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參數(shù)資料
| 型號： | MH88634CV-K |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | Central Office Interface Circuit(用于中央辦公電話線的接口電路（在音頻轉(zhuǎn)換設(shè)備和用戶線之間提供一個(gè)模擬和信號連接）) |
| 中文描述： | 中央辦公室接口電路（用于中央辦公電話線的接口電路（在音頻轉(zhuǎn)換設(shè)備和用戶線之間提供一個(gè)模擬和信號連接）） |
| 文件頁數(shù)： | 4/13頁 |
| 文件大小： | 63K |
| 代理商： | MH88634CV-K |
MH88634CV-K
Advance Information
4
2-4 Wire Conversion
The device converts the balanced 2-Wire input,
presented by the line at Tip and Ring, to a ground
referenced signal at TX. This circuit operates with or
without loop current; signal reception with no loop
current is required for on-hook reception enabling the
detection of Caller Line Identification (CLI) signals.
Conversely,
referenced signal input at RX, to a balanced 2-Wire
signal across Tip and Ring.
the
device
converts
the
ground
The 4-Wire side (TX and RX) can be interfaced to a
filter/codec, such as the Mitel MT896X, for use in
digital voice switched systems.
During full duplex transmission, the signal at Tip and
Ring consists of both the signal from the device to
the line and the signal from the line to the device.
The signal input at RX, being sent to the line, must
not appear at the output TX. In order to prevent this,
the device has an internal cancellation circuit. The
measure of attenuation is Transhybrid Loss (THL).
Transmit and Receive Gain
The Transmit Gain of the device is the gain from the
balanced signal across Tip and Ring to the ground
referenced signal at TX. It is set at 0dB.
The Receive Gain of the device is the gain from the
ground referenced signal at RX to the balanced
signal across Tip and Ring. It is set at -2dB.
Supervision Features
Line Status Detection Outputs
The MH88634CV-K supervisory circuitry provides
the signalling status outputs which are monitored by
the system controller. The supervisory circuitry is
capable of detecting: Ringing Voltage; Forward and
Reverse loop battery; Forward and Reverse loop
current; and Switch Hook.
Ringing Voltage Detect Output (RV)
The RV output provides a logic 0 when ringing
voltage is detected across Tip and Ring. This
detector includes a filter which ensures that the
output toggles at the ringing cadence and not at the
ringing frequency. Typically this output switches to a
logic 0 after 50ms of applied ringing voltage and
remains at a logic 0 for 50ms after ringing voltage is
removed.
RV shall not toggle during ringing.
Forward Loop and Reverse Loop Detect Outputs
(FL & RL)
The FL output provides a logic 0 when either forward
loop battery or forward loop current is detected, that
is the Ring pin voltage is more negative than the Tip
pin voltage.
The RL output provides a logic 0 when either reverse
loop battery or reverse loop current is detected, that
is the Tip pin voltage is more negative than the Ring
pin voltage.
Switch Hook (SHK)
The
SHK
output is active if either forward loop or
reverse loop current is detected, or if forward or
reverse battery voltage is detected.
Control Input
The MH88634CV-K accepts a control signal from the
system controller at the Loop Relay Control input
(LRC). This energizes the relay drive output Loop
Relay Drive (LRD). The output is active low and has
an internal clamp diode to VRLY.
The intended use of this relay driver is to add and
remove the Line Termination from across Tip and
Ring, as shown in Figure 3.
If this Control input and the Supervisory Features are
used as indicated in Figure 3, Loop-Start Signalling
can be implemented.
Mechanical Data
See
specification.
Figure
9
for
details
of
the
mechanical
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MH88634K | Central Office Interface Circuit Preliminary Information |
| MH89101 | Passive Line Termination Circuit Advance Information |
| MH89625C | OPS/DID PCM SLIC Preliminary Information |
| MH89726 | MT8972 Loop Extender Circuits Advance Information |
| MH89728 | MT8972 Loop Extender Circuits Advance Information |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MH88634K | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:Central Office Interface Circuit Preliminary Information |
| MH89101 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:Passive Line Termination Circuit Advance Information |
| MH89625C | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:OPS/DID PCM SLIC Preliminary Information |
| MH89625C-5 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:OPS/DID PCM SLIC Preliminary Information |
| MH89625C-6 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:OPS/DID PCM SLIC Preliminary Information |
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