... , 7X24 fom family pdh fiber optical multiplexer FOM is HWATEL Corp PDH optical multiplexer serial equipment. FOM consist ... V.35, V.24, RS-232, lease line, E&MPower supply support AC+DC redundancySupport 850 nm, 1310 ... range from 1 Km to 120 KmOptional secondary fiber optical link provides 1+1 automatic backupSupport single ... +1 4 / 8 / 16 E1 PDH Multiplexer, Optical Fiber Multiplexer, Fiber Optic Modem