There are 15 independent Channels designated 1 through 15. 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 Ethernet Adapter acting as a Master within the same area to a different Domain and Channel. In networks with multiple Access Points, set each Access Point to a different Channel but the same Domain to facilitate roaming.

The Ethernet Adapter’s Channel may be set to a value between 0 and 15, and 0 is the default setting. When set to Channel 0, an Ethernet 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 Ethernet 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 the Channels are used. The Subchannels are designated 1 through 15, and 1 is the default setting. This parameter is visible only when the Ethernet Adapter is set as a Master.

For example, you can use Channel 1, Subchannel 1 for Network A and Channel 1, Subchannel 2 for Network B. The two net- works will not communicate with one another. They are, how- ever, still sharing the 1.6 Mbps data rate since they are both using Channel 1.

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Proxim 7920, 7921 manual