Data Sheet
July 1998
T8502 and T8503 Dual PCM Codecs 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
— 280
300
µs
TX Delay, Relative to 1600 Hz
DXR
f = 500 Hz—600 Hz
—
—
220
µs
f = 600 Hz—800 Hz
—
—
145
µs
f = 800 Hz—1000 Hz
—
—
75
µs
f = 1000 Hz—1600 Hz
—
—
40
µs
f = 1600 Hz—2600 Hz
—
—
75
µs
f = 2600 Hz—2800 Hz
—
—
105
µs
f = 2800 Hz—3000 Hz
—
—
155
µs
RX Delay, Absolute
DRA
f = 1600 Hz
— 190
200
µs
RX Delay, Relative to 1600 Hz
DRR
f = 500 Hz—1000 Hz –40 —
—
µs
f = 1000 Hz—1600 Hz –30 —
—
µs
f = 1600 Hz—2600 Hz
—
—
90
µs
f = 2600 Hz—2800 Hz
—
—
125
µs
f = 2800 Hz—3000 Hz
—
—
175
µs
Round-trip Delay, Absolute
DRTA
Any time slot/channel to — 470
600
µs
any time slot/channel
f = 1600 Hz
Overload Compression
Figure 4 shows the region of operation for encoder signal levels above the reference input power (0 dBm0).
9
8
7
6
5
ACCEPTABLE
REGION
4
3
2
1
1
2
3
4
5
6
7
8
9
FUNDAMENTAL INPUT POWER (dBm)
Figure 4. Overload Compression
5-3586C
Lucent Technologies Inc.
7