This hypothetical reference circuit is 5000 km long and applies to various types of carrier systems on coaxial cable and radio-relay systems, specially designed for very long international circuits. It has, for each direction of transmission, a total of: one pair of channel modulators which includes translation from the audio-frequency band to the basic group and vice versa; three pairs of group modulators, each pair including translation from the basic group to the basic supergroup and vice versa; six pairs of supergroup modulators, each pair including translation from the basic supergroup to a higher order modem and vice versa; twelve pairs of higher order modulators, each pair providing the necessary modulation stages to and from the line frequency.
ITU-T G.215 SPANISH-1993由国际电信联盟 IX-ITU 发布于 1993-01-01。
ITU-T G.215 SPANISH-1993 在中国标准分类中归属于: M42 通信线路设备。
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