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Features

Simulates 75W coaxial cable, WECO728A (Belden 9231)

Selectable cable lengths from 0ft to1485ft (453m) in 45ft (13.7m) steps

Noise mixer input provides variableS/N ratio simplifying interferencemargin testing to CCITT G.703specifications

Buffered 50W oscilloscope output (¼level) provides end-of-line view ofdata signal for easy pulse maskverification

Accurate over a 3 decade frequencyrange, from 100kHz to 100MHz

Convenient front panel controls anddisplay, calibrated in Feet, Meters,and dB of Attenuation at 4 standardfrequencies

Remote control of all functions viastandard RS-232 port

Compatibility

US and European AMI-PCM codes:

Applications

Design and evaluation of serial datareceivers and repeaters

Replaces almost 1500ft (453m) of75W coaxial cable and multi-tappatch panels in laboratoryexperiments

Allows automated testing oftelecommunications, PBX, CATV,HDTV and LAN equipment

General Description

The ME-1005 is a highly accurate,programmable filter designed to simulatethe attenuation versus frequencycharacteristics of the 75W coaxial cable,type WECO 728A (Belden 9231) specifiedby ANSI and CCITT for use in high speedcommunications networks in the US andaround the world. This same cable is alsofound in office buildings and industrialcomplexes where it forms the backbone ofPBX and LAN communication systems. Bysimulating almost 1500ft (453km) ofcoaxial cable in 45ft (13.7m) increments,the ME-1005 offers a convenient andpractical method of developing and testing

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DS2 - 6.312 Mb/sDS3 - 44.736 Mb/s

CCITT - 32.064 Mb/sCEPT - 8.448 Mb/sCEPT - 34.368 Mb/s

SONET STS-1 - 51.840Mb/s

Ethernet and other LAN protocols

CATV and HDTV signals

communications equipment intended foruse in these high speed networks.

Easy to use front panel controls set theME-1005's simulated cable lengthdisplayed in Feet, Meters, or dB ofAttenuation at 4 standard frequencies (inMHz): 4.2, 17.2, 22.4, and 25.9. A 75Wnoise mixer signal input allowsinterference margin testing with S/N ratiosfrom 9dB to 20dB in accordance withCCITT G.703 while a buffered 50Woscilloscope output simplifies viewing ofindividual data pulses for easy maskverification. All ME-1005 functions can becomputer controlled via a standardRS-232 serial port for automated testapplications. Options include arack-mount chassis and battery backup.

Operating Specifications(Valid at all attenuation settings, test signal (fo) = 22.4 MHz and 0°C < Tambient < 40°C unless otherwise stated)

Input

Terminating Impedance ....................................75W, ±5%

Recommended Frequency Range .... 100kHz to100MHz

Maximum Input Voltage, Absolute

Zero to Peak..................................................... ±5V

Maximum Input Voltage (<0.25dB Compression)

Zero to Peak.................................................. ±3.75

Output

Sourcing Impedance (At 1MHz) ............. 75W/50W,±5%

Maximum Rise/Fall Time At 0dB,

VIN = 1VPEAK-to-PEAK ........................... <2nsec

Maximum Overshoot At 0dB,

VIN = 1VPEAK-to-PEAK ............................... <5%

Short Circuit Tolerance ..............................Continuous

Attenuation Characteristics

Attenuation range at fo with display setting:

fo = 4.2MHz ........................ 0dB to -7.9dBfo = 17.2MHz .................... 0dB to -16.7dBfo = 22.4MHz .................... 0dB to -19.4dBfo = 25.9MHz .................... 0dB to -21.1dB

Frequency dependent attenuation simulates that of

.

The attenuation at any frequency, A(f), can becalculated as a function of the simulated cable lengthas follows:

A(f) = A45(f) X (length/45ft)

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75W coax cable (WECO 728A) at 20ºC. Thefollowing table lists the cable attenuation (A45)verses frequency at a length of 45ft.

Freq.(MHz)

A45 (dB)

.10

.040

.20

.054

.30

.065

.50

.081

.70

.095

1.0

.112

2.0

.162

Freq.(MHz)

A45 (dB)

3.0

.202

4.5

.240

5.0

.264

7.0

.314

10

.376

17.2

.505

20

.550

Freq.(MHz)

A45 (dB)

22.4

.588

25.9

.640

30

.700

50

.936

70

1.13

100

1.33

Attenuation Characteristics

Attenuation tolerance for both the LINE and NOISEinputs and LINE and SCOPE outputs at fo displaysetting:

fo = 4.2MHz ......................... ± 0.25dBfo = 17.2MHz ....................... ± 0.25dBfo = 22.4MHz ....................... ± 0.25dBfo = 25.9MHz ....................... ± 0.25dB

LINE input attenuation accuracy at any frequency isspecified to a maximum of -20dB. NOISE inputattenuation accuracy at any frequency is specifiedto a maximum of -40dB. Attenuation tolerance at all other frequenciesrelative to fo is given by the following graph:

General Specifications Power input voltage:

Option A ...................... 103V to 132VOption B ....................... 210V to 250VOption J .......................... 90V to 110V

Power input frequency ..............................45Hz to66HzPower consumption ................................................14WDimensions (w x h x d in inches) ............... 17 x 3.5 x14Weight.................................................................... 14 lbsStorage temperature ............................... -40°C to85°C

Ordering Information

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