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參數(shù)資料
| 型號： | MH88617 |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | Programmable SLIC with Ringing Amplification Advance Information |
| 中文描述： | 可編程用戶接口與振鈴放大進(jìn)展信息 |
| 文件頁數(shù)： | 5/16頁 |
| 文件大?。?/td> | 78K |
| 代理商： | MH88617 |
Advance Information
MH88617
2-161
Table 1 gives table of values for some common
applications. A more comprehensive list is given in
MSAN-156.
Programmable Transmit and Receive
Gain
The transmit gain from Tip and Ring to VX can be
programmed by connecting a resistor between GVX
and VX. Similarly the Receive Gain from VR to Tip
and Ring can be programmed by connecting an
impedance in series with VR as shown in Figure 3
and Table 1. Refer to MSAN-156 for additional
impedances.
Off-Hook and Dial Pulse Detection
The switch hook detect output (SHK) goes to a logic
1, when loop current is above the detect threshold
(see DC Electrical Characteristics). This occurs
when the subscriber’s equipment seizes the line to
initiate a call or answer a call. When loop disconnect
dialling is being used, SHK pulses to logic 0 to
indicate the digits being dialled. This output should
be debounced by the system software.
During On-hook transmission SHK remains at logic
0.
Reversal
During normal operation i.e. LR connected to logic 1,
the DC voltage on Tip is positive with respect to
Ring. This can be reversed by applying a logic 0 to
the Line Reversal pin (LR). This feature is used for
signalling. The SLIC is functional during reversal but
for optimum performance forward operation is
recommended.
Meter-Pulse Injection
If the External Signal Enable (ESE) is taken to logic
1 and a 12kHz or 16kHz Meter Pulse signal is
applied to the ESI pin then this signal will be
amplified and output across Tip and Ring. This is
used for calculating the cost of a telephone call.
The gain of the meter pulse signal varies with
programmed input impedance e.g. with the input
impedance programmed for 600
and a 200
AC
load applied across Tip and Ring the ESI signal will
be amplified by a factor of 2.
Some applications require the 12/16 kHz meter
pulse signal to be ramped before being input at ESI.
Power Down
If AGND is applied to LCA pin the MH88617 will
enter a power down mode where the internal circuitry
is turned off and the power consumption is reduced.
This can be used to conserve power when the line is
inactive.
If the system wants to initiate a call the AGND must
be removed from the LCA before the ringing signal is
transmitted.
If the subscriber initiates a call by seizing the line, SHK
will go to logic 1. The system should monitor this and
respond by removing the AGND from LCA causing the
device to wake up.
Figure 4 - Loop Current vs. Line Resistance
24mA
0
≈
1800
R
LOOP
I
LOOP
VBAT @ -48V
LCA O/C
Constant
Current
Constant
Voltage
≈
2800
14mA
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MH88620IN | C.O. SLIC Preliminary Information |
| MH88620BR | RF CONNECTOR; BANANA PLUG, CRIMP ATTACHMENT FOR RG58 |
| MH88628 | Central Office SLIC(用于中央辦公線卡的用戶線接口電路) |
| MH88631-2 | Central Office Interface (LS/GS) Preliminary Information |
| MH88631 | Central Office Interface (LS/GS) Preliminary Information |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MH88620BR | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:C.O. SLIC Preliminary Information |
| MH88620IN | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:C.O. SLIC Preliminary Information |
| MH88622 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:DUAL OPS SLIC Preliminary Information |
| MH88622-1 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:DUAL OPS SLIC Preliminary Information |
| MH88622-2 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:DUAL OPS SLIC Preliminary Information |
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