This paper studies some aspects about the PSTN safety, presents a PSTN fire wall model named TFW which supports the digital encryption for telephone keyboard, and analyzes key technologies to implement the model.

The height of the fireproof wall should be increased and painted steel screen should be added on the exterior wall to prevent fillets in the wall from flying off in the case of an explosion.

And it also analyses the installment schemes of various fireproof walls and attempts to ensure the balance between the cost and efficiency under specific conditions so as to enable the system to operate in a safe, stable and effective way.

In this paper,the author,by drawing up the hardware conditions and software conditions,gives some specific proposals in dealing the management of campus network function,net security and fireproof wall,etc.

Formwork construction technique of fair-faced concrete fire wall;

Basic Analysis of the Fire Wall and Safe Technique in Network;

The design of intelligent firewall based on machine learning;

Allocation and implementation on iptables and Linux firewall;

The application of firewall to defending LAN against being attacked;

During Huaxin station fire-wall construction in Sanhu power transmission and distribution project, to control construction technology, certain measures have been adopted in exterior concrete construction to reach as-cast finish standard.