Izilinganiso zendawo ezivalekile ezivimbela ukuqhuma ezivame ukwamukelwa ezimbonini i-IIB ne-IIC.
Imikhiqizo engaqhumi ihlukaniswe yaba izinhlobo ezimbili, dI kanye ne-dIIBT4:
I-dI yakhelwe izindawo okungezona ezezimayini ezimayini zamalahle.
I-dIIBT4, esetshenziswa kuzilungiselelo zokukhiqiza, ilungele ingxube yegesi eqhumayo ehlelwe ngaphansi kwamakilasi IIA kanye ne-IIB, kusukela kuQembu T1 kuya ku-T4. Lo mkhiqizo uthobela izidingo ezijwayelekile ze-JB/T8528-1997. Amamodeli angaqhumi ahambisana nakho kokubili izinga le-GB3836.1-2000 kanye ne-JB/T8529-1997 ejwayelekile.