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Appendix I Remote Access (Tunneling)
To "tunnel", in this context, is to transmit data between two points through a private
conduit on a shared or public network. The network could be an Ethernet LAN, a
WAN, or the Internet. The iServer allows for a connection between a serial device
and a PC, or between two serial devices, using an existing network rather than
dedicated wiring.
Today, there are number of serial devices like sensors, gauges, PLCs, card readers,
security alarms, barcode scanners, data loggers, video cameras, ATM machines,
time & attendance terminals, medical lab equipments, electronic signboards, and
many others that are directly connected to PCs via their serial ports. These devices
can be attached to shared Ethernet networks (TCP/IP protocol) and get accessed,
controlled, and managed remotely using the iServer products.
Any two iServer’s can talk to each other over the Ethernet LAN, WAN, and Internet
using TCP/IP protocol. Therefore, the connected serial devices to iServer’s can also
communicate with each other back and forth over these networks. This characteristic
is called Tunneling and it’s illustrated in Figures I.1 and I.2.
Figure I-1a Serial Tunneling - iSeries -C4EIT
Figure I-1b Serial Tunneling - iSeries -EIT
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