2.3.3 Extension ConnectionTelephone WiringExtension jacks 1 through 4 are for all kinds of telephones.Extension jacks 5 through 8 are only for digital proprietarytelephones. To make extension jacks 5 through 8 usable for allkinds of telephones, a 4-SLT Extension Expansion Card (KX-TD30870) must be installed.The maximum length of the extension line cord (twisted cable)which connects the system and the extension is as follows:Diameter of the line Max. lengthStandard Telephone 22AWG 1798m (5900 feet)24AWG 1128m (3700 feet)26AWG 698m (2290 feet)Proprietary Telephone 22AWG 360m (1180 feet)24AWG 229m (750 feet)26AWG 140m (460 feet)2 or 4-conductor wiring is required for each extension as listedbelow. There are four pins for possible connection: “T”, “I?‘, “Dl”and “D2”.T: Tip Dl: LowR: Ring D2: HighTelephone W i r i n gStandard telephones 1 pair wire (T, R)Digital proprietary telephone(e.g., KX-T7230, KX-T7235)1 pair wire (Di, D2) or2 pair wire (DI, D2, T, R) for extra Device PortAnalog proprietary telephone(e.g.,KX-T7030,KX-l7130) 2 pair wire (Di, D2, T, R)Note l If a KX-TD30870 is installedNote the jack numbers for the facsimile and standard telephone whichhave Caller ID service.l If a telephone or answering machine with an A-Al relay is connected tothe system, set theA-Al relay switch of the telephone or answering machine to the OFFposition.2-12 Installation
