Integrated access device

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An Integrated Access Device ( IAD ; " Integrated Access Device ") is a device for the network termination of NGN connections at the subscriber .

The IAD assumes the function of a media gateway in the NGN as a terminal device installed at the subscriber . In addition to a DSL modem, it also contains telephony interfaces for connecting conventional analog telephones or ISDN terminals to the telephone connection implemented on the basis of IP telephony . In addition, triple play / IPTV- enabled IADs have interfaces for connecting to AV devices.

In the case of NGN connections, in addition to the DSL modem, it also replaces the NTBA (in the case of ISDN) and in the case of entertainment offers based on triple play, it also partially replaces the function of digital receivers . Analog telephones / terminals are connected to the IAD instead of the TAE socket .

In the simplest case, an IAD consists of a DSL modem and an analog telephone adapter (ATA).

"ISDN connections" implemented via DSL are often only simulated using the Session Initiation Protocol (SIP) and, despite the S ₀ interface on the IAD, they may lack the properties and service features of a full Euro ISDN connection (e.g. B- channel bundling , group 4 fax with 64 kbit / s). Alternatively, with ISDN over IP, a proprietary protocol would be available that can provide significantly more ISDN services.

IADs terminated NGN connections lack the power supply through the switching equipment, as is found with conventional analog or ISDN main connections. This is why an NGN connection via an IAD is not suitable, for example, for house emergency calls or similar services that require high availability.