PairFinder:Copper&Fiber Colors

PairFinder is the telephone cable color code reference built by a telephone tech, for telecom techs — splicers, installers, repair techs, linemen, OSP engineers and anyone working copper or fiber plant. It is also a DSL troubleshooting toolkit for DSL technicians: DSL speed by loop length, bridged tap loss and VDSL band plans, offline. Type a pair number and get the copper color code in a tap: binder group, tip and ring colors, super binder. No account, no ads, no tracking, and it works offline — in the vault, the manhole or the back of a pedestal with no signal. COPPER COLOR CODE (TELEPHONE CABLE) • Pair lookup, 1–4,200 — super binder, binder group and tip/ring colors, plus ranges like 101–126 • The standard Bell 25-pair color code (the twenty-five pair code, white-blue through violet-slate) and every binder above it • Visual picker — drill down by the colors you see: super binder → binder → pair • Every telephone color code standard — Bell 25-pair, Odd-Count PIC, Japanese NTT, Bell Toll (pre-1950) and Adtran 32-pair • Clocked / mirrored cable splicing reference • Cable makeup — build a cable's counts and dead pairs, look up by physical pair or assigned count • Terminal assignment and splice / cable planner PHONE, NETWORK & DSL WIRING COLOR CODES • Phone wire color code for inside wire: flat satin (Cat 1), quad and Cat 3 station wire • Ethernet / network color code: RJ45 T568A and T568B pinouts for Cat 5e, Cat 6, Cat 6a, Cat 7 and Cat 8 cable, including the AT&T 258A order that became T568B • RJ11, RJ14 and RJ45 jack wiring, and connecting old telephone wire to structured cabling • DSL wiring: which pairs carry the line, bridged taps on inside wire, and why Cat 3 and flat satin hurt VDSL DSL TOOLS, TESTING & TROUBLESHOOTING • TDR distance to fault from round-trip time and velocity factor • Resistive fault distance and Murray loop calculators • Bridged-tap loss for every DSL profile (POTS, ADSL2+, VDSL2 8b/17a/35b, G.fast), computed from a real twisted-pair line model, with the notch frequency • DSL speed calculator: ADSL2+, VDSL2 and G.fast speed estimates by wire gauge, loop length, pair bonding and vectoring • DSL band-plan spectrum view and DSL troubleshooting for slow or dropping copper DSL lines • Pair diagnostics, loop resistance, air pressure and conduit fill references COPPER ENGINEERING & NOISE MITIGATION • Copper noise mitigation: power influence, longitudinal balance, crosstalk, bonding and grounding • Load coils, wire gauge and loop resistance for copper telecom outside plant (OSP) engineering FIBER COLOR CODE • TIA-598 fiber color code lookup — buffer tube, tracer and strand color by position, for 6/12/24 fibers per tube, ribbon and tight buffer, up to 3,456 fibers • Fiber picker — cable type → tube or ribbon → fiber • Jacket colors, cable types and a connector reference • Cable ID — decode copper and fiber cable jacket markings BUILT FOR THE FIELD • Fully offline after the first launch • Big touch targets, a Back button that does what you expect, pinch-zoom • Light, Dark, Legacy Bell and Color Blind (patterned) themes • 17 languages, including English, Spanish, Portuguese, French and German • No account, no ads, no tracking FREE vs PRO Free covers the full 25-pair color code (pairs 1–25), fibers 1–12 and the color references. PairFinder Pro is a single one-time purchase — no subscription — that unlocks every pair, every standard, all fiber types and all tools. It is tied to your Google Play account and restores automatically on a new phone. Whether you call it the phone color code, the telco color code, the Bell System color code or the 25 pair color code, PairFinder has it in your pocket. PairFinder is a reference aid: always verify against cable markings, your employer's practices and your test equipment. Calculator results are estimates. PairFinder is not affiliated with AT&T or any other telephone company. Questions or a standard you'd like added? [email protected]