对公共信道信令系统中的综合业务数字网用户部分（ISUP）和电话用户部分（TUP）进行了简单的比较。
The simple comparison is made between Integrated Server Digital Network User Part (ISUP) and Telephone User Part (TUP) in this paper.
我国目前的电话网是数模混合的，所以我国目前的信令系统也处于随路信令和公共信道信令并存的阶段。
Our country present telephone network is mixed by digital mode and analogy mode, so our country present signaling system is at the stage of CAS and CCS commixture .
在RAN通过广播信道发给MS的信息中只有系统信息而没有别的信令。
There is no signalling between RAN and the MS except for system information that is sent from RAN on a broadcast channel to the MS.
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