Kev ua txuj ci ntawm xov tooj

1. Ua haujlwm zaus: 300 ~ 3400 hz
2. Pulse ntawm / Tawm Ratio: 1.6 ± 0. 2: 1
3. Dual audio Dialing zaus ua haujlwm: tsawg dua lossis sib npaug ± 1.5%
4. Dual audio teeb liab qib: ① tsawg zaus pab pawg: -9 ± 3db; ② Cov Pab Pawg Loj Siab: {{{}} ± 3db; Cov khoom siv ntau zaus hauv cov zaus ua ke yog 2 ± 1DB siab dua qhov tsawg zaus feem ntau
5. Ringing Suab nrov: ntau dua lossis sib npaug nrog 70dB (a)
6. ElectroAmousic Performance:
① ntawm 0 mais, objectively xa cov ntaub ntawv sib npaug ntau dua lossis sib npaug rau {1}}; Nyob rau ntawm 3 mais, objectively xa cov khoom sib npaug tsawg dua lossis sib npaug rau +15; Thaum 5 mais, objectively xa cov khoom sib npaug tsawg dua lossis sib npaug rau +15.
② ntawm 0 mais, lub hom phiaj tau txais sib npaug yog ntau dua lossis sib npaug {1}}; Nyob rau ntawm 3 kis lus mev, lub hom phiaj tau txais cov sib npaug yog tsawg dua lossis sib npaug ntawm +2; Ntawm qhov deb ntawm 5 km, lub hom phiaj tau txais kev sib txig sib luag yog tsawg dua lossis sib npaug {5}}.
③ ntawm 0 mais, lub hom phiaj supetone siv sib npaug yog ntau dua lossis sib npaug {1}}; Nyob rau ntawm 3 kis lus mev, lub hom phiaj supetone siv sib npaug yog ntau dua los yog sib npaug rau +10; Thaum 5 mais, lub hom phiaj supetone siv sib npaug yog ntau dua lossis sib npaug rau {5}}.