Micro Seven, Inc.
LS100-2J, 2-line
telephone line simulator with true line impairment option
Front
and rear panels of LS100-2J are shown above.
The Micro Seven’s model LS100-2J simulates long distance telephone
circuit, which includes frequency attenuation characteristics, random noise,
and envelope delay distortion. It also contains 30 Hz ring signal,
dual-frequency call progress tones, and long-digit bi-directional telephone
number.
The Line Impairment condition is programmable by dialing a 3-digit
telephone number among four different telephone line condition.
By a dialing a different telephone number, a different telephone
line condition is simulated. The line impairment condition includes frequency
attenuation characteristics, random noise (white noise), and envelope delay
distortion. Note that the envelope delay distortion is very critical for
high-speed modem communication. The random noise amplitude is adjustable by
turning a potentiometer through a front panel hole.
LS100-2J has just been redesigned to include serial interface
option for programming line impairment conditions and random noise amplitude
while transmitting data. LS100-2J also includes most of features in model
LS100-2A to include dual frequency call progress tone/single frequency call
progress tone, programmable telephone number, stutter dial tone, distinctive
ringing features, etc. The potentiometer adjustment for random noise amplitude
has been eliminated on the rear panel.
Features:
-True
Line Impairment Circuit to test high-speed modems
-simulates
the worst-case telephone line conditions
-programmable
line impairment condition
-envelope
delay distortion, frequency attenuation characteristics, and random noise
-testing
analog modems including high-speed modems
Benefits:
-quick
testing of modems under the worst-case condition
-testing
and demonstration of fax machines and modems under different line impairment
conditions
-Windows-compatible
software for programming
Specifications:
Note
1: all programmed parameters including telephone numbers are stored in
non-volatile memory.
Note
2: LS100-2J is exactly same as LS100-2A with Line Impairment Options 1 and 2,
and serial interface option
DialingTelephone
Numbers: 1. Single-digit primary telephone number
2. Secondary programmable telephone number
3. A
bi-directional telephone number is installed
Frequency
Attenuation Characteristics relative to 1 kHz:
+12 dB +/- 1.5 dB @ 300 Hz
+ 8 dB +/- 2.0 dB @ 500 Hz
+ 8 dB +/- 1.5 dB @ 2500 Hz
+12 dB +/- 1.5 dB @ 3000 Hz
Above Band (>3000 Hz): 80 dB/octave roll-off to 50 dB holding to 10 kHz
Below Band (<300 Hz): 24 dB/octave roll-off
Full
Envelope Delay Characteristics: 800-2600 Hz: 1750 micro seconds nominal
300-3000 Hz: 3000 micro seconds nominal at both band edges
Partial
Envelope Delay Characteristics: 800-2600 Hz: 1250 micro seconds nominal,
300 to 3000 Hz: 2000 micro seconds nominal at both band edges
Random
Noise (white noise): adjustable by control software between -60dBm and -20dBm.
Programming
Line Impairment Option
One
of the following five circuit conditions may be selected by dialing a unique
telephone number or using control software:
1.
Full Line-Impairment Condition, power-up default condition
It includes frequency attenuation characteristics, full envelope delay, and
random noise.
2.
Partial Line Impairment Condition
It includes frequency attenuation characteristics, partial envelope delay, and
random noise.
3.
Line Impairment Condition without Envelope Delay Distortion
4.
20dB insertion losses between lines
5. No
line impairment condition.
Distinctive
ringing features: four types
DTMF
dialing: -13 dBm to +5 dBm per a frequency, and no more than 4 dBm 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 kHz: 600 ohms +/- 5%
Signal
Range: -45 to +5 dBm
Bandwidth noise: 2mV P-P max. (-60 dBm) (full bandwidth mode)
Signal Bandwidth: 150 HZ to 5 kHz (full bandwidth mode)
Off-hook
impedance requirement:
400
ohms maximum DC, 600 ohms nominal AC
Disconnect
Signal (programmable):
There
is interruption of loop current for 0.5 sec when the other line terminates a
call. For example: assuming that the line 1 and 2 are connected. The loop
current of line 1 is interrupted for 0.5 sec when the line 2 hangs up.
Network
delay (programmable)
Selection
of dual Frequency Call Progress tone:
Dial
Tone: 350 Hz + 440 HZ continuous.
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.
Signal Power: - 20 dBm nominal.
Single
frequency call progress tone:
480Hz,
-20 dBm nominal.
Ring
Signal:
90
VRMS 30 Hz square wave
Frequency: 16 to 68 HZ
Interval: nominally 2 sec ON/4 sec OFF
Distinctive Ring Features: User programmable for four different ringing
patterns.
It is set as 2 sec on/4 sec off as a power-up default condition.
Serial
interface option: RS232C interface including 9-pin D-sub M/F cable and control
software for programming
Transmit
Power Adjustment Potentiometers: It attenuates the signal output from the line
between 0 to -40 dB range.
Line
Input Jacks: USOC-RJ11-C, standard modular phone jacks
Power
Requirement: 100-130 VAC, 50/60 HZ
Note: 230V power unit is also available.
Fuse:
0.15A, 3AG, SLOBLO
Dimensions:
8.35" W x 2.5" H x 7.25" L
Weight:
3.5 lbs.
Environmental:
Operating temperature: 0 to 45 degree C Humidity: 85% RH at 45 degree C
Warranty/Service:
6 months limited warranty. Service is performed at the factory, usually within
10 working days.
Options:
1. USB/RS232 adapter
2. 230V AC power option
The
new Windows version of programming software, W2J.EXE, is available as a
standard accessory. The screen display as shown below when the factory default
file “DEFAULT2J” is downloaded from PC. Programming of line impairment
parameters, telephone numbers, saving/loading of programmed parameters,
enabling/disabling of PBX mode, stutter (dial) tones, dual frequency call
progress tone/single frequency call progress tone, disconnect signal period
length, and network delay.
Micro Seven, Inc.
1095-K N.E. 25th Hillsboro, OR 97124 U.S.A.
503-693-6982
fax: 503-693-9742