Ethernet service on ATM

The ATM Circuit expansion technology allows service providers to map multiple VLANs to one virtual circuit or map multiple virtual circuits to one VLAN. Using this technology as a component, service providers can establish a Multi-Point-to-multi-point network on ATM and Ethernet to provide enterprises with more flexible and scalable Ethernet-based services.
In terms of concept, it is quite simple to provide the Ethernet service on the ATM network, but it encapsulates the ATM transmission stream into the data packet, then, a label is appended to the packet and the packet is sent over the Multi-Protocol Label Switching (MPLS) network. Encapsulation of Ethernet and ATM Transmission streams is the essence of this concept.

Standards Organizations are still arguing over the best way to encapsulate ATM while the Marini draft is actually used for Ethernet standards. At the same time, it is hoped that the service providers that provide Ethernet-based services through the ATM network will face the dilemma of waiting for the advent of the mpls atm encapsulation standard or the deployment of proprietary solutions that are likely to change.
However, service providers can use the ATM circuit extension technology to provide Ethernet-based services on ATM. ATM Circuit expansion technology maps one or more Ethernet VLANs to an ATM virtual circuit. Thus, the service provider can map multiple virtual circuits to one virtual circuit, or map multiple virtual circuits to one VLAN. This technology enables service providers to build a multi-point to multi-point network using low-cost Ethernet technology, providing enterprises with the following Ethernet-based services: point-to-point LAN extension services; point-to-point LAN to LAN services; multi-Point to multi-point LAN to LAN Service.
To expand the VLAN transmission stream between two user sites, the service provider needs to configure the logical port as the 802.1Q VLAN port and map the user's VLAN to a virtual circuit on the appropriate ATM port.
Service providers can also set service types for specific VLANs or applications. Service providers can use rate shaping technology to expand bandwidth on virtual circuits over VLANs. rate shaping can ensure bandwidth throughout the network.
When starting the LAN service, the service provider must configure multiple virtual circuits for the ATM access port to multiple user sites and map the VLAN to each virtual circuit. Service providers can also map IEEE 802.1p to ATM service quality parameters to set service types for specific VLANs or applications.
Once an ATM virtual circuit is mapped to an Ethernet VLAN labeled with 802.1Q, these VLANs can be mapped to an MPLS tunnel. By introducing MPLS to their networks, carriers can use this technology to provide value-added two-layer VPN services and three-layer VPN services.
For enterprises with multiple campuses, Ethernet-based services provide enterprises with a more flexible and scalable way to connect offices located in different regions. By using the point-to-point LAN extension service, that is, the Virtual Private LAN Service, enterprises can connect multiple sites to a VPN.
The Ethernet-based service also gives enterprises more control over the bandwidth allocated to different applications. The flexibility of Ethernet technology makes it possible to allocate bandwidth on demand. enterprises can configure incremental bandwidth for each department, application, or office. As users are provided with more direct and immediate control over their services, operators can increase satisfaction and reduce user turnover in the increasingly competitive market.
The ATM Circuit expansion technology provides a path for migrating networks that meet future needs. Service providers can use this path to provide Ethernet to enterprises.