nemo voice quality guide.pdf

Air Interface Measurement Tool

Nemo Voice Quality Guide

© 2007 by Anite Finland Ltd. All rights reserved.

This manual, as well as the software described in it, is furnished under license and may only be used or copied in accordance with the terms of such license. The information in this manual is intended for informational use only and is subject to change without notice. Anite Finland assumes no responsibility or liability for any errors or inaccuracies that may appear in this user manual.

Except as permitted by such license, no part of this publication may be reproduced or transmitted in any form or by any means, electronic, mechanical, recording, or otherwise, without the prior written permission of Anite Finland Ltd.

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Revision 4.22.1, Last edited May 2007

3 Nemo Vo ice Qua lit y Guide

CONTENTS

VOICE QUALITY MEASUREMENTS 4

VOICE QUALITY SYSTEM DESCRIPTION 5

SETTING UP THE SYSTEM 6

CONNECTING NEMO OUTDOOR MULTI DEVICE 6 CONNECTING VOICE QUALITY DEVICES 8 MODIFYING THE NEMO AUDIO MODULE (EVOQ) FOR DIFFERENT TERMINALS 13

DEASSEMBLING THE EVOQ MODULE 13 ASSEMBLING THE EVOQ MODULE 14

MAKING VOICE QUALITY MEASUREMENTS 15

MOBILE-TO-MOBILE VQ MEASUREMENTS 15 MOBILE-TO-FIXED-TO-MOBILE VQ MEASUREMENTS 24

APPENDIX 1 30

NEMO SERVER INSTALLATION 30 Audio Test Installation 30 Configuring the Server 31

INDEX 36


VOICE QUALITY MEASUREMENTS

Nemo Outdoor supports mobile-to-mobile and mobile-to-fixed-to-mobile measurements. The measurements enable the assessment of the quality of voice during voice calls as perceived by end-users. The measurement is based on the ITU-T recommendation P.862.1 and it produces a PESQ score that is mapped on an EMOS (Estimated Mean Opinion Score) scale. The Nemo Voice Quality system setup consists of Nemo Outdoor, 1-4 mobiles, 1-4 audio modules, and the Nemo multi rack.

In mobile-to-mobile measurements, one terminal is calling another and the mobiles send a test sample in one or both directions. These measurements present the combination of the uplink quality of the transmitting terminal and the downlink quality of the receiving terminal.

In mobile-to-fixed-to-mobile measurements, a terminal calls a fixed number (PSTN) that is connected to a Nemo Server with the Audiotest option. These measurements present the downlink quality of the terminal at the Nemo Outdoor end, the uplink quality of the terminal at the server end, and the downlink quality of the receiving terminal.


VOICE QUALITY SYSTEM DESCRIPTION When Nemo Outdoor calls the fixed line connected to the server, the server answers the call and Nemo Outdoor/Audio module starts sending the configured test sample. The server records 1.5 seconds of incoming audio after which it compares the recorded sample and chooses the best matching sample from the default samples. After the identification, the server sends the identified, non-degraded sample to Nemo Outdoor that records it and calculates the PESQ score. Along with the test samples, short pseudo-noise bursts can be heard between the samples. They are used for synchronization purposes and do not affect the PESQ score because they are eliminated before the calculation.

After receiving the test sample, Nemo Outdoor sends the same sample to the server. This time the server recognizes the sample, records it for the duration of the identified sample, calculates the score, opens a measurement file, and stores the result there. The file is closed when the line is dropped.

The test goes on alternating until Nemo Outdoor drops the call or the pseudo-noise sync bursts are not detected for four consecutive times by either end. As the dropped line sound varies greatly in different countries, it might be that the server does not detect the sound. The server can detect up to 3 pre-programmed dropped-line sounds. In case the server does not detect the line drop, it takes up to 30 seconds for the server to automatically hang-up the line as it drops the call after four consecutive pseudo-noise bursts are missing.

♦ Note that sometimes the first pseudo-noise sync burst that is longer than a mid-call burst can be lost due to an initial handover. In such a case, the server and Nemo Outdoor cannot synchronize. In this case, what happens next depends on the side where it was missing: server hangs up in 30 seconds and Nemo Outdoor in 15 seconds so the worst case is 45 seconds. Set one minute between calls to be sure that the server is ready before the next call comes.


