AALogic ST-101 User manual

ST-101 Signal Transmitter
Fault Location Transmitter
User Manual
Version 1.0.2

Allied Analogic. Inc.
132 Redtail Ct.
Weatherford, TX 76088
[phone]
© 2017, AALogic Inc., All rights reserved

Version 1.0.2 i
Table of Contents
1 General Description ..............................................................................................................................1
1.1 Features ........................................................................................................................................ 1
1.2 How Fault Locating Works ............................................................................................................1
2 What is included ...................................................................................................................................1
3 Front Panel............................................................................................................................................ 2
4 Display...................................................................................................................................................3
5 Before First Use..................................................................................................................................... 3
5.1 Battery Charging ........................................................................................................................... 3
5.2 Configuration Options...................................................................................................................4
5.2.1 Display Setup –Contrast and Backlite .................................................................................. 4
5.2.2 Tone Configurations..............................................................................................................4
6 Setup ..................................................................................................................................................... 4
6.1 Safety ............................................................................................................................................ 4
6.2 Fault Pre-Testing ...........................................................................................................................4
6.3 Sectioning......................................................................................................................................5
6.4 Connections ..................................................................................................................................5
6.5 Split Faults.....................................................................................................................................5
7 Transmitting Signals.............................................................................................................................. 6
7.1 Frequency selection ...................................................................................................................... 6
7.2 AUTO-SET ...................................................................................................................................... 7
7.3 Manual Transmitting..................................................................................................................... 7
7.4 Output Errors ................................................................................................................................8
7.4.1 Low Current –High Resistance or Open ...............................................................................8
7.4.2 High Current –Short, Cross, or Ground ................................................................................9
7.4.3 AUTO-SET High Current Error ...............................................................................................9
8 Specifications: .....................................................................................................................................11
9 ST-101 Quick Reference......................................................................................................................13
9.1 Setup ...........................................................................................................................................13
9.2 AUTO-SET ....................................................................................................................................13
9.3 Manual Mode.............................................................................................................................. 13

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1GENERAL DESCRIPTION
The ST-101 Signal Transmitter is a signal transmitter used to transmit signals on twisted pair telephone lines for
locating resistive faults when used with a receiver such as the AALogic SR-101.
1.1 FEATURES
The features of the ST-101 Signal Transmitter include:
Five frequencies: 335Hz, 577Hz, 987Hz, 2KHz, and 4KHz.
Simple user interface and operation.
Rechargeable internal battery
Water resistant, lockable case
1.2 HOW FAULT LOCATING WORKS
The ST-101 helps locate faults by transmitting a signal on a pair with a resistive fault. The technician uses a
signal receiver, such as the AALogic SR-101, to trace the signal on the cable. The current flowing in the
pair causes the signal to be radiated. The highly sensitive receiver, tuned to the same frequency as the
transmitted signal, allows the technician to locate the fault by observing the changes in the signal
strength. The signal significantly increases or decreases as the technician moves past the fault.
The ST-101 offers a high voltage, low current signal that is compatible with receivers capable of
monitoring one of the five signal frequencies.
This manual describes the setup of the transmitter for the various faults to be located. It is important that
the technician setup the system as described to obtain reliable results. In all cases, a complete circuit,
through the fault, is required.
The receiver operating instructions must also be used for effective location of faults.
2WHAT IS INCLUDED
The ST-101 includes the following:
ST-101 Signal Transmitter
Test cord with clips
Charger
USB Drive with manual

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3FRONT PANEL
The ST-101 main display is shown in the following picture.
The PWR/CLR on the lower left is used to Exit any screen or to turn the unit off.
Keys F1, F2, and F3 are screen dependent.
oThe F1 START key starts sending a signal at the currently set frequency.
oThe AUTO-SET key initiates an automatic setup feature. The ST-101 will scan the pair and
attempt to determine an optimum frequency and initial power LEVEL.
The FREQ key allows for frequency selection.
The LEVEL key is used to adjust the power output LEVEL when transmitting the signal.
The CFG key allows the user to set the CONTRAST, BACKLITE, and TONE mode options.
The Charger jack (12V) is used to charge the internal battery. Only use the supplied charger to
charge the ST-101 to avoid damage to the unit.
The CHGR lights above the display has a red light when the charger is connected. A green light is on
when the battery is charging.
The pair cord plugs in on the right side of the case as indicated on the front panel.

