Maintenance: international voice frequency telegraph and facsimile, international leased circuits. Recommendations M.800-M.1235, Volume 4, Part 4
International Telecommunication Union, International Telegraph and Telephone Consultative Committee. Plenary Assembly
International Telecommunication Union, 1981 - Technology & Engineering - 67 pages
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4-wire circuit Administrations concerned amplitude-modulated Annex CCITT Recommendation Characteristics circuit sections dBm0 dBm0p direction of transmission echo suppressors exceed Fascicle IV.4 Figure frequency modulation given in Recommendation group or supergroup group-delay distortion Impulsive noise international circuit international leased circuits international leased group international line international main sections international telephone circuits international voice-frequency telegraph limits given line-up loss at 800 loss/frequency distortion maritime centre maritime satellite circuit maritime satellite system measuring instrument microwatts multiterminal national and international noise measuring noise power nominal overall loss otherwise unspecified phase jitter phototelegraph transmission power level power per telegraph psophometric Recommendation cited Recommendation M.1020 Recommendation M.810 reference frequency renter's premises repeater stations special quality circuits specified sub-control stations supergroup link telegraph channel telephone-type circuits terminal equipment terminal international centre terminal national centre terminal national section test call transmitted voice-frequency telegraph link voice-frequency telegraph systems wide-spectrum signals zero relative level