Transcript Manual Measuring Modes

Manual Measuring Modes of ELA 10
Level, Loss
Transmitting /Receiving
Single End Loss Measurement
End to End Loss Measurement
Noise, Spectrum
Noise Measurement
Spectrum Analyser
Line Parameter
Impedance Measurement
Return Loss Measurement
LCL Balance Measurement
Optional Measurements
Echo Test
Group Delay Distortion
Jitter & Frequency Error
Interruption Analysis
Simultaneous Event Counter
To learn more click on the selected topic!
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Transmitting / Receiving
ELA 10 provides two transmitting/receiving modes:
■ 1 FREQ mode (Transmitting/Receiving of one single frequency )
■ 35 FREQ (MTTS) mode (Transmitting/Receiving of 35 frequencies simultaneously)
1 FREQ mode
■ Range: 20 Hz to 20 kHz
■ Resolution: 1 Hz
35 FREQ (MTTS) mode
■ Range: 200 to 3600 Hz
■ Step: 100 Hz
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Single End NEXT / LOSS Measurement
ELA 10 provides three single-end loss measuring modes:
■ Measurement with one single frequency
■ Measurement with 35 frequencies at the same time (200 to 3600 Hz)
■ Measurement in sweep mode (200 Hz to 9 kHz)
Option
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END to END Loss Measurement with (MTTS)
ELA 10 in MTTS transmitting and receiving modes provides:
■ Transmitting 35 frequencies at the same time
■ Receiving 35 frequencies at the same time
Frequency range: 200 to 3600 Hz, frequency step: 100 Hz
The advantages of MTTS :
■ Quick and comfortable
■ No synchronization is necessary between transmitter and far end receiver
ELA 10 in 35 FREQ transmitting mode
ELA 10 in 35 FREQ receiving mode
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Noise Measurement
ELA 10 provides :
■ Noise measurement with selectable weighting filters
■ Noise measurement with Psophometer filter and 1020 conditioning tone
■ 1020 Hz conditioning tone generation
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Spectrum Analyser
Spectrum analyser of ELA 10 is intended to:
■ analyse the in-band and out-band noises
■ analyse the level of distortion products
Selectable Ranges
Selectable Evaluation Modes
Bandwidth
Frequency
range
Zoom OFF
Zoom ON
20 to 360 Hz
2 Hz
1 Hz
0.2 to 3.6 kHz
20 Hz
10 Hz
0.2 to 20 kHz
100 Hz
50 Hz
0.5 to 85 kHz
500 Hz
200 Hz
NORMAL
AVG
PEEK
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Impedance Measurements
ELA 10 provides three impedance measuring modes:
■ Measurement with one single frequency (200 Hz to 10 kHz)
■ Measurement with 35 frequencies at the same time (200 to 3600 Hz)
■ Measurement in sweep mode (200 Hz to 9 kHz)
Option
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Return Loss Measurement
Return loss factor indicates the deviation of line impedance from the nominal value.
ELA 10 performs a bridge measurement comparing the line impedance to an internal
Rn normal resistor.
Three return loss measuring modes are provided:
■ Measurement with one single frequency (200 Hz to 10 kHz)
■ Measurement with 35 frequencies at the same time (200 to 3600 Hz)
■ Measurement in sweep mode (200 Hz to 9 kHz)
Option
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Balance (LCL) Measurement
ELA 10 provides LCL measurement using the test circuit described in ITU-T Rec. 0.9
Tested line
Three balance measuring modes are provided:
■ Measurement with one single frequency (200 Hz to 10 kHz)
■ Measurement with 35 frequencies at the same time (200 to 3600 Hz)
■ Measurement in sweep mode (200 Hz to 9 kHz)
Option
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Echo Test
There are several reasons for the undesirable quality degradation and the appearance of
audible echoes is one of them. This kind of quality degradation is inherent in the network
equipment and the end user phone devices.
For the test of the disturbing echoes ELA 10 transmits short ~1020 Hz signal packets with
proper amplitude shaping and measures the amplitude and the traveling time of the
reflected signal.
Time [s]
Measuring ranges
■ Traveling time range: 15 to 2500 ms
■ Time resolution: 5 ms
■ Amplitude indication: down to -60 dBm
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Group Delay Distortion Measurement
The group delay distortion measurement needs two ELA 10 instruments connected to the ends
of the tested pair. One of them transmits a test tone the other one receives and evaluates it.
ELA 10 applies:
The multi tone test (MTTS) method described in the recommendation ITU-T O.81 Appendix I.
ELA 10 performs Group delay distortion and
level measurements simultaneously.
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Phase Jitter & Frequency Error Measurement
The jitter and frequency error measurement needs two ELA 10 instruments connected
to the ends of the tested pair. One of them transmits a jitter free quartz accurate 1020
Hz test tone the other one receives and evaluates it.
ELA 10 performs the two measurements simultaneously according to rec. ITU-T O.91
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Interruption Analysis
The interruption analysis needs two ELA 10 instruments connected to the ends of the tested
pair. One of them transmits 1020 Hz test tone the other one receives it and detects the micro
interruptions according to rec. ITU-T O.62. An interruption is detected when the level of the
received test tone drops below a designated threshold for more than 0.6 ms.
Short form information
Histogram
The measuring time is adjustable
between 5 min and 72 hours.
List
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Simultaneous Event Counter
The event test needs two ELA 10 instruments connected to the ends of the tested pair.
One of them transmits a test tone the other one receives it and simultaneously counts the
number of events like:
■ Amplitude hits (described in rec. ITU-T O.95)
■ Phase hits (described in rec. ITU-T O.95)
■ Interruptions (described in rec. ITU-T O.61)
■ Noise impulses (described in rec. ITU-T O.71)
Measuring times:
5, 15, 30, 60 min
Maximum count:
65000 for each counter
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