G.992 whichis one of ADSL standard (G.dmt/G.Lite), among the incidental standards which add the stipulation which considers the communication circumstance of each area of the world, for indian ones. In addition, for North American AnnexA and forEuropean AnnexB are prepared.

The ISDN circuit of the TCM- ISDN system whichis adopted inUSsame periodit does, it prevents the speed decrease with interference by changing transmission speed according to the size of interference.

The NTT regional company (ADSL) and, as for domestic enterprise such as eAccess large portion has adopted Annex C. But there is also an enterprise which because as for Annex C because of the indian private standard cost is high, actualizes cost reduction even in the indian countrydoesservice with Annex A of the North American specification.