SETTING UP THE SYSTEM

This chapter will describe the steps for setting up and configuring the voice quality measurement system. Please install the Nemo Outdoor software first. Refer to the Nemo Outdoor user manual for detailed instructions.

CONNECTING NEMO OUTDOOR MULTI DEVICE When there are two or more audio modules in use, the Nemo Outdoor Multi device is required for measurements. This chapter describes the installation of the Multi device.

There is a status led at the back of the Multi unit which will blink either red, amber, or green. Please observe the led during installation and use as it will indicate whether the Multi unit is working properly or not.

Red: This light signifies the loss of USB communication with the host. If the loss is due to unplugging the unit, the light will blink red a few times before turning green when it is reconnected. Otherwise, the light indicates a problem with the (Edgeport/8) drivers, which may need to be reinstalled. The red will also blink during installation until the installation is complete.

Amber (orange): This light signifies serial port activity on the MMAC2 (Edgeport/8). The amber light may also flash briefly during installation.

Green: This light indicates that the serial ports are successfully set up and the MMAC2 (Edgeport/8) is operating normally.

∇ Installing and connecting the Nemo Outdoor Multi device:

1. Before connecting the Multi device to your computer, insert the Nemo Outdoor installation CD-ROM disk with the Edgeport/8 driver file into the CD-ROM drive.

2. Switch on the computer. Switch on power in Multi holder from the power switch at the back of the Multi unit.

3. Connect the USB cable to the Multi holder and the other end to your computer. Windows will detect the USB hub automatically.

4. Windows will detect the new Edgeport/8 device. Drivers are found on the Nemo Outdoor installation CD-ROM. Click Yes in the Digital Signature Not Found dialog box if it appears. Windows® 2000 may find many new devices. Wait until the process is finished.


5. Go to the Device Manager (Start | Settings | Control Panel. Double-click on System and in Hardware tab click the Device Manager button). Double-click on Ports. There should be eight new COM ports. If not, start from the beginning.

♦ Port numbers are arranged so that the port marked as Port1 on the multi device is the first of the new COM ports (e.g., COM49), Port2 is the second new COM port (e.g., COM50), etc.


CONNECTING VOICE QUALITY DEVICES ♦ Please complete the Nemo Outdoor Multi installation first as the Voice Quality devices are

connected to the COM port provided by the Multi mobile holder.

1. As described in the Multi device set-up, there are eight new COM ports. Connect the trace cable between the audio module and the MMAC unit. Insert plug A in a serial port on the MMAC unit and plug B on the connector marked COM on the audio module.

♦ Port numbers are arranged so that the port marked as Port1 on the multi device is the first of the new COM ports (e.g., COM49), Port2 is the second new COM port (e.g., COM50), etc.

A B


2. Use the three-headed DKU-2 trace/audio cable to connect the test terminal and the audio module. Insert plug A to the test terminal, plug B to a free USB port on your computer/MMAC unit, and plug C to the connector marked Phone on the audio module.

A B

C


3. Connect the power cable between the audio modules and the MMAC unit. Insert the A plugs to the connectors marked Power on the audio modules and B plug in the front panel of the MMAC unit. A green led should light up.

4. Start Nemo Outdoor. In the Configuration Manager, click Add and select the device. The Phone Properties dialog box is opened.

Power cable for the audio modules

A

A

B


5. Select the two ports assigned to the mobile as Trace Port and Modem Port. You can check the ports from the Phone and Modem Options dialog (Start | Settings | Control Panel | Phone and Modem Options, Modems tab). Select the port with the smaller number as the modem port and the port with the bigger number as the trace port, e.g., COM59 as trace port and COM58 as modem port.

6. In the VQ Device Port, select the COM port where the serial cable of the audio module is connected. For example, the serial cable is connected to port number 4 in the Multi unit (in the front and middle). Go to the Device Manager. Under Ports you see eight Edgeport items. Count to the fourth item and check the COM port number, COM52 in the example below.


7. Do not select anything in the Dial-Up Connection fields.

♦ Note that you need to add and configure each mobile separately. If you have several mobiles and audio modules, make sure that you select the correct ports for each mobile + audio module combination.

8. Click OK. The test terminal will start and initialize the audio module. You are now ready to start the measurements.

9. Remember to check that the audio (earphone) level of the test mobile is at minimum.


MODIFYING THE NEMO AUDIO MODULE (EVOQ) FOR DIFFERENT TERMINALS

Depending on the terminal used with the EVOQ module, the module needs to be modified accordingly. The terminals are either used by common ground cables or differential ground cables. The table below shows the terminal model and ground type.

