Which switching technique is used in ATM?

Which switching technique is used in ATM?

ATM provides functionality that uses features of circuit switching and packet switching networks. It uses asynchronous time-division multiplexing. In the OSI reference model data link layer (layer 2), the basic transfer units are generically called frames.

How cell switching is done in ATM?

An ATM switch is responsible for cell transit through an ATM network. The job of an ATM switch is well defined. It accepts the incoming cell from an ATM endpoint or another ATM switch. It then reads and updates the cell header information and quickly switches the cell to an output interface towards its destination.

Why ATM is asynchronous?

Asynchronous, in the context of ATM, means that sources are not limited to sending data during a set time slot, which is the case with circuit switching, used in the old standby T1. ATM transmits data not in bits or frames, but in packets. In short, data is sent asynchronously and cells are sent synchronously.

What is ATM switching?

ATM switches are high-speed packet switches specialized to process and forward ATM cells (packets). Since ATM is a connection-oriented protocol, ATM switches must establish a virtual connection from one of its input ports to an output port before forwarding incoming ATM cells along that virtual connection.

Is ATM a distributed system?

Asynchronous Transfer Mode (ATM) is one of the most widely-accepted and emerging high-speed network standards which can potentially satisfy the communication needs of distributed network computing. Each API represents distributed programming at a different communication protocol layer.

Which type of network is used in ATM?

ATM is based on the efforts of the ITU-T Broadcast Integrated Services Digital Network (BISDN) standard. ATM uses both switching and multiplexing, and it can provide very high bandwidth with few delays. Instead of using frames like Ethernet uses, ATM uses 53-byte, fixed-size cells.

What are the important features of an ATM switch?

The following features are found in an ATM network:

  • Interface types. The interface between ATM switches is called a Network to Network Interface (NNI).
  • Switch types. ATM switches come in a variety of types and sizes.
  • Attached devices.
  • Link speeds.
  • Attach media.

Why is packet switching needed?

Packet switching is used to optimize the use of the channel capacity available in digital telecommunication networks, such as computer networks, and minimize the transmission latency (the time it takes for data to pass across the network), and to increase robustness of communication.

Which one is better ATM or IP?

It is important to understand that both protocols are best effort services only, although ATM assumes links are highly reliable and have very low rates of cell loss and cell corruption, while IP makes no such assumption.

How many transmission paths are used in ATM?

ATM standard uses two types of connections. i.e., Virtual path connections (VPCs) which consists of Virtual channel connections (VCCs) bundled together which is a basic unit carrying single stream of cells from user to user.


Asynchronous Transfer Mode (ATM) is a WAN technology that uses fixed length cells. ATM cells are 53 bytes long, with a 5-byte header and 48-byte data portion. ATM allows reliable network throughput compared to Ethernet.

Is ATM still used?

ATM is a network mechanism intended to accommodate real-time traffic as well as bulk data transfer. We present ATM here as a LAN layer, for which it is still sometimes used, but it was originally proposed as a replacement for the IP layer as well, and, to an extent, the Transport layer.

What kind of switch is an ATM switch?

This page covers ATM (Asynchronous Transfer Mode) Switch Architecture basics. It also describes VP/VC switch and VP ATM switch with table. ATM Switch: The Switch which works on packet switching technology to allow voice, data, image and video traffic over high speed single access circuit is known as ATM Switch.

What are the typical transfer speeds of ATM?

Typical ATM speeds vary with transmission media and can include: 25 Mbps over unshielded twisted-pair (UTP) category 5 cabling 622 Mbps and 4.8 Gbps over fiber-optic cabling only ATM also includes a mechanism for allocating bandwidth dynamically; that is, bandwidth is allocated only in required amounts and the required direction.

What are the disadvantages of an ATM switch?

Of course, it has some disadvantages as well. For example, it is overhead of cell header (5 bytes per cell), has complex mechanisms to achieve QoS. The congestion can cause cell loss. An ATM switch is very expensive compared with the LAN hardware.

How are ATM cells transported in a switch?

In the ATM switch, the ATM cells have to be transported from an inlet to one or more outlets. This switching from inlet to outlet can be combined with concentration/multiplexing and expansion/demultiplexing of the ATM traffic. In most switching architectures, all functions are available in one or another combination.