VeEX TX50e Guide

TX50e e-Manual
Table of Contents
1 About the analyzer
2 Technical specifications
2.1 Output Line interface
2.3 Input Line interface
2.4 Transmitter
2.5 Receiver
2.6 Results
2.7 LED indication
2.8 Software Features
2.9 Hardware platform
3 General Description
3.1 Main Parts
3.1.1 Front panel
3.1.2 LED indicators description
3.1.3 Keyboard description
3.2 Specifications of the analyzer's components
3.2.1 Power supply unit
3.2.2 USB cable
4 Preliminary steps
5 Operation
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5.1 Main menu
5.2 Line interface
5.2.1 Mode
5.2.2 Frame structure
5.2.3 CRC-4
5.2.4 Line code
5.2.5 Transmitter synchronization
5.2.6 Long haul
5.2.7 Deviation
5.2.8 Test speed
5.2.9 Protective resistors
5.3 Test pattern
5.3.1 Send pattern
5.3.2 Type
5.3.3 Byte 1, Byte 2, Byte 3
5.3.4 Invert RX
5.3.5 Invert ТХ
5.4 Voice functions
5.4.1 Voice functions measurements
5.4.2 Voice function settings
5.5 Measurements
5.5.1 G821/G826/M2100
5.5.2 Propagation delay
5.6 View data
5.6.1 FAS/NFAS/Sa/Si
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5.6.2 CAS/MFAS
5.6.3 Frame monitoring
5.7 Insert errors
5.7.1 Error type
5.7.2 Speed
5.7.3 Count
5.7.4 Start/stop errors insertion
5.7.5 Alarm type
5.7.6 Time
5.7.7 Start/stop alarms generating
5.8 Pulse shape
5.8.1 Operation
5.8.2 Pulse shape monitoring
5.8.3 Oscilloscope
5.9 Jitter
5.9.1 Jitter measurements
5.9.2 Maximum Tolerable Jitter
5.9.3 Jitter Transfer Function
5.9.4 Jitter generation
5.10 Configuration
5.10.1 Basic settings
5.10.2 Line interface
5.10.3 Calibration mode
6 Warranty and software
7 About VeEX
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About the analyzer
TX50e is an advanced compact handheld analyzer/generator for E1 communications. It can be use for
installation, serve, and maintenance of 2Mbps transmission paths which contain voice, data service at 2.048
Mbps rate.
The test set is connected to the primary data transfer interface (ITU-T Recommendation G.703). It can be operate
as a generator/supervisor for different types of test signal in AMI and HDB-3 coding or as a monitor/signal
analyzer for PCM systems (ITU-T Recommendation 0.162)
Technical specifications
Output Line interface
Input Line interface
Transmitter
Transmitter Clock
Interface G.703
Connector RJ-45, banana or BNC
Rate 2.048 Mbit/s
Impedance 120 Ωbalance or 75 Ωunbalance
Pulse masks G.703
Line code AMI, HDB-3
Maximum peak to peak
jitter 0.015 UIpp (Conforms to G.823)
Interface G.703
Connector RJ-45, banana or BNC
Rate 2.048 Mbit/s
Impedance 120 Ωbalance or 75 Ωunbalance
Pulse masks G.703
Line code AMI, HDB-3
Maximum input jitter Conforms to G.823
Clock source From received signal
Internal: 2.048 Mbps ± 3ppm
External: 2.408 MHz or 2,048 Mbps
Internal clock stability 5 ppm
Frequency offset ± 6 KHz in 1 Hz resolution
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Frame structure
Test Pattern
Alarm and Errors
2048 kbit/s G704 PCM 30, PCM31 with/without CRC-4
Pattern types Fixed: All 1, All 0, 1010
PRBS: 2n-1 where n = 6, 9, 11, 15, 23
Pattern Standard O.153
O.152, O.153
O.151
O.151
O.151
Fixed word length 24 bit
Polarity Normal, inverted
Generation modes Single, continuous, user defined
Errors/Slips insertion Continuous or single
Errors rate 1 x 10-n, where n= 2 to 7
Alarm type LOS - Loss of Signal
AIS - Alarm indication signal
LOF - Loss of Frame alignment
RDI - Remote Alarm Indicator
LOM - Loss of CAS Multiframe Alignment
RMA - Multiframe Remote Alarm Indicator
LSS - Loss of Test Sequence Synchronization
ARTF: Unstructured alternating 1s and 0s.
