Appendix F

Routing and Signalling Concepts

This chapter describes how the Avaya M770 ATM Switch switches ATM cells through an ATM network, and provides background information about the concepts of routing and signalling.

Switching ATM cells through the ATM network

There are two types of connection that can be used to switch ATM cells through an ATM network.

Permanent Virtual Circuits (PVCs), which are created manually by the network administrator. Every switch through which the connection will pass will need to be configured separately. PVCs are used for communication between two endpoints, through a pre-configured circuit, until the administrator disables the PVC and frees the connection.

Switched Virtual Circuits (SVCs), which are established on demand by UNI (User-to-Network Interface)/NNI (Network-to-Network Interface) signalling protocols. SVCs are used for communication between two endpoints until one endpoint clears the connection. There are two types of SVCs:

Point-to-point virtual circuits

Point-to-multipoint virtual circuits.

In an ATM network, an end-station can establish a SVC to another end-station by transmitting a signalling call setup request across the network. This request is routed across the ATM network to the destination end-station. If the destination agrees to accept the connection, a SVC is set up across the ATM network, between the two end-stations.

Virtual Circuits and Virtual Paths

In ATM networks data is multiplexed on physical links using virtual circuits and virtual paths. A virtual circuit is a channel of communication that allows data transfer between two ATM devices. A virtual path is used to group virtual circuits within the same transmission medium so that they can be switched together. Virtual circuits are identified by an unique Virtual Circuit Identifier (VCI). Virtual paths are identified by an unique Virtual Path Identifier (VPI).

Figure C.1 shows how virtual circuits are bundled together within a virtual path.

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Avaya M770 manual Routing and Signalling Concepts, Switching ATM cells through the ATM network

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.