Terminal Differential Ground Common Ground Jumper J9 in place

Nokia terminals

6230, 6230i, 6280,

6630, 6650, 6651,

6680, N75, N80

Yes No

Nokia N95, Nokia 7376 Yes Yes

LG VX8x00 series Yes Yes

If the purchased voice quality system includes both differential and common ground terminals, the EVOQ modules are by default set for differential ground.

DEASSEMBLING THE EVOQ MODULE

1. Remove the cover from EVOQ module by unscrewing the four M4*6 screws.


2. Remove the pc board from the box by unscrewing the screws shown in picture 2.0. Make sure you are ESD protected to avoid damaging the pc board.

3. Install jumper J9 in place as shown in the picture below.

ASSEMBLING THE EVOQ MODULE Place the pc board back into the box and tighten the screws. Place the cover on top of the box and tighten the screws.


MAKING VOICE QUALITY MEASUREMENTS

After software installations and hardware setup you are ready to start the measurements. You will receive some default test samples along with Nemo Outdoor but if you wish to use your own samples, please read the requirements below.

Test sample requirements:

• 8kHz sampling rate

• 16-bit linear PCM

• signal scaled to 90% of full scale

• band-pass filtered with corner frequencies at 250Hz and 3500Hz

• minimum duration of each sample: 2 seconds

• maximum duration of each sample: 6 seconds

Server-side limitations, that do not affect mobile-to-mobile testing, are:

• maximum of 6 samples total in server test-sample folder

• the first 1.5 seconds have to be different in each sample

MOBILE-TO-MOBILE VQ MEASUREMENTS

∇ Making mobile-to-mobile voice quality measurements:

1. Connect the Nemo audio modules and test mobiles to the Nemo Outdoor measurement system (see page 8).

♦ Remember to check that the audio (earphone) level of the test mobile is at minimum and the alert and warning tones are switched off.

2. Define the voice quality settings for the first mobile, i.e., the mobile that you are calling from.


• Open the Measurement Properties, Script dialog box for the first mobile (Measurement | <device> | Script Properties).

• Click the Script Editor button to create a new script.

• In the Script Editor, click Add and select Voice Call from the menu.


• In the Voice Call Properties dialog box:

o Define the phone number of the second mobile, i.e., the mobile that you are calling.

o Select the Voice Quality check box and set Voice Quality Mode to Half Duplex Start TX.

o Select one of the default test samples - 3s.wav, 4s.wav, 5s.wav, 6s_m.wav, 6s_f.wav, or 6s.wav – in the Reference Sample Filename field.

o Set the Delay from End of Call to New Call parameter to one minute. Click OK.


• In the Script Editor dialog box, define how many times you would like to repeat the script by editing the Repeat Script parameter.

• Click Save and type a file name for the script. Finally click Close.

3. Define the voice quality settings for the second mobile, i.e., the mobile that you are calling to.

• Open the Measurement Properties dialog box for the second mobile (Measurement | <device> | Measurement Properties).


• In the Measurement Properties, Configuration dialog box, click the Properties button next to the Voice Number field.



o Define the phone number of the first mobile, i.e., the mobile that you are receiving calls from.

o Select the Voice Quality check box and set Voice Quality Mode to Half Duplex Start RX.

o Define a Prefix for the received files. The prefix will be added at the beginning of the file name of all received files.

o Select one of the default test samples - 3s.wav, 4s.wav, 5s.wav, 6s_m.wav, 6s_f.wav, or 6s.wav – in the Reference Sample Filename field. Select the same file as for the other mobile. Click OK.

4. Open a line graph for viewing the voice quality data. Select Data | Graph | Line | New. In the empty graph, click the Add New Layer button .


5. In the Device field, select the device that is receiving the calls. This is because the receiving device calculates the voice quality results. In the Y field, select Audio Quality Mean Downlink and click OK.

6. Right-click on the graph and select Parameters.


7. In the Parameters dialog box, expand the Voice Calls item and scroll down to the Audio Quality item. Select the Audio Quality check box to select all items under it. Click OK.

8. Click the Start Recording button . Click the Start/Stop Scripts button to start the measurement. Nemo Outdoor will run through the script and make the voice quality measurements.


