iSG4F
User’s Manual
iS5 Communications Inc.
99
A example, console ports of remote devices to be reached via terminal server service using
telnet from any PC with Ethernet link.
In the drawing below the management station (PC) is a Telnet client which requires being able
to manage the remote RTUs with a text based shell method.
The PC is an Ethernet device connected locally to the router A.
Router A acts as a telnet server towards it. A telnet session is hence established between the
PC and the router.
Up to 100 such sessions can simultaneously be supported, uniquely identified by their TCP
Port numbers.
It is possible to support P2MP in 2 modes:
Over the same service using the same TCP port number.
Over different services using multiple TCP sessions each with a different TCP port.
The user will configure services ,to determine which RTU is to be addressed via which telnet
session.
In bellow example Serial transparent tunneling (UDP|TCP traffic) will take place between the
iS5 routers thus establishing the paths from the serial RTUs to router A . Using the mapping
between the telnet sessions and the serial services the application will direct the traffic from
the management station to the RTUs allowing each its own path for management.
Below is a second option at which the terminal servers are set at the remote router where
the serial devices are connected locally.
The benefit in this scenario is having a TCP session over the IP network.