Terminal Server Operational in Bridge and Router Modes
VLAN and IP address Configuration per Terminal Server in Bridge Mode
In all network applications of a converged IP network where serial interfaces are part of an IP network, the
remote Terminal Server or IP Terminal Server (generally configured in Base station) associated to a serial
interface is part of a SCADA service and as a standalone service.
The Aprisa SR+ allows Terminal Server and IP Terminal Server service to be segregated from the management
service both in VLAN, IP and QoS in Bridge mode. It allows the user:
• complete separation of SCADA and management network in term of VLAN and IP subnet
• complete separation of SCADA and management network in term of VLAN
• complete separation of SCADA and management in term of IP subnet
• a unified network with single IP subnet
Since Terminal Server is part of the bridge network, it supports gratuitous ARP and ARP reply to ARP request.
It also supports fixed user configuration of serial port QoS per VLAN Priority (QoS PCP bits).
The following are examples of Terminal Server and IP Terminal Server in a bridge network;
IP and VLAN segregation of remote Terminal Server and radio management
The following figure describes the IP and VLAN segregation of remote Terminal Server and radio management
where the Terminal Server in remote 1 and 2 are configured with different VLANs from the management
VLAN and on the same IP address subnet as the RTUs different to the IP address subnet of the radios. Thus,
in fact it’s two separated logical networks reside on the same physical network (as show in bottom of the
figure).
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