サービスデータ単位 でしょう
sābisudētatan'ideshō
1. Probably service data unit.
Noun
1. Probably service data unit.
1. data; datum
1. coup d'état; coup
1. service industry; service sector
1. service area; toll road rest stop
1. self-service
2. self-
1. self-service
1. data communication
1. pickup service