Aeta Audio Systems SCOOP 5 User manual

Stereo audio codec for real time audio transmission
User Manual

Scoop5 S - User Manual
Table of contents
1. Presentation –Getting started................................................................ 1
1.1. Install and connect Scoop5 S ..................................................................................... 3
1.2. Audio settings........................................................................................................... 3
1.3. Select and set up network to be used: wired networks.................................................... 3
1.4. Select and set up network to be used: mobile networks.................................................. 5
2. Functions ............................................................................................ 7
2.1. Transmission interfaces.............................................................................................. 8
2.2. Audio encoding and decoding ................................................................................. 15
2.3. Audio interfaces...................................................................................................... 20
2.4. Auxiliary functions ................................................................................................... 21
2.5. Supervision and control interface .............................................................................. 24
3. Operation .......................................................................................... 26
3.1. General principles –Control means.......................................................................... 26
3.2. Physical description of the equipment ........................................................................ 27
3.3. Installation and set up ............................................................................................. 35
3.4. Initial setup of the Ethernet interface.......................................................................... 37
3.5. Managing links....................................................................................................... 39
3.6. First level maintenance ............................................................................................ 43
4. Detailed operating mode –User interface .............................................. 46
4.1. Equipment start-up.................................................................................................. 46
4.2. Principles for the navigation ..................................................................................... 46
4.3. Dialing and text input keypad ................................................................................... 48
4.4. Description of the menus ......................................................................................... 49
4.5. Setting up a link...................................................................................................... 65
4.6. Management of the configuration profiles.................................................................. 80
4.7. Restricted operation mode ....................................................................................... 81
4.8. Clearing all settings ................................................................................................ 82
4.9. Backing up and restoring the configuration................................................................ 82
4.10. Specific display screens.......................................................................................... 83
5. Operating mode –Embedded HTML pages............................................. 85
5.1. Accessing the Scoop5 S html pages .......................................................................... 85
5.2. Principles of operation with html pages...................................................................... 86
5.3. “Status” tab............................................................................................................ 87
5.4. “Connections” tab .................................................................................................. 88
5.5. “Profiles” tab.......................................................................................................... 89
5.6. “Network” tab ........................................................................................................ 90
5.7. “Audio” tab............................................................................................................ 93
5.8. “Coding” tab ......................................................................................................... 94

Scoop5 S - User Manual
5.9. “Misc” tab..............................................................................................................95
5.10. “Maintenance” tab ................................................................................................96
5.11. “Alarm” tab ........................................................................................................ 100
6. Technical characteristics ....................................................................101
6.1. Characteristics of interfaces .................................................................................... 101
6.2. Audio performance................................................................................................ 110
6.3. Network protocols and ports................................................................................... 112
6.4. Power supply ........................................................................................................ 113
6.5. Dimensions and weight .......................................................................................... 113
6.6. Environmental characteristics .................................................................................. 113
6.7. Options ............................................................................................................... 114
6.8. Accessories and related products ............................................................................ 115
7. Annexes...........................................................................................116
7.1. Additional information on the algorithms and protocols used...................................... 116
7.2. Overview of the SIP protocol................................................................................... 117
7.3. Some methods to deal with NAT routers and firewalls................................................ 119
7.4. V35 interface adaptation........................................................................................ 124
7.5. Notice regarding open source code ........................................................................ 125
8. Index ...............................................................................................126

