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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展信息 |
| 文件頁數(shù)： | 4/16頁 |
| 文件大?。?/td> | 78K |
| 代理商： | MH88617 |
MH88617
Advance Information
2-160
of applications this will not be a problem, however
the device could be damaged if used to drive a very
short line with the maximum battery voltage and
maximum programmable loop current.
For very long loops the constant current drive reverts
to a constant voltage source. A graph of loop current
versus line resistance is shown in Figure 4.
Under fault conditions, Tip or Ring are protected
from short circuits to ground when the current
exceeds the protection trip threshold. Under these
circumstances, the SLIC will go into a power down
mode and periodically check the line status until the
fault has been removed. Thereby minimizing power
dissipation. The SLIC will revert to an operational
state once the fault is removed.
Ringing Amplification
The MH88617 incorporates an internal ringing
amplifier circuit. A balanced ringing signal is applied
across Tip and Ring, when a DC voltage is
connected to the DCRI pin, a low level sinusoidal
signal is applied to RV and RC is set to logic 1. The
ringing voltage is approximately 50 times the signal
at RV. The gain depends on the ringer load and
impedance at ZA. If an absolute gain is required, a
transistor can be fitted across ZA to give 42.
The SLIC also has the ability to provide ringing on
short loops without the need for a high voltage DCRI
supply. This is achieved by connecting the DCRI pin
to a low voltage supply such as +5V or +12V
providing the subscriber equipment ringing detector
has a low enough sensitivity threshold. In this
application the input at RV needs to be a square
wave (refer MSAN-156).
The SLIC has an automatic ring-trip circuit that
ensures the ringing is removed when the subscriber
goes off-hook. However the user must still insure RC
is taken to logic 0 when SHK signals the subscriber
has gone off-hook.
Programmable Input Impedance
By
between ZA and ground (AGND) the device’s input
impedance can be set to match the line impedance.
As shown in Figure 3 and Table 1. A more
comprehensive list is given in MSAN-156.
connecting
external
passive
components
Programmable Network Balance
The network balance of the device can be
programmed
by
connecting
components between GVX and VR, as shown in
Figure 3 and Table 1.
external
passive
Figure 3 - Typical Application Circuit
TIP
RING
VX
VR
AGND
VCC
TIP
RING
+5V
MH88617
Protection
Circuit
Notes:
1) For Resistor and Impedance values
see Table 1
ZA
Z1
VEE
VBAT DCRI
-5V
-48V
RV
LR
GVX
SD3
SD2
SD1
SD0
RDI
ESE
RC
VX
VR
MT896x
ESI
SHK
RDO
SHK
Relay Drive
Output
Loop Current
Adjust Input
LCA
1.0Vrms
Sinewave
(16-68Hz)
1.0Vrms
Sinewave
(12/16kHz)
0-100V
DSTo
DSTi
CLK
F1i
CA
+5V
10k
C1
C2
2) C1 and C2 are 100nF decoupling capacitors
R2
Z2
R1
T
E.G Teccor
P2353AB
F1
F2
3) F1 and F2 Slow Blow Fuses
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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