Error type CODE - Code error
FAS - Frame alignment error
CRC - CRC-4 block error
REBE - CRC block error in remote end
BIT - Bit error in PRBS and fixed word
+SLP - Positive bit slip
-SLP - Negative bit slip
E-bit - Transmitted E-bit errors
MFAS - Multiframe Alignment Synchronization
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Receiver
Receiver Clock
Frame structure
Test Pattern
Detected events
Clock source Recovered form received data stream
2048 kbit/s G704 PCM 30, PCM31 with/without CRC-4
Pattern types Fixed: All 1, All 0, 1010
PRBS: 2n-1 where n = 6, 9, 11, 15, 23
Pattern Standard O.153
O.152, O.153
O.151
O.151
O.151
Fixed word length 24 bit
Polarity Normal, inverted
Alarm LOS - Loss of Signal
AIS - Alarm indication signal
LFA - Loss of Frame alignment
RDI - Remote Alarm Indicator
LOM - Loss of CAS Multiframe Alignment (SW-CAS)
RMA - Multiframe Remote Alarm Indicator (SW-CAS)
LSS - Loss of Test Sequence Synchronization
Errors and Slips CODE- Code error
FASE - Frame alignment error
CRC - CRC-4 block error
REBE - CRC block error in remote end
BIT - Bit error in PRBS and fixed word
+SLP - Positive bit slip (SW-ES)
-SLP - Negative bit slip (SW-ES)
MFSE – Multiframe Synchronization Error
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Jitter Measurements
Results
LED indication
LEDs on TX50e’s front panel display following receiver conditions:
Software Features
Oscilloscope Line signal
Interface 2.048 Mbit/s
Jitter measuring circuit
and filters Conforms to ITU 0.171
Frequency reference internal
Range 0.05 to 10 UIpp
Error Jitter measuring 0.025% ± 5% UIpp
Events Alarm counters
Errors counters
Bit Error Rate
Bit monitoring Timeslot 0 (FAS, NFAS)
Timeslot 16 (MFAS)
abcd signaling bits of all 30 channels
All timeslots (frame)
SIG Signal Presence
AIS Alarm Indication Signal (G.703)
FRM Frame Alignment Detected
MFR Multiframe Alignment Detected
RDI Remote Alarm Indicator
SES Severely Errored Seconds
If the BER value is more than 10ˉ³ in BER test mode or if
more than 30% CRC blocks are Errored in case of CRC
synchronization.
RMA Multiframe Remote Alarm Indicator
PAT Pattern Synchronization and Loss
GUI language English
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Hardware platform
General Description
Main Parts
Front panel
Front panel is made up of color LCD display, keyboard, and a row of three-color LEDs indications (see
Figure 3.1).
Software update USB
External power Input 100-240V AC, 50/60 Hz
Output 9V @ 0.8 A
Battery power rated voltage 4.8V
from interface USB
Dissipation 8 Watt
Autonomy mode 6 hours
Interface USB
Dimensions
(H x W x D) 85x155x40mm (6.1 x 3.34 x 1.57 in)
Weight 0.4 kg (0.88 lbs)
Display Backlight color LED
240x320 pixels
Input keyboard
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1. LEDs
Three-color LED indicators provide visual control for power supply, measurements and data receiving
conditions. The color of any LED would denote the following:
Green: Correct operation since LED reset.
Red: Alarm present.
Yellow: Since LED reset, at least one error has been registered.
2. Display
320 x 240 pixels, backlight color LCD.
3. Keyboard
15 button keyboard.
4. Power button (On/Off)
To switch the instrument on/off press the power button and hold it for 1-2 seconds.
5. Status bar shows following parameters (left to right):
{Internal battery voltage (in Volts) or an “USB/9V” sign in case of external power supply or USB-
interface is connected.
Figure 3.1: Front panel
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{“M”, “P” or “–“ symbols show state of measuring mode: “M” – measurements, “P” – pause, “–“ – no
measurements at the moment.
{“S” or “–“ symbols show state of the test pattern transmission mode: ”S” – transmission, “–“ – no test
pattern transmission.
{“A”, “Е” or “–“ symbols show the errors insertion mode state: “Е”– errors insertion, ”А” – alarms
generation, “–“ – normal operation.
{“V” or “–“ symbols show the voice function mode: “V” – VF insertion from the microphone, “– “ –
normal operation.
{Signal level at the Rx port (in dB).
{Current time.
LED indicators description
Power External power supply:
•No indication – no external power supply connected.