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1. Presentation –Getting started
The Scoop5 S codec allows the bi-directional transmission of one or two audio signals with bit rate
reduction, over various transmission media: digital leased lines, ISDN lines, PSTN telephone lines, IP
protocol networks, mobile networks…
The standard version of the codec includes an Ethernet interface for IP transmission, and X24/X21
interfaces for transmission over digital leased lines. The unit can be complemented with many options
providing additional network interfaces, coding algorithms, etc.
One outstanding feature of AETA codecs in ISDN mode is the 5A System: on receiving an incoming
ISDN call, the unit can automatically detect the coding algorithm and parameters of the calling
codec, and then adjust itself in a compatible configuration so that the connection succeeds regardless
of the initial configuration and that of the remote unit.
In IP mode, the codec features the same ease of operation thanks to the use of the SIP and SDP
protocols.
For ISDN transmission, the unit can be operated in a “double codec” mode. It is then equivalent to
two independent mono codecs, each running G711 or G722 over a B channel of the ISDN (interface
#1).
This chapter gives basic instructions for a quick start. It obviously does not provide all the information
for full control. For comprehensive information one can refer to the rest of this manual:
Chapter 2 describes all the functions and features of the Scoop5 S (but not necessarily with
all the operating modes)
Chapter 3 gives a physical description of the unit, shows its setting up and operation
principles.
Chapter 4 details menus and operating modes.
Chapter deals with using the html server embedded in Scoop5 S
Chapter 6 provides all the technical characteristics of the Scoop5 S
The annexes bring miscellaneous additional information, including an index you can use to
look for a given information topic.
The following table shows the main features of the product. Functions marked with in this table are
available as options.
5AS = Aeta Audio Advanced Automatic Adjustment System

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Characteristics
Optional
Transmission interfaces
Ethernet/IP transmission interface
Ethernet Interface, 10BaseT / 100BaseT; TCP/IP, UDP/IP, RTP protocols
Audio transmission (AoIP) in unicast mode: SIP signalling protocol, SDP, RTP streaming
Net bit rate 12 to 256 kbit/s (depending on coding algorithm, linear coding excluded)
Leased line transmission interfaces
Two X24/X21/V11/V35 interfaces;
64, 128, 192, or 256 kbit/s over one interface (selectable)
ISDN transmission interfaces

One or two S0 interfaces
Single codec 64, 128, 192 or 256 kbit/s, or double G711/G722 codec 64 kbit/s
5AS auto configuration on incoming calls
Transmission interface on PSTN telephone line (“POTS”)

One “2 wire” telephone interface
« POTS codec » mode with integrated V34 modem and CELP coding, 12 to 24 kbit/s
Mobile network access

Integrated 2G/3G/3G+/LTE network access module, 2 antenna sockets
Voice mode: standard telephone or “HD Voice” (7 kHz with AMR-WB)
Packet data mode: IP protocol, SIP signalling, SDP, RTP streaming, net bit rate 12 to 256 kbit/s
(depending on coding algorithm)
External 3G/LTE module connection via USB socket (data mode only)
Audio coding algorithms
(audio modes)
G711 (standard ISDN telephony, AoIP)
GSM, AMR (mobile telephone)
AMR-WB / G722.2 (mobile “HD Voice”
G722 SRT, H221, H242
CELP 7 kHz
MPEG Audio Layer II
MPEG AAC-LC , HE-AAC, HE-AAC v2
4 sub-band ADPCM (low latency)
OPUS (AoIP only)
Linear L16, L20, L24
TDAC (ISDN mode only)
Mono
Mono
Mono
Mono
Mono
Mono, Stereo, Double mono, Joint stereo
Mono, Stereo
Mono, Stereo
Mono, Stereo
Mono, Stereo
Mono

Audio interfaces
Two analog inputs and two analog outputs with adjustable gain
Digital input and output, AES/EBU format
Level display for encoder inputs and decoder outputs
Stereo headphone socket for monitoring, switchable send/receive
Auxiliary functions (available depending on transmission interface)
Relay transmission: 2 isolated inputs and 2 isolated outputs, 6 non isolated inputs and outputs
Data channel with RS232 serial port, 300 to 9600 bauds
SMS reception via the optional mobile access
Control and supervision
Keyboard and graphic display on front panel
Programmable set-up/dial memories
Ethernet/IP remote control
Embedded html server
Remote control serial port, isolated control and status loops
Secondary Ethernet interface for remote control

