Proxima ASA 7911 - Manual (Page 26)

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Figure 7
Rotary Switches
The Pairing Domain
There is an additional feature associated with Domain 8 on the
Domain Switch called the Pairing Domain. When the Pairing
Domain is not used, two Serial Adapters will each send out a
series of handshaking messages and exchange IP addresses to
enable communication during boot-up. This information is lost
each time the Serial Adapter is powered off; therefore, the Serial
Adapter performs this handshaking procedure each time the unit
is reset.
However, the Pairing Domain feature stores the communication
information permanently within the unit so that it is not lost
Domain Switch Station/Master Switch