Appendix F Routing and Signalling Concepts

All setup requests, travel on reserved channel 0/5 (VPI=0, VCI=5 on root virtual port 0), but the ATM switch will assign an incoming and outgoing VPI and VCI on a particular port, for the connection through the switch. Therefore, an ATM virtual circuit is a sequence of switch VPI/VCI translations.

The value of the VPI and VCI within a particular ATM cell header will change as the ATM cell is switched through the ATM network. In a single switch configuration a cell’s VPI and VCI are translated only once, but in a multiple switch environment a cell’s VPI and VCI may be translated many times. VPI and VCI values are assigned symmetrically, that is, the same values are reserved in both directions across a link. This means that all virtual circuits are inherently bi-directional. This does not imply that SVC traffic must be sent in both directions; it can be either bi-directional or uni-directional. With point-to-multipoint virtual circuits, data is only sent from the root (source) to the leaves (destination parties).

Note: On a given link, VPI/VCI identifiers are assigned in both directions of a circuit. However if a circuit is uni-directional, one of these will not be used.

Note: A cell’s VPI and VCI are of local significance only. They identify the cell as being associated with a particular virtual circuit through a single link.

When the M770 ATM Switch receives a cell, it examines the ATM cell header to determine the VPI/VCI on which the cell was transmitted. Using this information, the M770 ATM Switch determines the destination port and appropriate VPI/VCI for the transmission of the ATM cell.

For example, in a single switch environment the switch can be configured such that a cell received on port A with VPI.VCI=0.35 is switched to port B with VPI.VCI=0.72. The translation from input port VPI and VCI to output port VPI and VCI is carried out by the switch hardware.

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M770 specifications

The Avaya M770 is a highly advanced media processor that is part of Avaya's robust suite of communication solutions designed for enterprise environments. This powerful device caters to the needs of modern businesses, providing an efficient platform for managing voice, video, and data communications.

One of the standout features of the Avaya M770 is its high-density processing capability. The device can handle a significant volume of calls concurrently, which makes it an ideal solution for large organizations requiring a reliable communication backbone. The M770 supports a variety of codecs, ensuring high-quality audio and video transmission, which is pivotal for maintaining clarity during communication.

Incorporating cutting-edge technologies, the Avaya M770 is built upon a scalable architecture that allows for easy expansion as business needs evolve. This scalability means organizations do not have to invest in new equipment every time they grow; they can simply add additional resources to the existing system. This makes the M770 a cost-effective solution in the long run.

The M770 also boasts advanced security features, essential for protecting sensitive communications within a business. It employs encryption protocols to safeguard data and voice transmissions, ensuring that corporate information remains secure from potential cyber threats. This focus on security is increasingly critical in today's interconnected world, where data breaches can have devastating consequences.

Another notable characteristic of the Avaya M770 is its integration capabilities. The device can seamlessly connect with Avaya’s suite of applications and third-party solutions, enabling businesses to create a unified communications environment tailored to their specific needs. This interoperability allows for a more streamlined workflow, enhancing productivity within the organization.

Furthermore, the M770 features intuitive management tools that simplify the administration of telephony systems. With a user-friendly interface, IT administrators can easily monitor performance, manage resources, and troubleshoot issues. This ease of use reduces the time and effort needed for system management, allowing IT teams to focus on strategic initiatives.

In conclusion, the Avaya M770 is a comprehensive media processing solution that combines scalability, security, and ease of integration to meet the demands of contemporary enterprises. With its ability to support high-density communications and its advanced management capabilities, it serves as a critical asset for businesses looking to enhance their communication infrastructure.
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