This in turn led to acceptance and deployment of the Optilink NGDLC by all 7 RBOCs plus the large independent GTE .
The Optilink architecture that combined Telcordia GR - 303 and the ANSI standard SONET then became the de facto definition of the NGDLC .
This in turn led to acceptance and deployment of the NGDLC   by all 7 RBOCs plus the large independent GTE .
The Optilink architecture that combined Telcordia GR - 303 and the ANSI standard SONET then became the de facto definition of the NGDLC .