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參數(shù)資料
| 型號： | MT9042C |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | Multitrunk System Synchronizer(多中繼系統(tǒng)同步裝置) |
| 中文描述： | Multitrunk系統(tǒng)同步器（多中繼系統(tǒng)同步裝置） |
| 文件頁數(shù)： | 5/28頁 |
| 文件大?。?/td> | 126K |
| 代理商： | MT9042C |
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MT9042C
5
from Normal to Holdover.
DPLL no longer uses the virtual reference signal, but
generates an accurate clock signal using storage
techniques. The Compare Circuit then measures the
phase delay between the current phase (feedback
signal) and the phase of the new reference signal.
This delay value is passed to the Programmable
Delay Circuit (See Figure 3).
reference signal is now at the same phase position
as the previous reference signal would have been if
the reference switch not taken place.
Machine then returns the device to Normal Mode.
In Holdover Mode, the
The new virtual
The State
The DPLL now uses the new virtual reference signal,
and since no phase step took place at the input of
the DPLL, no phase step occurs at the output of the
DPLL.
In other words, reference switching will not
create a phase change at the input of the DPLL, or at
the output of the DPLL.
Since internal delay circuitry maintains the alignment
between the old virtual reference and the new virtual
reference, a phase error may exist between the
selected input reference signal and the output signal
of the DPLL. This phase error is a function of the
difference in phase between the two input reference
signals during reference rearrangements. Each time
a reference switch is made, the delay between input
signal and output signal will change. The value of
this delay is the accumulation of the error measured
during each reference switch.
The programmable delay circuit
applying a logic low pulse to the TIE Circuit Reset
(TRST) pin. A minimum reset pulse width is 300ns.
This results in a phase alignment between the input
reference signal and the output signal as shown in
Figure 20.
The speed of the phase alignment
correction
is
limited
to
convergence is in the direction of least phase travel.
can be zeroed by
5ns
per
125us,
and
The state diagrams of Figure 7 and 8 indicate under
which state changes the TIE Corrector Circuit is
activated.
Digital Phase Lock Loop (DPLL)
As shown in Figure 4, the DPLL of the MT9042C
consists of a Phase Detector, Limiter, Loop Filter,
Digitally Controlled Oscillator, and a Control Circuit.
Phase Detector - the Phase Detector compares the
virtual reference signal from the TIE Corrector circuit
with the feedback signal from the Frequency Select
MUX
circuit,
and
provides
corresponding to the phase difference between the
two. This error signal is passed to the Limiter circuit.
The Frequency Select MUX allows the proper
feedback signal to be externally selected (e.g., 8kHz,
1.544MHz or 2.048MHz).
an
error
signal
Limiter - the Limiter receives the error signal from the
Phase Detector and ensures that the DPLL responds
to all input transient conditions with a maximum
output phase slope of 5ns per 125us. This is well
within the maximum phase slope of 7.6ns per 125us
or 81ns per 1.326ms specified by AT&T TR62411.
Loop Filter - the Loop Filter is similar to a first order
low pass filter with a 1.9 Hz cutoff frequency for all
three
reference
frequency
1.544MHz or 2.048MHz). This filter ensures that the
jitter transfer requirements in ETS 300 011 and AT&T
TR62411 are met.
selections
(8kHz,
Control Circuit - the Control Circuit uses status and
control information from the State Machine and the
Input Impairment Circuit to set the mode of the
DPLL.
The three possible modes are Normal,
Holdover and Freerun.
Figure 4 - DPLL Block Diagram
Control
Circuit
State Select
from
Input Impairment Monitor
State Select
from
State Machine
Feedback Signal
from
Frequency Select MUX
DPLL Reference
to
Output Interface Circuit
Virtual Reference
from
TIE Corrector
Limiter
Loop Filter
Digitally
Controlled
Oscillator
Phase
Detector
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MT9042CP | 制造商:Microsemi Corporation 功能描述: 制造商:Mitel Networks Corporation 功能描述: |
| MT9042CP1 | 制造商:Microsemi Corporation 功能描述:SYNCHRONIZER 28PLCC - Rail/Tube 制造商:Microsemi Corporation 功能描述:PB FREE MULTITRUNK SYSTEM SYNCHRONIZER 制造商:Zarlink Semiconductor Inc 功能描述:SYNCHRONIZER 28PLCC - Rail/Tube 制造商:Zarlink Semiconductor Inc 功能描述:PB FREE MULTITRUNK SYSTEM SYNCHRONIZER |
| MT9042CPR1 | 制造商:Microsemi Corporation 功能描述:SYNCHRONIZER 28PLCC - Tape and Reel 制造商:Zarlink Semiconductor Inc 功能描述:SYNCHRONIZER 28PLCC - Tape and Reel |
| MT9043 | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:T1/E1 System Synchronizer |
| MT9043AN | 制造商:Microsemi Corporation 功能描述: |
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