參數(shù)資料
型號： PEF24622
英文描述： ?SOCRATES-4?
中文描述： ？蘇格拉底- 4？
文件頁數(shù)： 35/73頁
文件大小： 1618K
代理商： PEF24622
PEB 2466
PEF 2466
Operational Description
Hardware Reference Manual
26
2001-02-20
4.2.18
Transhybrid Loss
The quality of Transhybrid-Balancing is very sensitive to deviations in gain, group delay,
and deviations inherent to the A/D- and D/A-converters, as well as to all external
components used on a linecard (SLIC, OP
’
s etc.).
Transhybrid loss test setup:
The SICOFI
4-μC test loop
“
DLB-ANA
”
is selected (see
Figure 34
), which connects the
analog output with the analog input. The programmable filters FRR, AR, FRX, AX are
by-passed. The IM-filter is disabled, (H(IM)=0). The balancing filter TH is enabled with
optimized coefficients for this configuration (
V
OUT
=
V
IN
).
A 0 dBm0 sine wave signal with a frequency in the range of 300 Hz to 3400 Hz is applied
to the digital input. The signal levels of the resulting echo at the digital output will stay
below the values shown in
Table 20
.
Table 20
Transhybrid Loss
Input Frequency
Symbol
Transhybrid Loss
min.
27
30
29
27
27
Unit
Test Condition
typ.
40
45
40
35
35
300 Hz
500 Hz
2500 Hz
3000 Hz
3400 Hz
THL
300
THL
500
THL
2500
THL
3000
THL
3400
dB
dB
dB
dB
dB
T
A
= 25
°
C;
V
DD
= 5 V
AGX = AGR = 0 dB;
typical variation of
amplitude:
±
0.15 dB
delay:
±
0.5
μ
s.
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