ITU-T G.325 FRENCH-1993 GENERAL CHARACTERISTICS RECOMMENDED FOR SYSTEMS PROVIDING 12 TELEPHONE CARRIER CIRCUITS ON A SYMMETRIC CABLE PAIR [(12 + 12) SYSTEMS]
Systems of the (12 + 12) type on symmetric pair in cable are used for carrier working either on old deloaded cables or on cables specially constructed for the purpose (without a second cable being required). These systems may be used in regional or local relations, or in long-distance relations, trunk or international.
ITU-T G.325 FRENCH-1993 Referenced Document
ITU-T G.326 Typical Systems on Symmetric Cable Pairs ((12 + 12) Systems) - International Analogue Carrier Systems (Study Group XV; 3 pp; Cancelled)
ITU-T G.325 FRENCH-1993 history
1993ITU-T G.325 FRENCH-1993 GENERAL CHARACTERISTICS RECOMMENDED FOR SYSTEMS PROVIDING 12 TELEPHONE CARRIER CIRCUITS ON A SYMMETRIC CABLE PAIR [(12 + 12) SYSTEMS]