Clear-Com HX System Frames - Manual (Page 56)

5.3.1 Configuration restrictions for Ethernet ports
The network ID on the first Ethernet port must be different to that of the second port.
The network ID is defined by the IP address and the network mask for the port. For example
a network address of
172.16.2.1 and a mask of 255.255.0.0 gives a network ID of
172.16 . Therefore in this scheme the second port could not have an IP address, starting
with 172.16.
If the network mask is extended to 255.255.255.0 the network ID becomes 172.16.2
so the second port could have an address of 172.16.3.1 and a mask of
255.255.255.0 giving a network ID of 172.16.3 for the second port.
If both Ethernet ports are set up with the same network ID this condition results in data loss
on one or both of the Ethernet ports.
Note:
Ethernet redundancy and the use of a default gateway is not supported. An IP address and
gateway combination on an Ethernet port means that all Tx traffic to any address is possible
on the port. Traffic that actually matches the other Ethernet port can therefore be sent out on
the wrong port.
5.4 CPU card fail-safes
The CPU card’s non-volatile memory stores all information about the current operating
configuration and the three additional configurations, allowing the system to restore itself
automatically after:
• A power failure.
• The replacement of a port card.
• The replacement of a panel.
An Eclipse HX-Median system operates with either one or two CPU cards.
When a second card is installed, that card stores the four configurations in its RAM as a
backup to the main card. If the main card is removed or becomes non-operational for any
reason, the system will automatically switch to the second card as backup.
56 Eclipse HX-Median User Guide