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參數(shù)資料
| 型號： | PBL386652QNS |
| 廠商： | ERICSSON |
| 英文描述： | Subscriber Line Interface Circuit |
| 中文描述： | 用戶線接口電路 |
| 文件頁數(shù)： | 16/18頁 |
| 文件大?。?/td> | 184K |
| 代理商： | PBL386652QNS |
PBL 386 65/2
16
Preliminary
Ringing State
In the ringing state the SLIC will behave as
in the active state with the exception
that the ring relay driver and the ring trip
detector are activated. The ring trip detec-
tor will indicate off hook with a logic low
level at the detector output.
Active State
TIPX is the terminal closest to ground and
sources loop current while RINGX is the
more negative terminal and sinks loop cur-
rent. The loop current or the ground key
detector is activated. The loop current de-
tector indicates off hook with a logic low
level and the ground key detector indicates
active ground key with a logic high level
present at the detector output.
Active Line Voltage State
In PBL 386 65/2 a line voltage measure-
ment feature is available in the active state.
A frequency inversely proportional to the
line voltage is presented on the detector
output (see chapter “Line Voltage Detec-
tor“). The data can be used in a variety of
ways, for example to set transmission pa-
rameters in a programmable CODEC, in-
line testing where short circuits on the line
can be detected and to control the metering
signal amplitude. In the active line voltage
state the SLIC will be as in the active state
except for the detector.
Figure 15. Battery feed characteristics (without the protection resistors on the line).
A:
R
LC
(14)
I
L
(@ V
TR
= 0) = I
LConst
I
LConst
(typ) =
I
LProg
= 500
B, C: I
L
= I
LConst
V
TR
= V
BatVirt
- R
Feed
(I
LProg
- 5
10
-3
)
D:
400
E:
I
L
≈
5 mA
F:
Apparent battery V
App
(@I
L
= 0) = V
BatVirt
+ 5
10
-3
R
Feed
G:
R
FeedG
= 2
25
H:
V
TRMax
= |V
Bat
| - V
BOH
J:
Virtual battery V
BatVirt
(@ I
L
= 5 mA) = |V
Bat
| - 6.8
(17)
R
Feed
= R
+ 40
C
D
B
E
G
F
F
J
H
C
D
A
V
TR
[V]
I
DC characteristics
B
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