Combined T1, DS3, STS-1 SONET Tester

Contact Electrodata at 1-800-441-6336


Electrodata's TTS 3,EZ-TESTER® ST represents the most versatile T1, DS3, and STS-1 SONET transmission test set available. Equipped with the best test features and rugged design of the EZ-TESTER Series, the EZ-TESTER ST provides testing support for DS0, T1, DS3, and STS-1 SONET in a single hand-held unit. The EZ-TESTER ST is available in two basic configurations: STS-1 and DS3; and STS-1, DS3, and Single Line DS1 The portable set weighs three pounds, is housed in a rugged metal case, contains rechargeable batteries, and can be operated in temperatures from below 0° F to 140°F.


The EZ-TESTER ST is designed to perform in-service monitoring and in-service or out-of-service testing on DS1, DS3, and STS-1 communications equipment and circuits with a guided easy-to-use menu structure. The EZ-TESTER ST features a large liquid crystal display that can handle hot or sub-freezing temperatures, a water resistant front panel, a built in speaker, and plainly marked front panel LED's, all in a rugged metal case. The LCD screen presents setup options, test results, and configuration setup screen. The test set is equipped with an internal speaker and a 2.5 mm headset connection. An optional noise cancelling headset is available for placing calls and for use while testing in high noise environments. The EZ-TESTER ST comes with the standard industry test patterns built in, and user defined patterns are supported at each transport level. In addition, eight user defined test setups can be entered and are then available at the touch of a button.


This means that you can purchase the EZ-TESTER ST with basic STS-1 and DS3, and then add more capabilities as your testing requirements expand... without having to replace your unit or suffer expensive and complicated upgrade procedures. Most options are downloadable and only require a modem connection. Downloading is simple, using Electrodata's OnCall® feature built right into the test set. If a hardware upgrade is required, a same-day turn-around in the service center is easily scheduled. Currently, only the addition of MF, DS3 or STS-1 (options 08, 20 and 30 ) require hardware upgrades. Best of all, there is NO CHARGE for software updates to existing options and the basic operating system. Electrodata protects your investment and keeps your cost of ownership low, from the initial purchase through the foreseeable future.


The EZ-TESTER ST is available in two configurations and offers a wide range of options that can be ordered directly or added later as your testing needs expand. The basic instrument:
. STS and DS3
. STS and DS3, plus single line DS1

For any configuration with Single DS1, the following options can be added at an affordable price:

Fractional T1 (FT1) - (Option 01)

The Fractional T1 option provides the ability to test contiguous and noncontiguous 56 x N and 64 x N fractional T1 circuits and equipment.

ESF / SLC-96 Monitoring and Control - (Option 03)

This optional capability allows the monitoring and control of information in the Facility Datalink when ESF framing is used, or the SLC-96 datalink when SLC-96 framing is used. This includes the ability to detect or force PRMs, ASBs and alarms as well as far-end loop commands, maintenance messages and protection switch commands.

Performance Statistics Retrieval - (Option 04)

The EZ-TESTER ST provides an optional support capability for advanced Network Interface Units (NIUs) which gather performance data at a customer's premises. The EZ-TESTER can retrieve performance statistics and control these devices from an interface at the customer site, from a DSX location in the central office, or through a maintenance switch which supports a non-intrusive connection.

Addressable Repeater and Maintenance Switch Control - (Option 05)

Loopback and test procedures are greatly simplified when the Addressable Repeater and Maintenance Switch Control option is employed. Command and test sequences are accomplished using the EZ-TESTER ST's commands and its plain language interpretation of responses.

Dial / Supervision - (Option 06)

This option provides the necessary operations to originate or terminate a call into a digital switch or PBX from a DSX or other T1 access point. It also provides the ability to test Switched 56 services by establishing a data line through the public switched network to a test line or remote DSU/CSU. A user defined sequence of phone number plus access codes can be sent or captured along with signaling events such as a wink, off-hook or on-hook.

Computer Enhanced Testing (CET) - (Option 07)

The CET option expands the remote control capability of the EZ-TESTER and supports a user friendly environment for the PC user. Electrodata provides software, which operates within Windows®, to control an EZ-TESTER with the CET option.

MF Dial/Capture - (Option 08)

This hardware option supplements the Dial/Supervision option by enabling MF dial and digit capture with your EZ-Tester. This option must be installed at the factory.

Primary Rate ISDN - (Option 09)

This option is used to test Primary Rate ISDN circuits at the central office or at the customer location. It simulates the customer equipment and allows the placing and receiving of either data or voice calls. It will test 23B+D circuit configurations (or 23B+D and 24B with the use of a second test set).