MOBILE-TO-FIXED-TO-MOBILE VQ MEASUREMENTS ♦ Please complete the Nemo server installation before continuing. See Appendix 1 for

detailed instructions.

∇ Making mobile-to-fixed-to-mobile voice quality measurements:

1. Connect the Nemo audio modules and test mobiles to the Nemo Outdoor measurement system (see page 8).

♦ Remember to check that the audio (earphone) level of the test mobile is at minimum and the alert and warning tones are switched off.

2. Define the voice quality settings in the Voice Call Properties dialog box:

• Set Voice Quality Mode to Half Duplex Start TX.

• Select one of the default test samples: 3s.wav, 4s.wav, 5s.wav, 6s_m.wav, 6s_f.wav, 6s.wav. Make sure that the server has the same samples in its reference sample folder (see Nemo Server installation guide for details).

• Set the time between calls parameter to one minute.

3. If you are using scripts, click the Start/Stop Scripts button to start the measurement. Nemo Outdoor will run through the script and make the voice quality measurements.

4. If you are performing measurements manually, select Make/End Voice Call from the Measurement menu or by clicking the Make/End Call button. With each voice call, the voice quality measurement is run.

5. Define the voice quality settings for the mobile.

• Open the Measurement Properties, Script dialog box for the mobile (Measurement | <device> | Script Properties).


• Click the Script Editor button to create a new script.

• In the Script Editor, click Add and select Voice Call from the menu.



o Define the phone number of the fixed end, i.e., the server that is answering the calls and sending back the samples.

o Select the Voice Quality check box and set Voice Quality Mode to Half Duplex Start TX.

o Select one of the default test samples - 3s.wav, 4s.wav, 5s.wav, 6s_m.wav, 6s_f.wav, or 6s.wav – in the Reference Sample Filename field. Please make sure that the same reference file exists also on the server (see chapter Nemo Server Installation on page 30 for details).

o Set the Delay from End of Call to New Call parameter to one minute. Click OK.


• In the Script Editor dialog box, define how many times you would like to repeat the script by editing the Repeat Script parameter.

• Click Save and type a file name for the script. Finally click Close.

6. Open a line graph for viewing the voice quality data. Select Data | Graph | Line | New. In the empty graph, click the Add New Layer button .


7. In the Device field, select the mobile connected to the system. In the Y field, select Audio Quality Mean Downlink and click OK.

8. Right-click on the graph and select Parameters.


9. In the Parameters dialog box, expand the Voice Calls item and scroll down to the Audio Quality item. Select the Audio Quality check box to select all items under it. Click OK.

10. Click the Start Recording button . Click the Start/Stop Scripts button to start the measurement. Nemo Outdoor will run through the script and make the voice quality measurements.


APPENDIX 1

NEMO SERVER INSTALLATION Please refer to the enclosed IBM server installation documents how to setup the power, keyboard, mouse, and display.

Do not connect the server to the Internet at this time. The firewall of the server is active but the root (that is the superuser account on Linux) password is weak by default, which makes the server vulnerable to intrusions.

Change the root password first:

1. Boot the server. Wait until the logon prompt appears.

2. Log on as root.

• Username: root

• Password: nemonemo

After the logon has completed, Fedora Core 2 desktop appears.

3. Select the Terminal / Command Line icon from the bottom row (second from left). The following prompt refers to console commands from now on: [root@nemoserver root]#

4. Password can be changed with command passwd: [root@nemoserver root]# passwd

Changing password for user root.

New UNIX password:

Retype new UNIX password:

passwd: all authentication tokens updated successfully.

Create the new password according to the following guidelines:

• Do not use common words or names

• 8 characters long

• Has upper and lower case characters, numbers and special characters

• Following is an example of such password (do not use this): 6yV-1pSc

After the root password has been changed to a stronger one, it is safer to connect with Internet.

Please note that Anite Finland cannot guarantee absolutely safety when the server is connected to the Internet, especially if the data test option is installed. This is because the data test option has active, public services like FTP, WWW, POP3, and SMTP that can be (or become) vulnerable. However, the server has a precisely configured firewall that should prevent all common intrusions.

Audio Test Installation Server has 4 to 12 analogue Loop Start (FXO) RJ11 ports for connecting with POTS (PSTN) lines.


1. Connect lines to RJ11 connectors that are located at the rear side of the server. There is no need to configure the number of each line.

