TX50e e-Manual
3.1.2 LED indicators description
3.2 Specifications of the
analyzer's components
5.2.5 Transmitter synchronization
5.4.1 Voice functions measurements
5.7.4 Start/stop errors insertion
5.7.7 Start/stop alarms generating
5.9.2 Maximum Tolerable Jitter
5.9.3 Jitter Transfer Function
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)
Interface |
G.703 |
Connector |
RJ-45,
banana or BNC |
Rate |
2.048
Mbit/s |
Impedance |
120
Ω balance or 75 Ω unbalance |
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
Ω balance or 75 Ω unbalance |
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 |
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 |
|
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 |
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 |
|
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 |
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) |
LEDs on TX50e’s front
panel display following receiver conditions:
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 |
Software
update |
USB |
External
power |
Input
100-240V AC, 50/60 Hz |
|
Output 9V
@ 0.8 A |
|
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 |
Front panel is made up of
color LCD display, keyboard, and a row of three-color LEDs indications
(see Figure 3.1).
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.
320
x 240 pixels, backlight color LCD.
15
button keyboard.
To
switch the instrument on/off press the power button and hold it for 1-2
seconds.
Power
External power supply:
ž
No
indication – no external power supply connected.
ž
Green
– external power supply is connected.
ž
Green/Yellow
(blinking) – internal battery is charging.
SIG
Signal Presence:
ž
Green
– signal detected.
ž
Red
– loss of signal at the moment.
ž
Yellow
– since reset, loss of signal has been registered at least once.
AIS
Alarm Indication Signal (all 1):
ž
Green
– no AIS alarm has been registered since reset.
ž
Red
– AIS alarm at the moment.
ž
Yellow
– since reset, AIS alarm has been registered at least once.
FRM
Frame Alignment Detected:
ž
Green
– frame is synchronized.
ž
Red
– loss of frame synchronization at the moment.
ž
Yellow
– since reset, loss of frame synchronization has been registered.
MFR
Multiframe Alignment Detected:
ž
Green
– multiframe is synchronized.
ž
Red
– loss of multiframe synchronization at the moment.
ž
Yellow
– since reset, loss of multiframe synchronization has been registered.
RDI
Remote Defect Indication:
ž
Green
– no RDI detected.
ž
Red
– RDI detected at the moment (bit A=1 in NFAS).
ž
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:
ž
Green–
normal operation since reset.
ž
Red–
SES at the moment.
ž
Yellow–
since reset, at least one severely errored second has been registered.
RMA
Multiframe Remote Alarm
Indicator:
ž
Green–
no RMA detected.
ž
Red–
RMA alarm at the moment.
ž
Yellow–
normal operation, but since reset, RMA has been registered.
PAT
Pattern Synchronization and Loss:
ž
Green–
test pattern detected.
ž
Red–
loss of test sequence synchronization at the moment.
ž
Yellow–
since reset, loss of pattern synchronization signal has been registered.
Any of described LED
indicators (except the SIG indicator); will not lit if a corresponding event is
not analyzed.
This
button provides following actions:
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.
The USB cable provides the
connection of the test set to a PC. Description of the cable's connector pins
is shown in the table 3.2 below.
Signal |
PC |
|
1 |
+5V |
1 |
2 |
D- |
2 |
3 |
D+ |
3 |
4 |
GND |
4 |
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.
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 pattern: Test pattern parameters settings.
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.
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.
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.
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.
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. šššššššššššššššš
Select the coding type
between AMI and HDB3.
“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.
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.
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.
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:
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.
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.
The Send field allows to start/stop
the insertion of current test pattern into timeslots selected in the “Line
interface/Test speed” menu.
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
2Å6: Pseudo-random sequence
2Å9: Pseudo-random sequence
2Å11: Pseudo-random sequence
2Å15: Pseudo-random sequence
2Å23: Pseudo-random sequence
User: User-defined sequence
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.’š
This parameter allows the
user to invert the received test pattern.
This parameter allows the
user to invert the transmitted test pattern.
The menu provides following
functions:
|
Figure 5.5: “Voice functions
measurements” menu |
This field displays numbers
of timeslots selected for receiving/transmission signal respectively.
The CAS Rx/Tx field shows
signaling.
This field shows the result
of received signal frequency measurement.
This field displays
measured level of received signal.
Press ‘Enter’
to entering to “Voice function settings” submenu.
This submenu defines the
Voice processing parameters.
