supply of 1u height tdm multiplexer v.21/v.23 to e1 standard 19 rack mountable diviceconsisting of e1 port and two v.21 interface with autochangeover quad ports, units to support potential freecontacts four numbers can be linked with dlg/rtu for e1 status,quad status & power supply status unitsupports dc power supply 18 v dc to 72v dc range & ac vide dc to ac adaptor one number providedaccepted make/brand/teamlink or similar .