Table 1 –Main features of the Scoop5 S

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1.1. Install and connect Scoop5 S
Plug on a power source: the Scoop5 S automatically starts up. To put it on stand-by or restart
it, press the key (top left corner on the front panel) for at least 3 seconds.
Connect the necessary audio interfaces (details: page 31)
Connect Scoop5 S on the transmission network (details: page 31 and following)
Using the Scoop5 S menus: key or key to activate the main menu, use the arrows to
select a sub-menu or a parameter, enter or validate with the key. jumps back up to
the previous menu level, until getting back to the base screen (with level display).
(details: page 46)
1.2. Audio settings
With factory settings, the active inputs are the analog ones, and clipping level is set at
+16 dBu for both inputs and outputs.
Enter the menus using , select Setup then Audio. Perform necessary settings; see details
further on page 58.
1.3. Select and set up network to be used: wired networks
Select network: Setup menu then Network, then select Change Network, . In the
proposed choice, select the desired network (ISDN, LL, Ethernet, POTS). Validate with .
Select the audio coding: menu Setup / Algorithm, then Other, then . Browse the
available choice with the arrows, and make a selection with . Restart the same procedure
to change for another coding setup.
 The available choice depends on the transmission network! For more details on coding,
see page 15.
1.3.1. Set up an ISDN link
If needed, select the protocol with Setup / Network / ISDN Parameters / Protocol. More
details: see page 54.
Enter the remote number to dial, using the keypad, and press the key.
If more than one B channel is involved due to the coding algorithm used, you must enter a
second number, then , and so on. If the last dialled number is adequate, just confirm by
pressing without typing a number again.
Hang up with the key to release the connection (you must confirm by pressing again).

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1.3.2. Set up a (wired) IP link
Over a public IP network, and especially when no SIP server is used, it is highly
recommended to use a STUN server.
The address of a STUN server can be set in the Scoop5 S html pages (see page 91) or via the
menu: Setup / Network / AoIP Parameters / STUN Server, enter the address of a STUN
server (we propose our server stun.aeta-audio.com, look also the support pages on our web site
www.aeta-audio.com). Enable or disable STUN with Setup / Network / AoIP Parameters /
STUN Mode.
More details: see page 120.
Check the Ethernet interface is active (indicator on the display and/or LED on the Ethernet
socket on the back), and check an IP address is allocated: menu Tools / About / Local IP.
Come back to the main menu.
The default setting uses a DHCP server to get an IP address, which is suitable for most
occasions. In other situations, look for more details on page 37.
Using the keypad, enter the remote number to call (numeric IP address, or SIP URI if a SIP
server is used), then press the key.
Hang up with the key (you must confirm by pressing again).
When using a SIP server, some data must be entered beforehand using the AoIP Parameters
menu; for more details, refer to page 52.
1.3.3. Set up a POTS link
For connecting the line, you must plug in ISDN socket #1 an adapter cable (included with
the POTS option), which provides an RJ45 socket for the ISDN line on one hand, and on the
other hand an RJ11 socket. Plug the POTS line in the latter.
If needed, adjust the POTS line parameters using Setup / Network / POTS Parameters.
Details on these settings: see page 55.
Enter the remote number to dial, using the keypad, and press the key.
Hang up with the key to release the connection (you must confirm by pressing again).
1.3.4. Set up a leased line (LL)
No connection procedure is involved with such link, as it is automatically set (or reset) as soon as the
needed connections are done and the settings are correct on both sides of the link.
See in this manual on page 54 for configuration details.

