Proxima ASA 7911 - Manual (Page 45)

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Each Master can select one of 15 Channels to establish commu-
nication with its Stations. Each Channel number sets a unique
frequency hopping sequence allowing for multiple subnetworks
with higher data rate transmission capability in the same air
space.
You may think of the Channel as a pipe. In order to communi-
cate, radios must be on the same Channel and there must be one
(and only one) Master that provides the timing for that Channel.
There are 15 independent Channels available for use with
RangeLAN2 products. This means that there are 15 different
sequences of frequency hops. Each Channel is at a different
frequency at a different time. To minimize interference, set each
Serial Adapter acting as a Master within the same vicinity to a
different Domain and Channel.
The Serial Adapter’s Channel may be set to a value between 0
and 15, and 0 is the default setting. When set to Channel 0, a
Serial Adapter automatically selects a Channel upon boot-up
based on the configured Domain number. The Channel selected
is the Domain number plus 1. Therefore, if the Domain is set to
0, the Channel is 1. Note that the automatic selection procedure
will choose Channel 15 when set to either Domain 14 or 15.
This parameter is visible only when the Serial Adapter is set as a
Master. All Stations will determine their Channel by the Master
to which they are synchronized.
The Subchannel is a software code that is appended to each
radio packet. It does not affect the frequency hopping sequence
like a Channel does. Use a Subchannel if you need more than 15
Masters in the same area and, therefore, all of the Channels are
in use.