Terminal Emulation - (Option 10)

This option allows the EZ-Tester to interact as a terminal with HDSL and PMDNI Digital Network Interface units both in the central office and in the field. The advantage to you is that a separate terminal or PC is not required to access the wealth of information and capability provided by the HDSL and PMDNI hardware. This option enables field technicians to obtain access this equipment without having to carry a separate terminal device.

DDS Channel Testing - (Option 11)

The DDS (Digital Data Service) Channel Testing option allows you to test DDS circuits and equipment from a T1 access point. This option offers full BERT capabilities using DDS-1 through DDS-6 stress patterns and 63, 127, 511 and 2047 pseudorandom patterns. It includes latching and non-latching loopback codes, and has the ability to detect and generate control codes. [Supports 2.4, 4.8, 9.6, 19.2, 38.4, 56, and 64 Kbps data rates.]

GR-303 Test Access - (Option 12)

The GR-303 Test Access option provides functions for testing loop access systems as described in Bellcore's GR-303-CORE, "IDLC Generic Requirements, Objectives, and Interface." Capabilities: Captures and displays Time-slot Management Channel (TMC) and Embedded Operations Channel (EOC) data; Filters on layer (2 and 3), CRV, and abnormal cause codes with both pre and post capture capability and timestamps captured messages; Displays raw and decoded hybrid signaling (ABCD) codes.

If Option 12 and Option 3 are both installed, GR-303 Test Access will include ESF performance statistics retrieval.

If Option 12 and Option 10 are both installed, GR-303 Test Access will provide craft interface access via the RS-232 port.

SS#7 Capture / Analysis - (Option 13)

The SS#7 Capture / Analysis option provides functions for analyzing Signaling System #7 common channel signaling as described in Bellcore's GR-246-CORE, "Bell Communications Research Specification of Signaling System Number 7" on 56K and 64K SS7 link channels. In the MSU Analysis mode, the test set captures and time-stamps Message Signaling Units (MSU) that appear on the SS7 link channel. Captured messages, selected by pre- and post-capture filtering, can be displayed in detail on an "expanded" screen to show the contents of all available message fields. In the SU/MSU mode, the test set provides running totals on two seperate screens of Signaling Units (SU) and MSUs appearing on the link. During the monitoring period, the test set counts the messages as they are detected and continuously increments a series of counters that show the results as totals, subtotals, and percentage of message types. The SU Analysis mode also displays the number of message re-transmissions by counting inverted Forward Indicator Bits (FIB) and Backward Indicator Bits (BIB).

Frame Relay Testing - (Option 14)

The Frame relay testing option adds basic test and analysis capabilities to the EZ-TESTER ST for verifying link functionality and connectivity on permanent virtual circuits (PVC). With this option installed, the test set can automatically poll the link to identify the protocol: FRF-LMI, ANSI T1.617-D, or ITU-T Q.993-A, and report the status of DLCIs. The test set will provide real time statistical data for all or individual DLICs such as total frames detected; number of frame errors; number of FECN, BECN, and DE frames; total octets; and DLCI throughput. This option also enables the test set to test connectivity by initiating and responding to IP PINGs.

Other options available for both the DS3/STS-1 and the DS3/STS-1/DS1 configuration are:

Far End Alarm and Control (FEAC) - (Option 21)

The FEAC option allows the test set to display far end alarm and status information via the FEAC channel and to transmit FEAC messages from the near end to test far end responses. The FEAC option also allows the test set to initiate DS3 loopbacks from a DS3 access point and DS1 loopbacks from a DS3 access point if Option 00 is installed.

STS-1 SONET with Byte-Sync VT1.5 - (Option 31)

This option adds byte-sync VT1.5 payload capability to the async VT1.5 capability provided with the STS-1 function of the basic instrument.


The Complete Package

The EZ-TESTER ST comes complete with a removable stand, neck strap, technical manual on CD, battery eliminator/charger, printer cable, and a padded carrying case with shoulder strap. The DS1 version also comes with two six-foot long Bantam-to-Bantam cables.  Both versions are covered by a standard one-year warranty.

To find out more about the EZ-TESTER ST, call toll-free 1-800-441-6336.


