Moxa CN2610-16 User Manual

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Terminal Servers

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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 keeps 
your applications running smoothly.

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.

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.

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.

Host

Data A

LAN A
LAN B

Data A

Data A

Serial

Data A

Data A

Host

LAN A
LAN B

Data A

Data A

Serial

Data A

Host 1

Data A

LAN A
LAN B

Data A

Host 2

Data A

Data A

Data A

Serial

Data A