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七号共路信令系统(简称 CCSS No.7)是适于64kb/s PCM 数字环境的新型信令系统,具有信令传递速度快、流量大、种类多等特点.因采用不等长信号单元传递信令消息,所以在全通信网上的灵活性和信令链的高效利用是任何一种随路信令系统都无法比拟的.整个信令系统由四个功能级组成.第二功能级较简单,而第二功能级既是第三、四功能级的基础,又
The No. 7 Common Channel Signaling System (CCSS No.7) is a new type of signaling system suitable for the 64kb / s PCM digital environment. It has the characteristics of fast signaling transmission, large traffic and many kinds of signals, etc. Due to the unequal length signal Unit transfer signaling messages, so the flexibility in the whole communication network and the efficient use of the signaling chain is unmatched by any kind of associated signaling system. The entire signaling system consists of four functional levels. The second functional level Simpler, while the second functional level is the basis of the third and fourth functional levels, again