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參數(shù)資料
| 型號： | HC55143IM |
| 廠商： | INTERSIL CORP |
| 元件分類： | 模擬傳輸電路 |
| 英文描述： | Low Power Universal SLIC Family |
| 中文描述： | TELECOM-SLIC, PQCC32 |
| 封裝： | PLASTIC, MS-016AE, LCC-32 |
| 文件頁數(shù)： | 23/35頁 |
| 文件大?。?/td> | 382K |
| 代理商： | HC55143IM |
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4-23
2-Wire Loopback Test
Most of the SLICs in the UniSLIC14 family feature 2-Wire
loopback testing. This loopback function is only activated
when the subscriber is
on hook
and the logic command to
the SLIC is in the Test Active State. (Note: if the subscriber is
off hook
and in the Test Active State, the function performed
is the Line Voltage Measurement.)
During the 2-wire loopback test, a 2k
internal resistor is
switched across the tip and ring terminals of the SLIC. This
allows the SHD function and the 4-wire to 4-wire AC
transmission, right up to the subscriber loop, to be tested.
Together with the 4-wire loopback test in the Open Circuit
logic state, this 2-wire loopback test allows the complete
network (including SLIC) to be tested up to the subscriber
loop.
Pulse Metering
The HC55121, HC55142 and the HC55150 are designed to
support pulse metering. They offer solutions to the following
pulse metering design issues:
1) Providing adequate signal gain and current drive to the
subscriber metering equipment to overcome the attenuation
of this (12kHz, 16kHz) out of band signal.
2) Attenuating the pulse metering transhybrid signal without
severely attenuating the voice band signal to avoid clipping
in the CODEC/Filter.
3) Tailoring the overload levels in the SLIC to avoid clipping
of the combined voiceband and pulse metering signal.
4) Having the provision of silent polarity reversal as a backup
in the case where the loop attenuates the out of band signal
too much for it to be detected by the subscriber’s metering
equipment.
Adequate Signal Gain
Adequate signal gain and current drive to the subscriber’s
metering equipment is made easier by the network shown in
Figure 23. The pulse metering signal is supplied to a
dedicated high impedance input pin called SPM. The circuit
in Figure 23 shows the connection of a network that sets the
2-wire impedance (Z
TR
), at the pulse metering frequencies,
to be approximately 200
. If the line impedance (Z
L
) is equal
to 200
at the pulse metering frequencies, then the 4-Wire
to 2-wire gain (V
TR
/ SPM) is equal 4. Thereby lowering the
input signal requirements of the pulse metering signal.
Note: The automatic pulse metering 2-wire impedance
matching is independent of the programmed 2-wire
impedance matching at voiceband frequencies.
Calculation of the pulse metering gain is achieved by
replacing V
RX
/500k in Equation 15 with SPM/125k and
following the same process through to Equation 21. The
UniSLIC14 sets the 2-wire input impedance of the SLIC
(Z
TR
), including the protection resistors, equal to 200
. The
results are shown in Equation 40.
V
L
TR
Avoiding Clipping in the CODEC/Filter
The amplitude of the returning pulse metering signal is often
very large and could easily over drive the input to the
CODEC/Filter. By using the same method discussed in
section “Transhybrid Balance”, most if not all of the pulse
metering signal can be canceled out before it reaches the
input to the CODEC/Filter. This connection is shown in
Figure 23.
Overload Levels and Silent Polarity Reversal
The pulse metering signal and voice are simultaneously
transmitted, and therefore require additional overhead to
prevent distortion of the signal. Reference section “Off hook
Overhead Voltage” to account for the additional pulse
metering signal requirements.
Most of the SLICs in the UniSLIC14 family feature full
polarity reversal. Full polarity reversal means that the SLIC
can: transmit, determine the status of the line (on hook and
off hook) and provide “silent” polarity reversal. Reference
Equation 39 to program the polarity reversal time.
FIGURE 22. 4-WIRE AND 2-WIRE LOOPBACK TESTS
V
TX
V
RX
TIP
RING
4-WIRE LOOPBACK
UniSLIC14
600
DUAL SUPPLY
CODEC/FILTER
INTERNAL
2-WIRE LOOPBACK
+
-
PTG
A
4-2
=
-------------
= 8
–
Z
-------------------------
8
---------------------------
–
4
–
=
=
(EQ. 40)
FIGURE 23. PULSE METERING WITH TRANSHYBRID
BALANCE
V
TX
V
RX
= 0
500K
500K
500K
PTG
R1
+
-
I
X
A = 1
I
X
R2
500K
UniSLIC14
Z
T
1/80K
5
125K
SPM
12/16kHz
PULSE METERING
INPUT SIGNAL
SETS 2-WIRE
IMPEDANCE
AT 12-16kHz
EQUAL TO
200
HC55120, HC55121, HC55130, HC55131, HC55140, HC55141, HC55142, HC55143, HC55150, HC55151
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HC55150 | Low Power Universal SLIC Family |
| HC55150CB | Low Power Universal SLIC Family |
| HC55150CM | Low Power Universal SLIC Family |
| HC55151 | Low Power Universal SLIC Family |
| HC55120 | IC-VLTG REG POS 10V 1A |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HC5514X | 制造商:Harris Corporation 功能描述: |
| HC5514XB | 制造商:Harris Corporation 功能描述: |
| HC5514XEVAL1 | 功能描述:界面開發(fā)工具 UNISLIC14 FAMILY EVALUATION BRD RoHS:否 制造商:Bourns 產(chǎn)品:Evaluation Boards 類型:RS-485 工具用于評估:ADM3485E 接口類型:RS-485 工作電源電壓:3.3 V |
| HC5514XEVAL2 | 功能描述:界面開發(fā)工具 EVALRD TO GO W/IDT MOTHER BRD RoHS:否 制造商:Bourns 產(chǎn)品:Evaluation Boards 類型:RS-485 工具用于評估:ADM3485E 接口類型:RS-485 工作電源電壓:3.3 V |
| HC5514XEVAL3 | 功能描述:EVAL BOARD TI CODEC MOTHER BOARD RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 過時/停產(chǎn)零件編號 系列:UniSLIC14 標準包裝:1 系列:- 傳感器類型:CMOS 成像，彩色（RGB） 傳感范圍:WVGA 接口:I²C 靈敏度:60 fps 電源電壓:5.7 V ~ 6.3 V 嵌入式:否 已供物品:成像器板 已用 IC / 零件:KAC-00401 相關(guān)產(chǎn)品:4H2099-ND - SENSOR IMAGE WVGA COLOR 48-PQFP4H2094-ND - SENSOR IMAGE WVGA MONO 48-PQFP |
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