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DIGITAL LINK MEASURING INSTRUMENTS

Digital signal

generator

Specifications

Analog signal

generator

Sine wave signal output

Noise signal output

Conforms to ITU-T Rec. O.131

Output interface

Activating signal generator

Analog receiver

Filters

Input interface

Sine wave signal output

Noise signal output

Conform to ITU-T Rec. O.131

Digital mW signal

Alarm simulation signal

Word pattern manipulation

Error measurement signal

Signalling bit test signal

Signalling distortion measurement

signal (possible to inject measure-

ment signal to selected signalling

channel in any bit: a, b, c, d)

PCM output interface

Conforms to ITU-T Rec. G.703,

G.704 (2.048 MHz, however,

CRC code is not inserted)

TTL output interface

Frequency range: 200 Hz to 10 kHz

Frequency resolution: 10 Hz

Frequency accuracy: ±0.1% ±0.1 Hz

Spurious including harmonics:

>70 dB down (400 to 3500 Hz, +5 dBm), >60 dB down (200 to 400 Hz, +5 dBm),

>50 dB down (3500 to 10000 Hz, +5 dBm)

Level range: –80 to 13.1 dBm

Level resolution: 0.1 dB

Spectral span: 3.9 Hz

Bandwidth: 200 Hz (350 to 550 Hz)

Repetition rate: 256 ms

Level range: –85 to 0 dBm

Level resolution: 0.1 dB

Connector: 3-pole CF

Impedance: 600, 900 Ω balanced

Relative level: –20 to 10 dBr, 0.1 dB steps

Max. DC isolation: ±60 V

DC loop: ICT, OGT selectable

Current direction: Normal, reverse selectable (ICT only)

Spectral span: 7.81 Hz

Bandwidth: 200 Hz

Output level: –55 dB0 nominal

Output interface: Same as analog signal generator

In-band pre-filter: 200 to 6000 Hz

Out-of-band pre-filter: 4.2 to 72 kHz

Psophometric filter: Conforms to ITU-T Rec. O.41

3 kHz flat filter: 300 to 3400 Hz

Band pass filters: 200, 300, 420, 500, 600, 820, 1020, 2400 2800, 3000, 3400, 3600 Hz selectable

Notch filters: 820, 1020 Hz selectable

Filter for S/N meter: Conforms to ITU-T Rec. O.131

Connector: 3-pole CF

Impedance: 600, 900 Ω, high (> 20 kΩ), balanced, unbalanced selectable

Relative level: –20 to +10 dBr, 0.1 dB steps

Max, DC isolation: ±60 V

DC loop: ICT, OGT selectable

Current direction: Normal, reverse, selectable (ICT only)

Frequency range: 200 to 3990 Hz

Frequency resolution: 10 Hz

Frequency accuracy: ±0.1%, ±0.1 Hz

Level range: –60 to 3.1 dBm0

Level resolution: 0.1 dB

Spectral span: 3.9 Hz

Bandwidth: 200 Hz (350 to 550 Hz)

Repetition rate: 256 ms

Level range: –65 to 0 dBm0

Level resolution: 0.1 dB

Conforms to ITU-T Rec. G.711

PCM alarm signals: AIS, signal loss selectable

Frame error signals: 1 in 2, 2 in 4, 3 in 4, 1.5 x 10

–3

, 1.5 x 10

–4

, 1.5 x 10

–5

, 1.5 x 10

–6

selectable

Multiframe error signal: 1 in 2, 2 in 2

Remote end frame alarm: Alarm bit “0” or “1” settable

Remote end multiframe alarm: Alarm bit “0” or “1” settable

Telephone channel time slot: 00000000 to 11111111 settable

Frame word: 00000000 to 11111111 settable

Non-frame word: 00000000 to 11111111 settable

Multiframe word: 00000000 to 11111111 settable

Pseudo-random binary sequence for 64 kbit/s: 2

–1 (ITU-T Rec. O.152)

Pseudo-random binary sequence for 2.048 Mbit/s: 2

–1 (ITU-T Rec. O.151)

Possible to set logic “0” or “1” to selected signalling channel in any bit: a, b, c

Pulse speed: 10, 20 pps selectable

Marker ratio: 10 to 90%, 1 % steps

Output impedance: 120 Ω balanced, 75 Ω unbalanced selectable

Telephone channel number: 30, 31 channels selectable

Signalling: Channel associated signalling, common channel signalling selectable

Coding: HDB3, AMI selectable

Synchronization: Internal, external 8 kHz frame signal (TTL), external 2.048 MHz clock signal (TTL)

or from digital signal receiver selectable

Connector: 3-pole CF (120 Ω bal.), BNC (75 Ω unbal.)

Telephone channel number: 32 channels at 2.038 Mbit/s, signal channel at 64 kHz

Synchronization: Internal, external 8 kHz frame signal (TTL), external 64 kHz (64 kbit/s interface),

external 2.048 MHz (2.048 Mbit/s interface) or frame signal from digital signal

receiver

Connector: D-sub 25 pole (rear panel)

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