Chipangizochi chimapereka mawonekedwe a 1-16 Channel E1, Standard 2 waya telefoni ngati engineering order-waya (posankha).Imasinthasintha kwambiri.Ili ndi ntchito ya alamu.Ntchitoyi ndi yodalirika, yokhazikika, komanso yotsika mphamvu yogwiritsira ntchito mphamvu, kuphatikiza kwakukulu, kukula kochepa.