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The USRobotics Courier Modemulator Expansion Card, when used with the USR M2M Cellular Gateway, is a drop-in cellular replacement for legacy analog systems that require peer-to-peer connectivity. Emulating a dial-up modem allows equipment to seamlessly connect over a cellular network instead of over the PSTN in legacy M2M applications. Existing legacy hardware and software systems remain untouched when used with the Modemulator — providing extended product life and simplified cellular deployments. Compatibility with both the PSTN and packet switched data networks provides network flexibility that allows an open ended transition plan and eliminates the need for a system overhaul — saving both time and money. By providing a 2-in-1 device, analog customers can transition select sites to cellular in the most efficient and cost-effective way while utilizing the network that is right for the situation. USR's Modemulator provides reliable, secure connections for mission critical M2M applications.