ISO 9000 History

ISO 9000 is an important marketing tool and is recognized world wide. Maintained by the ISO (international standards organization), it is a family of ISO standards for quality management systems. ISO 9000 grew out of British standards institution's BS 5750. The ISO 9000 series are managed by several accreditation and certification bodies. Though the standard was first applied to manufacturing industries, it is now employed across a variety of other types of businesses.

Studies show that the history of industrialization has seen lots of standards on quality issues. For instance, during the two world wars, a high percentage of bullets and bombs went off in the factories themselves in the course of manufacturing. In an effort to curb such causalities, UK?s ministry of defense appointed inspectors in the factories to supervise the production process.

In 1959, the United States introduced Mil-Q-9858a, the first quality standard for military procurement. By 1962, NASA developed its quality system requirements for suppliers. Six years later, NATO accepted the AQAP (allied quality assurance procedures) specifications for the procurement of equipments. In 1969, UK and Canada introduced suppliers? quality assurance standards.

During the 1970s, British standards institution (BSI) published BS 9000 (the first UK standard for quality assurance) and BS 5179 (guidelines for quality assurance) norms. During the period, the BSI held meetings with industry to set a common standard. Consequently, in 1979, the institution developed BS 5750, a series of standards for use by manufacturing companies. They were enforced through assessments and audits.

In 1987, the BSI revised the standard to take in service providers and manufacturing industries also. In 1988, ISO adopted the BS 5750 standard without changes and published it globally under the name, ISO 9000.

In 1994, ISO revised the standard. In December 2000, the standard was again reorganized. The new ISO 9000 standard has many resemblances to its predecessors.

ISO 9000 provides detailed information on ISO 9000, ISO 9000 Standards, ISO 9000 Software, ISO 9000 Consulting and more. ISO 9000 is affiliated with Home Inspections

An Brief Explanation on ISO 9001:2000 Quality Procedure

When our company intend to implement Quality Management System (ISO 9001:2000), we should prepare quality management system documentation that includes documented statement of quality policy and quality objectives, a quality manual, quality procedures and workplace references or work instructions to ensure the effective planning, operation, and control of company processes.

In regard with quality procedure, it should be established, documented, implemented and maintained. The documented ISO 9001:2000 procedure may be different from one company to another because of the size of company and type of activities, the complexity of processes and their interactions and the competence of their personnel.

In practice, format of ISO 9001:2000 quality procedures may also differ from one company to another. For a company that is trying to make their own ISO 9001: 2000 quality procedures for the first time, using ISO 9001:2000 procedure examples can be very helpful. It does not mean duplicating the ISO 9001:2000 procedure example for the company own use.

An ISO 9001:2000 quality procedure may consist of cover sheet, flow diagram, and procedure in detail. The cover sheet contains Company name, title of ISO 9001:2000 procedure, sheet number, document number and revision record (revision number, description of revision, date of revision and signature of the person in charge.

The flow diagram explains step by step from the beginning how the ISO 9001:2000 procedure flows. And the procedure its self should at least have an objective, scope, general explanation, definitions used in the procedure, content of the procedure, records used, related documents and important attachments. The contents of ISO 9001:2000 procedure is a text description of the work flow or instructions based on its flow diagram. The description is started with the persons in charge and followed by explanation of their tasks or jobs as specified in the flow diagram.

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Seven Layers of ISO OSI Model

The ISO OSI model are explained below. The seven layers of the OSI model are:
 

• Application
• Presentation
• Session
• Transport
• Network
• Antiqua">Data Link
• Physical

 

1 Application layer:
This layer provides a means for the user to access information on the network through an application. Many user applications that need to communicate over the network interact with the Application layer protocol directly. The user applications are not part of OSI Application layer, use the networking services offered by the networking protocol suite. Application layer functions typically include identifying communication partners, and determining availability of required resources. Some examples of application layer implementations include Telnet, File Transfer Protocol (FTP), and Simple Mail Transfer Protocol (SMTP).
 

2 Presentation layer:
Presentation layer converts local host computer data representations into a standard network format for transmission on the network. On the receiving side, it changes the network format into the appropriate host computer's format so that data can be utilized independent of the host computer. ASCII and EBCDIC conversions, cryptography, and the like are handled here. Examples of Presentation layer coding and conversion schemes include common data representation formats, conversion of character representation formats, common data compression schemes, and common data encryption schemes.
 

Presentation layer implementations are not typically associated with a particular protocol stack. Some well-known standards for video include QuickTime and Motion Picture Experts Group (MPEG). QuickTime is an Apple Computer specification for video and audio, and MPEG is a standard for video compression and coding.

3. Session layer:
The session layer establishes, manages, and terminates communication sessions. Communication sessions consist of service requests and service responses that occur between applications located in different network devices. These requests and responses are coordinated by protocols implemented at the session layer. Some examples of session-layer implementations include AppleTalk's Zone Information Protocol (ZIP), and Decent Phase Session Control Protocol (SCP).
 

