lucl9311gp-dt ETC-unknow, lucl9311gp-dt Datasheet - Page 33

• Manufacturer Part Number: lucl9311gp-dt
• Description: Line Interface Line Access Circuit Full-feature Slic With High Longitudinal Balance, Ringing Relay,and Gr-909 Test Access
• Manufacturer: ETC-unknow

July 2001
Applications
dc Characteristics
Battery Feed (continued)
Refer to Figure 13 and Figure 14 in this section and to
Figure 12 in the Automatic Battery Switch section.
Starting from the on-hook condition and going through
to a short circuit, the curve passes through two regions:
Region 1: on-hook and low loop currents: the slope cor-
responds to the dc feed resistance of the SLIC (plus
any series resistance). The open-circuit voltage is the
battery voltage less the overhead voltage of the device.
Region 2: current limit: The dc current is limited to a
value determined by V
plate has a high resistance (10 k ).
Notice that the I-V curve is uninterrupted when the
power is shifted from the high-voltage battery to the
low-voltage battery (if auxiliary battery option is used).
This is shown in Figure 12 in the Automatic Battery
Switch section.
Battery Reversal Rate
The rate of battery reverse is controlled or ramped by
capacitors FB1 and FB2. A chart showing FB1 and FB2
values versus typical ramp time is given below. Leave
FB1 and FB2 open if it is not desired to ramp the rate of
battery reversal.
Table 18. FB1 and FB2 Values vs. Typical
* Typical recommended value for C
Agere Systems Inc.
than 0.033 F.
C
FB1
0.01 F
0.22 F
0.47 F
1.22 F
0.1 F
1.0 F
1.3 F
1.4 F
1.6 F
and C
Ramp Time
FB2
(continued)
*
PROG
(continued)
. This region of the dc tem-
Transition Time
FB1
220 ms
440 ms
900 ms
and C
20 ms
2.25 s
1.8 s
2.5 s
2.7 s
3.2 s
FB2
is less
Longitudinal to Metallic Balance
Longitudinal to metallic balance at PT/PR is specified in
the Electrical Characteristics section of this data sheet.
Supervision
Loop Closure
Loop closure supervision threshold is programmed via
an applied voltage source or ground, through a resistor
at the LCTH input. Loop closure status is presented at
the NSTAT output. NSTAT is an unlatched output that
represents either the loop closure or ring trip status,
depending on the device state. See Table 2 and Table
3 for more details. Loop closure threshold current
(I
where:
R
voltage source.
V
There is a built-in hysteresis associated with the loop
closure detector. The above equation describes the on-
hook to off-hook threshold. To help prevent false
glitches, the off-hook to on-hook threshold will be a typ-
ical 20% lower than the corresponding on-hook to off-
hook threshold.
Connect a 0.01 F to a 0.1 F capacitor from this node,
LCF to V
higher the capacitor, the quieter the filter. If loop closure
filtering is not required, leave LCF open.
250 V
-------------------------------------------------- -
LCTH
LCTH
LCTH
R
Ringing Relay, and GR-909 Test Access
LCT H
) is set by:
is ground or an external voltage source.
is a resistor from the LCTH node to ground or a
REF
CC
–
k
to filter the loop closure detector. The
V
LC TH
= I
LCTH
(mA)
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