Manual Measuring Modes of ELA 10

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Level, Loss

Noise, Spectrum

Line Parameter

Optional Measurements

Transmitting /Receiving

Single End Loss Measurement

End to End Loss Measurement

Noise Measurement

Spectrum Analyser

LCL Balance Measurement

Impedance Measurement

Return Loss Measurement

Echo Test

Group Delay Distortion

Jitter & Frequency Error

Interruption Analysis

Simultaneous Event Counter

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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)

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Option

ELA 10 in MTTS transmitting and receiving modes provides: ■ Transmitting 35 frequencies at the same time ■ Receiving 35 frequencies at the same timeFrequency 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

END to END Loss Measurement with (MTTS)

ELA 10 in 35 FREQ receiving mode

ELA 10 in 35 FREQ transmitting mode

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Noise MeasurementELA 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

Frequency range

Bandwidth

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

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

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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)

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Option

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)

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Option

Balance (LCL) Measurement ELA 10 provides LCL measurement using the test circuit described in ITU-T Rec. 0.9

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)

Tested line

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Option

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.

Measuring ranges■■ Traveling time range: 15 to 2500 ms■■ Time resolution: 5 ms■■ Amplitude indication: down to -60 dBm

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Time [s]

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.

ListThe measuring time is adjustable between 5 min and 72 hours.

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Short form information

Histogram

Simultaneous Event Counter

Measuring times: 5, 15, 30, 60 min

Maximum count: 65000 for each counter

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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)

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