Micro Seven Inc.® model LS15-N for developing caller-ID for Japanese market

copyrights Micro Seven, Inc.®, 2010, 2011, 2012, 2013


Micro Seven Model LS15-N, Telephone Line Simulator, provides simulated CO functions in Japan. The LS15-N contains unique call progress tones, 16Hz sine wave ring signal, programmable loop voltage, short primary or programmable secondary telephone number and caller-ID generation for NTT standards. The LS15-N also contains line-impairment mode with extra insertion losses and random noise added for long-distance telephone lines. The programmable parameters include caller’s telephone numbers, privacy/out-of-area, date and time, and battery voltage of 20 or 40V. All the programmable parameters are restored back after the power to LS15-N is turned. The LS15-N may also be operated by an external DC source with Car Battery Adapter.  A carrying case, Car Battery Adapter, and 220V version of AC/DC adapter are available as options. The LS15-N is also equipped with a forced-disconnect feature where disconnect signals are sent to calling and called lines. The duration of disconnect signal is also programmable. Programmable network response delay simulates time delay after completion of dialing. Simulated PBX mode returns dial tone after dialing 9. The secondary call progress tone generates a single-frequency tone instead of dual-frequency call progress tone. RS232 serial interface option is included.







MICRO SEVEN-Model LS15-N, 2-line telephone line simulator with Japanese caller-ID standard


i Small, 4" x 1.75" x 7.5"
i For use in Japan and USA
i Low cost, and portable
i DTMF or special rotary pulse dialing input
i Primary or secondary (programmable to 18 digit) telephone number
i 16Hz 75VRMS Sine-wave ring signal, 1 sec on/2 sec off
i Compatible with NTT Number Display receivers
i RS232C interface to program telephone numbers and caller-ID parameters
i RS232C interface to program free format for any caller-ID requirement or DID function
i Unique call progress tones in Japan
i AC power input for 100-120VAC, 50-60Hz
i Programmable battery-feed between 21 and 40V @25mA loop current
i International power supply adapter for four different power plugs and 90-250VAC operation is available as an option
i Polarity reverse for calling and called lines
i 6 month warranty




     Telephone numbers:

          1. Primary telephone number: selected by dialing 043 or line1 or 2 as a factory default.

          2. Secondary telephone number: selected by dialing 044.

              A secondary telephone number is same as a calling number in caller-ID.


     DTMF dialing signal power: -13dBm to +5dBm per a frequency with no more than 4dB

     difference between frequencies.

     DTMF dialing detection time: 45 ms

     Pulse dialing: Break period: 45 to 75 ms (60 ms nominal)

                            Make period: 30 to 60 ms (40 ms nominal)


Line Characteristics:

    Input impedance at 1 k Hz: 600 ohms +/- 5%

    Signal Bandwidth: 150 HZ to 3.5 k HZ


Line Impairment Mode:

When a number of 00 and line-number is dialed, line impairment circuit with additional 20dB-    insertion loss and -55dBm of random noise are added to signals between line 1 and 2.

Random noise amplitude is also programmable. Frequency attenuation characteristics and

Envelope-delay distortion is not affected.


Random noise amplitude programming:


    The random noise amplitude is set at –55 dBm as a factory default value, but it may be

    changed by the above dialing method. The factory default value is obtained with nnn=011.

    The smaller number, the lower signal power.

     i.e. nnn=176 for –31 dBm, nnn=088 for -37 dBm, nnn=044 for -43 dBm,

     nnn=022 for -49 dBm, nnn=005 for -61 dBm , nnn=000 for -67 dBm of random noise.


Rear Panel of LS15-N is shown below:




Non-impairment mode:

    When a number of 09 and a line number is dialed, the insertion loss between

    lines becomes only 1 dB, and the random noise is removed. This is the factory default



Battery-feed voltage (loop voltage):

    Selection between -20 or -40 volts:

    1. -20 volts mode is selected by dialing 041, and it is a factory default condition.

    2. -40 volts mode is selected by dialing 042. The battery-feed voltage is changed to -20 volt

        mode when called line is ringing or in its off-hook state (answered). When the called line

        hangs up the line, the battery-feed voltage is returned to -40 volts.

Ring Signal:

16 +/- 2% Hz sine wave. Normally 2 sec on 4 sec off with frequency programmable by using control software.

Amplitude: 67V RMS into open circuit. It is 66 V RMS into RN=0.1, 56 V RMS into RN=0.5,

        48V RMS into RN=1, and 40V RMS into RN=1.7.

        According to the FCC-part 68 rule, the RN=7000/(equivalent resistive value in ohms)

       for ring signal of 20Hz +/- 3%.

The ring signal at a called line is disabled by dialing *0. To enable back to ringing at a called

line, dial *0 again.


Off-hook impedance requirement: 400 ohms maximum DC, 600 ohms nominal AC


Call Progress Tones:

    Standard dual-frequency call progress tones: nominal -16 dBm.