2. Switch on the server and wait until the Login prompt appears. The server is then operational.

There is no need to log on unless one wants, for example, to configure network settings as described in chapter Configuring the Server on page 31.

Configuring the Server These settings are optional.

Changing Network Settings 1. Log on as root.

• Username: root

• Password: nemonemo

Note: At this time the root password should be different than shown here as it has been changed previously (see page 30).

After the logon has completed, Fedora Core 2 desktop appears.

2. Select the Terminal / Command Line icon from the bottom row (second from left).

In Fedora Core 2, or Linux generally, network interfaces are named as eth0, eth1, etc. so that the last number is different for each interface. The following interfaces are installed in each data test option:

Data test options Available network interfaces NONE lo, eth0 1 Data test option lo, eth0, eth1, eth2, eth3, eth4 2 Data test options lo, eth0, eth1, eth2, eth3, eth4, eth5, eth6, eth7, eth8

Note: A special interface lo is the local loop-back interface that is used by the operating system for local communications.

Each of these interfaces have separate start-up scripts and these scripts are located in folder /etc/sysconfig/network-scripts/ and are named like this: script for eth0 is ifcfg-eth0, script for eth1 is ifcfg-eth1, and so on.

By editing these scripts it is possible to switch between DCHP and manually assigned IP addresses.

3. Change the interface eth0 settings with the following command (replace eth0 with other interface if needed):

[root@nemoserver root]# cd /etc/sysconfig/network-scripts

[root@nemoserver root]# vi ifcfg-eth0

Now the vi-editor opens. By default the configuration uses DHCP and shows:

DEVICE=ETH0


ONBOOT=yes

BOOTPROTO=dhcp

Set the vi-editor to insert-mode by pressing sequence Esc i

Note that all vi-editor commands are case-sensitive.

Change the configuration to static IP:

DEVICE=ETH0 ONBOOT=yes BOOTPROTO=static BROADCAST=192.168.10.255 IPADDR=192.168.10.1 NETMASK=255.255.255.0 TYPE=Ethernet

Note that parameters IPADDR, NETMASK and BROADCAST are supplied by ISP, and BROADCAST are optional.

Save the script and close the vi-editor by pressing sequence Esc : x. Repeat the procedure for each network interface that should have a static IP address.

Changing Audio-Test Settings 1. Log on as root and select the Terminal / Command Line icon from the bottom row.

2. Audio-test service settings can be changed by editing file /usr/vqd/voiceqd.conf

[root@nemoserver root]# vi /usr/vqd/voiceqd.conf

Instructions for using vi-editor can be found from previous chapter.

This is the default configuration:

# Anite Finland voice quality configuration

# Note: This config is case sensitive, do not change parameter names

# Directory from where reference samples are auto-loaded (max 8 samples!)

SampleDir ./test_samples

# Directory where test results will be stored (each call -> new file)

ResultsDir /home/nemotest/results

# Start- and re-sync samples (do not change)

StartSyncSample ./sync_samples/start_sync.wav


ReSyncSample ./sync_samples/re_sync.wav

# Software and hardware gain settings

# If the audio signal is too saturated or too weak it can cause quality loss

# In these cases try to decrease (saturated) or increase (too weak) hwgain 1db at a time

SwTxGain 10.0

HwTxGain 10.0

# Enables/disables console output

EnableConsole 1

# Enables/disables socket server (do not enable!)

EnableSocket 0

The most important settings are SW and HW Gain settings. Because the actual analogous PSTN line levels may vary greatly on different places it might be necessary that gain settings should be adjusted.

Maximum values for both are 12.0, do not exceed this limit. If the test sample speech – when listened from mobile end – sounds distorted, lower both values by 1.0 and try again until best score is achieved. And if the speech sounds too weak and scores are lower than expected, increase both gains by 1.0 until best score is achieved.

3. After the configuration has been modified, the voiceqd service has to be restarted. This command stops the process:

[root@nemoserver root]# /usr/vqd/vqd-run stop

Service is then automatically restarted by the system after 1 minute max.

Changing Audio-Test Samples

By default, reference samples are located in folder /usr/vqd/test_samples

This folder can be changed for example to /home/nemotest/samples if one wants to upload new test samples via FTP. However, new samples will be loaded by vqd service only when it starts so after new samples are in place, reboot the server or use the method described in previous chapter to restart the service.