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4DISPLAY
The Main screen is shown in the following picture.
From this screen, the F1 key is labelled START. This begins the transmitting operation using the current
frequency shown on the screen and automatically adjusts the power output. The F2 is not used from the Main
screen. The F3 key is labelled AUTO-SET and begins the transmitting operation and automatically adjusts the
frequency and the power output.
The display is backlight and contrast adjustable by pressing the CFG key.
A battery charge indicator is in the top left corner. Always check this before use. If only one segment is shown,
charge the unit as soon as practical.
5BEFORE FIRST USE
5.1 BATTERY CHARGING
The ST-101 should be charged before the first use. Use only the supplied power supply with the ST-101.
AALogic recommends charging a minimum of four hours before the first use. In normal operation, the ST-
101 should be fully charged after two to three hours depending on the current charge level.
Battery Charge
Indicator
Currently Selected
Frequency

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5.2 CONFIGURATION OPTIONS
This section describes the configuration options for the ST-101.
5.2.1 Display Setup –Contrast and Backlite
Press the CFG key to adjust the display for personal preferences. The Contrast and Backlite LEVELs can
both be adjusted. It may be easier to increase the Backlite to a comfortable LEVEL first and then adjust
the Contrast.
5.2.2 Tone Configurations
The ST-101 has two tone modes, SOLID and Pulsed, selected from the CFG screen. The SOLID tone should
be used in most cases. The pulsed mode provides an ON/OFF/ON tone that may be useful when more
than one cable appears to have tone. The SOLID mode may be easier to use once the proper cable has
been identified. Some receivers may not display the pulsed tone as well when locating a fault.
6SETUP
The ST-101 is designed to simplify setup. The directions provided with the receiver should be reviewed to
ensure the best success in locating the fault.
6.1 SAFETY
All prescribed safety precautions and procedures must be observed while using the ST-101. Failure to do so can result in serious injury or
death.
Caution should be used when foreign voltage is detected on a pair. The voltage may be a power source capable
of injury to technicians and possible damage to equipment. Foreign voltage should be removed prior to locating
for best results.
6.2 FAULT PRE-TESTING
The technician must identify the type of fault before attempting location. The ST-101 connection and receiver
indication vary depending on the type of fault. Pair test equipment, such as the AALogic D-105, ATV-25, or
similar test sets, may be used to identify the type of fault on the pair.

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The approximate location of the Fault should also be estimated by the pair test equipment. The estimate and
the cable documentation are useful in sectioning the cable for Fault location. The physical location and the
location provided by electrical measurements may not agree.
6.3 SECTIONING
The fault should be isolated to as small a cable section as practical prior to attempting fault location. This will
improve the reliability of the fault indications and reduce the time needed to locate the fault. Existing practice
should be followed for sectioning.
The faulted pair being located should be isolated from the CO and any terminating (premise) equipment during
the location.
6.4 CONNECTIONS
The ST-101 includes a cord with pair clips. This cord is plugged into the jack on the right side. Only the pair cord
supplied with the ST-101 should be used.
Fault location depends on current flow. The black and red clips must be connected to each side of a resistive
fault as follows:
Fault
Description
Connections
Short
Tip connected to Ring
Black to Tip and Red to Ring
Ground
Tip or Ring connected shield
Black to sheath and Red to grounded wire
Cross
Tip or Ring of one pair is connected to the Tip or
Ring of another pair
Black to one of the crossed wires and Red to the
other crossed wire.
Split
Tip or Ring of one pair is split with the Tip or Ring
of another pair
Black to Tip of one of the split pairs and Red to
the Ring of the same pair. See 6.5 below.
6.5 SPLIT FAULTS
During identification of the split, the technician must identify the two pairs involved in the split and if the tips or
rings are split. The diagram below shows a split and how to place temporary short at the end of the section.
Locating a Split
TIP
RING
R
TTIP
RING
R
T
TIP
RING
R
TTIP
RING
R
T
Pair 1
Pair 2
TIP
RING
R
T
TIP
RING
R
T
Pair 1
Pair 2
Temporary
Short
Locating a Split
TIP
RING
R
T
TIP
RING
R
T
Pair 1
Pair 2
Temporary
Short
Locating a Split
TIP
RING
R
TTIP
RING
R
T
TIP
RING
R
TTIP
RING
R
T
Pair 1
Pair 2
TIP
RING
R
T
TIP
RING
R
T
Pair 1
Pair 2
Temporary
Short
Locating a Split
TIP
RING
R
T
TIP
RING
R
T
Pair 1
Pair 2
Temporary
Short

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7TRANSMITTING SIGNALS
The ST-101 allows the technician to preselect a frequency to transmit by pressing the FREQ key. A suggested
cable length is displayed for each frequency. Higher or lower frequencies may work better than the suggested
frequency in some cases.
7.1 FREQUENCY SELECTION
Pressing the FREQ key allows the user to select a specific frequency. The ST-101 displays the
recommended distance for each frequency. The table below shows the recommendations and notes.
Section Length
Frequency
Note
100 to 2000 feet
4 KHz
Higher frequencies may be
detected past the Fault in some
cases.
1-3 kFt
2 KHz
2-5 kFt
987 Hz
Some pair identification probes are
compatible with this frequency.
3-6 kFt
577 Hz
This tone is compatible with
standard tone probes for pair
identification.