PSTN + PILOT CABLE (LEASED LINE) MODEM; (10-30 VAC, 10-60 VDC) DIN RAIL MOUNT; RS485/232;INDUSTRIAL TEMP OPERATING RANGE (-25 TO +70C)B103,212,V21,V22,V22B ,V23C,V23HDX,V32,V32B,V34;GALVANIC ISOLATION B/W COMMS PORT & PSU;USE CHEAPER SC 23037 IF ONLY NEED RS232/PSTN;LIMITED AVAILABILITY OF PSTN MODEMS MEETING REQUIRED SPECIFICATION & INTEROPERABILITY;REFER APPROVAL FOR LIMITED SOURCING FOR DETAILS;ITEM REPLACES SC 18752 FOR PILOT CABLE