Indicator designating a circuit portion as the master leg/segment on a multipoint configuration.
NOTE 1: Designates the circuit portion coming into the LATA (from the ACTL) as the master leg/segment.
NOTE 2: Only one leg/segment on a multipoint circuit can be designated as the master, however, any number of other legs/segments can be designated as an alternate to the master.
NOTE 3: Leg/segments designated as an alternate master will be designed with the same functionality as the master leg/segment.
NOTE 4: All multipoint circuit configurations must contain a designated master leg/segment.
VALID ENTRIES:
M = This is the master leg/segment
A = This is an alternate to the master leg
R = Remove this as the master or alternate master leg/segment
NOTE 1: Valid entry of "M" is prohibited if the MST field on any MSL Form is "M".
USAGE: This field is conditional.
NOTE 1: Required for a multipoint circuit configuration when the ACT field on the ASR Form is "N" and this leg/segment is the master/alternate master.
NOTE 2: Prohibited when the UNE field on the ASR Form is populated.
NOTE 3: Otherwise optional.
DATA CHARACTERISTICS: 1 alpha character
EXAMPLE: M