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| 型號： | L8575 |
| 英文描述： | Dual-Resistive,Low-Cost Subscriber Line Interface Circuit(SLIC) |
| 中文描述： | 雙電阻，低成本用戶線接口電路（SLIC） |
| 文件頁數(shù)： | 25/36頁 |
| 文件大?。?/td> | 633K |
| 代理商： | L8575 |
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Lucent Technologies Inc.
25
Advance Data Sheet
March 1997
L8575
Dual-Resistive, Low-Cost SLIC
Supervision
Off-Hook Detection
The off-hook detection threshold is a function of the dc
feed resistors R
1
and R
2
, and of a ratio of resistors that
are fixed on the L8575 silicon die.
Thus, when R
1
= R
2
= 300
, the off-hook threshold is
set at 4 k
. This relationship is shown in the equation
below:
Where,
R
T
is the loop closure threshold
R
1
= R
2
= dc feed resistors = 300
Where,
R
T1
and R
T2
are internal resistors
R
T1
= 170 k
R
T2
= 130 k
Thus,
Ring-Trip Threshold
12-3424(F)
Figure 9. Ring-Trip Threshold
Ring-trip threshold (Figure 9) is calculated as follows:
At ring-trip:
BAT
2
RTH
If,
V
BAT
= V
20 Hz (dc)
Then,
R
RTH
= R
RF
R
RF
= 1 M
; R
L
(ring-trip) = 6 k
[Avg: 2 k
& 10 k
]
∴
Ring-Trip Requirements
I
Ringing signal:
— Voltage: minimum 35 Vrms, maximum 100 Vrms.
— Frequency: 17 Hz to 23 Hz.
— Crest factor: 1.4 to 2.
I
Ringing trip:
—
≤
100 ms (typical),
≤
250 ms (V
BAT
= –33 V,
loop length = 530
).
I
Pretrip:
— The circuits in Figure 10 will not cause ringing trip.
12-2572 (C)
Figure 10. Ring-Trip Circuits
R
T
1
R
R
2
+
2 k
1
–
=
K
T1
+
T1
R
T2
R
0.4333
=
=
R
T
------------------------1
2
170 k
130 k
------------------------------------------------------
1
–
3900
≈
4
k
=
=
LOOP
RESISTANCE
R
L
RING
TIP
300
R
RF
R1
300
R
RF
R
RTH
C
RF
RTN
RTP
V
RTN
(dc) = V
BAT
Z
V
R
RF
R
R
L
+
------------------------------
V
20 Hz (dc)
=
RF
RTH
2R
L
+
600
R
=
1
L
------R
+
R
RTH
= 11 M
2R
RF
C
RF
100 ms
≈
C
RF
= 0.047
μ
F
∴
RING
RING
RING
100
10 k
6 μF
TIP
TIP
TIP
2 μF
200
SWITCH CLOSES < 12 ms
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