•Green – external power supply is connected.
•Green/Yellow (blinking) – internal battery is charging.
SIG Signal Presence:
•Green – signal detected.
•Red – loss of signal at the moment.
•Yellow – since reset, loss of signal has been registered at least once.
A
IS Alarm Indication Signal (all 1):
•Green – no AIS alarm has been registered since reset.
•Red – AIS alarm at the moment.
•Yellow – since reset, AIS alarm has been registered at least once.
FRM Frame Alignment Detected:
•Green – frame is synchronized.
•Red – loss of frame synchronization at the moment.
•Yellow – since reset, loss of frame synchronization has been registered.
MFR Multiframe Alignment Detected:
•Green – multiframe is synchronized.
•Red – loss of multiframe synchronization at the moment.
•Yellow – since reset, loss of multiframe synchronization has been registered.
RDI Remote Defect Indication:
•Green – no RDI detected.
•Red – RDI detected at the moment (bit A=1 in NFAS).
•Yellow – normal operation, but since reset, RDI has been registered.
SES
Severely Errored Seconds. If the BER value is more than 10ˉ³ in BER test mode or if more than 30%
CRC blocks are Errored in case of CRC synchronization:
•Green– normal operation since reset.
•Red– SES at the moment.
•Yellow– since reset, at least one severely errored second has been registered.
RMA Multiframe Remote Alarm Indicator:
•Green– no RMA detected.
•Red– RMA alarm at the moment.
•Yellow– normal operation, but since reset, RMA has been registered.
PAT Pattern Synchronization and Loss:
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•Green– test pattern detected.
•Red– loss of test sequence synchronization at the moment.
•Yellow– since reset, loss of pattern synchronization signal has been registered.
A
ny of described LED indicators (except the SIG indicator); will not lit if a corresponding event is not analyzed.
Keyboard description
zEnter :
This button provides following actions:
1. When navigating through menus, press this button to enter a highlighted menu.
2. When setting up parameters values, press the button to change current value or to move to a
submenu parameter selection. If the button performs data input function then use button to move to
previous menu.
zEscape : Press to move one menu up or to cancel a set value in the data input mode.
zMain menu : Use this button to move to the Main menu.
zFunctional buttons: F1, F2, F3, and F4.
zA button: To view information on the current hardware and software version.
zB button: Not implemented in the current release.
zCursor buttons: To navigate up, down, left, and right.
zOthers menu : (Figure 3.2) To reset LEDs, adjust LEDs’ brightness, Backlight, Contrast, and
Keyboard beep.
zPower On/Off: To switch the test set on/off press the button and hold it for 1-2 seconds.
Specifications of the analyzer's components
Power supply unit
Provides TX50e analyzer power from the mains and the test set built-in rechargeable battery.
Input: 100 - 240 V AC @ 50 - 60 Hz.
Output: 9V DC @0.8A.
USB cable
The USB cable provides the connection of the test set to a PC. Description of the cable's connector pins is shown
Figure 3.2: Others Menu
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in the table 3.2 below.
Preliminary steps
1. Unpack the TX50e analyzer. Check for the purchased items and any possible damage as the result of
shipment. Note: If there is any damage please contact VeEX customer service or the freight forwarder.
2. After unpacking, keep the instrument in normal environment conditions for at least 2 hours.
3. Plug the power supply unit into a mains electricity socket.
Before first use charge the internal battery for at least 30 minutes.
Maximum recharging time is about 8 hours. During battery recharging the instrument can still be used
normally.
NOTE: Installation of internal battery pack has to be done at the service center only.
4. When the power is on, the test set performs a self-diagnosis. When the self-diagnosis successfully
completes, the screen will display the Home menu.
Operation
Main menu
User interface of the TX50e test set is a system of menus which provides easy and quick access to any
application. The Home menu screen is shown at Figure 5.1.
Use the cursor to navigate the menu.
Line interface: Operational modes settings. Before operation, it is required to define parameters in this menu.
Test
p
attern: Test pattern parameters settings.
Table 3.2: USB-cable connector
TX50e Signal PC
1+5V 1
2D- 2
3D+ 3
4GND 4
Figure 5.1: Home menu
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Voice functions: It measures the tone signal level and frequency. The user can also set up parameters for voice
channel listening or audio data transmission.
Measurements: Provides the ability to measure basic performance parameters, G.821 and G.826/M.2100
parameters, and signal propagation delay. Measurement results can be saved as a file for further load and
analysis.
