This document introduces the architecture and features of the seventh number common signal system (SS7), as well as the interface between PSTN and PCS network (PCN) using SS7.
This document introduces the Signaling System No.7 (SS7) protocol, describing its basic elements, classification, and role in modern telecommunication networks. It explains the components, links, and interconnection between public switched telephone networks (PSTN) and packet-switched networks (PCN).
The manual also details call control procedures using ISUP, covering both land‑to‑mobile and mobile‑to‑land call setup and release processes, and summarizes the key features of SS7 as an out‑of‑band signaling method. This manual is written in Chinese.
The three components are STP, SSP, and SCP.
SS7 defines six links, labeled A through F.