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1.4. Select and set up network to be used: mobile networks
To set links over a mobile network, an antenna connection is required (more details on page 34), and
you must have a SIM card with a subscription suitable for the use. Specifically, for an IP mode
transmission the subscription must include access to data transmission, and RTP audio streams must
be allowed.
While the unit is switched off, insert the SIM card into the drawer on the rear side of the
Scoop5 S.
Switch on the Scoop5 S (depress a few seconds).
Select the network: Setup menu then Network, then select Change Network, . In the
proposed choice, select the desired network (Mobile (Int.)). Validate with .
Enter the menu Setup / Network / Mobile Parameters / PIN. Enter the PIN code for the
SIM card using the keypad then .
1.4.1. Set up a link in voice mode
This mode allows communicating with any telephone terminal through the regular telephone service. It
also allows to benefit from the 7 kHz wide band service known as “HD Voice” whenever the remote
terminal is compatible and the network supports the service.
In the menu Setup / Network / Mobile Parameters, select Mode / Cellphone
Afterwards, go to the menu Setup / Network / Mobile Parameters. In the sub-menu
Preferred Techno, if needed you can select a priority among the 2G, 3G and 4G networks.
The normal choice is Auto.
The Network Select menu enables you to select among the available operators, if your
mobile subscription entitles you to do so.
Come back to the main menu. Enter the remote number to dial, using the keypad, and press
the key.
Hang up with the key to release the connection (you must confirm by pressing again).

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1.4.2. Set up a (mobile) IP link
Over a public IP network, and especially when no SIP server is used, it is highly
recommended to use a STUN server.
The address of a STUN server can be set in the Scoop5 S html pages (see page 91) or via the
menu: Setup / Network / AoIP Parameters / STUN Server, enter the address of a STUN
server (we propose our server stun.aeta-audio.com, look also the support pages on our web site
www.aeta-audio.com). Enable or disable STUN with Setup / Network / AoIP Parameters /
STUN Mode.
More details: see page 120.
In the menu Setup / Network / Mobile Parameters, select Mode / IP Mode
Come back to the menu Setup / Network / Mobile Parameters. In the sub-menu
Preferred Techno, if needed you can force a priority for 3G or 4G networks. The standard
setting is Auto.
Still in the Setup / Network / Mobile Parameters menu, enter the sub-menu Access Point
/ APN: enter the operator’s APN code, using the keypad, then press .
Come back to the previous level (Setup / Network / Mobile Parameters) by pressing .
Go to the Data Active line and press to activate the mobile data (the box is then
checked)1.
Come back to the base screen using the key.
Select the audio coding: menu Setup / Algorithm, then Other, then . Browse the
available choice with the arrows, and make a selection with . Restart the same procedure
to change for another coding setup.
 For more details on coding, see page 15.
Using the keypad, enter the remote number to call (numeric IP address, or SIP URI if a SIP
server is used), then press the key.
Hang up with the key (you must confirm by pressing again).
When using a SIP server, some data must be entered beforehand using the AoIP Parameters
menu; for more details, refer to page 52.
Note: the sequence is much simpler for further calls as long as you keep the same SIM card,
because the network related settings are kept memorized even if the unit is switched off; so you
don’t need to make these settings again (IP Data mode, APN, data activation...). It is even possible
to memorize the PIN code: check the box in Setup / Network / Mobile Parameters /PIN Save.
1Like on a smartphone, this data activation stays memorized, and you need not do this again each time the unit starts. Conversely, make
sure to disable it if later you don’t want any data traffic.

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2. Functions
Reminder: this chapter details the functions and capability of the Scoop5 S, but not necessarily
describes the detailed operating modes, developed in other chapters.
The following block diagram shows the basic functions of the equipment.
Figure 1 –Functional diagram of the equipment
The audio signals to be transmitted are converted (when needed) to digital format, then the encoding
function reduces the bit rate, using a selectable algorithm; the resulting bit flow is sent to one of the
available transmission interfaces: Ethernet interface, permanent link data interfaces (X21/X24/V35),
ISDN interface(s), PSTN interface, mobile network...
The transmission interface functional block also extracts compressed data coming from the network
and sends them to a decoding block that reproduces uncompressed audio data. Last, the audio
signals are output to both digital and analogue outputs.
Monitoring the audio interfaces is possible thanks to a headphone and level meters for the
inputs/outputs.
In addition to the main task of transmitting an audio programme, the Scoop5 S can also transmit
auxiliary information, usually by embedding them inside the transmitted audio streams.
Supervision and controlling the unit is performed using various remote control interfaces, and of
course by means of the displays and controls on the front panel.

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2.1. Transmission interfaces
The Scoop5 S features in all versions an Ethernet interface for IP protocol networks, and leased line
transmission interfaces (X24/V11).
One or two ISDN interfaces optionally come in addition, as well as PSTN/POTS and mobile network
access.
2.1.1. Ethernet/IP interface
The IP interface is a 10BaseT/100BaseT Ethernet interface allowing transmission of the audio
programmes in a wide range of possible bit rates. The audio stream is always transported under the
RTP/UDP protocol.
IP unicast mode
The most classical transmission mode is unicast: audio connection with one distant device, generally
bidirectional. This mode can be used on all types of networks links, LAN or WAN, including links via
Internet. The Scoop5 S implements the SIP protocol, which allows it to interoperate with IP phones and
other SIP compatible audio codecs, in a way similar to ISDN or POTS connections. Links can be set
up in two ways:
“Peer to peer” connection between two compatible units
Use of a SIP proxy server to set up the link, or a SIP PBX
Details about the SIP protocols can be found in the annex (see 7.2, Overview of the SIP protocol).
The audio coding algorithm can be selected depending on the required quality and the available
network bandwidth. The following algorithms are currently available:
Codec
Bit rate
(coding)
Bit rate
(total)1
Audio
bandwidth
Typical use, main features
G711
64 kbit/s
86 kbit/s
3 kHz
Voice, telephony
Compatible with IP phones
CELP
24 kbit/s
28,5 kbit/s
7 kHz
Suitable for high quality speech;
Low network bandwidth consumption
G722
64 kbit/s
86 kbit/s
7 kHz
High quality speech.
Compatible with some IP phones.
MPEG Layer II
64 to 256
kbit/s
73 to 275
kbit/s
Up to
20 kHz
Highest quality, suitable for speech and music
MPEG AAC-LC
16 to 256
kbit/s
30 to 277
kbit/s
Up to
20 kHz
Low bit rate, suitable for speech and music
MPEG HE-AAC
and HE-AAC v2
16 to 128
kbit/s
23 to 139
kbit/s
Up to
20 kHz
Very low bit rate, suitable for speech and
music
4SB ADPCM
128 or 256
kbit/s
173 or 301
kbit/s
15 kHz
Low latency, suitable for speech and music
OPUS
12 to 256
kbit/s
28 to 272
kbit/s
Up to
20 kHz
Low bit rate and low latency, suitable for
speech and music
Linear
L16/L20/L24
512 to
2304 kbit/s
592 to
2384 kbit/s
Up to
20 kHz
Best quality, very low latency
Table 2 –Overview of algorithms available in IP mode
1Informative value; higher than the “net” encoded audio bit rate because of the protocol overhead

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SIP and SDP protocols
The SIP protocol is a signalling protocol, used for IP connections, which allows the Scoop5 S to
interoperate with IP phones and other SIP compatible audio codecs, in a way similar to ISDN or POTS
connections. Details about the SIP protocols can be found in the annex (refer to 7.2, Overview of the
SIP protocol).
One significant advantage is the inclusion of SDP, a protocol which allows the connecting devices to
automatically negotiate and agree on the coding profile to use. Thanks to this system, it is not
necessary to set the units in the same way before setting up a connection. Moreover, the calling party
needs not know how the remote unit is configured before initiating a link.
Note: the SIP protocol does not mandatorily imply the use of a server. Codecs can set up point-to-
point links using this protocol, and benefit from some its advantages.
Packet duplication
Scoop5 S also proposes an RTP transmission mode with enhanced reliability, using packet replication.
When enabling this mode, every packet is transmitted twice; with such system a lost packet has no
effect since the receiver still gets the other copy of the packet. In this way, stable links can be obtained
even with a high packet loss rate. Of course, as a disadvantage the bit rate is double; you must make
sure this stays compatible with the transmission medium.
Remote control via IP
In addition, the Ethernet interface can be used for configuring or remote controlling the unit, with two
control methods:
Scoop5 S provides html pages which allow to get complete control over the unit using a web
browser, via port 80 (default port for http protocol). See in chapter the detailed operating
mode.
The supervision software Scoop Manager from AETA can remote control the Scoop5 S via a
TCP/IP connection on port 7001.
TCP port 6000 can be used for “command line”control, suitable for other codec supervision
software such as TeleScoop, Codec Live, MDC.Net, etc.

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2.1.2. Leased line interfaces
For transmission over leased lines, the codec includes two X24/V11 ports which can run at 64 kbit/s,
128 kbit/s, 192 kbit/s and 256 kbit/s bit rates.
Only one X24/V11 port is used, selectable among the two physical interfaces. The other, however,
sends the same data as the active one, and it can be used e.g. for a redundant link.
For “leased line” transmission, the codec synchronises on the network clock provided by the X24/V11
interface. If no suitable clock is present, the system folds back to an internal clock.
2.1.3. ISDN interfaces
For access to the ISDN, the transmission interface is one or two S0 BRI (Basic Rate Interface), for
transmission over one to four 64 kbit/s B channels. Thus, the total available bit rate ranges from 64 to
256 kbit/s.
In “double codec”mode, only the first BRI is used, with each of the possible links using one B channel
on this single line.
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 Scoop5 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.

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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 7.1, Additional information on the
algorithms and protocols used).
It must be noted that, thanks to the interoperation protocol, J52 codecs, when setting up a link, can
negotiate automatically and agree on a configuration that is compatible with the capability of both
units (regarding bit rate, channel mode, etc.). In this way, when the units differ in their capability (or
make), the resulting configuration may be different from expected beforehand, but in most cases the
link will work and audio will be transmitted.
As another useful consequence, this also gives users more tolerance to mistakes when configuring the
units on the two sides of the transmission links, as the codecs will adapt automatically even with
differences in the initial settings of the two units.
Symmetric or asymmetric coding
In most operating cases, the codec sets up symmetrical links, wherein the encoder and decoder use
the same encoding/decoding algorithm with same settings (channel mode, etc.). In other words, the
link is “full-duplex” and the same encoding/decoding type is used on both directions.
For a link over the ISDN, in fact there are cases when the link is asymmetric, with a different coding
mode in each direction. This may happen in some cases with the J52 protocol. To give some
examples, it is possible to send MPEG Layer II in one direction and receive G722 in the reverse
direction, or send MPEG stereo and receive MPEG mono, etc.
2.1.4. POTS interface
The interface is a “two wire” analog telephone access, with characteristics adjustable depending on
the country. Dialling normally uses DTMF, but for older switching equipment it is possible to use pulse
dialling.
Scoop5 S includes a V34 modem which transmits via this line a bidirectional audio flow, encoded at a
nominal 24 kbit/s bit rate. Depending on the line quality and the quality of the link with the remote
codec, this bit rate is automatically negotiated and dynamically adjusted from 12 to 24 kbit/s.
A “protected“ mode can be activated, which increases the resilience to transmission errors, at the cost
of a higher latency (encoder to decoder delay). You must make sure to set this parameter the same
way on both devices / both ends of the link.
1J52 is only relevant for ISDN connections

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2.1.5. Mobile network access
Units equipped with the “Wireless”option include an integrated module for access to mobile
networks, and a holder for a SIM card.
Depending on the version the accessible networks are 2G (GSM, EDGE), 3G (UMTS), 3G+ (HSDPA,
HSUPA, HPA…), and 4G/LTE.
For the operation, at least one multiband antenna (to be selected for compliance with the mobile
network characteristics) must be connected on Scoop5 S. An antenna “diversity” feature gives an
opportunity to improve the stability when the radio reception quality is poor, by connecting a second
antenna.
Lastly, Scoop5 S can display the received SMS messages.
Mobile voice mode –HD Voice
The integrated module allows to use the mobile phone service, for communicating with all ISDN or
PSTN telephone terminals or hybrids, or with other mobile terminals. The quality is in such case that of
mobile connections, with a 300-3400 Hz bandwidth and coding such as GSM, EFR, AMR...
Now many mobile networks also propose “HD Voice”, an extension of this mobile telephone service.
With this new capability, compatible terminals implement the AMR-WB coding algorithm (standardised
as G722.2 by the ITU-T) and provide speech transmission with a 50-7000 Hz bandwidth and a
quality very similar to the well-known G722. Automatic fallback to the standard coding takes place if
the network does not support the service or one of the terminals does not feature this capability.
No special subscription, other than to the regular telephone service, is needed, but for most operators
only the 3G/3G+ base stations support the service.
This sometimes makes people believe that HD Voice is related to the mobile IP service, but this is
definitely not the case.
More and more mobile phones now support this service, especially (but not only, and not all)
smartphones. All AETA codecs with “HD-4G” mobil network option support HD Voice, namely:
Scoop 4+ in “wireless” version
Scoopy+ HD (except old units, in doubt consult us)
ScoopFone HD, ScoopFone HD-R.
Scoop 5 and Scoopy+ with the HD-4G option
ScoopFone 4G and ScoopFone 4G-R
Scoop5 S

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Mobile IP mode
The other service available with mobile access is the data packet transmission mode, abbreviated as
“PS” (for Packet Switched), with IP protocol.
This mode brings similar capabilities as a wired IP connection via the Ethernet interface, as described
above in 2.1.1, with some distinctive characteristics:
This requires a subscription including access to the data service, with conditions compliant
with the application. Among other requirements, an APN (Access Point Name) must be
provided that allows this type of media stream.
The available bit rate depends on various factors; first the network technology
(2G/3G/3G+/4G…), but also the traffic level in the radio cell, the operator’s network
capacity, possibly the type of subscription. This may bring on restrictions for the usable
compression algorithms.
Setting a link implies first activating the data connection, before actually initiating an audio
stream transmission link
Using an external USB module
Instead of the integrated module, it is possible to plug a USB mobile module or “key”, in order to
access mobile IP transmission, with more or less similar conditions as described above.
However be aware:
This capability is optional
The USB module must be from the list of devices supported by AETA. As this list is evolving,
please check our web site for up to date information.
The “HD Voice” mode is not available in this way
USB devices do not feature antenna diversity
2.1.6. Managing calls
Apart the LL mode (leased line) which is for a permanent connection, the audio transmission implies a
link/session setup phase.
One of the transmission interfaces is selected as the default interface on the Scoop5 S.
A call towards a remote unit, initiated by the user of the Scoop5 S, is implicitly sent through this
default interface.
On the other hand, an incoming call on any interface (regardless of the default interface) can be
processed and the link established, under following conditions:
The “called”interface must be connected and active. As an example, for mobile IP the data
connection must be active.
The codec must not be already busy with another connection.
If the call comes on an interface other than the default interface, the codec first switches to the
suitable interface, and then processes the incoming call. When the link is released, it will come back
to its previous state (and default interface).

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2.1.7. Securing a link with a backup connection
When a fixed link (LL) is used, it is possible to use another network access in order to set a temporary
backup link in case the nominal LL link fails. The unit will then switch to a backup mode (ISDN or IP
depending on the selected backup arrangement), and provide the audio transmission via the backup
network access. More precisely, on one end of the link the codec will switch to the backup mode and
“call” its counterpart via the ISDN or and IP network. On the other end the unit will switch to the
backup mode when it receives the call on its ISDN or IP interface. The operating mode and
configuration for this backup feature are detailed further in following sections (3.5.4, Setting up a
backup link).