Specifications for the EZ-TESTER ST ®


    Electrical Interface        
        Connectors, RX, TX, EXT         WECO 440A Coaxial Jacks (shared with DS3 mode)  
        Impedance                       75 ohms ±5%
        Line Code                       B3ZS
                STSX-1                  Per TR-NWT-000253, 0.53 Vpk nominal, LBO=450 ft
                HIGH                    1.1 Vpk, LBO=none
                LOW                     0.2 Vpk, LBO = Flat loss
                STSX-1                  Automatic equalizer for 0 to 900 ft
                HIGH                    1.1 Vpk, nominal input
                LOW                     0.35 Vpk, nominal input, LBO=900 ft
                MON                     Up to 26 dB flat loss relative to nominal STSX-1

        Clock                           51.84 MHz
                Internal                ±5 ppm
                Loop                    ±300 ppm
                EXT                     ±300 ppm, TTL level
                BITS                    ±5 ppm, received DS1/VT1.5, T1 REF (Opt. 00 req'd)

    Transmitter and Receiver

        Framing                         STS-1
        Mapping to ANSI T1.105          DS3
                                        DS1 VT1.5 asynchronous (opt. 00 required)
                                        DS1 VT1.5 byte synchronous (opt. 00 and 31 req'd)

        VF Orderwire                    Section or Line on headset or internal speaker

        Error Insertion                 BPV, Frame, B1, B2, Line FEBE, B3, STS Path
                                        FEBE,VT1.5 BIP, VT1.5 FEBE, Pattern

                Rate                    Single, fixed rate or burst     

        Alarms                          LOS, LOF, AIS-L, RDI-L, LOP-L, AIS-P, RDI-P,
                                        LOP-V, AIS-V, RDI-V, PDI-V                                      

                Mode                    Single, Continuous      

        Pointer Adjustment              Increment/decrement and new pointer

        Transmit Source                 Looped from Receive, or Internal
                Payload                 Clear Channel
                                        Test Patterns:
                                                PRBS ( 215-1, 220-1, 223-1)
                                                1111, 1100, 1010, 1000, 0000
                                                Programmable byte

                                        DS1 inserted on single VT1.5
                                        Remaining: Broadcast, AIS, Looped, Unequipped


    Electrical Interface
        Connectors, RX, TX, EXT         WECO 440A Coaxial Jacks (shared with STS-1 mode)        
        Impedance                       75 ohms ±5%
        Line Code                       B3ZS    
                DSX                     Per TR-TSY-000499, 0.39 Vpk nominal, LBO=450 ft
                HIGH                    0.9 Vpk, LBO=none       
                LOW                     0.2 Vpk, LBO = Flat loss        
                DSX                     Automatic equalizer for 0 to 900 ft
                HIGH                    0.9 Vpk, nominal input  
                LOW                     0.2 Vpk, nominal input, LBO=900 ft      
                MON                     Up to 26 dB flat loss relative to nominal DSX
        Clock                           44.736 MHz
                Internal                ±5 ppm  
                Loop                    ±300 ppm        
                EXT                     ±300 ppm, TTL level

   Transmitter and Receiver

        Framing                         Unframed, M13, C-bit Parity     
        Error Insertion                 BPV, Frame, C-bit, P-bit parity, FEBE, Pattern  
                Rate                    single, fixed rate or burst     

        Alarms                          LOS, LOF, Yellow, AIS, Idle, DS2 LOF, DS2 AIS, DS2 Yellow       

                Mode                    Single, Continuous      

        Transmit Source                 Looped from Receive, or Internal        
                Payload                 Clear Channel
                                        Test Patterns:
                                                PRBS ( 215-1, 220-1, 223-1)
                                                1111, 1100, 1010, 1000, 0000
                                                User Programmable up to 24 bits
                                        DS1 Inserted on single channel
                                        Remaining: Broadcast, AIS, Looped

        FEAC                            per ANSI FEAC proposal


    Electrical Interface
        Connectors, RX, TX, REF         Bantam Jacks

        Pulse Shape:                    Conforms to TR-TSY-000499, ITU Recommendation
                                        G.703; AT&T Publications CB113, CB119, CB132,
                                        CB143, PUB62508, and PUB62411 pulse shape
                                        specifications when terminated in 100 ohms
                                        and 0 LBO is selected
        Line Code                       AMI, B8ZS
        Line Build Out                  0 dB, -7.5 dB, -15 dB
                Terminate               DSX +6 dB to DSX -36 dB, 100 ohms
                Monitor                 DSX -14 dB to DSX -40 dB, 100 ohms
                Bridge                  DSX +6 dB to DSX -36 dB, >1000 ohms

        Clock                           1.544 MHz
                Internal                ±5 ppm  
                External                ±300 ppm        
                Recovered               ±300 ppm

