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DIGITAL LINK MEASURING INSTRUMENTS

190 For product ordering information, see pages 4 –10

Order-wire circuit

•

Manual measurement mode

Table 1 summarizes the manual measurements. Manual measure-

ments can be classified broadly as follows: voice channel, word test,

alarm simulation, error measurement, signalling measurement, jitter

measurement, and order wire.

Voice channel measurement

Manual measurement is used when varying the parameters more

finely than in automatic measurement or when no measurement can

be made in automatic measuring sequences, as in end-to-end mea-

surement. Manual measurement is also suited to observing changes

in results over time.

Word test

Voice channel, frame, non-frame, and multiframe words can be ma-

nipulated or monitored. Thus, spare bits included in the multiframe

and non-frame can be functionally tested and defined and by the cir-

cuit user. The drop insert function of the voice channel can also be

tested.

Alarm simulation

Frame, multiframe, or signal loss pseudo-errors can be inserted into

the signal by the MS371A/A1 to test the alarm response of the equip-

ment.

Error measurement

Per-channel (64 kbit/s) bit errors can be measured. Bit, line code, and

frame word errors at 2 Mbit/s can also be measured. The error rate,

error second, and % error-free second of these errors can then be

automatically calculated.

Jitter measurement

In the digital signal generator, jitter can be generated at 2 Mbit/s inter-

face and the digital signal analyzer can measure the jitter in a received

signal. Combined use of jitter generation and error measuring func-

tions enables measurement of jitter immunity.

Order wire

The front panel of the MS371A/A1 has a phone jack. Connection of a

handset permits use of the circuit to be measured as an order wire.

Table 1 Manual measurement summary

Measurement item

Level measurement

Tone (FLM) √√√√

Tone (SLM) √√√√

Noise

Tone (FLM)

Tone (SLM)

Digital mW (FLM)

Digital mW (SLM)

Noise

Tone

Noise

√√√√

√√

√√√√

√

√√

√√√

√

∗

√

∗

√

∗

√

∗

√

∗

√

∗

√

∗

√

∗

√

∗

√

∗

√

∗

√

∗

√

∗

√

∗

√

∗

√√√√

A-A A-D D-A D-D

Measurement configuration

Gain measurement

Total distortion including

quantizing distortion

Tone

Noise

Tone

Noise

Voice channel

Frame

Non frame

Multiframe

Coder offset

Peak code detection

Idle channel noise

Return loss

Spurious out-of-band signal

Longitudinal balance

Word test

AIS

Signal loss

Frame error

Multiframe error

Remote end frame error

Remote end multiframe alarm

Alarm simulation

Error rate

Number of errors

Error seconds

% error free seconds

Error measurement

E&M signalling distortion

Bit test

Signalling measurement

Jitter immunity

Jitter

Jitter measurement

∗1: When both digital interfaces of the transmitter/receiver are 2 M balanced or unbalanced

∗2: When both digital interfaces of the transmitter/receiver are 2 M balanced or unbalanced 30 channels, CAS

∗3: When the digital interfaces of the receiver is 2 M balanced or unbalanced 30 channels, CAS

∗4: When the digital interfaces of the transmitter is 2 M balanced or unbalanced 30 channels, CAS

∗5: When the digital interface of the transmitter is 2 M balanced or unbalanced

∗6: When the digital interface of the receiver is 2 M balanced or unbalanced

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