Rainbow-electronics DS3150 Instrukcja Użytkownika Pobierz pdf (Strona 8)

DS3150

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Table 1D. T3 TRANSMIT WAVEFORM TEST PARAMETERS AND LIMITS

PARAMETER SPECIFICATION

Rate

44.736Mbps (±20ppm)

Line Code B3ZS

Transmission Medium Coax cable (AT&T 734A or equivalent)

Test Measurement Point At the end of 0ft to 450ft of coax cable

Test Termination

75Ω (± 1%) resistive

Pulse Amplitude Between 0.36V and 0.85V

Pulse Shape An isolated pulse (preceded by two zeros and followed by

one or more zeros) falls within the curves listed in Table 1C

Unframed All Ones Power Level

at 22.368MHz

Between -1.8dBm and +5.7dBm

Unframed All Ones Power Level

at 44.736MHz

At least 20dB less than the power measured at 22.368MHz

Pulse Imbalance of Isolated Pulses Ratio of positive and negative pulses must be between 0.90

and 1.10

Table 1E. STS-1 TRANSMIT WAVEFORM TEMPLATE

TIME AXIS RANGE NORMALIZED AMPLITUDE EQUATIONS

-0.85 ≤ T ≤ -0.68

0.03

-0.68 ≤ T ≤ 0.26 0.5 {1 + sin[(π / 2)(1 + T / 0.34)]} + 0.03

Upper

Curve

0.26 ≤ T ≤ 1.4

0.1 + 0.61e

-2.4(T - 0.26)

-0.85 ≤ T ≤ -0.36

-0.03

-0.36 ≤ T ≤ 0.36 0.5 {1 + sin[(π / 2)(1 + T/0.18)]} - 0.03

Lower

Curve

0.36 ≤ T ≤ 1.4

-0.03

Governing Specifications: Bellcore GR-253 and Bellcore GR-499

Table 1F. STS-1 TRANSMIT WAVEFORM TEST PARAMETERS AND LIMITS

PARAMETER SPECIFICATION

Rate

51.840Mbps (±20ppm)

Line Code B3ZS

Transmission Medium Coax cable (AT&T 734A or equivalent)

Test emasurement Point At the end of 0ft to 450ft of coax cable

Test Termination

75Ω (±1%) resistive

Pulse Shape An isolated pulse (preceded by two zeros and followed by

one or more zeros) falls within the curved listed in Table 1E

Unframed All Ones Power Level

at 25.92MHz

Between -1.8dBm and +5.7dBm

Unframed All Ones Power Level

at 51.84MHz

At least 20dB less than the power measured at 25.92MHz

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 21 22

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