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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)： | 7/17頁 |
| 文件大小： | 91K |
| 代理商： | MH88628 |
2-207
Preliminary Information
MH88628
Constant
Current Region
1k
2k
70
60
50
40
30
20
10
0
Constant
Voltage
Region
R
Loop
(
)
I
Loop
(mA)
Graph 1 - ILoop/RLoop Characteristics
Two wire Port Termination Impedance
The AC termination impedance of 600 or 900
, of
the 2W port, is set using active feedback paths to
give the desired relationship between the line voltage
and the line current. The loop current is sensed
differentially across the two feed resistors and
converted to a single ended signal. This signal is fed
back to the Tip/Ring driver circuitry such that
impedance in the feedback path gets reflected to the
two wire port. The MH88628’s Tip-Ring impedance
(Z
in
) can be set to 600
, 900
or to a user selectable
value. Thus, Z
in
can be set to any international
requirement. The connection to Z1 determines the
input impedance. With Z1 connected to Z600, the
line impedance is set to 600
. With Z1 connected to
Z900, the line impedance is set to 900
. A user
defined impedance can be selected which is 0.1
times the impedance between Z1 and Z2.
For example, with 2200
in series with 11.5nF in
parallel with 8200
, all between Z1 and Z2, the
devices line impedance will be 220
in series with
115nF in parallel with 820
. See Table 3 and Figures
4 & 5.
Network Balance
Transhybrid loss is maximized when the line
termination impedance and SLIC network balance
are matched. The MH88628’s network balance
impedance set can be set to Zin, AT&T (350
+ 1k
//210nF) or to a user selectable value. Thus, the
network balance impedance can be set to any
international requirement, A logic level control input
NS selects the balance mode. With NS at logic low,
an internal network balance impedance is matched
to the line impedance (Z
in
). With NS at logic high, a
user defined network balance impedance is selected
which is 0.1 times the impedance between N1 and
AGND. For example, with 2200
in series with
11.5nF in parallel with 8200
, all between N1 and
AGND, and NS at logic high, the devices network
balance impedance is 220
in series with 115nF in
parallel with 820
; the impedance between N1 and
N2 must be equivalent to 10 times the input
impedance (Z
in
). In addition, with NS at logic high, an
AT&T network balance impedance can be selected
by connecting NATT to N1; in this case, no additional
network is required between N1 and N2. See Table 4
and Figure 6.
12/16kHz Meter Pulse
The MH88628 provides control of an external signal
path to the driver. A 12/16kHz continuous signal can
be applied to the ESI pin. Control of the ESE input
allows the metering signal to be transmitted to the
line.
Unbalanced Detection
The Unbalanced Detect (UD) pin goes low when the
DC current through the two battery feed resistors is
unbalanced i.e., when the average DC current into
the Ring lead exceeds the current flow out of the Tip
lead (indicating that the Ring lead has been
grounded).
When the SLIC is interfaced to ground start
subscriber equipment during the idle state, the UD
output is monitored for indication of the subscribers
Ring Ground signal. The maximum loop current
supplied by the feed circuitry under this condition is
limited.
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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