MODEL LS25, the least expensive-see the price list in:

TELEPHONE LINE OR CO SIMULATOR, OR MINI-PBX SIMULATOR, in one-way calling direction only, PROVIDES LOOP CURRENT/LOOP VOLTAGE, RING SIGNAL, CALL PROGRESS TONES, random noise generator, programmable telephone numbers, and programmable telephone numbers.




Micro Seven Model LS25, the Cheapest Line Simulator, CO simulator, or MINI-PBX SIMULATOR, provides complete telephone line simulation including 30Hz square-wave ring signal, dual frequency call progress tones, battery-feed, DTMF& rotary-pulse dialing, and programmable telephone number in a smaller case than LS15 family products. Model LS25 is powered by a standard equipped AC/DC adapter. An international power adapter option for LS25 provides four different power plugs (US/Japan, BK, Australian, and Continental European) for 90-250V power range. An optional car battery adapter may be used to power model LS25. The application of model LS25 includes modem and telephone sets testing in engineering, manufacturing, and fields. The LS25 contains dual frequency call progress tones, 30Hz square wave ring signal, short primary or programmable secondary telephone number, caller-ID signal, stutter dial tone, network response delay, disconnect signal, hot-line mode, PBX mode, and secondary dial-tone. The LS25 also contains a pseudo-line-impairment mode generating random noise. The programmable parameters include telephone numbers, network response delay, caller-ID parameters, call progress tones and disconnect signal period. All the programmable parameters in non-volatile memory are restored when the power switch is turned off. Please note that LS25 provides telephone line simulator function for one direction only. Model LS15-C1, LS15-1 and LS15 provide telephone line simulator functions for both calling directions.


Dialing Telephone Numbers:

1. Primary telephone number as a factory default.
2. Secondary telephone number (programmable up to more than eleven digits long). Please note that a number can not start with 0.

Dialing Method:

DTMF 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)

Simulated PBX Mode: By dialing "9", dial tone returns when the Simulated PBX Mode was selected.

Line Characteristics: Input impedance at 1 k Hz: 600 ohms +/- 5%
Signal Bandwidth: 150 HZ to 3.5 k HZ

Line Impairment Mode: Line impairment circuit with additional 20dB of insertion loss

Battery-feed voltage (loop voltage): -20 volts

Ring Signal: 30 +/- 2% Hz square wave. Normally 2 sec on 4 sec off.
Amplitude: 75VRMS minimum

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: 350 Hz + 440 Hz, continuous unless programmed for stutter dial tone
Ring-back Tone: 440 Hz + 480 Hz, 2 sec ON/4 sec OFF.
Busy Tone: 480 Hz + 620 Hz, 0.5 sec ON/0.5 sec OFF.
Accuracy in frequency component: +/- 1%.

Secondary Call Progress Tones: (480 Hz +/- 1%)
Secondary call progress tones may be selected instead of generating dual frequency call progress tones, single-frequency tone of 480 Hz is produced with signal power of -18.5 dBm.

Stutter dial-tone: enable/disable

Line Input Jacks: line 1: call originating line, line2: call receiving line, USOC-RJ11-C, standard modular phone jacks

Power Switch

Hot Line Mode: In hot Line mode lifting a handset at line 1 calls line 2 automaticallyline without dialing a number. Note that the hot line mode is not restored in power up.

Pseudo line impairment condition mixing random noise into 2-way voices is entered by dialing 002 at line 1 (originating line). Ideal telephone line condition without random noise is obtained by dialing 092.

Network response delay: Time delay between the end of dialing and ring-signal application is programmable.

Forced called-party disconnect: When two lines are connected and one line hangs up, disconnect signal is generated to both lines.

Programmable disconnect signal: The disconnect signal, which is interruption of loop current at the end of call when one line hangs up is programmable.

All programming of telephone numbers, call progress tones, random noise amplitude and other parameters are doe by dialing unique codes starting 0.

Power input: receiving 24VDC with 2.1mm connector

AC/DC Adapter: provided as a standard accessory for 117VAC +/- 5%, or optional for 230V or international power adapter

Calibration: not required

Power On Indicator: green LED display on front panel

Dimensions: 6.5 cm (2.5") W x 3.3 cm (1.5") H x 18 cm (5") L

Weight: about 250g (about 0.5 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.

Options and Accessories:

Car Battery Adapter

International power adapter option (117V input unit is a standard.)

Micro Seven, Inc., 1095-K N.E. 25th Hillsboro, OR 97124, U.S.A. Phone: 503-693-6982, Fax: 503-693-9742 or if you have any questions or E-mail: