Technology Used by Metropolitan Area Network
Asynchronous Transfer Mode (ATM)
An international standard for cell relays where multiple types of service (such as digital voice / video, or data) are delivered in fixed length (53-byte) cells. Fixed-length cells allow cell processes to take place in hardware, thereby reducing ATM delays designed for high-speed media transmissions such as E3, SONET, and T3. ATM differs in a number of ways from other more common data link technologies such as Ethernet.
Fiber Distributed Data Interface (FDDI)
Is a protocol that uses a double optical fiber loop topology called the primary circle and secondary circle. Both of these circles can be used for data transmission but only the primary circle is usually used as the main network. The secondary circle only works if the primary circle is damaged.
Switched Multi-megabit Data Service (SMDS)
Is a connectionless service used to connect LANs, MANs and WANs for data exchange. In the early 1990s, in Europe this service was known as Broadband Connectionless Broadband Data Service (CBDS). The purpose of connectionless is that there is no need to manage connections over the network before sending data.
Characteristics of MAN
Covers an area of between 5 and 50 km range. Many MANs cover urban areas.
A MAN (like WAN) is generally not owned by one organization. MAN, its communication links and equipment, are generally owned by either a consortium of users or by a network service provider that sells services to users.
MAN often acts as a high-speed network to allow sharing of regional resources. It is also often used to provide shared connections to other networks by using links to WANs.
MAN is larger and usually uses the same technology as a LAN.
It only has one or two cables and has no switching element, which functions to manage packets through several cable outputs. The existence of switching elements makes the design simpler.
Metropolitan Area Network (MAN) Example
Metropolitan Area Network (MAN) Network Center for Geological Survey (Model Concept and How to Use It for Users)
Computer technology (informatics) that has developed rapidly along with the development of telecommunications technology has created an electronic revolution that can distribute news or data at the speed of light to all corners of the world. The information revolution, which is a combination of science and technology, has changed the source of wealth, not material anymore, as in the era of industrial evolution, but in the form of information, this value has given rise to the slogan that "Whoever controls information will rule the world".
Apart from that, now many companies / agencies have realized the need to follow / take advantage of these technological developments, this can be seen from the many instances / companies that have used a computer network system (network) in the management and communication of data, one of them is the Geological Survey Center (PSG) agency.
The Geological Survey Center which has 3 (three) building complexes which are far apart, namely the Diponegoro complex as the central building complex, then the Quaternary laboratory building complex in Pasteur and the Gedebage building complex on Soekarno Hatta street which is about 5 to 20 km. The Geological Survey Center has duties and functions including conducting research, geological mapping and geophysics.
Many data from field research and laboratory processing that must be immediately reported or integrated with one another become late due to slow data delivery and many other problems.
Seeing the above conditions, it is necessary to have data communication technology that can handle the above. The right network system to handle this, one of which is to utilize Metropolitan Area Network (MAN) network technology.
Metropolitan Area Network (MAN) network is basically a type of LAN that is larger in size and usually uses the same technology as a LAN. MAN can include corporate offices that are located adjacent to or also a city and can be used for personal (private) or public.
The scope of this MAN is between 10 to 50 km, this MAN is the right network to build a network between offices in one city between factories / agencies and head office within reach.