View data: Provides the ability to view contents of tested dataflow: frame or timeslot contents; FAS/NFAS,
CAS/MFAS words.
Insert errors: To insert errors or generates alarms of different types.
Pulse shape: To display and analyze received signal's pulse shape, or to display oscillogram of the signal.
Jitter (option): Provides jitter processing functions: measurements and analysis of jitter in the received signal.
Measurements and graphical display of MTJ and JTF characteristics also jitter insertion in transmitted signal.
Configuration: To configure base hardware and software parameters.
Line interface
The “Line interface” menu contains main analyzer functional parameters. It is required to set up these parameters
before operation. The menu screen example is shown at Figure 5.2 below.
Mode
Select the operational mode from the following list:
Term: Terminal mode.
Tranz: Transit mode – Received signal is transmitted.
Monit: Monitoring mode.
Mon-Tr: Combined Transit-Monitor mode.
Frame structure
Select frame structure of tested dataflow:
PCM30: Set this mode if the tested system operates with the multiframe synchronization in TS16 (CAS).
PCM31: Select this mode if the tested system does not use multiframe synchronization in TS16.
Unstr: Select this if the tested system functions is without either frame or multiframe synchronization.
CRC-4
Figure 5.2: “Line interface” menu
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This function allows the analyzer to enable/disable CRC-4 error detection algorithm. Select one of the following
values:
On: If the function on the test set is able to measure CRC-4 errors in the received signal, and to send CRC-4 bits
in transmitted signal.
Off:CRC-4 processing function is disabled.
Inv: Invert CRC-4 bits.
Line code
Select the coding type between AMI and HDB3.
Transmitter synchronization
“Send sync” field allows the user to set the following parameters:
Rx: Synchronization from the Rx clock.
Intr: Synchronization from the internal clock.
Sync: Synchronization from E1 Sync clock.
Long haul
To turn On/Off the “Long haul” mode.
The “Long haul” mode is able to receive a signal level up to -36 dB.
If the mode is switched off then minimum level of received signal level is up to -18 dB.
Deviation
If the transmitter synchronization is set to “Intr” the value of the Deviation field provides the ability to switch on/off
deviation of the internal clock frequency. To specify deviation frequency use the function keys to adjust the value.
Test speed
This field allows the user to define the measured object (E1 path or a set of timeslots) for both receiver’s and
transmitter's ports. Move the cursor to the field's line and press ‘Enter’. A Select timeslots submenu (see
Figure 5.3) will appear on the screen.
To define measured object proceed as follows:
Figure 5.3: “Select timeslots” submenu
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1. Highlight a desired timeslot number with the cursor.
2. Press ‘Enter’ to invert current status of the timeslot. Any timeslot marked with “*” symbol will be included in
measured object.
3. Press ‘F1’ to select all the time slots.
4. Timeslots that is not valid for selection as a measured object will be highlighted with red color.
5. Press ‘F1’ to make both Receive and Transmit sections the same.
6. When measured object is selected press ‘F2’ to apply new settings. To move back to previous menu
without saving new object parameters, press ‘ESC.’
Protective resistors
The Protective resistor field provides the control for built-in protective resistors (470Ohms). These resistors are
used only in “Monitor” and “Transit-Monitor” operational modes.
If the field is set to “Off” value protective resistors are shunted.
Test pattern
This menu allows the user to set test pattern parameters and provides control for the test pattern sending. The
“Test pattern” screen is shown at the Figure 5.4 below.
Send pattern
The Send field allows to start/stop the insertion of current test pattern into timeslots selected in the “Line
interface/Test speed” menu.
Type
The Type field allows the user to select test pattern type from the following list:
All 1: All1
All 0: All 0
55: 55 Octet
2е6: Pseudo-random sequence
2е9: Pseudo-random sequence
2е11: Pseudo-random sequence
2е15: Pseudo-random sequence
2е23: Pseudo-random sequence
User: User-defined sequence
B
y
te 1, B
y
te 2, B
y
te 3
Figure 5.4: “Test pattern” menu
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The Byte 1, Byte 2, and Byte 3 fields allows user to define 24 bits of a user defined pattern.
To edit these fields, move the cursor to the desired bytes and press ‘Enter.’ The digits will be highlighted with
yellow color and use the function key to insert 0 (‘F1’) and 1 (‘F2’). Press ‘Enter’ to finish editing and save the
results. To cancel the edit result, press the ‘ESC.’
