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Redundancy is an important requirement for many industrial applications, and different solutions have been developed to keep systems running during equipment or software failure. Special "watchdog" hardware is required to implement hardware redundancy, and a "token" switching mechanism is required at the software level. Dual LAN redundancy involves two separate physical networks that connect a PC host to the terminal server. On the CN2600, the two networks are connected using two built-in LAN ports. On the PC host, two LAN cards are required. When dual LAN redundancy is implemented, the PC host will have continuous access to serial devices attached to the CN2600, even if one of the networks fails.

Dual-LAN Redundancy
The CN2600 has two separate LAN ports that can be connected to separate LAN networks. Dual-LAN redundancy involves setting up two separate physical networks to connect the PC host with the CN2600. In this case, the PC host must also be installed with two LAN cards. If one of the networks fails, the PC host will still be able to communicate with your serial devices over the redundant LAN.

Redundant COM
The"Redundant COM" (patent pending) operation mode can be used to set up a redundant LAN between the CN2600's COM ports and the host computer. The redundant structure involves using the CN2600's two LAN ports to set up two independent LANs that connect the CN2600 to the host computer. If either of the two LANs fails, the other LAN will continue transmitting packets between the serial devices and the host, with the data transmitted through the CN2600. One of the biggest advantages of using Moxa's Redundant COM mode is that the "switching time" is zero. What this means is that if one of the LANs fails, data transmission between the PC host the serial devices will not be interrupted.

Dual-host Redundancy
The CN2600's dual LAN cards can also be used to set up "dual-host" redundancy. In this case, both networks (LAN A and LAN B in the figure) are connected to two different hosts. If either of the two hosts shuts down unexpectedly, the other host will continue transmitting packets to (and receiving packets from) the serial devices connected to the CN2600.

Dual-AC Models Supported
Dual-power redundancy uses two power inputs and redundant internal power supplies to ensure that the CN2600's console port, serial ports, and LAN ports are available, even in the event of power circuit failure.

Features

• LCD panel for easy IP address configuration
• Dual-LAN cards with two independent MAC addresses and IP addresses
• Redundant COM function available when both LANs are active
• Dual-host redundancy can be used to add a backup PC to your system
• Dual AC power inputs
• Real COM/TTY drivers for Windows and Linux