The six position RJ-11 style modular plug is traditionally used in voice/phone applications. Two versions are available: 6P6C (six position/six contact) and 6P4C (six position/four contact). The RJ-11 6P4C (four contacts) is used for 1 or 2 line phone systems common in residential systems. The RJ-12 6P6C (six contacts) is used for 1, 2, or 3 line systems and is found in more commercial systems. Modular plug connectors support the latest TIA/EIA standards for twisted pair cabling. IDEAL modular plugs are designed to work seamlessly with the IDEAL Telemaster™ series of modular plug crimp tools. Plugs are designed and manufactured to support all 100-ohm cable wiring schemes.