18.12. LWNC - Line protocol without node number 
Feature:
Display modification
Prevention of network loops and illegal connections
Function:
Systems that do not understand node numbers should always be assigned COT parameter
LWNC in the trunks leading to them.
On the outgoing route, the parameter always prevents the transfer of node numbers
to the
remote system. And in the incoming direction, the LWNC parameter only works if the
DFNN parameter is not set.
If no node number can be derived from an incoming calling number (for which the associated
source node number is missing) then, when LWCN is set, the source node number is taken
to be
the node number of the trunk or, when LWCN is not set, the source node number is taken
to be
the user's own node number set up with ZAND for display modification or for the prevention
of network loops and illegal connections.
AMO Interrelationships:
IMPORTANT:
If the LWNC and DFNN parameters
are set at the same time, then DFNN deactivates the function of
LWNC in the incoming direction, but not in the outgoing direction.
COT= SATC Satellite counter administration, COT=ATRS Transit counter
administration, TDCSU, TACSU, ZAND
Device types:
Analog and networking trunks
Protocol variants:
Analog and digital protocols