Bedienungsanleitung Aeta Scoopy plus S (Seite 17 von 136) (Englisch)

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SCOOPY+ S - User Manual

2.1.2. ISDN interface

For access to the ISDN, the transmission interface is an S0 BRI (Basic Rate Interface), for transmission

over one to two 64 kbit/s B channels. Thus, the total available bit rate is 64 or 128 kbit/s.

The codec synchronises itself onto the ISDN network clock when a link is active.

Network protocols

Available protocols:

 "Euro ISDN" (or ETSI), default protocol valid for a large number of countries, especially all over

Europe.

 "NTT": valid for the Japanese network of NTT

 "NI-1": valid for numerous operators in North America. This choice is also suitable for the

connection to network equipment with "NI-2" protocol".

 In North America (USA and Canada), the available interface is often a U0 interface (instead of S0). In

such case an "NT1" network adapter must be inserted between the line and the SCOOPY+ S. Such

adapter can be found on the local market.

5A System®

Setting an ISDN connection is often difficult, at least because of the numerous coding parameters to be

set. Moreover, with most proprietary algorithms, it is mandatory for the two devices to have exactly the

same settings, otherwise the connection will fail, and sometimes it is not easy to find out the reason.

5A stands for Aeta Audio Advanced Automatic Adjustment. This system makes it easier to set an ISDN

connection, because the codec, on receiving a call, automatically adjusts itself, following the calling

party algorithm and parameters.

When the 5A System is enabled on the unit and a call is received, the unit first detects the coding

algorithm used by the calling codec, and also senses its parameters: audio mode (mono, stereo…),

sampling rate, bit rate, inverse multiplexing protocol, etc. Then the unit can decode the compressed

audio from the remote unit. In addition, the unit will use these same settings for encoding and sending

audio to the remote unit, so that the remote unit can also decode the outgoing audio programme. The

whole process just takes a few seconds. Of course, all compatible coding configurations can be detected

automatically by the 5A System.

Note that the 5A system is only active for ISDN connections.

J52

The ITU-T J52 recommendation was defined in order to allow the interoperability of multimedia

terminals over the ISDN1, using common coding standards. It includes the following features:

 Support of ITU-T recommended coding algorithms: G711, G722, MPEG Layer II

 Framing as per ITU-T H221 recommendation, ensuring byte synchronisation and interchannel

synchronisation when more than one 64 kbit/s B channel is required for the desired bit rate;

 Interoperation procedures according to ITU-T H242 recommendation;

 In the case of MPEG encoding, optional protection against transmission errors (Reed-Solomon

error correction codes).

Details about MPEG and J52 can be found in the annexes (refer to 8.1, Additional information on the

algorithms and protocols used).

1 J52 is only relevant for ISDN connections

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