USRobotics® Courier® M2M 3G GSM Cellular Modem with GPS
PTCRB Approved , GSM/GPRS/EDGE/HSPA+
Genel Bakış ve Özellikler Spesifikasyonlar Accessory Kits FAQs Bilgi Dokümanı Destek
Why can't I use any cellular modem as a drop-in dial-up modem replacement?
Most cellular networks use a different type of technology that isn't compatible with dial-up analog systems. Our Whitepaper explains in detail the how's and why's but the high level answer is that most cellular data networks are packet based, rely on IP addresses, and are client/server whereas dial-up systems are peer-to-peer direct connection and rely on phone numbers which normally cannot communicate without additional hardware and/or software that could complicate how a solution works.
USRobotics does offer a unique solution that emulates a dial-up modem over a cellular connection that can allow a true drop-in solution. See the USRobotics Courier® Modemulator & Cellular Gateway for more information.
Learn more with the Cellular to Cellular Data Communications White Paper
How much can I expect to save by replacing analog modems with cellular modems or gateways?
The cost of analog phone lines is on average $50 per month per line in North America. Cellular services when pooled can provide even greater cost savings with small data packages and low data volumes. The cost savings increase as the volume goes up, whereas the dial-up monthly expenses are consistent but pricey.
Can I use the SIM from my phone for a cellular modem or gateway?
Possibly. Depending on how your SIM is provisioned, it may allow a cellular modem or gateway to originate a connection to the IP address of a TCP/IP server on the Internet. If your SIM does work, you won't have M2M features like static IP address, data pooling, peer-to-peer routing, or host-to-device VPN.
Can I connect to the IP address reported by the USR3500?
When the cellular service is provided by a Mobile Network Operator (MNO), the IP address reported by the USR3500 AT$IP command may be public and routable. Normally this IP address provided by the MNO will be dynamic so it will change periodically, and the MNO may block access to this IP address with a firewall.
When the cellular service is provided by a Mobile Virtual Network Operator (MVNO), the IP address reported by the USR3500 AT$IP command is not public and routable. The reported IP address is used only by the MVNO to contact the cellular network. The MVNO will translate the IP address using Network Address Translation (NAT) and provide you with a different routable IP address. The USR3500 cannot report that IP address. The MVNO will control whether your IP address is private or public, and static or dynamic.
* Services dependent on MVNO partnership for qualified customers, subscriptions may be required.