Sisitemu igizwe na 3 ikoreshwa kumurongo winsinga cyangwa umugozi wa spacer, yakozwe, igeragezwa kandi ikanashyirwaho ikimenyetso hakurikijwe ICEA S-121-733, igipimo cya Tree Wire na Messenger Gishyigikirwa Umuyoboro.Sisitemu igizwe na 3 igizwe ningabo ikingira (layer # 1), ikurikirwa no gutwikira ibice 2 (ibice # 2 na # 3).