14
ScoopTeam - User manual - Draft 0002
Remote control via IP
In addition, the Ethernet interface can be used for configuring or remote controlling the unit. Refer to
chapter 2.5, “User interface and control for more information on this feature.
2.3.2. ISDN interface
For access to the ISDN, the transmission interface is one S0 BRI (Basic Rate Interface), for transmission
over one to two 64 kbit/s B channels. Thus, the total available bit rate ranges is 64 or 128 kbit/s.
In “double codec” mode, each of the possible links uses one B channel on this single line.
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 ScoopTeam. Such
adapter can be found on the local market.
5A System
(
NYA
)
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, dual mono…),
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 relevant for ISDN connections.
J52 (
NYA
)
The ITU-T J52 recommendation was defined in order to allow the interoperability of multimedia
terminals over the ISDN
1
, 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;
1 J52 is only relevant for ISDN connections
