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參數(shù)資料
| 型號： | L3092 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | Subscriber Line Interface(用于短波/超短波通信系統(tǒng)的用戶線接口) |
| 中文描述： | 用戶線接口（用于短波/超短波通信系統(tǒng)的用戶線接口） |
| 文件頁數(shù)： | 7/32頁 |
| 文件大小： | 412K |
| 代理商： | L3092 |
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c) Ringing (RING)
d) Boost Battery (BB),(see AppendixB).
The fifth status, Power down (PD), is set by the
output pin PDO of the L3092 that disconnect the
Bias Resistor, RH, of L3000Nfrom ground.
The main difference between Stand-by and
Power down is that in SBY the power consump-
tion on the voltage batteryVB– (– 48V) is reduced
but the L3000N DC Feeding and monitoring cir-
cuits are still active, in PD thepower consumption
on VB- is reduced to zero, and the L3000N is
completelyswitched off.
SLIC OPERATING MODES
Through the L3092 Digital Interfaceit is possibleto
selectsix differentSLIC OPERATINGMODES :
1) Conversationor Active Mode (CVS)
2) Stand - By Mode (SBY)
3) Power - DownMode (PD)
4) AutomaticStand - By Mode(ASBY)
5) Test Mode (TS)
6) Ringing Mode (RNG)
1) CONVERSATION (CVS) OR ACTIVE MODE
This operating mode is set by the control proces-
sor when the Off hook condition has been recog-
nized,
As far as the DC Characteristic is concerned two
different feedingconditionsare present:
a) Current limiting region : the DC impedance of
the SLIC is very high (> 20K
) and therefore the
system works like a current generator. By the
L3092 Digital Interfaceit is possibleto selects the
value of the limiting current.:
60mA,40mA or25mA.
b) A standardresistive feeding mode : the charac-
teristic is equal to a battery voltage (VB-) minus
5V, in serieswith a resistor,whose value is set by
external components(see external componentlist
of L3092).
Switching between the two regions is automatic
withoutdiscontinuity, and dependson the loop re-
sistance. The SLIC AC characteristics are guar-
anteedin both regions.
Fig. 1 shows the DC characteristic in conversa-
tion mode.
Fig. 2 shows the line current versus loop resis-
tance for two different battery values and RFS =
200
.
The allowed maximum loop resistance depends
on the values of the battery voltage (VB), on the
RFS and on the value of the longitudinal current
(I
GDK
). Witha batteryvoltage of 48V, RFS = 200
and I
GDK
= 0mA, the maximum loop resistance is
over 3000
and with I
GDK
= 20mA is about
2000
(see Application Note on maximum loop
resistance forL3000N/L3092SLIC KIT).
In conversation mode the AC impedance at the
line terminals is synthetized by the external com-
ponents ZAC and RP, according to the following
formula :
ZML =ZAC
25
Depending the characteristic of the ZAC network,
ZML can be eithera pure resistanceor a complex
impedance. This allows for ST SLIC to meet dif-
ferent standards as far as the return loss is con-
cerned. The capacitor CCOMPguarantees stabil-
ity to the system.
The two to four wire conversion is achieved by
means of a circuit that can be represented as a
Wheatstonebridge, the branches of whichbeing:
1) The line impedance (Zline).
2) The SLIC impedance at line terminals (ZML).
3) The balancing network ZA connected between
RX input and ZB pinof L3092.
4) The network ZB between ZB pin and ground
that shall copy the line impedance.
It is importantto underline that ZA and ZB are not
equal to ZML and to Zline. They both must be
multiplied by a factor in the range of 10 to 25, al-
lowing use of smaller capacitors.
In case theL3000N/L3092kit is used with a second
generation
programmable
TS5070FN) which is ableto perform the two to four
wire conversion, the two impedances ZA and ZB
canbe removed andthe ZBpin connectedto GND.
The -6dB Tx gain of the L3000N/L3092SLIC kit in
fact allows to keep the echo signal always within
the COMBO Hybrid BalanceFilter dynamic range.
In conversation mode, the L3000N dissipates
about 250mW for its own operation. The dissipa-
tion related to the current supplied to the line shall
be added,in orderto get the total dissipation.
+
2
RP
COMBO
(EG
Table 1.
Pin 12 of L3092 Pin 12 of L3000N (C2)
0
Conversation
B.B
Ringing
+3
–3
Pin 13of L3092
(C1)
Pin 11of L3000N
+3
0
–3
Stand-by
Not Used
Not Used
Not Used
Not Used
Not Used
L3000N - L3092
7/32
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| L3092FN | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:SLIC KIT OPTIMIZED FOR APPLICATIONS WITH BOTH FIRST AND SECOND GENERATION COMBOS |
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| L3092NT | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telecommunication IC |
| L3092TFN | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telecomm Interface， Other/Special/Misc |
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