7705 SAR Interfaces
180
Interface Configuration Guide
3HE 11011 AAAC TQZZA Edition: 01
A raw socket local host (acting as a server) at the 7705 SAR-H/Hc substation listens
to TCP sessions that originate at the 7705 SAR-8/18 central location network
operations center (NOC). The 7705 SAR-8/18 at the NOC is connected to two
front-end processors (FEPs), one via a serial port and another via an Ethernet port.
The serial port on the 7705 SAR-8/18 is configured as a remote host (acting as a
client) that initiates TCP/UDP sessions towards the RTU at the 7705 SAR-H/Hc
substation when traffic is received from the FEP over the serial port. These TCP/UDP
sessions are transported over the IP/MPLS network using IP transport service over
an IES or VPRN service. The serial data that is transported over the TCP/UDP
session and received at the 7705 SAR-H/Hc is then sent over the serial link towards
the RTU. TCP/UDP sessions received from the FEP over the Ethernet port are
transported over an IES or VPRN service (that is, there is no need for serial remote
host configuration in this case).
Multiple FEPs can poll a single RTU. If multiple sessions attempt to transmit serial
data on the serial port simultaneously, the 7705 SAR queues packets per session
and ensures that all data for one session is sent out before processing another
session’s data, ensuring that sessions do not overlap one another.
Figure 26 Serial Transport Over Raw Socket Application
Note: A serial port can be concurrently configured as both a server (local host) and a client
(remote host). This is accomplished with the local-host command configuration to support
the server function and the remote-host command configuration to set up client sessions
to far-end remote hosts.
Local host IP:
x.x.x.x
Local host IP:
y.y. y.y
RTU/IED
RTU/IED
RTU/IED
7705 SAR-H/Hc
Port: 5002
Port: 5001
Port: 5000
Layer 3
IP/MPLS
Services
(VPRN, IES)
Serial
7705 SAR-8/18
Port: 1025
Port: 1026
IP: z.z.z.z
Port: 1027
SCADA
Management systems,
Front-end Processors
(FEPs)
SDI card
Eth card
Serial
terminal
Serial
GigE
GigE
Raw socket
IP transport
7705 SAR can act as both client
and server simultaneously
Server (local host)
listens and opens
socket sessions for
clients (remote hosts)
Clients (remote hosts)
initiate socket sessions
toward servers
Substation
26177
Central location NOC
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