1  –  PHYSICAL ADDRESS address

 Applies only to broadcast circuits.  Identifies the physical
 address of the node that will perform the role of loopback
 assistant for third-party loop testing.  This parameter must be
 specified if HELP is included in this command. The address cannot
 be a multicast address.  This parameter can be used instead of
 the ASSISTANT NODE parameter.

2  –  NODE node-id

 Applies only to broadcast circuits.  Identifies the name of the
 node or the address of the node that will perform the role of
 loopback assistant for broadcast third-party loop testing.  This
 parameter can be used instead of the ASSISTANT PHYSICAL ADDRESS
 parameter.