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STANDARD IEEE 802.4 (TOKEN BUS)
The standard bus token defines network schemes of large bandwidths. It is derived from the MAP protocol. The network implements tokken-passing methods for a transition.

POLICY AND SECURITY GUIDELINES IN THE CENTER OF CÓMPUTO.
A Computer Center represents a very important nucleus within an organization, and its main objective is to satisfy the information needs of a company in a truthful, timely and timely manner.

Main rules of computer security:
Privacy.- The information must be seen and manipulated mainly by those who have the right or authority to do so.
Integrity.- The information must be consistent, reliable and not prone to unwanted alterations.
Availability.- The information must be at the moment the user requires it.

TOTAL SECURITY IN COMPUTING.
A broad approach that covers a number of interrelated aspects is required in a methodical manner. There are two major areas that should be incorporated into such an approach:
Administrative aspects
Technical aspects.

ADMINISTRATIVE ASPECTS
Security policies in a computer center.
Physical and fire safety
Organization and division of responsibilities
.RULES
FOR ALL USERS THE USERS ARE STRICTLY PROHIBITED THE FOLLOWING
* Introduce food and / or drinks.
* Smoking inside the service area.
* Use recorders, radios or sound equipment without headphones.
* Move, disconnect and / or connect computer equipment without authorization.
* Modify the configuration of the equipment or try it.
* Alter software installed on computers.
* Alter or damage the identification labels of the computer equipment.
* Create directories and copy files to hard disk.
* Use computer equipment as gaming machines; This includes using game software or accessing services that involve the use of non-academic interactive games.
* Use the team to develop programs or projects outside the academic interest of the faculty.
* Extract manuals and / or books.
* Extract consumables from computer equipment.
* Copy software whose license for use prohibits it.
* Send messages to other users anonymously.
* Abuse and / or misuse of the equipment.
* Access pages with content not suitable for the public morality of the users of the computer center. Example: Consult all types of pages, literature and / or emails PORNOGRAFICOS.
* Access CHAT programs or install them in the machines.
* Any aggressive attitude or bad manners.

THE FOLLOWING RECOMMENDATIONS CAN PROLONG THE LIFE OF THE EQUIPMENT:
· Locate the equipment in a place where there is not much movement of personnel.
· Do not move the computer without the authorization of the Center's Advisor? Calculation.
· Install the computer on desks or furniture that are stable or specially designed for it.
· Locate the equipment away from sunlight and open windows.
· Electric power must be regulated at 110 volts and with ground pole. Advise yourself properly to ensure a good electrical outlet.
· The equipment away from sunlight and open windows.
· Electric power must be regulated at 110 volts and with ground pole. Advise yourself properly to ensure a good electrical outlet.
· Do not connect other devices (radios, typewriters, calculators, etc.) to locate the equipment in a place where there is not much movement of personnel.
· Do not move the computer without the authorization of the Computer Center advisor.
· Install the computer on desks or furniture that are stable or specially designed for it.
· Locate the same outlet on the computer.
· Each user, when finishing daily tasks, must turn off the equipment (Computer, Printers, Scanner).
· Avoid placing hooks, clips, beverages and foods that may fall accidentally inside the equipment on or near the computer.
· Do not smoke near the equipment, the tar adheres to the internal parts and circuits of the equipment.
· Keep the external parts of the computer and printers free of dust. Use a soft, dry cloth. Never use soap and water.
· Keep the screen and keyboard covered with covers when you do not use them for a considerable time or if you plan to clean or repair the computer.
· Use the correct paper width in the printer. The direct contact of the print head on the roller can damage both parts. (Users with dot matrix printers)
· Do not connect other devices (radios, typewriters, calculators, etc.) in the same socket on the computer.
· Each user, when finishing daily tasks, must turn off the equipment (Computer, Printers, Scanner).
. Avoid placing hooks, clips, beverages and foods that may fall accidentally inside the equipment on or near the computer.
· Do not smoke near the equipment, the tar adheres to the internal parts and circuits of the equipment.
· Keep the external parts of the computer and printers free of dust. Use a soft, dry cloth. Never use soap and water.
· Keep the screen and keyboard covered with covers when you do not use them for a considerable time or if you plan to clean or repair the computer.
· Use the correct paper width in the printer. The direct contact of the print head on the roller can damage both parts. (Users with dot matrix printers)
· It is forbidden to uncover and try to fix the equipment on your own. In all cases the advisor of the Computer Center is in charge of this operation.
· Do not lend equipment or make sure that the person who uses it knows its correct operation.