參數(shù)資料
型號： MT9044
廠商： Mitel Networks Corporation
英文描述： T1/E1/OC3 System Synchronizer(T1/E1/OC3 系統(tǒng)同步裝置（由一個數(shù)字鎖相環(huán)組成）)
中文描述： T1/E1/OC3系統(tǒng)同步器（T1/E1/OC3系統(tǒng)同步裝置（由一個數(shù)字鎖相環(huán)組成））
文件頁數(shù)： 15/34頁
文件大小： 150K
代理商： MT9044
MT9044
15
MT9044 and Network Specifications
The
requirements
tolerance, jitter/wander transfer, frequency accuracy,
frequency holdover accuracy, capture range, phase
change
slope
and
MTIE
rearrangement) for the following specifications.
MT9044
fully
(intrinsic
meets
jitter/wander,
all
applicable
jitter/wander
PLL
during
reference
1.
Bellcore GR-1244-CORE June 1995 for Stratum
3, Stratum 4 Enhanced and Stratum 4
AT&T
TR62411
(DS1)
Stratum 3, Stratum 4 Enhanced and Stratum 4
ANSI T1.101 (DS1) February 1994 for Stratum 3,
Stratum 4 Enhanced and Stratum 4
ETSI 300 011 (E1) April 1992 for Single Access
and Multi Access
TBR 4 November 1995
TBR 12 December 1993
TBR 13 January 1996
ITU-T I.431 March 1993
ITU-T G.813 August 1996 for Option1 clocks for
2048 kbit/s interfaces
10. ITU-T G.812 June 1998 for type IV clocks for
1,544 kbit/s interfaces and 2,048 kbit/s interfaces
2.
December
1990
for
3.
4.
5.
6.
7.
8.
9.
Applications
This section contains MT9044 application specific
details for clock and crystal operation, guard time
usage, reset operation, power supply decoupling,
Manual Control operation and Automatic Control
operation.
Master Clock
The MT9044 can use either a clock or crystal as the
master timing source.
In Freerun Mode, the frequency tolerance at the
clock outputs is identical to the frequency tolerance
of the source at the OSCi pin. For applications not
requiring an accurate Freerun Mode, tolerance of the
master
timing
source
may
applications requiring an accurate Freerun Mode,
such as Bellcore GR-1244-CORE, the tolerance of
the master timing source must Be no greater than
±
32ppm.
be
±
100ppm.
For
Another consideration in determining the accuracy of
the master timing source is the desired capture
range. The sum of the accuracy of the master timing
source and the capture range of the MT9044 will
always equal
±
230ppm. For example, if the master
timing source is
±
100ppm, then the capture range
will be
±
130ppm.
Clock Oscillator
- when selecting a Clock Oscillator,
numerous parameters must be considered. This
includes absolute frequency, frequency change over
temperature, output rise and fall times, output levels
and duty cycle. See AC Electrical Characteristics.
Figure 9 - Clock Oscillator Circuit
For applications requiring
±
32ppm clock accuracy,
the following clock oscillator module may be used.
+5V
20MHz OUT
GND
0.1uF
+5V
OSCo
MT9044
OSCi
No Connection
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