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參數(shù)資料
| 型號(hào)： | 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(hào)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(hào)連接）） |
| 文件頁數(shù)： | 3/13頁 |
| 文件大?。?/td> | 63K |
| 代理商： | MH88634CV-K |
Advance Information
MH88634CV-K
3
19
LRC
Loop Relay Control (Input).
A logic 1 activates the Loop Relay Driver output (LRD).
20
VRLY
Relay Positive Supply Voltage.
Typically +5V. Connects to the relay supply voltage.
21
LRD
Loop Relay Drive (Output).
Connects to the Loop Relay Coil. When LRC is at a logic 1 an
open collector output at LRD sinks current and energizes the relay.
Pin Description (continued)
Pin #
Name
Description
Functional Description
The MH88634CV-K is a Central Office Interface
Circuit (COIC). It is used to correctly terminate a
Central Office 2-wire telephone line. The device
provides a signalling link and a 2-4 Wire line
interface between the Telephone Line and subscriber
equipment. The subscriber equipment can include
Private Branch Exchanges (PBXs), Key Telephone
Systems, Terminal Equipment, Digital Loop Carriers
and Wireless Local Loops.
All descriptions assume that the device is connected
as in the application circuit shown in Figure 3.
Isolation Barrier
The MH88634CV-K provides an isolation barrier
which is designed to meet FCC Part 68 (November
1987) Leakage Current Requirements.
External Protection Circuit
An external Protection Circuit Device assists in
preventing
damage
to
subscriber’s
equipment,
conditions.
The
type
of
dependant upon the application and regulatory
standards. Further details should be obtained from
the specific country’s regulatory body. Typically you
will need lightening protection supplied by resettable
fuses or PTC
TM
and mains crossover protection via a
foldover diode.
the
due
protection
device
to
and
the
over-voltage
required
is
Suitable Markets
The MH88634CV-K has fixed 600
line and network
balance impedance for use in North America and
Asia.
Line Termination
When LRC is at a logic 1, LRD will sink current which
energizes the Loop Relay (K1), connecting XLA to
XLB and XLC to XLD. This places a line termination
across Tip and Ring. The device can be considered
to be in an off-hook state and DC loop current will
flow. The line termination consists of a DC resistance
and an AC impedance. When LRC is at a logic 0, the
line termination is removed from across Tip and
Ring.
An internal Dummy Ringer is permanently connected
across Tip and Ring which is a series AC load of
(17k
+330nF).
This
represents
telephone ringer and allows ringing voltages to be
sensed. This load can be considered negligible when
the line has been terminated.
a
mechanical
Depending on the Network Protocol being used the
Line Termination can terminate an incoming call,
seize the line for an outgoing call, or if applied and
disconnected at the correct rate can be used to
generate dial pulse signals.
The DC line termination circuitry provides the line
with
an
active
DC
load
equivalent to a DC resistance of 280
at 20mA.
termination
which
is
Ringing Equivalent Number
The Ringing Equivalent Number (REN) is application
specific.
See
the
governing
specification for details.
regulatory
body
Input Impedance
The input impedance (Zin) is the AC impedance that
the MH88634CV-K places across Tip and Ring to
terminate the Telephone line. This is fixed at 600
.
Network Balance Impedance
The MH88634CV-K Network Balance Impedance is
fixed at 600
.
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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