    Transmitter and Receiver

        Framing                         Unframed, D3/D4, ESF, & SLC96*

        Channel Formats                 56x1, 64x1, Fractional T1 (56xN, 64xN) (opt. 01 required)       

        Test Patterns                   2047, 2E15-1, 2E20-1, 2E23-1, QRSS, Bridge,
                                        Multiple, All 0's, 1:7, 2 in 8, 3 in 24, Alt 1/0,
                                        All 1's, T1-1, T1-2, T1-3, T1-4,  T1-5, 55 Octet,
                                        T1-Daly, DDS-1, DDS-2, DDS-3, DDS-4, DDS-5,
                                        DDS-6, User defined patterns up to 2048 bits

        Error Injection 
                Type                    BPV, Frame, CRC, Pattern                        
                Error Rate              Single, Fixed Rate, Burst

        Alarms                          LOS, LOF, Yellow, AIS, Idle     


        VF In/Out Connector             2.5mm Headset Jack


    ESF T1.403 Performance Report Messages (ANSI STANDARD)
        Send Functions
           Operating Mode               Live, Fixed, or Unscheduled     
                PRM Selections

                        CRC Errors      No errors, 1 error, >1 to 5 errors, >5 to 10 errors,
                                        >10 to 100 errors, >100  319 errors,  320 errors

                        Application Specific Bits:
                                LB      Payload Loopback Active
                                SL      Controlled Slip  1
                                LV      Line Code Violation
                                FE      Framing Bit Error       
                                SE      Severely Errored Framing Bit Event
                Unscheduled Messages    Any, including Yellow Alarms

        Receive Functions               CRC Events, ASB Status, Unscheduled, Errored Seconds,
                                        Severely Errored Seconds, Message Errors, Elapsed Time

    SLC-96 Datalink Control and

        Send Functions (Alarm and Maintenance Messages)

                Alarms                  Major, Minor, Power/Miscellaneous
                Shelf Alarms            A, B, C, and D
                Far-End Loopbacks       A, B, C, D, and P
                Maintenance Messages    Idle, On-Hook/Seize, Proceed, Test Alarm        
                Protection Messages     Idle, Line A RX, Line B TX, Line C TX, Line D TX,
                                        Line B TX/RX, Line C TX/RX, Line D TX/RX

        Receive Functions (Display decoded messages)

                                        Alarms (Major, Minor, Power, Miscellaneous),
                                        Shelf Alarms, Far-End Loopback, Maintenance Messages,
                                        Protection Messages, Concentrator Messages (SLC 96 II)

PM TEST ACCESS (Option 04)

    Operations                          Retrieve PM statistics, Clear PM Statistics,
                                        Set PM Clock


    Device Type                         CSU, NIU, Repeater and Maintenance Switch
                                        (Requires Option 05)    

    User-Defined Loopback Codes         Stores up to 8 with alphanumeric labels

    (Intelligent T1 span devices)       (Contact factory for current list)


    Trunk Types                         E&M, Ground start, Loop start

    Emulation                           FXS, FXO, SLC Station/Office

    Dialing Mode                        Autodialing (up to 30 characters entered
                                        manually and outpulsed automatically

    Types of Dialing                    Pulse and DTMF (MF with opt. 08)

    Dial Sequence                       Up to 30 digits

        Store Telephone Numbers in Memory
            Number of memory files      8
            Length (Each number)        Up to 30 digits
            Alphanumeric Labels         
            (Each file)                 Up to 12 alphanumeric characters

        Channel Supervision             On/Off Hook and Ringing

        Capture/Display Dialed Digits
        (Pulsed/DTMF)                   Up to 30 digits

        Wink                            Send momentary Off Hook signal
        Wink Measurements               Wink delay and duration of wink 

        Echo Disable                    Send 2100 Hz tone for 3 sec's to disable
                                        echo cancellors

        CCITT V.5554 DSU/CSU
            Loopdown Codes              Code sent for 4 minutes


    D-Channel                           Selectable

    Loop-Back                           Supports simultaneous call placement and receipt
                                        to provide a loopback for voice or BERT testing

    Interface Type                      23B + D, NFASS                                  

    Call Type                           Voice Call
                                        Data Call
                                           56 Kbit/s
                                           64 Kbit/s
                                           N x 64 Kbit/s (opt. 01 required)
                                           H0 - 6 B-channels or 384 Kbit/s (Option 01 req'd.)
                                           H11 - 24 B-channels or 1.536 Mbit/s

