# Multi-service access node

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A **multi-service access node** (**MSAN**), also known as a **multi-service access gateway** (**MSAG**), is a device typically installed in a [telephone exchange](/source/Telephone_exchange) (although sometimes in a roadside [serving area interface](/source/Serving_area_interface) cabinet[1]) which connects customers' telephone lines to the [core network](/source/Core_network), to provide [telephone](/source/Telephone), [ISDN](/source/ISDN), and [broadband](/source/Broadband) such as [DSL](/source/DSL) all from a single platform.

Prior to the deployment of MSANs, telecom providers typically had a multitude of separate equipment including [DSLAMs](/source/DSLAM) to provide the various types of services to customers. Integrating all services on a single node, which typically [backhauls](/source/Backhaul_(telecommunications)) all data streams over [IP](/source/Internet_Protocol) or [Asynchronous Transfer Mode](/source/Asynchronous_Transfer_Mode) can be more cost effective and may provide new services to customers more quickly than previously possible.

A typical outdoor MSAN cabinet consists of narrowband ([POTS](/source/Plain_old_telephone_service)), broadband ([xDSL](/source/XDSL)) services, batteries with rectifiers, [optical transmission](/source/Fiber-optic_communication) unit and copper [distribution frame](/source/Distribution_frame).

## See also

- [IMS](/source/IP_Multimedia_Subsystem)
- [Next-generation network](/source/Next-generation_network)
- [Video-ready access device](/source/Video-ready_access_device)

## References

1. ["Purpose of MSAN - Multi-Service Access Node - technopediasite-Ultimate Resource For Telecom Technical Support"](https://www.technopediasite.com/2019/03/purpose-of-msan-multi-service-access.html). *www.technopediasite.com*. Retrieved 2020-03-06.

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Adapted from the Wikipedia article [Multi-service access node](https://en.wikipedia.org/wiki/Multi-service_access_node) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Multi-service_access_node?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.