| 摘要 |
PCT No. PCT/FR85/00331 Sec. 371 Date Jul. 21, 1986 Sec. 102(e) Date Jul. 21, 1986 PCT Filed Nov. 22, 1985.In an apparatus, a passive equipment is designed to transmit informations on a telephone line, indicating energization of the apparatus, hook-off condition, insertion of a prepaid credit, collection of part of the credit, or operating anomalies. An active equipment is located to be inaccessible to the public and close to the central office, and performs establishment, holding and management of telephone communications seized by the apparatus, in order to perform a permanent check on the conformity of various phases of a communication and to ensure dependance of continued communication upon information transmitted by the apparatus. On the telephone line, the information is transmitted within a frequency band differing from the communication frequency (voice) band so as not to affect the communication signals. |