4.Transport layer:
Transport layer is responsible for providing reliable service between the hosts. Upper layer datagrams are broken down into manageable datagrams and then appropriate header information (such as sequence number, port number, etc.) is added to the datagram before passing it on to the Network layer. Two frequently used transport protocols are the TCP (Transmission Control Protocol) and the UDP (User Datagram Protocol).
 

Important features of Transport layer:

 

• Transport layer ensures reliable service.
• Breaks the message (from sessions layer) into smaller datagrams, and appends appropriate unit header information.
• Responsible for communicating with the Session layer

 

Important features of TCP/UDP:

 

• TCP/IP widely used protocol for Transport/Network layers
• TCP: (Transport Control Protocol) TCP ensures that a packet has reached its intended destination by using an acknowledgement. If not, it retransmits the lost messages. Hence, TCP is called a connection oriented protocol.
• UDP (Universal Data gram Protocol): UDP simply transmits packets over the internet. It does not wait for an acknowledgement. It is the responsibility of upper layer protocols to ensure that the information had reached the intended partner(s). Hence, UDP is often called connectionless protocol.
• Application programs that do not need connection-oriented protocol generally use UDP.

 

5. Network layer:
Network layer is responsible for the routing of packets through the entire network. The layer uses logical addressing for this purpose. Note that the physical address (like MAC address) keeps changing from hop to hop when a packet travels from source to destination. As a result, an address that doesn't change is required to ensure continuity between hops. This is nothing but logical address. For IP networks, IP address is the logical address; and for Novell network, IPX address is the logical address, and so on. This layer also provides for congestion control, and accounting information for the network. IP (Internet Protocol) is an example of a network layer protocol.
 

6. Data link layer:
Data link layer provides delivery of information frames between communicating partners. This layer is responsible for flow regulation, error detection and correction, and framing of bits for transmission. The network data frame is made up of checksum, source address, destination address, and the data itself. The largest frame size that can be sent is known as the maximum transmission Unit (MTU).

Important features of Data link layer:
 

 

• Assembles bits into frames, making them ready for transmission over the network.

   

   

• Provides error detection, and correction to transmitted frames. If the checksum is not correct, it asks for retransmission. (Send a control message).

   

   

• Consists of two sub layers:

   

   

  1. Logical Link Control (LLC): Defines how data is transferred over the cable and provides data link service to the higher layers.

      

      

  2. Medium Access Control (MAC): Controls media access by regulating the communicating nodes using pre-defined set of rules. (i.e. Token passing, Ethernet [CSMA/CD] all have MAC sub-layer protocol).

Different Data link layer protocols define different network and protocol characteristics, including physical addressing, network topology, error notification, sequencing of frames, and flow control. Physical addressing (as opposed to logical addressing) defines how devices are addressed at the data link layer. The protocols used in Data link layer are SLIP, PPP, and CSLP.
 

 

7. Physical layer:
This is the bottom-most layer of the OSI model. The Physical layer handles the bit-level communications across the physical medium. The physical medium could be made up of wired electrical signals, or light, or radio (wireless) signals. Physical layer specifications define characteristics such as media, data rates, maximum transmission distances, and physical connectors.
Some of the important standards that deal with physical layer specifications are:
RS-232(for serial communication lines), X.21, EIA 232, and G730.
Physical layer and Data link layer implementations can be categorized as either LAN or WAN specifications.

Vijayanand has done his post graduation (M.E.) in Communication Systems. He has several years of experience in electronic assembly and design, rf testing, and networking. He is a Cisco Certified Networking Professional, and an MCSE (Microsoft Certified Systems Engineer). He is a director of Anand Software and Training Pvt. Ltd. Complete tutorial on Networking is available at SimulationExams.com

How International Organization for Standardization Helps

The International Organization for Standardization, or ISO, is a non-governmental organization that develops technical standards, contributing to making the development, manufacturing, and supply of both supplies and services, cleaner and safer. Providing government with standards regarding health and safety issues, they also promote fair trade between counties. We tend to take many things for granted; we always expect simple objects, like screws, to do the job that we intend them for. ISO ensures just that, and sets standards that make things better for all of our society, as a whole.

With a Central Secretariat in Geneva, Switzerland, ISO is a network of standard institutes in 146 different countries. Dating back to 1947, ISO was created by 25 delegates who determined that a new international organization was needed "to facilitate the international coordination and unification of industrial standards". Due to the fact that “International Organization for Standardization” would have different initials in different languages, it was decided to use a word derived from the Greek word “isos”. For this reason, no matter what country you are in, the short form of the organization is always ISO, which means “equal”.

To date, ISO has created nearly 14,000 international standards, covering things like agriculture, mechanical engineering, construction, medical devices and information technology developments. While the majority of ISO standards are geared towards certain products, ISO 900 and 14000 deal with quality and environmental management, and are considered "generic management system standards”. By ’generic,’ this means that they are a list of standards which all products and workplaces must meet, regardless of whether they produce a product or service, and regardless of where they are located. By maintaining customer regulations, as well as doing what they can minimize harmful effects on the environment, ISO standards help ensure that our world is a much better place.

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