-01 pdf fmtp-06-d-08.77-01 revision c notes: 1. represents a critical dimension. . goes to the jack. Bd and J-2Y(St)Y . 10/100 base T Ethernet uses the green and orange pairs, specifically so that you can still use the blue and brown pairs for telephones. Tip refers to the one side of a two-wire telephone wire circuit connected to the batterys positive side (+) at the telephone companys central office. the Bell and GTE systems, it gets more complicated and I'm not going to detail the sequence is still the same. Note that this is the latest type available with a Bell Circuit Filter (the cylindrical protrusion next to the terminals). LEAD Produced from 1888 to the late 1940s. In 1887 a conference was held between a number of the different companies to establish standards. In 1958 came the PIC cable, Polyethylene Insulated Cable. The air hose will come from the compressor into the manhole, where it will make its first connection onto the cable. 5. parts to be layer packaged. Bd, JE-H(St) . The quads of sub units are counted according to the sequence of basic colours. . Note 1: refers to sub-units of 10 Pairs. Wire Color Code Charts TIA-598-A FiberOptic Color Code Fiber# Insulation color Fiber# Insulation color 1 Blue 7 Red 2 Orange 8 Black 3 Green 9 Yellow 4 Brown 10 Violet 5 Slate 11 Rose 6 White 12 Aqua Note: More than 12 Fibers the color code repeats and have striped subgroups CCC Color Code Pair # Cond. These cookies do not store any personal information. * Based on the Full Count binder color coding used in RDUP copper cable designs having 1,200-pair or more. The other cable has both a blue and slate colored tie. This system allows up to 600 pair For Conductors color code see below. Note 1: In each triple there shall be a c-wire, coloured TURQUOISE. Or fastest delivery Feb 28 - Mar 3. Generally, the phone company connects the telephone lines at their termination block in a specific order. Also find Jelly Filled Telephone Cables price list | ID: 4714313091 They first three are all twisted pair copper cables, but there are several differences between them which can be summarized here. properties. frame wire and station wire. Note that in a cable smaller than 6 pairs, it may only be necessary to apply solid- color wire, that matched the wires inside a jack. 2 and 5 give you dial tone and allow you to make and receive calls. stripe) and the blue conductor would have white bandmarks (or a white stripe). Neither term is really accurate since the air being pushed into the hose is more nitrogen than oxygen. 1) Select the round Cable Type button. bound with colored binders. usb port. The keyed In addition to the 4-Letter code, there may sometimes be another 2-Letter code shown after the pair count, such as: BKTA 200 BT. A few cables are even produced with pair counts of 75, and 175. [5][6], Some cables are "mirrored" or "clocked" with a pattern that is known throughout the telephone industry. In other words, it is the "in cable". I recall having one of my regular clients get me over to check their phone wiring after a telephone repair person told them that they had voltage on their phone wires. . T1 T-Screen T-Screen cables are used in the T-1 through T-3 systems. All cores in each unit are marked with coloured rings and ring-groups. I want to replace all the old telephone jacks, but I am confused by the tip and ring color code. The first group of colors is: white, red, black, yellow, violet. Please note you must use the correct inserter tool to push the wires in to the phone socket IDC connectors. The most common type is the 4-strand (2 twisted pair). to confusion since the RJ designations refer to very specific USOC wiring P08F3 200/22 1.4 1330 P09F3 300/22 1.7 1950 P10F3 400/22 2.0 2570 P11F3 600/22 2.4 3900 However, for outside plant cables, US [6] These extra pairs are often referred to as "talk pairs", and are never used for subscriber service. Order) CN Huizhou Yuekai Industrial Co., Ltd. 8YRS 5.0 ( 5) | "fast service" Contact Supplier 1 / 6 Telephone cable 25/50/75/100 pair cable color code CE ISO APPROVAL $10.00-$150.00 / box 10 boxes (Min. They may show only the 4-letter code, sometimes with just an additional B for the buried cables, while more simplified prints may only show the C codes, probably with F/O for the fiber lines. Some can be used on 3-pair and 4-pair jacks. Related Products. Gophers can easily chew through a PIC cable. For standard phone service, you can plug a standard two-pair phone plug into this jack. phone line in a home come down to confusion over mating one color code scheme BradyPrinter M611 Mobile Label Printer and the M211 Label Printer, allow you to design, preview and print labels using a phone's familiar keyboard and an app. The biggest cable was a 52 pair. The cores are twisted together with a uniform lay on a special purpose imported machine, according to the color code to form pairs. 