LUCL9310AP-D AGERE [Agere Systems], LUCL9310AP-D Datasheet - Page 43

• Manufacturer Part Number: LUCL9310AP-D
• Description: Line Interface and Line Access Circuit Full-Feature SLIC,Ringing Relay,and Test Access Device
• Manufacturer: AGERE [Agere Systems]

July 2001
Special Functions
Line Test
All measurements that appear at the TESTLEV output
are referenced to the internal V
device. For that reason, there is a test mode in which
V
When making a voltage measurement, first measure
V
When making a current measurement, open the line
break switches and measure V
Table 21. TESTLEV Output Options
Agere Systems Inc.
Test Off
V
Tip-to-Ring Voltage
Tip-to-Ground Volt-
Ring-to-Ground Volt-
VTX, Zero Current
VTX, dc Current Tip/
VTX, dc Current
VTX, dc Current
VITR, Zero Current
VITR, ac Current (tip
REF
REF
REF
age
age
(tip open, ring
open)
Ring (tip closed,
ring closed)
Ring Ground (tip
closed, ring open)
Ring Ground (tip
open, ring closed)
(tip open, ring
open)
closed, ring
closed)
itself will appear at the TESTLEV output.
and subtract V
Test Mode
(continued)
REF
(V
High Impedance
V
V
V
V
V
V
V
V
V
V
V
V
from V
TESTLEV
TL
TIP
TL
RING
TL
TESTLEV
TESTLEV
TESTLEV
TESTLEV
TESTLEV
TESTLEV
|V
V
V
V
V
V
V
TIP
(continued)
TL
TL
ZEROCUR
ZEROCUR
ZEROCUR
ZAC
TL
= V
= V
= V
= –75 (1 – 0.0075 |V
– V
+ V
+ V
|) x V
= –75 (1 – 0.0075 |V
TESTLEV
TESTLEV
TESTLEV
TESTLEV
TESTLEV
REF
RING
REF
REF
= V
= V
= 20 V/A x I
= 10 V/A x I
= –10 V/A x I
= V
= 300 V/A x I
Relationship
TL
voltage of the
REF
) = 75 (1 – 0.0075
+ V
+ V
ZEROCUR
ZAC
.
. This value is
– (V
– (V
– (V
OFFSET
OFFSET
+ V
Full-Feature SLIC, Ringing Relay, and Test Access Device
REF
REF
REF
OFFSET
TIP-to-RING
TIP-to-RING
TIP-to-RING
TIP-to-RING
+ V
+ V
+ V
TL
OFFSET
OFFSET
OFFSET
TL
|) x
|) x
+
+
+
+
)
)
)
—
Unity follower on V
calibration state, use the V
control state table.
Difference amp.
Inverting amp.
Inverting amp.
Unity follower on VTX close to V
SET
the secondary control state table, use tip amp or ring
amp for single-ended current measurement calibration.
Use tip and ring amp for differential current measure-
ment calibration. Do not use the disconnect mode for
current calibration.
Differential current.
Single-ended voltage.
Single-ended voltage.
Unbuffered output of VITR close to V
V
state. In the secondary control state table, use tip amp or
ring amp; for single-ended current measurement calibra-
tion, use tip and ring amp for differential current mea-
surement calibration. Do not use the disconnect mode
for current calibration.
—
ACOFFSET
then subtracted from the V
the actual measurement. Note that due to internal bias-
ing of the line break switches, the value seen at
V
than the value seen with the line break switches closed
under on-hook (open-loop) conditions.
TESTSIG should be externally connected to the
device’s V
This may be done by a high-impedance pull-up resis-
tor. Additionally, TESTSIG should be ac coupled to the
test signal generator.
Table 21 shows design equations to measure the vari-
ous line voltages and currents.
. This is the current measurement calibration state. In
TESTLEV
. This is the current measurement calibration
with the line break switches open will be less
REF
if it is not used during a test condition.
REF
. This is the voltage measurement
Comments
REF
TESTLEV
state in the secondary
REF
that is seen during
+ V
REF
AXOFFSET
+ V
AXOFFSET
+ V
OFF-
+
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