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參數(shù)資料
| 型號： | MH88500 |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | Hybrid Subscriber Line Interface Circuit (SLIC) Preliminary Information |
| 中文描述： | 混合用戶線接口電路（SLIC）的初步信息 |
| 文件頁數(shù)： | 3/10頁 |
| 文件大小： | 96K |
| 代理商： | MH88500 |
2-35
Preliminary Information
MH88500
Functional Description
Speech Circuit
The speech circuit converts the bidirectional TIP and
RING line pair to a bidirectional single ended junctor
line. Figure 3 illustrates a typical connection between
two SLIC’s through two crosspoint switches. This
configuration gives optimum transhybrid loss as
seen from Figure 4 given that the output impedance
of the Junctor line is 604
.
The MUTE input mutes signals coming from TIP and
RING to the junctor line while allowing the signal
from the junctor to the tip-ring pair to be transmitted.
Loop Detection
The loop detection circuit determines whether a low
enough impedances is across TIP and RING to be
recognized as an off-hook condition.
(Threshold impedance = 5.4k
with no adjustment)
This threshold level can be adjusted by the use of
external resistors as shown in Figure 6. OFHK has
low output drive capability so it may drive CMOS
operating with different power supplies.
Line Feed/Ring Feed Circuit
The line feed circuit provides loop current and the
ability to apply ringing onto TIP and RING. The
impedance from Ring Feed to GND is 600
which
gives the loop current as:
IL = Voltage at RING FEED pin Amps
Telephone Impedance + 600
The positive supply for the line feed circuit is V
A1
through the loop current is determined from RING
FEED and GND.
Relay Drive Circuit
The relay drive circuit switches ringing onto RING
FEED (Fig.7). The diode is present to suppress
voltage transients during relay switches caused by
the inductive coils of the relay. Ringing voltage
includes AC ringing (90V typically) an dDC line
feed voltage (-24V typically).
Figure 3 - SLIC Crosspoint Switch Connection
MH88500
MH88500
TIP
RING
TIP
RING
TIP
RING
TIP
RING
JUNC
JUNC
75
75
CROSSPOINT
SWITCH
SWITCH
CROSSPOINT
16
16
1
3
1
3
相關PDF資料 |
PDF描述 |
|---|---|
| MH88500IN | Hybrid Subscriber Line Interface Circuit (SLIC) Preliminary Information |
| MH88510 | Subscriber Line Interface Circuit (SLIC)(用戶線接口電路（SLIC）（在電話線和語音開關之間提供一個接口）) |
| MH88511 | Subscriber Line Interface Circuit (SLIC)(用戶線接口電路（SLIC）（在電話線和語音開關之間提供一個接口）) |
| MH88520-1 | German Subscriber Line Interface Circuit (SLIC) Preliminary Information |
| MH88524 | Dual 2-4 Wire Circuit(雙2-4線電路（在4線設備和話音開關之間提供兩個接口）) |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MH88500IN | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:Hybrid Subscriber Line Interface Circuit (SLIC) Preliminary Information |
| MH88510 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:Subscriber Line Interface Circuit (SLIC) Preliminary Information |
| MH88511 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:Subscriber Line Interface Circuit (SLIC) Preliminary Information |
| MH88520-1 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:German Subscriber Line Interface Circuit (SLIC) Preliminary Information |
| MH88524 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:Dual 2-4 Wire Circuit Preliminary Information |
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