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參數(shù)資料
| 型號： | MH88628 |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | Central Office SLIC(用于中央辦公線卡的用戶線接口電路) |
| 中文描述： | 中央辦公室用戶接口（用于中央辦公線卡的用戶線接口電路） |
| 文件頁數(shù)： | 8/17頁 |
| 文件大?。?/td> | 91K |
| 代理商： | MH88628 |
2-208
MH88628
Preliminary Information
MH88628
Z
Z
10k
10k
Z
10k
10k
GRX0
GRX1
GTX0
GTX1
RX
RRX
RTX
TX
Transmit Gain
:
(Tip-Ring to Tx)
AV= -20log 0.5 + 5k
RTX
RTX = 5k
10
(-AV/20)
-
0.5
Example
RTX=38k
; AV= +4dBV
Receive Gain:
(RX to Tip-Ring)
RRX = 5k
10
(-AV/20)
-0.5
Example:
RRX=4.6k
; AV= -4dBV
25
28
27
26
30
29
+
-
+
-
]
AV= -20log 0.5 + 5k
RRX
]
Ring Trip Detection
The interface permits detection of an Off-Hook
condition during the ringing. If the subscriber set
goes Off-Hook when the ringing signal has been
applied, the DC loop current flow will be detected
within approx. 100msecs and the SHK output will go
low. The ring relay is automatically disabled by the
internal hardware.
Control Decode
The different modes of operation are selected by
decoding the SEL1 and SEL2 inputs (see Table 5).
DTMF
The DTMF tones are transmitted and received at the
4-wire port.
Figure 3 - Gain Programming with External Components
Longitudinal Balance
The longitudinal balance specifies the degree of
common mode rejection in the 2 to 4 wire direction.
Precision laser trimming of internal resistors in the
hybrid ensures good overall longitudinal balance.
The interface circuitry can operate in the presence of
induced longitudinal currents of up to 40mA at 60Hz.
Off-Hook and Dial Pulse Detection
The SHK pin goes low when the DC-loop current
exceeds a specified level. The threshold level is
internally set by the bias voltage of the switch-hook
detect circuitry. Dial pulse can be detected by
monitoring the interruption rate at the SHK pin.
These dial pulses would be debounced by the
system’s software.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MH88631-2 | Central Office Interface (LS/GS) Preliminary Information |
| MH88631 | Central Office Interface (LS/GS) Preliminary Information |
| MH88631-1 | Central Office Interface (LS/GS) Preliminary Information |
| MH88632B | 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模擬和信號連接）) |
| MH88632B | Central Office Interface Circuit Preliminary Information |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MH88630 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:Central Office Interface (LS/GS) Preliminary Information |
| MH88631 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:Central Office Interface (LS/GS) Preliminary Information |
| MH88631-1 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:Central Office Interface (LS/GS) Preliminary Information |
| MH88631-2 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:Central Office Interface (LS/GS) Preliminary Information |
| MH88632 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:Central Office Interface Circuit Preliminary Information |
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