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參數(shù)資料
| 型號： | MH88615 |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | Standard SLIC with Ringing Amplification(帶振鈴放大作用的標(biāo)準(zhǔn)用戶線接口電路（SLIC）) |
| 中文描述： | 標(biāo)準(zhǔn)用戶接口與振鈴擴(kuò)增（帶振鈴放大作用的標(biāo)準(zhǔn)用戶線接口電路電路（SLIC）） |
| 文件頁數(shù)： | 3/15頁 |
| 文件大?。?/td> | 82K |
| 代理商： | MH88615 |
Preliminary Information
MH88615
2-145
17
CAP
Ring Trip Filter Capacitor
. A capacitor should be connected from this pin to ground
whilst ringing is applied. This filters out low frequency ringing signals preventing false
off-hook conditions.
18
VX
Transmit Signal (output).
This is the analogue signal from the subscriber’s set.
19
IC
Internal Connection.
This pin is internally connected and must be left open circuit.
20
RV
Ringing Voltage. A low level AC sinusoid is applied as the ringing signal at this pin.
This signal is amplified and applied to the subscriber line. A source with less than 10
output impedance should be used to supply this signal.
21, 22,
39, 40
NC
No Connection.
These pins are provided for mechanical mounting only on the surface
mount versions.
23 - 38
Not Fitted.
No pins are fitted in these positions.
Pin Description
Pin#
Name
Description
Functional Description
The Mitel MH88615 standard SLIC provides an
interface between a switching system and a
subscriber loop. The functions provided by the
MH88615 include battery feed, integral ringing
amplifier, 2W to 4W conversion, constant current
feed, off-hook detection and dial pulse detection.
The device is fabricated as a thick film hybrid in a 20
pin package format for SIL and 90
°
versions while
surface mountable packages are 40 pin versions.
The MH88615 is intended for applications where low
cost and a basic functionality are important. The
MH88615 features an integral ringing amplifier which
enables a system designer to provide ringing without
having to generate a high voltage, high current AC
signal.
The SLIC implements a 2-4 wire converter which is
usually connected to a CODEC. This provides an
interface from the 2 wire subscriber loop to a TDM
(time
division
multiplex),
modulation) digital link.
PCM
(pulse
code
Powering of the subscriber line is provided through
precision battery feed resistors on the circuit. The
thick film hybrid circuit also contains control,
signalling and status circuits which combine to
provide a comprehensive line interface solution. A
power denial facility is provided which isolates the
battery feed from the Tip and Ring leads. This can
remove a line from service which will reduce power
consumption.
An Application Note MSAN-151 is available to
provide technical assistance to the customer in their
use of the MH88615 product. The customer can
obtain a copy of the Applications Note from their
local
Mitel
Sales
Representative.
Office,
Distributor
or
DC Current Limit
Under normal Ring ground or Tip ground conditions
the current is limited to 45mA. Both leads should not
be simultaneously grounded.
Ringing and Ring Trip Detection
The MH88615 incorporates an integral ringing
amplifier. When a logic 1 is applied to the Ringing
Control (RC) pin a balanced ringing signal equal to
60x the AC sine wave applied to the RV pin is placed
on the unloaded Tip and Ring leads. See
Recommended Operating Conditions for details of
the AC ringing generator voltages.
The internal off-hook detection circuit monitors
changing DC levels on Tip and Ring and indicates an
off-hook condition by taking SHK pin to logic 1.
Whilst ringing is being applied there is a large AC
component present on the line which must be filtered
at the input to the detection circuit for it to operate
properly. The Application Circuit (Figure 3) shows
how this is achieved. Since C1 will remove dial pulse
signals from the line it must be isolated during pulse
dialing and resistor R1 is switched in using a sense
drive output (SD3) on a Mitel MT896x CODEC.
Applications which solely use DTMF signalling can
have C1 permanently connected to ground. More
details, including an entirely hardware solution for
Ringing Voltage Filtering, are available in MSAN-
151.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MH88615 | ONS Subscriber Line Interface Circuit Advance Information |
| MH88615-1 | ONS Subscriber Line Interface Circuit Advance Information |
| MH88615-3 | ONS Subscriber Line Interface Circuit Advance Information |
| MH88615-7 | ONS Subscriber Line Interface Circuit Advance Information |
| MH88617 | Programmable SLIC with Ringing Amplification Advance Information |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MH88615-1 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:ONS Subscriber Line Interface Circuit Advance Information |
| MH88615-3 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:ONS Subscriber Line Interface Circuit Advance Information |
| MH88615-7 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:ONS Subscriber Line Interface Circuit Advance Information |
| MH88615-T-7 | 制造商:MITEL 功能描述: |
| MH88617 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:Programmable SLIC with Ringing Amplification Advance Information |
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