SAC:Soft-switch service Access Control device,软交换业务接入控制设备
SECBR:Severely Errored Cell Block Ratio,严重误信元块率
SG:Signal Gateway,信令网关。关联词:AG、TG
SHLR:Smart Home Location Register,智能归属位置寄存器
SIP:Session Initiation Protocol,会话启动协议
SS:Soft Switch,软交换
SVC:Switch Virtual Connection,交换虚连接。关联词:PVC