Introduction to the RLXIC-SG
RLXIC-SG
♦
Intelligent Cellular
User Manual
RadioLinx Intelligent Cellular Serial Modem for Global GPRS/GSM
ProSoft Technology, Inc.
Page 11 of 136
May 29, 2009
If you need to contact your RLXIC-SG, a device connected to the RLXIC-SG, or
a host system using the RLXIC-SG from the Internet, you need to have a known
IP (such as one which is static) or domain name (an IP address which is
converted by a DNS server into a word based name). If you have a dynamic IP
address for your modem, you can use a Dynamic DNS service (such as IP
Manager) to translate your IP address into to a domain name.
Caution:
If you want to connect remotely to your RLXIC-SG using TCP/IP, the IP address given to
your modem by your cellular provider cannot be a private or internal IP address (such as a custom
APN or special private network Data Link) unless you are on the same network or inside that
network's firewall (such as with frame relay).
1.4 GSM
GSM Networks use SIM cards which are smart cards containing the account
holder's details. A SIM can generally be moved from one device to another
allowing for account portability and flexibility.
1.4.1 GPRS
General Packet Radio Service (GPRS) is packet-switched with many users
sharing the same transmission channel, but only transmitting when they have
data to send. This means that the total available bandwidth can be immediately
dedicated to those users who are actually sending at any given moment,
providing higher utilization where users only send or receive data intermittently.
GPRS provides speeds of 30- to 70 kbps with bursts up to 170 kbps.
Summary of Contents for RLXIC-SG
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