1st set of 2nd set of, Numbers*- Numbers-, Years Produced Pair Count Gauge Sheath Insulation, 1888-1891 52 18 lead/tin oiled cotton, 1891-1892 52 19 lead/tin waxed paper, 1892-1895 100 19 lead/tin waxed paper, 1895-1896 152 19 lead/tin waxed paper, 1896-1896 180 19 lead/tin waxed paper, 1896-1901 208 19 lead/tin waxed paper, 1901-1912 303 19 lead/tin waxed paper, 1901-1902 404 22 lead/tin waxed paper, 1902-1912 606 22 lead/tin waxed paper, 1912-1958 26 22 lead/tin/antimony waxed paper, 1912-1958 51 22 lead/tin/antimony waxed paper, 1912-1918 303 19 lead/tin/antimony waxed paper, 1912-1930s 909 22 lead/tin/antimony waxed paper, 1914-1930s 1212 24 lead/tin/antimony waxed paper, c.1915-1958 26 & 51 24 lead/tin/antimony waxed paper, 1918-1930s 455 19 lead/tin/antimony waxed paper, c.1925-1958 100 -1200 24 lead/tin/antimony waxed paper, 1930s 1958 100 900 22 lead/tin/antimony waxed paper, c.1940-1958 26-51-100 26 lead/tin/antimony waxed paper, c.1940-1958 26-70-100 19 lead/tin/antimony waxed paper, 1942 54 19 lead/tin/antimony waxed paper, 1950s 26 51 400 22 alum/poly waxed paper, 1950s 2400 26 alum/stl/poly waxed paper, PIC Cables (and many Paper cables) 1958 to present. Use the two wires in one of those pairs for your telephone connection. By clicking Yes, I Agree, you consent to the use of the cookies according to your choices in the Cookie Settings. The largest cable produced was the 2400 pair. 277/480. D) Colour Code & Cable Make Up According to CW 1171, CW 1224, CW 1236, Binder Colour Identification (Double & Quadruple Units), Binder Colour Identification (Centre & Layers), Nunber&Pair Sizes of Units in Centre and successive Layers. 3. The low voltage wiring to the princess telephone power transformer was ordinary cat 3, two-pair telephone wire. A Complete Guide to Telephone Cable. Selling Price: Rs. FIRST LETTER (Not Applicable) SECOND LETTER (Insulation) THIRD LETTER (Gauge) FOURTH LETTER (Sheath) A: PULP: Copper: Aluminum: Gauge: A - Alpeth: B: D-Pulp: J . Bd , J-Y(St)Y . pairs must be twisted together and the top color table is used. Good wire cutters are essential when cutting BT Dropwire.This cable is heavy duty to cope with any kind of weather. DUNS: 080314274 . Older telephone wiring was a basic Cat-3, 4 conductor or 2-pairs with red, green, black, yellow. By: ScottMac. Group 1: Group 2 white: blue red: orange black: green yellow: brown violet: slate Color codes for 25-pair cables. Phone: 1-888-651-9990. This will cause the loop to close on itself and make a better connection. Pair Color 1 black + red 2 black + white 3 black + green 4 black + blue 5 black + yellow . For products that will be shipped via LTL, you will be provided with a set of Accessorials to select from to provide Anixter with additional shipping considerations, such as residential delivery, inside delivery, liftgate or limited access. $800 - $900 + View All. So for one phone line, the blue pair should be the correct line to connect to. This will allow for 625 wire pairs in a cable. Liftgate - Freight carrier provides liftgate service, if needed, to load and unload a shipment when loading/unloading docks are not available. Color Code Charts 1 Black 2 White 3 Red 4 Green 5 Brown 6 Blue 7 Orange 8 Yellow 9 Purple 10 Gray 11 Pink 12 Tan 18 Gage conductors in cables 8446 through 8449 are Black and White. 1308. One pair of wires is used for one telephone line. Wiring Faults Telephone line dead or similar issues Most homes with a landline will have a master socket called an NTE5A, this socket has a concealed test socket in which you can plug in a phone to test the line. (adsbygoogle = window.adsbygoogle || []).push({}); This is the Telephone Wiring Colour Code for the NTE5 BT Master Socket, with the cable feeding extension sockets attached to the customer removable front plate.