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the system must operate with branch tower hardware, while the clients can buy computer by themselves. Notice: the host tower must be drivered by the CMS, there is no need for module. but we need to intall a system driver to make the branch tower work. Howerver, there are some exceptions. if the branch tower just works as a repeater, no TTS voice instruction, no alarm function, we need no submodule, the whole work was handle by the host tower. In order to save money, some prison adopt the solution. But in some situations, In order to ensure safety we can´t adopt the solution metioned before. For example, if the branch tower installed in the farm is very far from the prison, so that the people can not receive the instruction form the host branch, so the submodules are needed. At that time, the prison police can action at the first time.
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