This field is used to specify an address for the node.  If there are
 no more addresses to define, leave this field blank.

 The address can be either an NSAP value or a Phase IV address value.  If a
 Phase IV address is specified, an NSAP is constructed using the specified
 address and the Phase IV prefix value.  The N-Sel value is assumed to be
 "20" (for NSP).

 Some examples of addresses are:

   1.5           - A Phase IV address (using the default Phase IV prefix)
   1.5+39:840    - A Phase IV address (using an explicit Phase IV prefix)

   39:840:01:AA0004000504:20   - An NSAP with an N-Sel indicating NSP
   39:840:01:AA0004000504:21   - An NSAP with an N-Sel indicating TP4

 See the MAIN_MENU NSAP_ADDRESSES and PHASE_IV_ADDRESSES topics for
 details about entering addresses.