It will determine the speed, reliability and relative security of the transmission.

There are two types of security to consider when using a fax:

1) the security of documents out in public - ensuring that docuements received are properly delt with, and kept from people that shouldn't see them

2) the security of the transmission of the documents - ensuring that the transmission is secure. In most cases, there is no way to "encrypt" a fax transmission, however there are laws in place regarding wiretapping of phone lines.

By using a random series of frequencies.

Where computer security deals with the processes applied to computer system(s), information security concerns all of the aspects regarding the system of policies and/or procedures for identifying, controlling, and protecting information from unauthorized disclosure. While often synonymous, information security is actually a superset of computer security, encompassing the fields of data security, transmission security, network security, physical security, personal security, and personnel security,

They find use in Clock demultiplexer,Security monitoring system,Synchronous data transmission system