PDH fiber optical equipment E1 Ethernet V.35 Video RS232 Over 20 years 50 countries OEM to HUAWEI , ZTE ... optical multiplexer serial equipment. FOM consist of Standard PDH, network PDH, Optical APS PDH, Optical MODEM, Multi Service PDH, Voice PDH ... 16 ports E1, 4 ports Giga Ethernet PDH--------------- E1 Data Video Multiservice Service Bybrid PDH ---------------------------FOM-4E1-4E-V35: 4 ports E1 ...