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參數資料
| 型號： | L9313 |
| 英文描述： | Line Interface and Line Access Circuit Full-Feature SLIC and Ringing for TR-57 Applications |
| 中文描述： | 線路接口和線路接入電路全功能SLIC和敲響訓練班- 57應用 |
| 文件頁數： | 12/40頁 |
| 文件大小： | 746K |
| 代理商： | L9313 |
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Data Sheet
September 2001
Full-Feature SLIC and Ringing Relay for TR-57 Applications
L9313 Line Interface and Line Access Circuit
12
Agere Systems Inc.
State Definitions
(continued)
Primary Control Modes
(continued)
Ground Start
I
Tip amplifier is on, tip break switch is open.
I
The device presents a high impedance (>100 k
) to
pin PT and a current-limited battery (V
BAT2
) to PR.
I
Common-mode current detector is on.
I
Ring trip detector is off.
I
Output RGDET indicates current flowing in the ring
lead.
I
This is not a defined state in the primary control
mode table. It is achieved via the powerup and the
ring amp states in the primary control mode table.
Ringing
I
Switch break switches (SW1 and SW2) are open,
and ring access switches (SW3 and SW4) are
closed.
I
Tip/ring drive amplifiers are powered down.
I
Ring trip circuit is active.
I
Loop supervision and common-mode current detec-
tors are powered down.
I
NSTAT represents the ring trip detector status.
Disconnect
—
Break Before Make
I
The tip and ring amplifiers are turned off to conserve
power.
I
Break switches (SW1 and SW2) are open, and ring
access switches (SW3 and SW4) are open. This
mode is also used as a transitional mode to achieve
break-before-make switching from the power ring to
active or scan mode.
I
All supervision circuits are powered down; NSTAT
overrides the actual loop condition and is forced high
(on-hook).
Tip Amp
I
Tip side break switch is closed, and ring side break
switch and ring access switches are open.
I
SLIC mode is unaffected by reconfiguring the ring
relay via this mode; thus, SLIC will remain in the
mode it was in prior to selecting this mode.
Ring Amp
I
Ring side break switch is closed; tip side break
switch and ring access switches are open.
I
SLIC mode is unaffected by reconfiguring the ring
relay via this mode; thus, SLIC will remain in the
mode it was in prior to selecting this mode.
Reset
I
Selection of device reset via the RESET pin will set
the device into the disconnect break-before-make
state.
Special States
Thermal Shutdown
I
Not controlled via truth table inputs.
I
This mode is caused by excessive heating of the
device, such as may be encountered in an extended
power cross situation.
I
Upon reaching the thermal shutdown temperature,
the device will enter an all-off mode.
I
Upon cooling, the device will re-enter the state it was
in prior to thermal shutdown.
I
Hysteresis is built in to prevent oscillation. In this
mode, supervision output NSTAT is forced low
(off-hook) regardless of loop status or if the discon-
nect logic state is selected.
Battery
Out of Range
I
Not controlled via truth table inputs.
I
This mode is caused by a battery out of range; that
is, the battery voltage rising above
or below a speci-
fied threshold.
I
Upon reaching the specified high or low battery volt-
age, the device will enter an all-off mode.
I
Upon the battery returning to the specified normal
operating range, the device will re-enter the state it
was in prior to the low battery shutdown.
I
Hysteresis is built in to prevent oscillation. In this
mode, supervision output NSTAT is forced low
(off-hook) regardless of loop status or if the discon-
nect logic state is selected.
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