    Call Control                        AT&T, Northern Telecom, National ISDN-2

    Dial Sequence                       Up to 30 digits

    Store Telephone Numbers in Memory
            Number of memory files      8
            Length (Each number)        Up to 30 digits
            Alphanumeric Labels         
            (Each file)                 Up to 12 alphanumeric characters

    Transaction Display                 Cause Value, Layer 2 Status, Call State

        Patterns                        All 0's, All 1's, 1:7, 2 in 8, 2047, 2E15-1, QRSS,
                                        55 Octet

        Results                         BPV Errors, BIT Errors, Frame Errors, CRC Errors,
                                        Elapsed time

    Voice Channel Data                  Digital Milliwatt, Idle Code, Headset,
                                        DTMF entry through touchpad

    Status Display                      Layer 2 Status, Call State, Cause Value
                                        (Both numeric and plain language)

    Programmable Options                Network Options, Facility Options, Calling Numbers


    Interface Type                      RS-232 25-pin to 9-pin interconnect cable supplied

    Display                             LCD screen of 32 characters by 20 lines
                                        Virtual display of 80 characters by 24 lines
    Emulation                           Auto, VT100, ASCII

    Responses                           Standard character responses are provided

    Equipment Supported                 Adtran, Inc.
                                            HDSL Central Office Customer Premises Unit
                                            Models:     HTU-R, T400HTU-R, HFAC
                                        PairGain Technologies, Inc.
                                            HDSL Central Office and Customer Premises Unit
                                            Models:HLU-231, 319, 388, 611, 612, D41;
                                                HRU-412, 512; HLIU-960; HDU-451
                                        Teltrend, Inc.
                                            PMDNI Digital Network Interface


    DS0-A Channel Rates                 2.4, 4.8, 9.6, 19.2, 38.4, 56, and 64 Kbps

        (Latching and alternating)      Channel, DSU, OCU, DS0-DP, NIE, 8-bit user defined

    Control Codes                       Repeater Release, Idle, Abnormal Station,
                                        Mux-Out-of-Sync, Unassigned MUX Channel,
                                        Test Code, Test Alert, MJU Alert, Loopback Enable,
                                        Far-End-Voice, Transition in Progress, Block Code,
                                        Release Code, MAP0 Code, MAP1 Code,
                                        Eight-bit user defined

    BERT Patterns                       63, 127, 511, 2047, 2E15-1, 2E20-1, QRSS, All 0's,
                                        1:7, 2 in 8, 3 in 24, Alt 1/0, All 1's, T1-1, T1-2,
                                        T1-3, T1-4,  T1-5, 55 Octet, T1-Daly, DDS-1, DDS-2,
                                        DDS-3, DDS-4, DDS-5, DDS-6, User defined patterns
                                        up to 2048 bits 

    BERT Results                        BPV, Bit, Frame, CRC Errors, Elapsed Time


   Print Functions                      Last Results, Captured Events, Current Setup,
                                        User Setups, User Test Patterns, Captured Channel Data,
                                        Retrieved PM Data

        Captured Events
            Types of Events
            (Input Signal)              Alarm changes, Errored Second, Severely Errored Second,
                                        DS1 Frame Slip

            Number of Events            100 to 1500 (Depending on type of event)
            Event Triggers              Automatic, Selectable, Manual

    Printer Interface                   See AUXILIARY PORT      


    Function                            RS-232 Interface/Remote Control or Printer      

    Printer Width                       80 columns      

    Connector                           25-pin D female

    Type of Interface                   DTE or DCE

    Transmission Speeds                 1200, 2400,9600,14.4K, 19.2K, 28.8K

    Bits per Character                  7 or 8

    Parity                              Odd, Even, or None

    Stop Bits                           1 or 2


    Batteries                           Rechargeable nickel metal hydride (NiMH)
        Battery Life                    Basic unit - 4 hours/charge

    AC Operation                        100 - 240 VAC, 50/60 Hz (PS-6)


    Size                                10.2"L x 3.8"W x 3"H

    Weight                              3 lbs. (1.35 kilograms)

    Display Screen                      Backlit LCD, 24 lines x 32 characters

    Operating Temperature               -20° C to +60° C

    Storage Temperature                 -30° to + 90° C

    Humidity                            10% to 90% non-condensing

Specifications subject to change without notice.
*SLC is a registered trademark of AT&T.


Electrodata Inc., P.O. Box 31780, Independence, OH 44131-0780
E-Mail: sales@electrodata.com Phone: (216)663-3333 or (800)441-6336 Fax: (440)374-4994