Invert RX
This parameter allows the user to invert the received test pattern.
Invert ТХ
This parameter allows the user to invert the transmitted test pattern.
Voice functions
The menu provides following functions:
1. Transmit audio data from the microphone into selected timeslot.
2. Transmit 1000 Hz signal into selected timeslot.
3. Measure signal frequency and level in selected timeslot.
4. Listen to the voice channel in selected timeslot via external headset.
5. Adjust microphone signal amplification.
6. Adjust headset telephone volume level.
7. Set up abcd signaling bits in CAS-bits field which is relevant to selected timeslot.
Voice functions measurements
TS Rx/Tx
This field displays numbers of timeslots selected for receiving/transmission signal respectively.
CAS Rx/Tx
The CAS Rx/Tx field shows signaling.
Frequency
This field shows the result of received signal frequency measurement.
Figure 5.5: “Voice functions measurements” menu
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Level
This field displays measured level of received signal.
Settings
Press ‘Enter’ to entering to “Voice function settings” submenu.
Voice function settings
This submenu defines the Voice processing parameters.
T/S send
The T/S send field allows user to specify timeslot into which audio information from selected source will be
transmitted.
Note: T/S selected in Line Interface menu for BERT measurement cannot be selected for voice testing.
Source
Select the source of transmitted audio data:
Off: Voice function is disabled.
Mic: Insert audio data from the microphone.
1 KHz: Insert harmonic 1000 Hz signal.
CAS
Figure 5.6: “Voice functions settings” menu
Figure 5.7: “T/S send” mode
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The CAS field specifies signaling group which will be inserted into CAS-bits field corresponding to the selected
timeslot.
Sensitivity
The Sensitivity parameter provides control for microphone signal amplification. To change the amplification, use
the ‘Enter’ key and left and right cursor to change the sensitivity.
T/S recv
The T/S recv parameter allows the user to select a timeslot to receive the voice data. Move the cursor to the field
and press ‘Enter.’ In appeared menu (see Figure 5.8) select required timeslot number and press button.
Note: T/S selected in Line Interface menu for BERT measurement cannot be selected for voice testing.
Telephone
The Phone field allows the user to switch on/off a headset telephone.
Volume
This field allows the user to adjust the telephone volume. Use the ‘Enter’ key and left and right cursor keys to
adjust the volume.
Measurements
The “Measurements” menu (see Figure 5.9) allows user to measure basic performance parameters for tested
path.
Figure 5.8: “T/S recv” submenu
Figure 5.9: “Measurements” menu
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G821/G826/M2100: Tested path parameters measurements in compliance with ITU-T G.821, G.826/M.2100
recommendation.
Propagation delay: Measure signal propagation delay for the tested channel.
G821/G826/M2100
To start/stop the measurement session, press ‘F1.’ When the measurements are active, the “M” symbol will
appear in the status bar.
This menu contains five screens:
Base parameters: To measure and analyze different type of errors and alarms.
G.821 parameters: To measure performance parameters according to ITU-T G.821 recommendation.
G.826/M.2100 parameters: Displays all parameters which could be measured in compliance with ITU-T G.826
and M.2100 recommendations.
To switch between screens use the cursor keys.
Figure 5.10: “Base parameters” menus
Figure 5.11: “G.821 parameters” menu
Figure 5.12: G.826/M.2100 parameters
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To save and load previously saved measurement results, user ‘F3’ and ‘F4’ key.
For most of the measured parameters the test set will display an accumulative counter (left column) and the
matching error rate (right column). For example the “CODE” parameter (a counter or code errors) is displayed in
left column; and compliant ratio value “CODER” is shown in the same line in the right column.
Propagation delay
This submenu allows user to measure a signal propagation delay.
Preliminary settings:
1. In Line Interface Test speed menu select the same measured objects for receiving and transmitting ports
(the timeslots quantity for both directions must be equal).
2. Stop or pause all currently performed measurements.
3. Stop or pause the errors insertion or alarms generation process.
Use button to start/stop propagation delay measurement.
The following values will be displayed:
Cur.: Current signal propagation delay value.
Min.: Minimum delay value registered during the measured session.
Max.: Maximum delay value registered during the measured session.
View data
The View data menu (see Figure 5.14) provides the ability to view contents of the received dataflow: frame or
timeslot contents; FAS/NFAS, CAS/MFAS words.
Figure 5.13: “Propagation delay” menu
Figure 5.14: “View data” menu
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