SDSL：Symmetric Digital Subscriber Loop，對稱數字用戶環路。關聯詞：DSL

SDV：Switched Digital Video，交換型數字視像。關聯詞：IDV

SIG：Special Interest Group，（藍牙）特殊興趣小組

SNI：Service Node Interface，業務節點接口。關聯詞：UNI

SWAP：Share Wireless Access Protocol，共享無線接入協議