        Dial Tone: 400Hz

        Ring-back Tone: 400Hz modulated by 20Hz, 1 sec ON/2 sec OFF.

        Busy Tone: 400, 0.5 sec ON/0.5 sec OFF.

        Accuracy in frequency component: +/- 1%.


Line Input Jacks: USOC-RJ11-C, standard modular phone jacks on front panels for line 1 and 2. Another standard modular phone jack on rear panel for polarity reverse operation for line 2.


Caller-ID generation are available at both lines 1 and 2. Polarity reverse operation that flips polarities of Tip and Ring connectors is available for line 2 at another telephone connector at rear panel.



Power Switch: on when the switch is pushed in, off when the switch is pushed out.


Polarity reverse: polarity reverse function is only available at Line 2.


Network response delay:

    Time delay between the end of dialing and ring-signal application is programmable by the

    following dialing:

         0#170*nnn*, where nnn is a 3-digit decimal number between 1 and 255. The time delay is

         determined by 8.6 ms x (nnn-1). The number, nnn, should not be zero.

         The factory default is 0 seconds.


Forced called-party disconnect:

    When two lines are connected and one line hangs up, disconnect signal is generated to both



Programmable disconnect signal:

    The disconnect signal, which is interruption of loop current at the end of call when one line

    hangs up is programmable by the following dialing:

         0#169*nnn*, where nnn is a 3-digit decimal number between 1 and 255. The time delay is

         determined by 8.6 ms x (nnn). The number, nnn, should not be zero.

    The factory default is 320 ms.


AC/DC Adapter: 100-135VAC or 90-250VAC for International AC/DC Power Adapter option


AC/DC Adapter or Car Battery Adapter input (also as a battery charger): 12VDC

    unregulated, 800mA maximum 


Line Status Display: red LED for each line to indicate off-hook status (continuous on)

    or ringing status (blinking)


Calibration: not required


Power On Indicator: green LED display on front panel


Dimensions: 19 cm (4") W x 4.5 cm (1.75") H x 10 cm (7.5") L


Weight: 500g (1.1 lbs.)


Environmental: Operating temperature: 0 to 35 degree C, Humidity: 85% RH at 35 degree C


Warranty/Service: 6 months limited warranty. No warranty if any factory seal is broken.

    Service is performed at the factory, usually within 5 working days.


Caller-ID Signals:

Signal power: -14dBm into 600

NTT Number Display mode.


Programmable parameters for caller-ID:


    01 + Date + Time, i.e. 0106011230 for 12:30 A.M., June1.


    02 + (line number) + (telephone number), i.e. 0225035551212 to assign 5035551212 for

       line 2. The programmed number is the same as the secondary telephone number.

       A caller-ID display with a re-dial feature can dial a calling line.


    02 + (line number) + *, to assign private status.

        Caution: The caller-ID number, which is secondary telephone number, will be destroyed by

           setting privacy mode; therefore, the caller-ID number must be reprogrammed again.


    02 + (line number) + #, to assign out-of-area status.

        Caution: The caller-ID number, which is secondary telephone number, will be destroyed by

            this action; therefore, the caller-ID number must be reprogrammed again.


    Telephone number digit: 0 # 1 7 8 * n n n *, where nnn forms a 3-digit decimal number.

        The default value is 10 digit. The maximum number is 18.


The restoration of memory to the following factory standard is done by dialing 04#:


       -Select primary (short) dialing method.

       -Battery-feed voltage of -40V

       -No line impairment mode is selected.

       -The random noise amplitude is set at -55dBm for the line impairment mode.

       -The programmable telephone number and caller-ID telephone numbers if enabled, are set

           as the following ten digits: line 1: 1234567890, and line 2: 2345678901


       -The time and date are set as 12:30 p.m., January 1.

       -No network response delay

       -Disconnect signal of 320 ms


Options and Accessories:

    Car Battery Adapter

    International AC/DC Power Adapter Option for 90-250V power input with four different power plugs (US, UK, Australian, and European) (117V input unit is a standard.)


The following is a list of programmable parameters for LS15N:

  1. Line impairment condition

(a). Ideal line condition

(b). 20 dB insertion loss and random noise

  1. Caller-ID generation
  2. Telephone number method for dialing and caller-ID
  3. Name for caller-ID
  4. Battery-feed voltage selection between 21 and 41 volt
  5. PBX mode
  6. Stutter-tone dial tone
  7. Hot-line mode
  8. Disconnect signal
  9. Network delay
  10. Multi-message or single message format
  11. Date and time for caller-ID
  12. Disabling ring signal



Made in U.S.A.

Micro Seven, Inc. ®

1095-K N.E. 25th Hillsboro, OR, U.S.A.

Home Page: www.microseveninc.com

Email: sales@microseveninc.com

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