Hach-Lange SC 1000 Controller Enhanced Communications - Manual (Page 28)

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Installation
3.7 Establish a GPRS connection via fixed IP VPN server
There are problems associated with connecting a sc1000 controller within a corporate
network via a VPN tunnel. An external fixed IP service that assumes the roles of VPN
server and interface to the mobile network operator is therefore a viable alternative.
If a fixed IP service is used, the sc1000 controller is assigned its own fixed IP address,
from which it can be accessed via the Internet. This address does not change.
A fixed IP connection such as this can be Ethernet or GPRS-based ( Figure 21 ). Costs
incurred for the use of GPRS/mobile network are billed based on the volume of data
transmitted and the frequency with which this occurs.
Figure 21 Establish a GPRS connection via fixed IP VPN server