Clear-Com LMC-64 - Manual (Page 24)

Clear-Com
Eclipse Median Instruction Manual
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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.
Ethernet redundancy and the use of a default gateway is not
recommended. 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.
FAIL-SAFE OPERATION
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,
after replacement of a port card, or after replacement of a panel.
An Eclipse Median system will operate 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.
OPERATING THE CPU CARD
The following sections describe the CPU card’s status lights and
controls, which are illustrated in Figure 2-2.
RESET BUTTON
Pressing the reset button causes the CPU card to stop its current
activity and to restart. The same configuration that was active before
the system was reset will be active after the system was reset.
During the reset, configuration information reloads to the card’s
operational memory from its non-volatile memory and the card starts
running again from the beginning.
Note: The reset button is slightly recessed from the front panel to
prevent it from being accidentally pressed. A tool such as a
bent paper clip is needed to press this button.
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