TIU CHUN VIT NAMTCVN 8240:2009THIT B U CUI VIN THNG - THIT B U CUI TNG T S DNG T HP CM TAY NI VI MNG IN THOI CNG CNG (PSTN) - YU CU IN THANHTelecommunication Terminal Equipment Analogue handset terminal equipment connecting to the Public Switched Telephone Network (PSTN) - Electro-acoustic requirementMc lc1.Phm vi p dng 62.Ti liu vin dn63.Thut ng, nh ngha, k hiu v ch vit tt 63.1Thut ng, nh ngha 63.2K hiu 73.3Ch vit tt 84.c tnh k thut 84.1Yu cu chung 84.1.1Khng ph thuc vo cc tnh 84.1.2iu kin cp ngun 84.1.3Ngun cung cp 84.1.4iu chnh m lng 84.2c tnh cht lng thoi 94.2.1 nhy/p ng tn s 94.2.2Mc m lng 104.2.3Trc m 114.2.4Mo 114.2.5 tuyn tnh (bin thin h s khuch i theo mc vo) 114.2.6Tp m 114.2.7Tnh n nh124.2.8Suy hao phn x ting vng (ERL) 125.Phng php o kim 125.1iu kin o kim 125.1.1iu kin mi trng 125.1.2 chnh xc ca cc php o v thit b o 125.1.3Th t cc php o 135.1.4Mi trng in thanh135.1.5V tr t t hp 135.1.6Mc o135.1.7iu chnh m lng135.1.8Yu cu v thit b o 145.1.9Cc phng php o khc 145.1.10Cu hnh o 145.2Cc php o c tnh cht lng thoi 165.2.1 nhy 165.2.2Mc m lng 185.2.3Trc m 195.2.4Mo 205.2.5 tuyn tnh 215.2.6Tp m 215.2.7Tnh n nh 225.2.8Suy hao phn x ting vng (ERL) 23Ph lc A (Quy nh) Phng php tnh24Ph lc B (Tham kho) Bng i chiu ti liu vin dn28Li ni uTCVN 8240:2009 c xy dng trn c s chuyn i tiu chun ngnh TCN 68-211:2002 Thit b u cui tng t s dng t hp cm tay ni vi mng in thoi cng cng (PSTN) - Yu cu in thanh ca B Bu chnh, Vin thng (nay l B Thng tin v Truyn thng).TCVN 8240:2009 c xy dng trn c s chp nhn p dng ti liu TBR 38 (05/98) ca Vin Tiu chun Vin thng chu u (ETSI) v tham kho mt s Khuyn ngh ca Lin minh Vin thng Th gii (ITU-T).TCVN 8240:2009 do Vin Khoa hc K thut Bu in bin son, B Thng tin v Truyn thng ngh, Tng cc Tiu chun o lng Cht lng thm nh, B Khoa hc v Cng ngh cng b.THIT B U CUI VIN THNG - THIT B U CUI TNG T S DNG T HP CM TAY NI VI MNG IN THOI CNG CNG (PSTN) YU CU IN THANHTelecommunication Terminal Equipment Analogue handset terminal equipment connecting to the Public Switched Telephone Network (PSTN) - Electro-acoustic requirement1. Phm vi p dngTiu chun ny qui nh cc yu cu v in thanh v phng php o nh gi ph hp i v i cc thit b u cui tng t cung cp dch v thoi s dng t hp cm tay ni vi giao din tng t 2 dy ca mng in thoi cng cng (PSTN). Cc yu cu trong tiu chun ny nhm m bo cht lng thoi c bn v tnh tng thch v mt s dng ca cc thit b u cui tng t.Tiu chun ny khng p dng cho cc thit b u cui s dng t hp cm tay kt ni bng v tuyn (v d in thoi ko di).2. Ti liu vin dn[1]ETSI TBR 38 (05/98), Public Switched Telephone Network (PSTN); Attachment requirements for a terminal equipment incorporating an analogue handset function capable of supporting the justified case service when connected to the analogue interface of the PSTN in Europe (Mng in thoi chuyn mch cng cng (PSTN); Cc yu cu km thm i vi thit b u cui c t hp cm tay tng t kt ni vi giao din tng t ca mng PSTN chu u).[2]ETSI I-ETS 300 480, Public Switched Telephone Network (PSTN); Testing specification for analogue handset telephony (Mng in thoi chuyn mch cng cng (PSTN); c t o th my in thoi c t hp cm tay tng t).[3]ITU-T Recommendation P.64 (09/99), "Determination of sensitivity/frequency characteristics of local telephone systems (Khuyn ngh ITU-T P.64, Xc nh c tnh tn s/ nhy ca cc h thng in thoi ni b).[4]ITU-T Recommendation P.51 (08/96), Artificial mouth (Khuyn ngh ITU-T P.51, Ming gi).[5]ITU-T Recommendation P.57 (11/05), Artificial ears (Khuyn ngh ITU-T P.57, Tai gi).[6]IEC 651, Sound level meters (Dng c o mc m thanh).[7]ISO 3 (1973), Preferred numbers - Series of preferred numbers (Cc s c a thch Cc lot s c a thch).[8]ITU-T Recommendation P.79 (09/99), Calculation of loudness ratings for telephone sets(Khuyn ngh ITU-T P.79, Tnh ton mc m lng ca cc my in thoi).[9]ITU-T RecommendationO.41 (10/94), Psophometer for use on telephone-type circuits(Khuyn ngh ITU-T O.41, Tp nhiu thc trong cc mch in my in thoi).[10]ITU-T Recommendation G.122 (03/93), Influence of national systems on stability and talker echo in international connections (Khuyn ngh ITU-T G.122, nh hng ca cc h thng quc gia i vi n nh v ting vng trn cc kt ni quc t).3. Thut ng, nh ngha, k hiu v ch vit tt3.1Thut ng, nh ngha3.1.1