Specifications
72 / 80
18.1. Scenario 1, public access point with M2M GW
1. Arctic receives an IP address from cellular network. Typically this IP address is a dynamic,
private IP address that is S-NATed, while going to the Internet
2. Arctic connects to M2M GW via operator's public access point using the IP address
received from cellular network.
3. A VPN tunnel is conformed between the Arctic and M2M GW.
4. Subsequent communication is going through the VPN tunnel.
18.2. Scenario 2, private access point with M2M GW
1. Arctic receives a static IP address from cellular network.
2. Arctic connects via operator's private access point and company's access server to the
M2M GW.
3. A VPN tunnel is conformed between the Arctic and M2M GW.
4. Subsequent communication is going through the VPN tunnel.
18.3. Scenario 3, private access point with Arctics only
1. Two or more Arctics are connected to each others via operator's private access point.
2. Static IP addresses are provided by cellular network.
3. D-NAT and S-NAT are used for routing the packets to devices residing at Arctics' LANs.
19. Appendix C: Acronyms and abbreviations
APN Access point name
Baud, Bd Symbols or pulses per second, see BPS. Note that in e.g. modems, the BPS rate
may differ from nominal Baud rate because of compressing technologies.
BPS Bits per second
Browser A program used to view e.g. HTML content (browsing e.g. Internet)
CAT5 Category 5 cable (refer to ANSI/EIA-568-A, TSB-95)
Certificate In this context, a digital signature of a server for identifying itself with public key.
Cross-
connected Connecting RX to TX of other device and vice versa
DIN Deutsches Institut für Normung (German institute for standardization)
EDGE Enhanced data rates for GSM evolution
(http://gsmworld.com/technology/edge.htm
)
Ethernet Networking technology, (see IEEE 802.3)
GPRS General packet radio service
GRE Generic routing encapsulation
GUI Graphical user interface (see Webmin)
HTTP Hypertext transfer protocol
HTTPS SSL-protected Hypertext transfer protocol
IEC-101 Formerly known as IEC 60870-5-101
IEC-104 Formerly known as IEC 60870-5-104
IP Internet Protocol
IP v.4 Internet Protocol version 4, currently used protocol
IT Information Technology
LAN Local area network
Linux An operating system
M2M Machine to machine
Modbus Serial communications protocol
OS Operating system, such as Windows or Linux.
Parity Error detecting code, where a change in data is detected
PIN Personal identification number
Ping, ICMP Internet control message protocol, typically used for sending ping "echo packets"
PPP Point to point protocol
PSTN Public switched telephone network, “land line”