PDH optical transceiver (Plesiochronous Digital Hierarchy, quasi-synchronous digital series) bụ obere ikike transceiver ngwa anya, ngwa jikọtara ọnụ, nke a na-akpọkwa ngwa-na-atụ, na ikike bụ n'ozuzu 4E1, 8E1, 16E1.Ọzọ, JHA TECHNOLOGY ga-ewebata advan...
GỤKWUO