Data Sheet
February 1998
T7502 Dual PCM Codec with Filters
Transmission Characteristics (continued)
ac Transmission Characteristics (continued)
Table 8. Envelope Delay Distortion
Parameter
Symbol
Test Conditions
Min Typ Max Unit
TX Delay, Absolute
DXA
f = 1600 Hz
—
—
230
µs
TX Delay, Relative to 1600 Hz
DXR
f = 500 Hz—600 Hz
f = 600 Hz—800 Hz
f = 800 Hz—1000 Hz
f = 1000 Hz—1600 Hz
f = 1600 Hz—2600 Hz
f = 2600 Hz—2800 Hz
f = 2800 Hz—3000 Hz
—
—
220
µs
—
—
145
µs
—
—
75
µs
—
—
40
µs
—
—
75
µs
—
—
105
µs
—
—
155
µs
RX Delay, Absolute
DRA
f = 1600 Hz
—
—
275
µs
RX Delay, Relative to 1600 Hz
DRR
f = 500 Hz—1000 Hz
f = 1000 Hz—1600 Hz
f = 1600 Hz—2600 Hz
f = 2600 Hz—2800 Hz
f = 2800 Hz—3000 Hz
–40
—
—
µs
–30
—
—
µs
—
—
90
µs
—
—
125
µs
—
—
175
µs
Round Trip Delay, Absolute
DRTA
With or between channels
—
f = 1600 Hz
—
470
µs
Overload Compression
Figure 4 shows the region of operation for encoder signal levels above the reference input power (0 dBm0).
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ACCEPTABLE
REGION
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Lucent Technologies Inc.
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FUNDAMENTAL INPUT POWER (dBm)
Figure 4. Overload Compression
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