1、INTERNATIONAL TELECOMMUNICATION UNION)45G134 1 TELECOMMUNICATIONSTANDARDIZATION SECTOROF ITU30%#) orii) if the range field is coded all zero, the reset of the circuit group has been started and the reset state ofeach circuit concerned will be reported by the appropriate call, circuit or circuit grou
2、p supervisionsignal/message.3.8 Automatic congestion control signalsSignals generated by the exchange to indicate that a congestion threshold has been exceeded (seeRecommendation Q.542, 5.4.5).3.8.1 Congestion level 1A signal indicating that the first (less severe) congestion threshold in an exchang
3、e has been exceeded.12 Fascicle VI.8 - Rec. Q.7223.8.2 Congestion level 2A signal indicating that the second (more severe) congestion threshold in an exchange has been exceeded.References1 CCITT Recommendation Characteristics of the dial tone, ringing tone, busy tone, congestion tone, specialinforma
4、tion tone and warning tone, Rec. Q.35.2 CCITT Recommendation Facilities provided in international semiautomatic working, Rec. Q.101.3 CCITT Recommendation Determination of the moment of the called subscribers answer in the automaticservice, Rec. Q.28.4 CCITT Recommendation Basic technical problems concerning the measurement and recording of calldurations, Rec. E.260.5 CCITT Recommendation Special release arrangements and indication of congestion conditions at transitexchanges, Rec. Q.118.
