fom480 fiber optic mutiplexer flexible configuration meet the need of applications foreign abroad. though it is 19 inches in width and 1u in height, it is different from other pdh which is manufactured by other companies. all of the unit cards are hot swappable. a big quantity of this type exported. either appearance or performance has good quality. fom8e1ab(omt240m) optical transmission equipment omt240k optical-electronic multiplexer.