Note that there should be maximum 8 samples total in the samples folder – if there are more, the server may not have enough time to identify the sample during first receiving from field end.


Running Voiceqd Service Manually In case one wants to observe the voiceqd service operation in real-time, the service can be run manually on the terminal.

Crontab is a system where certain tasks can be run at given intervals. In this case a script that checks whether the voiceqd service process is up and running runs once every minute.

1. Log on as root and select the Terminal / Command Line icon from the bottom row.

2. Crontab settings can be changed by editing the file /etc/crontab

[root@nemoserver root]# vi /etc/crontab

Instructions for using the vi-editor can be found from the previous chapter.

Enter insert-mode (Esc i) and find the line that reads:

* * * * * root /usr/vqd/vqd-run.sh > /dev/null

That line should be commented out, and comments begin with character #:

# * * * * * root /usr/vqd/vqd-run.sh > /dev/null

After the change, save and close (Esc : x) and the service will not be automatically restarted anymore.

After the Crontab has been modified, the voiceqd service has to be stopped:

[root@nemoserver root]# cd /usr/vqd

[root@nemoserver root]# ./vqd-run stop

Now the service can be run manually and it writes the log output - in addition to log file - to the

terminal where it runs:

[root@nemoserver root]# ./voiceqd

If you want to re-enable the automatic restarting, just repeat the previous procedure and uncomment the above-mentioned line.

Log Instructions

The logs of the vqd-service are located in the /usr/vqd folder and they look like this:

20050421_2035_log.txt


The easiest way to retrieve the logs is to put them into a tar archive and to send them by e-mail.

1. Log in and open console as described earlier. Go to the /usr/vqd folder.

[root@nemoserver root]# cd /usr/vqd/

2. Create a new archive named logs.tar and put all logs in it

[root@nemoserver root]# tar –cf logs.tar *log.txt

3. Compress the archive

[root@nemoserver root]# gzip logs.tar

4. Move it to folder /home/nemotest, download it by FTP and send by e-mail as an attachment.

[root@nemoserver root]# mv logs.tar.gz /home/nemotest


INDEX

A

audio module...................................................................... 8 audio test samples ............................................................ 33

C

changing audio-test settings ............................................. 32 changing network settings................................................ 31 COM ports ..................................................................... 7, 8 configuring the server ...................................................... 31 connecting voice quality devices ....................................... 8

D

Delay from End of Call to New Call.......................... 18, 26 Device Manager ................................................................. 7 DKU-2 trace/audio cable ................................................... 9 dropped line ....................................................................... 5

E

Edgeport/8 .......................................................................... 6 Edgeport/8 driver ............................................................... 6 EMOS ................................................................................ 4 Evoq ................................................................................. 13

H

Half Duplex Start TX................................................. 18, 24

I

installing and connecting Multi device .............................. 6 ITU-T recommendation P.862.1 ........................................ 4

L

log instructions ................................................................. 34 Loop Start (FXO) RJ11 port ............................................ 30

M

mobile-to-fixed-to-mobile.................................................. 4 mobile-to-fixed-to-mobile voice quality measurements .. 24 mobile-to-mobile................................................................ 4 mobile-to-mobile voice quality measurements ................ 15 modem port ...................................................................... 11

Modifying the Nemo Audio Module ............................... 13 Multi................................................................................... 6

N

Nemo Outdoor installation CD .......................................... 6 Nemo Outdoor Multi ......................................................... 6

P

Phone and Modem Options.............................................. 11 pseudo-noise ...................................................................... 5

R

Reference Sample Filename ............................................ 18 RJ11 ................................................................................. 31 root password................................................................... 30

S

sampling rate .................................................................... 15 serial cable ....................................................................... 11 serial port ........................................................................... 8 server installation............................................................. 30 status led ............................................................................ 6 SW and HW gain settings ................................................ 33 synchronization.................................................................. 5

T

test sample requirements.................................................. 15 trace cable .......................................................................... 8 trace port .......................................................................... 11

U

USB cable .......................................................................... 6 USB hub............................................................................. 6

V

vi-editor............................................................................ 31 Voice Call Properties................................................. 18, 26 voice number.................................................................... 20 voice quality settings ....................................................... 15 VQ Device Port................................................................ 11

nemo voice quality guide.pdf

Documents

quality of voice

mobile measurements

downlink quality

mobile vq measurements

uplink quality

nemo server installation

nemo outdoor calls

nemo outdoor end