Proxima ASA 7911 - Manual (Page 46)

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For example, you can use Channel 1, Subchannel 1 for Adapter
Pair A and Channel 1, Subchannel 2 for Adapter Pair B. The
two pairs will not communicate with one another. However,
they are still sharing the 1.6 Mbps pipe since they are both using
Channel 1.
The Subchannels are designated 1 through 15, and 1 is the
default setting. This parameter is visible only when the Serial
Adapter is set as a Master.
The optional Master Name parameter of up to 11 characters
specifies an alphanumeric name to simplify the identification of
each Master in your wireless topology. This parameter is visible
only when the Serial Adapter is set as a Master.
To further improve the security of a wireless topology, each unit
requires the same Security ID to establish communication. The
Security ID may be set on both Masters and Stations. This ID is
encrypted and stored within the RangeLAN2 Serial Adapter
itself, not in software. It cannot be accessed, but you may
change it. However, if you do change it, then you will need to
change the Security ID on all of the other radios to the same new
value to reestablish communication.
The Security ID parameter can be up to 20 characters and is an
empty string by default. There are 1,048,576 unique choices for
the Security ID.
Note:
The Security ID value is not a software parameter but is
stored within the Serial Adapter’s radio. Therefore, if
you choose the Reset Parameters to Factory Defaults
option from within the Serial Adapter Main Menu, the
Security ID will not be reset to its default value.