Modem (PSTN) Products

Industrial modems in sealable housing
Internal PSTN PCI & ISA Cards 
Active PSTN PC Cards
Desktop PSTN Fax/Modems
DINrail PSTN Modems
19" Rack Mountable PSTN Modems
Build in Serial PSTN Modems, I-Modules & Socket Modules

ISDN Products

Internal ISDN Cards
ISDN I-Modules & Socket Modules
ISDN PC Cards (passive and active)
ISDN Terminal Adapters
ISDN Multi Protocol Routers (MPR)

GSM & GPRS (with I/O for automated communication)

GSM/GPRS Modems in sealable Housings
DIN-rail GSM and GPRS Modems 
19" Rack GSM and GPRS Modems
RTU
GPRS PC Cards