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2.2. Audio encoding and decoding
Scoop5 S features a wide range of coding algorithms. Their availability depends on the transmission
network used. Besides, the MPEG family algorithms feature a large configuration flexibility.
The table below synthetically describes the capabilities with the various transmission media:
Table 3 –Available coding depending on network
This table applies to the normal mode, single codec.
In double codec ISDN mode, only G711 and G722 algorithms are available for each codec.
The following chapters bring some precisions about the important features of the various algorithms
and protocols available.
16 24 32 48 PSTN LL ISDN E thernet
3G+
LTE
UMTS Voice
G711 Mono 64
GSM, AMR Mono -
AMR- WB Mono -
CELP Mono
12 21.6
CELP Mono 24
G722 Mono 64
G722-H221 Mono 64
G722-H242 Mono 64
TDAC Mono 64
4SB ADP CM Mono 128
4SB ADP CM Stéréo 256 [2]
MP EG L2 M / S 64
MP EG L2 M / S 128
MP EG L2 M / S 192 [2]
MP EG L2 Stereo 256 [2]
MP EG L2 Stereo 384
AAC-LC M / S
16 56
AAC-LC M / S 64
AAC-LC M / S 96
AAC-LC M / S 128
AAC-LC M / S 192
AAC-LC Stereo 256
HE- AAC M / S
16 56
HE- AAC M / S 64
HE- AAC Stereo 96
HE- AAC Stereo 128
HE- AAC v2 Stereo
16 56
HE- AAC v2 Stereo 64
OPUS M / S
12 256
Linear L16 Mono 512 / 768
Linear L16 Stereo 1024 / 1536
Linear L20 Mono 640 / 960
Linear L20 Stereo 1280 / 1920
Linear L24 Mono 768 / 1152
Linear L24 Stereo 1536 / 2304
Possible audio bandwidth:
3 kHz 7 kHz
[2] : requires two ISDN lines
15 kHz 20 kHz
IP networks
Codec
Audio
channels
Frequency (kHz)
Net bit rate
(kbit/s)
Wired
Mobile

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2.2.1. G711 coding
Application: telephony, coordination. Low latency.
G711 is the standard coding used for voice transmission on public telephone networks, and features
300 to 3400 Hz audio bandwidth. This algorithm is typically used for links over IP networks with IP
telephones or VoIP gateways. Via ISDN, G711 is used for links with telephones or hybrid devices.
G711 is available only for IP or ISDN transmission.
2.2.2. Mobile telephony coding: GSM , AMR
Application: telephony, mobile coordination. Moderate latency.
These algorithms are exclusively used for speech transmission over mobile telephone networks, with a
300 to 3400 Hz audio bandwidth. Gateways perform, whenever needed, transcoding in order to
interface with fixed PSTN, ISDN and IP networks.
2.2.3. Mobile HD Voice coding: AMR-WB
Application: commentaries, mobile coordination. Moderate latency.
The AMR-WB coding (standardised as G722.2 by the ITU-T) is used between compatible mobile
terminals, when the mobile network supports the so called “HD Voice” service, and provides speech
transmission with a 50-7000 Hz bandwidth.
Scoop5 S automatically implements this algorithm in mobile voice mode every time it is possible, and
automatically falls back to standard voice coding if not (when network does not support, or the remote
terminal is not compatible).
Unfortunately it is not possible to see directly whether AMR-WB is active or not at a given moment.
You have to rely on your listening skills! However, it has to be active if the conditions are met: a)
support from the network on both sides of the link, b) both terminals compatible, c) service
continuity from end to end1
2.2.4. CELP coding
Application: commentaries, coordination. Low capacity transmission channels
This algorithm operates in mono for a net nominal bit rate of 24 kbit/s, and provides 7 kHz
bandwidth and a quality close to G722 for a much lower bit rate.
CELP is available for IP or PSTN networks. For PSTN (POTS), the bit rate may be reduced to adapt for
the line quality, among the following values: 12 kbit/s, 14.4 kbit/s, 16.8 kbit/s, 19.2 kbit/s,
21.6 kbit/s, 24 kbit/s. The bandwidth is reduced accordingly.
Still for POTS lines, in addition to the normal mode two “protected modes” are available, bringing an
increased resistance to transmission problems, however with an increased latency as well.
1At the time of writing, this requires both units to be on the same network: same operator, same country