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參數(shù)資料
| 型號： | MH88614 |
| 廠商： | Mitel Networks Corporation |
| 元件分類： | Codec |
| 英文描述： | Programmable CODEC SLIC Advance Information |
| 中文描述： | 可編程解碼器用戶接口進(jìn)展信息 |
| 文件頁數(shù)： | 3/10頁 |
| 文件大小： | 90K |
| 代理商： | MH88614 |
2-131
Advance Information
MH88614
Pin Description- (Continued)
Pin #
Name
Description
19
IC
Internal Connection
20
VX
Transmit (Output)
. The audio output signal appears on this pin and is internally a.c.
coupled. This signal is applied to the programmable CODEC.
21
IC
Internal Connection
22
LCA
Loop Current Adjust (input)
. The circuit has two constant current settings that are logic
selectable
23
IC
Internal Connection
24
LA
Loop Alarm (Output
) When the loop impedance exceeds the maximum limits that the SLIC
can support for a specified voltage & current this output will go low. This indicates that the
SLIC will no longer support the line. Note: This pin will also pulse low if Loop Disconnect
Dialling is performed, and goes low when the phone is on hook.
25
IC
Internal Connection
26
VRING
Ring Voltage Supply
. This pin is the supply for the Ringing signal to the telephone.
(Typically 90V
RMS
on -48V battery).
Message Voltage Supply
. This pin is the supply for the message signal to the telephone.
(Typically -100V)
27
VMSE
28
RE
Ring Enable (Input).
The ringing signal is applied across Tip & Ring by applying a logic 1 to
this pin while the phone is “On Hook”. Ringing will be automatically stopped when the
phone goes “Off Hook” regardless of the state of the RE pin.
29
MSE
Message Signal Enable (Input).
A cadenced signal can be applied to this pin which will
switch the V
MSG
voltage onto Tip & Ring. The output voltage is internally conditioned to
prevent bell tinkle on the telephone. This is automatically switched off when the phone goes
off hook.
30
SHK
Switch Hook (Output).
The output of this pin goes low when the phone goes “Off Hook”
and can be used externally to switch MSE off.
Functional Description
The MH88614 is an ONS SLIC for use with a
programmable / intelligent CODEC or DSP. The SLIC
performs all of the normal interface functions
between the CODEC and the analog telephone set
whilst having such additional features as Earth
Ground Button Detection, message switching and
Ringing switching with zero crossing.
The MH88614 is available as a 30 pin SIL package
to increase board densities.
2 Wire to 4 Wire Conversion
The hybrid performs 2 wire to 4 wire conversion by
taking the 4 wire signal from the programmable
CODEC at VR and converting it to a 2 wire
differential signal at Tip & Ring. The 2 wire signal
applied across Tip & Ring by the phone is converted
to 4 wire signal at Vx which is the output from the
SLIC to the programmable CODEC. Both the VR
input & Vx output are internally a.c. coupled.
Loop Supervision
The Loop Supervision circuit monitors the state of
the phone line and provides three different output
stages.
When the phone goes “Off Hook” the SHK pin goes
low to indicate this state. This pin reverts to a high
state when the phone goes back “On Hook” (see
figure 3).
When the phone is off hook the circuitry can also
detect two other features of the line status namely
Earth Ground Button & Loop Alarm.
A logic low signal on the Earth Ground Button output
indicates that an earth ground path has been applied
to the Tip or Ring lead of the telephone. This function
can be used for recall operations on phone sets with
Earth Ground Buttons.
The Loop Alarm signal low to indicate that the R
Loop
has been exceeded and that the circuit will no longer
support the line.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MH88615 | 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）) |
| 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 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MH88615 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:ONS Subscriber Line Interface Circuit Advance Information |
| 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: |
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