The T/S send field allows user to
specify timeslot into which audio information from selected source will be
transmitted.
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.
The CAS field specifies signaling
group which will be inserted into CAS-bits field corresponding to the selected
timeslot.
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.
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.
The Phone field allows the user to
switch on/off a headset telephone.
This field allows the user to
adjust the telephone volume. Use the ‘Enter’ key and left and right
cursor keys to adjust the volume.
The
“Measurements” menu (see Figure 5.9)
allows user to measure basic performance parameters for tested path.
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.
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.
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.
This submenu allows user to
measure a signal propagation delay.
Preliminary settings:
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.
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.
View contents of FAS/NFAS
words in last sixteen frames (see Figure 5.16).
Use ‘F1’ to
start/stop data update process.
Use ‘F2’ to switch
between FAS/NFAS and S-bits screens.
The CAS/MFAS submenu (Figure 5.16) provides the ability to view the contents of
CAS/MFAS words in last sixteen frames.
Use ‘F1’ to
start/stop data update process.
Use ‘F2’ to
switch between CAS and MFAS contents display screens.
The Frame monitoring submenu (see
Figure 5.17) allows user to view frames
content. To switch between frame contents screens use the cursor to move up and
down.
Use ‘F1’ to
start/stop displayed data update process.
The Insert errors menu (see
Figure 5.18) provides the ability to insert
errors or generate alarms of different types.
The Error type field allows the user to select the following type of
error:
Bit: Generate bit errors
E-bit: Generate bit errors in PRBS
FAS: Generate errors in a FAS word
MFAS: Generate errors in a MFAS word
CRC: Generate CRC error
REBE: Generate REBE errors
CODE: Generate Coding Violation
The Speed field provides the
ability to set up errors insertion rate.
Select number of errors to
insert from the following: Cont– continuous errors as set in speed insertion: 1, 10, 100, 500, 1000, and
5000.
The Errors field allows the user to
control the process of errors insertion.
The Alarm type field allows the user to select type of alarm to be
generated.
LOS: Loss of Signal.š
AIS: Alarm Indication Signal. The transmitter
will send all ones.
LOF: Transmit loss of FRM synchronizing
signal.
LOM: Transmit loss of multiframe
synchronization in TS16 (loss of MFAS multiframe synchronizing signal (ITU-T
G.704, sub clause 5.1.3.2)).
RDI: Remote Defect Indication (ITU-T
G.706). The test set transmits “1” in every third bit of the
timeslot in zero frame which does not contain frame synchronization signal. The
FAS DISTANT alarm signal could be transmitted only in PCM-30 and PCM-31
systems.
RMA: Remote Multiframe Alarm (ITU-T
G.732). The analyzer transmits “1” in every sixth bit of the
timeslot in zero frame TS16. The MFAS DISTANT alarm signal could be transmitted
only in PCM-30 systems.
LSS: Test Pattern synchronization loss.
ARTF: Transmission of unstructured
alternating 1s and 0s.
The Time field allows the user to
select a duration of the alarm generating process:
0.1: 0.1 second
0.5: 0.5 second
1: 1 second
2: 2 seconds
5: 5 seconds
Cont.: Continuous generation.
The Alarm field allows the user to
control the process of alarms generating.
This menu provides the
ability to display and analyze the pulses produced by E1 equipment. The pulse
height and overall shape are displayed against the ITU-T pulse mask conformance
template.
Test set will automatically
display the single pulse against the ITU-T G.703 pulse shape mask.
Press ‘F1’ to
update the screen.
Press ‘F2’ to
move to the Oscilloscope screen.
This is an optional
function, it provides the ability to display a one-shot sample of the signal
for the 4 interval with the frequency passband of 0.01… 10 MHz.
An example oscillogram is
shown on the figure below. Horizontal grid step is 250 ns; vertical grid step
is displayed in upper left corner of the screen.
Press ‘F1’ to
update displayed information.
Press ‘F2’ to
switch back to the Pulse shape screen.
This optional menu provides
the following jitter processing functions:
Jitter measurements: Measurements and analysis of
jitter in received signal.
Maximum Tolerable Jitter: Measure maximum tolerable jitter
(MTJ) according to ITU-T G.823 recommendation.
Jitter transfer function: Measure JTF characteristic.
Jitter generation: Generate harmonic jitter of
user-defined level and frequency.
The Jitter
measurements submenu allows the user to measure and analyze received
signal jitter. The measurements example is shown at Figure 5.23 (the vertical grid spacing is 0.5 UIpp).
