CN2610 Series

Designed for Mission Critical Applications

In today's Internet world, many industrial applications face the challenge of integrating serial devices, such as RTUs, into a reliable Ethernet LAN. CN2610 Series answers this challenge with a special dual-LAN design that satisfies the requirements of even the most demanding redundant LANs.

The fact that each of CN2610's two LAN ports has a distinct MAC address, and the two ports can be configured with unique IP addresses, gives engineers a powerful weapon for preventing application shutdowns caused by network failures. In fact, the dual LAN design can be used to create a "super redundant" LAN/WAN network by establishing a redundant LAN, redundant host, as well as data acquisition redundancy. CN2610 can be used to access and manage any combination of serial devices—RTUs, servers, routers, workstations, LAN/WAN devices, and more. For added flexibility, CN2610's dual-host redundant solution can send and receive serial data to 4 IP addresses on the network.

The Dual host, dual LAN, dual CN2610  solution creates "super redundancy" to guard against system shutdowns

Most redundant systems provide different levels of redundancy to prevent "single piont failures." These redundant solutions not only require special hardware to create physical redundancy via some kind of "watch dog" switching mechansim, but also need special software for a "token" switching mechanism. CN2610 provides a Dual-host Redundant Data Acquistion Solution—abbreviated as DRDAS—that is suitable for highly redundant data acquisition requirements.

Dual-host Redundant Data Acquisition Solution (DRDAS)

With DRDAS, CN2610 can be used to create a super-redundant network solution, by providing LAN redundancy, host redundancy, and data acquisition redundancy.

LAN Redundancy
CN2610 has two LAN ports, each of which can be connected to a different LAN. By using routing tables, packets can be sent from the same CN2610 to both networks. This means that a network host with dual Ethernet cards can connect to the same CN2610 via two different IP addresses. If LAN A crashes or is not responding, the PC host is still able to communicate with CN2610 via LAN B.

Host Redundancy
CN2610 provides a synchronous communication capability, which means that it can establish network connections with a Primary PC and Backup PC at the same time. The system can be set up so that if the Primary PC stops responding, the backup PC will immediately take control.

Data Acquisition Redundancy
DRDAS mode takes advantage of the fact that one CN2610 can communicate with up to 4 IP addresses. In the previous picture, CN2610 receives data from the RTU via one of CN2610's serial ports, and then sends the data to 4 IP addresses over two different LANs. Two of the IP addresses are associated with the Primary PC, and the other two are associated with the Backup PC. One of the 4 IP addresses is the primary IP used to transmit data downstream to the RTU. During normal operation, the other 3 IP addresses are prevented from sending data to the RTU. With this kind of architecture, if the Primary PC, LAN B, and the Primary CN2610 crash at the same time, the one remaining data path will be used to keep the system operating.

CN2610 Dimensions

8-pin RJ45 Serial Port Pin Assignments

Pin RS-232 Signal 1       DSR (in) 2       RTS (out) 3       GND 4       RxD (out) 5       RxD (in) 6       DCD (in) 7       CTS (in) 8       DTR (out)

• Supports an LCM interface for easy on-site management
• Supports 2 IP addresses and 2 MAC addresses
• Dual-host Redundant Data Acquisition Solution (DRDAS)
• DRDAS provides two priority levels with 1 Primary and 3 Secondary connections
• Real COM/TTY driver for Windows and Linux
• Console Management for routers, PBX units, and servers
• ASPP or Standard BSD for Socket Programming
• Remote management via Telnet, SNMP II