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參數(shù)資料
| 型號： | L7583D |
| 廠商： | Lineage Power |
| 英文描述： | Line Card Access Switch(線卡存取開關(guān)) |
| 中文描述： | 線卡接入交換機(jī)（線卡存取開關(guān)） |
| 文件頁數(shù)： | 10/20頁 |
| 文件大小： | 404K |
| 代理商： | L7583D |
10
Lucent Technologies Inc.
Data Sheet
November 1999
L7583A/B/C/D Line Card Access Switch
Switching Behavior
When switching from the power ringing state to the idle/
talk state, via simple logic level input control, the L7583
is able to provide control with respect to the timing
when the ringing access contacts are released relative
to the state of the line break contacts.
Make-before-break operation occurs when the line
break switch contacts are closed (or made) before the
ringing access switch contact is opened (or broken).
Break-before-make operation occurs when the ringing
access contact is opened before the line break switch
contacts are closed.
Using the logic level input pins RING, TESTin, and
TESTout, either make-before-break or break-before-
make operation of the L7583 is easily achieved. The
logic sequences for either mode of operation are given
in Table 13 and Table 14. See the Truth Tables (Table
16 and Table 17) for an explanation of logic states.
When using an L758X in the make-before-break mode,
during the ring-to-idle transition, for a period of up to
one-half the ringing frequency, the ring break switch
and the pnpn-type ring access switch can both be in
the ON state. This is the maximum time after the logic
signal at IN
RING
has transitioned that the ring access
switch is waiting for the next zero current cross, so it
can close. During this interval, current that is limited to
the dc break switch current-limit value will be source
from the ring node of the SLIC.
This current is presented to the internal protection cir-
cuit. If the SCR-type protector is used (A or C codes), if
by random probability the ring-to-idle transition occurs
during a portion of the ring cycle when the ringing volt-
age exceeds the protection circuit SCR turn-on voltage,
and if current in excess of the SCR’s turn-on current is
also available, the SCR may turn on. Once the SCR is
triggered on, if the SLIC is capable of supplying current
in excess of the holding current, the SCR may be
latched on by the SLIC.
The probability of this event depends on the character-
istics of the given SLIC and of the holding current of the
L7583 A or C device. The SCR hold current distribution
is designed to be safely away from the test limit of
80 mA. The higher the distribution, the lower the proba-
bility of the latch.
If this situation is of concern for a given board design,
either use the A or C series device in the break-before-
make mode (eliminates the original 25 ms current
pulse) or use a B or D series device (eliminates the
SCR).
Table 13. Make-Before-Break Operation
RING TESTin TESTout
T
SD
State
Timing
Break
Switches
3 & 4
Open
Ring
Return
Switch 7
Closed
Ring
Access
Switch 8
Closed
All Other
Access
Switches
Open
5 V
0 V
0 V
Float
Power
Ringing
Make-
before-
break
—
0 V
0 V
0 V
Float
SW8 waiting for next
zero current crossing
to turn off maximum
time—one-half of
ringing. In this transi-
tion state, current
that is limited to the
dc break switch cur-
rent-limit value will be
sourced from the ring
node of the SLIC.
Zero cross current
has occurred.
Closed
Open
Closed
Open
0 V
0 V
0 V
Float
Idle/Talk
Closed
Open
Open
Open
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| L7583A | Line Card Access Switch(線卡存取開關(guān)) |
| L7583 | Line Test,Tip/Ring, Line Card Access Switches(線測試，振鈴，線卡存取開關(guān)) |
| L7585F | Full-Feature, Low-Power SLIC and Switch(特點(diǎn)齊全，低功耗用戶環(huán)路接口電路和開關(guān)) |
| L7585G | Full-Feature, Low-Power SLIC and Switch(特點(diǎn)齊全的低功耗用戶接口和開關(guān)) |
| L7590C | Telephone Ringing Driver(電話振鈴驅(qū)動器) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L7583DAJ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telecomm/Datacomm |
| L7583DF | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telecomm/Datacomm |
| L7585F | 制造商:AGERE 制造商全稱:AGERE 功能描述:Full-Feature,Low-Power SLIC and Switch |
| L7585G | 制造商:AGERE 制造商全稱:AGERE 功能描述:Full-Feature,Low-Power SLIC and Switch |
| L7590 | 制造商:Bahco 功能描述:PLIER ROUND NOSE 121MM 制造商:Bahco 功能描述:PLIER, ROUND NOSE 121MM |
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