signalling access protocol如何翻译?通信业的词汇,是信令“什么”协议?入口协议吗?

signalling access protocol如何翻译?通信业的词汇,是信令“什么”协议?入口协议吗? signalling information access. access PR PR pr. signaling和signalling有什么区别能否稍详细些 have access access to access造句 access your get access wireless access user access Hide Access access point pr是什么意思