PDH fiber optical equipment E1 Ethernet V.35 Video RS232 Over 20 years 50 ... PDH Family Overview FOM is HWATEL PDH optical multiplexer serial equipment. FOM consist of Standard PDH, network PDH, Optical APS PDH ... : E1, Ethernet, FXS, FXO, V.35, V.24, RS-232, lease line, E&M, VideoSupport 850 nm, 1310 nm and 1550 ... -STM1: 1 port DS3 Electric to optical converter modem Optical Equipment