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RuggedWireless™ RS920W
RuggedWireless
TM
RS920W
Wireless Serial Device Server with Ethernet over VDSL Interface
ROS
TM
Features
Serial IP Encapsulation
Many 'legacy' devices (RTU, PLC, IED, etc.) only support
serial communications via RS232, RS422 or RS485. ROS™
encapsulates the serial data within a TCP connection allowing
these devices to be reached via an IP network. A wide range
of baud rates, frame packetization options, and diagnostics
allows any serial protocol to function. The RS416 has specific
support for the following serial protocols:
Raw Socket serial encapsulation
Modbus TCP (client and server)
DNP 3
WIN and TIN
Microlok
MODBUS TCP
The Modbus protocol is ubiquitous in the industrial control
and automation world. ROS converts Modbus RTU
master/slave serial data packets to Modbus TCP client/server
packets for transmission over an IP network. This allows
communications to Modbus RTU slaves via Ethernet and
allows multiple masters to poll the same slave device.
Cyber Security
Cyber security is an urgent issue in many industries where
advanced automation and communications networks play
a crucial role in mission critical applications and where high
reliability is of paramount importance. Key ROS™ features that
address security issues at the local area network level include:
Passwords - Multi-level user passwords secures switch
against unauthorized configuration
SSH / SSL - Extends capability of password protection to
add encryption of passwords and data as they cross
the network
Enable / Disable Ports - Capability to disable ports so that
traffic can not pass
802.1q VLAN - Provides the ability to logically segregate
traffic between predefined ports on switches
MAC Based Port Security - The ability to secure ports on
a switch so only specific Devices / MAC addresses can
communicate via that port
802.1x Port Based Network Access Control - The ability
to lock down ports on a switch so that only authorized
clients can communicate via this port
Radius - Provides centralized password management
SNMPv3 - encrypted authentication and access security
The ROS™ cyber security features are included to help
address the various industry specific security standards such
as NERC CIP, ISA S99, AGA 12, IEC 62443, ISO 17799:2005
and PCSRF SPP-ICS.
Enhanced Rapid Spanning Tree Protocol (eRSTP™)
RuggedCom eRSTP allows the creation of fault-tolerant ring
and mesh Ethernet networks that incorporate redundant links
that are 'pruned' to prevent loops. eRSTP yields worst-case
fault recovery1 of 5ms times the 'bridge diameter' and allows
rings of up to 80 switches. For example, a ring of ten switches
will have fault recovery times under 50ms. eRSTP implements
both STP and RSTP to ensure interoperability with commercial
switches unlike other proprietary 'ring' solutions.
Quality of Service (IEEE 802.1p)
Some networking applications such as real-time control
or VoIP (voice over IP) require predictable arrival times for
Ethernet frames. Switches can introduce latency in times
of heavy network traffic due to the internal queues that buffer
frames and then transmit on a first come first serve basis.
ROS™ supports 'Class of Service' in accordance with IEEE
802.1p that allows time critical traffic to jump ahead to the
front of the queue thus minimizing latency and reducing jitter
to allow such demanding applications to operate correctly.
ROS™ allows priority classification by port, tags, MAC
address, and IP type of service (TOS).
A configurable "weighted fair queuing" algorithm controls how
frames are emptied from the queues.
VLAN (IEEE 802.1q)
Virtual local area networks (VLAN) allow the segregation
of a physical network into separate logical networks with
independent broadcast domains. A measure of security is
provided since hosts can only access other hosts on the
same VLAN and traffic storms are isolated. ROS™ supports
802.1q tagged Ethernet frames and VLAN trunks. Port
based classification allows legacy devices to be assigned
to the correct VLAN. GVRP support is also provided to
simplify the configuration of the switches on the VLAN.
Link Aggregation (802.3ad)
The link aggregation feature provides the ability to aggregate
several Ethernet ports into one logical link (port trunk) with
higher bandwidth. This provides an inexpensive way to set up
a high speed backbone to improve network bandwidth. This
feature is also known as "port trunking", "port bundling", "port
teaming", and "ethernet trunk".
IGMP Snooping
ROS uses IGMP snooping (Internet Group Management
Protocol v1&v2) to intelligently forward or filter multicast traffic
streams (e.g. MPEG video) to or from hosts on the network.
This reduces the load on network trunks and prevents
packets from being received on hosts that are not involved.
ROS™ has a very powerful implementation of
IGMP snooping that:
1 eRSTP fault recovery times may be approximated as follows:
For 100 Mbps, fault recovery performance is <5ms/hop
For 1,000 Mbps, fault recovery performance is <5ms/hop + 20ms