Redundancy is an important issue for industry, and several different
solutions have been developed to prevent damage caused by equipment or
software failures. “Watchdog” hardware is required to utilize redundant
hardware, and a “Token” switching mechanism is required for software.
The CN2600 terminal server uses its built-in dual-LAN ports to
implement a “redundant COM” mode that keep your applications running
smoothly.
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 Model 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 will be available, even in the event of power circuit
failure.