Press ‘F1’ to
start measurements.
Press ‘F2’ to
reset the screen.
To select the HP1+LP (20
Hz… 100 kHz) or HP2+LP (18 kHz...100 kHz) filter, press ‘F4.’
This menu allows user to
measure and analyze the MTJ characteristic (ITU-T G.823) for a tested path.
Required
measurement criteria:
The measurements result is
an MTJ characteristic diagram. Horizontal axis corresponds to frequencies range
of 20Hz... 100kHz; vertical axis– to generated jitter amplitude.
Press ‘F1’ to
start/stop the measurement.
Colors on the graphical diagram
denote the following:
White: White line displays the MTJ mask
according to ITU-T G.823 recommendation.
Green: Range of jitter values which are
valid for tested path.
Red: Range of jitter values which are
not valid for tested path.
Magenta: Range of values which are not
available for generating.
To analyze JTF
characteristic, relevant to MTJ mask jitter (see ITU-T G.823 recommendation,
Figure G.823/13) is inserted into a specified channel and, then the received signal
jitter value is measured.
JTF calculation formula:
It is necessary to perform a calibration to increase the results accuracy.
The calibration must be
performed in following cases:
Calibration result is shown
at figure below.
The Jitter generation submenu provides the ability to insert a
harmonic jitter of user-defined frequency and peak-to-peak amplitude into a
signal transmitted by the analyzer.
In case of jitter
generation, the “Sync” parameter in the “Line
interface” menu must be set to “Intr”
value.
Following functional
buttons are used to configure jitter parameters:
Press ‘F1’ to
start/stop the generating process.
The “Jitter
generation” submenu shows following parameters:
Transmit
Generated
jitter parameters:
Frequency – Transmitted jitter frequency (20Hz... 100
kHz).
Level – Maximum peak-to-peak jitter (UIpp).
Receive
Current jitter value received signal.
The Configuration
menu (see Figure 5.26) provides the
ability to configure analyzer's basic parameters, line interface parameters.
To view information about software
versions, press button.
The Basic settings submenu screen
is shown at Figure 5.27.
This submenu allows the
user to set up following parameters:
Time: Current time
Date: Current date
Meas. time: Measurement session duration. This
parameter allows the user to define the period for automatic measure stop. To
disable this function set the measurement time value to 00:00 (HH : MM).
Beep alarms: To turn on/off the beep alarm.
Auto power off: Automatic power off modes is
depended on several criterions:
š
Off: Function is disabled.
Type 1: Test set will automatically power
off if the test set did not have any active measurement for test pattern and alarm
generation for 10 minutes.
Type 2: Test set will switch off if the
test set does not have an active measurement at the moment for 10 minutes.
Type 3: The test set will switch off if
the test set was idle for 10 minutes and no key has been pressed.
LCD auto off: Automatically switch off the LCD
to conserve battery power.
Language: English.
The Line interface submenu screen
is shown at Figure 5.28.
This submenu contains the
following fields:
Ch value: Silence code content is inserted
in every free of transmission timeslot.
Coding: Select the coding law (A-law or
-law).
Elastic buf: Setting size of the elastic buffer
used at measurement of parameters Clock Slip: CLSLIP+ and CLSLIP-.
The
elastic buffer with frequency of the signal receives the port Sync, and with
frequency of the signal receives on port Rx. At overflow of the elastic buffer
the device registering negative slippage CLSLIP-; at a devastation of the
buffer --positive slippage CLSLIP+.
If
parameter “Elastic buf” is setting in
“Off”, measurement of parameters CLSLIP+ and CLSLIP- not making.
At a choice of the menu Calibration mode opens the menu shown on
figure 5.29.
Warranty Period: The warranty period for hardware, software and firmware are one (1) years from the date of shipment to the customer.
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Software Coverage: VeEX Inc warrants software and firmware materials against defects in materials and workmanship. During the warranty period, VeEX will, at its sole discretion, either
provided that the products that the customer elects to replace is returned to VeEX Inc by the customer along with proof of purchase within thirty (30) days of the request by the customer, freight prepaid.
Additionally, during the warranty period, VeEX Inc will provide, without charge to the customer, all fixes, patches and enhancements to the purchased software, firmware and software options. VeEX Inc does not warrant that all software or firmware defects will be corrected. New enhancements attached to a software option require the option to be purchased (at the time of order or the time of upgrade) in order to benefit from such enhancements.
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