參數(shù)資料
型號： LUCL9310AP-D
元件分類： 圓形連接器
英文描述： Top Entry Connector Hood; Enclosure Material:Aluminum Alloy; For Use With:C146 Rectangular Circular Connectors; Thread Size:PG 21; Connecting Termination:Screw; Gender:Male; No. of Contacts:16; Operating Voltage:400V; Series:C-146 RoHS Compliant: Yes
中文描述： 線路接口和線路接入電路全功能用戶接口，振鈴繼電器，測試接入設(shè)備
文件頁數(shù)： 36/60頁
文件大?。?/td> 1053K
代理商： LUCL9310AP-D
Data Sheet
July 2001
Full-Feature SLIC, Ringing Relay, and Test Access Device
L9310 Line Interface and Line Access Circuit
36
Agere Systems Inc.
Applications
(continued)
dc Characteristics
(continued)
Overhead Voltage
(continued)
The TESTSIG and RCV inputs will not overload with an
input signal swing betwen ground and V
CC
– 0.5 V.
However, the SLIC output saturation point (at PT/PR) is
a function of the device overhead. Default overhead
with OVH = 0 is 3.14 dBm into 900
. After that, output
signal swing increases 1 V for every volt that overhead
is increased.
Overhead voltage may need to be increased to accom-
modate on-hook transmission of higher-voltage sig-
nals, such as meter pulse. The following example is
meant to illustrate the design procedure that can be fol-
lowed.
Assume that an on-hook transmission of a 2.2 Vrms
meter pulse into 200
is needed. Further assume
50
protection resistors are used.
V
OH
= 4.0 V + (1+ (2 x Rp)/200) x Vpeak
V
OH
= 4.0 + (1+ (2 x 50)/200) x 2.2 (1.414)
V
OH
= 8.662 V
Adding 0.5 V for tolerance, the overhead needs to be
increased to (8.662 + 0.5) 9.16
≈
9.2 V to allow for an
undistorted on-hook transmission of a 2.2 Vrms meter
pulse into 200
.
The overhead is set with respect to battery voltage and
during a test mode, the battery voltage is unknown.
With zero voltage on RCV input, the output is battery
voltage minus the overhead on the input, which is the
main offset. The small RCV input offset that is multi-
plied by RCV gain to tip/ring output is inconsequential.
Loop Range
The dc loop range is calculated using:
R
L
=
– 2R
P
– R
dc
V
BAT1
is used because the maximum loop range is
being calculated. The loop resistance value where the
device automatically switches to V
BAT2
is calculated in
the Automatic Battery Switch section of this data sheet.
Battery Feed
The L9310 operates in a dc unbalanced mode. In the
forward active state, under open circuit (on-hook) con-
ditions, with the default overhead chosen, the tip to ring
voltage will be a nominal 5.5 V less than the battery.
This is the overhead voltage. The tip and ring overhead
is achieved by biasing ring a nominal 3.5 V above bat-
tery and by biasing tip a nominal 2.0 V below ground.
During off-hook conditions, some dc resistance will be
applied to the subscriber loop as a function of the phys-
ical loop length, protection, and telephone handset. As
the dc resistance decreases from infinity (on-hook) to
some finite value (off-hook), the tip to ring voltage will
decrease as shown in Figure 13.
12-3431a (F)
Figure 13. Tip/Ring Voltage
As illustrated in Figure 13, as loop length decreases,
the tip to ground voltage will decrease with a slope cor-
responding to one-half the internal dc feed resistance
of the SLIC (typical 75
). The ring to ground voltage
will also decrease with a slope corresponding to one-
half the internal dc feed resistance of the SLIC, until the
SLIC reaches the current-limit region of operation. At
that point, the slope of the ring to ground voltage will
increase to the sum of one half the internal dc feed
resistance plus approximately 10 k
.
The dc feed characteristic can be described by:
I
LOOP
=
V
T/R
=
Where:
I
LOOP
= dc loop current.
V
T/R
= dc loop voltage.
V
BAT
= battery voltage magnitude.
V
OH
= overhead voltage.
R
LOOP
= loop resistance, including wire and handset
resistance.
R
P
= protection resistance.
R
dc
= SLIC internal dc feed resistance.
Refer to Figure 13 and Figure 14 in this section and to
Figure 12 in the Automatic Battery Switch section.
BAT
-V
V
OH
–
I
LOOP
VTIP TO GND
(1/2)R
dc
BEGIN CURRENT LIMITING
(1/2)R
dc
(1/2)R
dc
+ R
LIM
DECREASING LOOP LENGTH
V
BAT
VRING TO GND
BAT
V
OH
–
R
LOOP
2R
P
R
dc
+
+
----------V
BAT
R
LOOP
V
OH
2R
P
+
–
----V
)
R
LOOP
R
dc
+
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