DS3251/DS3252/DS3253/DS3254
Table 9-A. DS3 Waveform Template
TIME (IN UNIT INTERVALS)
NORMALIZED AMPLITUDE EQUATION
UPPER CURVE
0.03
-0.85 ? T ? -0.68
-0.68 ? T ? +0.36
0.36 ? T ? 1.4
0.5 {1 + sin[(ꢁ / 2)(1 + T / 0.34)]} + 0.03
0.08 + 0.407e-1.84(T - 0.36)
LOWER CURVE
-0.03
0.5 {1 + sin[(ꢁ / 2)(1 + T / 0.18)]} - 0.03
-0.03
-0.85 ? T ? -0.36
-0.36 ? T ? +0.36
0.36 ? T ? 1.4
Governing Specifications: ANSI T1.102 and Bellcore GR-499.
Table 9-B. DS3 Waveform Test Parameters and Limits
PARAMETER
SPECIFICATION
Rate
44.736Mbps (M20ppm)
Line Code
B3ZS
Transmission Medium
Test Measurement Point
Test Termination
Coaxial cable (AT&T 734A or equivalent)
At the end of 0 to 450ft of coaxial cable
75ꢀ (M1%) resistive
Pulse Amplitude
Between 0.36V and 0.85V
An isolated pulse (preceded by two zeros and
followed by one or more zeros) falls within the
curves listed in Table 9-A.
Pulse Shape
Unframed All-Ones Power Level at 22.368MHz
Unframed All-Ones Power Level at 44.736MHz
Between -1.8dBm and +5.7dBm
At least 20dB less than the power measured at
22.368MHz
Ratio of positive and negative pulses must be
between 0.90 and 1.10.
Pulse Imbalance of Isolated Pulses
Table 9-C. STS-1 Waveform Template
TIME (IN UNIT INTERVALS)
NORMALIZED AMPLITUDE EQUATIONS
UPPER CURVE
0.03
-0.85 ? T ? -0.68
-0.68 ? T ? +0.26
0.26 ? T ? 1.4
0.5 {1 + sin[(ꢁ / 2)(1 + T / 0.34)]} + 0.03
0.1 + 0.61e-2.4(T - 0.26)
LOWER CURVE
-0.03
0.5 {1 + sin[(ꢁ / 2)(1 + T / 0.18)]} - 0.03
-0.03
-0.85 ? T ? -0.36
-0.36 ? T ? +0.36
0.36 ? T ? 1.4
Governing Specifications: Bellcore GR-253 and Bellcore GR-499 and ANSI T1.102.
Table 9-D. STS-1 Waveform Test Parameters and Limits
PARAMETER
SPECIFICATION
Rate
51.840Mbps (M20ppm)
Line Code
B3ZS
Transmission Medium
Test Measurement Point
Test Termination
Coaxial cable (AT&T 734A or equivalent)
At the end of 0 to 450ft of coaxial cable
75ꢀ (M1%) resistive
Pulse Amplitude
0.800V nominal (not covered in specs)
An isolated pulse (preceded by two zeros and
followed by one or more zeros) falls within the
curved listed in Table 9-C.
Pulse Shape
Unframed All-Ones Power Level at 25.92MHz
Unframed All-Ones Power Level at 51.84MHz
Between -1.8dBm and +5.7dBm
At least 20dB less than the power measured at
25.92MHz.
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DALLAS [ DALLAS SEMICONDUCTOR ]
