Advance Information
MT9044
MT9044 and Network Specifications
Applications
The MT9044 fully meets all applicable PLL
requirements (intrinsic jitter/wander, jitter/wander
tolerance, jitter/wander transfer, frequency accuracy,
frequency holdover accuracy, capture range, phase
change slope and MTIE during reference
rearrangement) for the following specifications.
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
1. Bellcore GR-1244-CORE June 1995 for
Stratum 3, Stratum 4 Enhanced and Stratum 4
2. AT&T TR62411 (DS1) December 1990 for
Stratum 3, Stratum 4 Enhanced and Stratum 4
3. ANSI T1.101 (DS1) February 1994 for
Stratum 3, Stratum 4 Enhanced and Stratum 4
4. ETSI 300 011 (E1) April 1992 for
Single Access and Multi Access
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 be ±100ppm.
For
5. TBR 4 November 1995
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.
6. TBR 12 December 1993
7. TBR 13 January 1996
8. ITU-T I.431 March 1993
9. ITU-T G.812 June 1998 for type IV clocks for
1,544 kbit/s interfaces and 2,048 kbit/s interfaces
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.
MT9044
+5V
OSCi
+5V
20MHz OUT
GND
0.1uF
OSCo
No Connection
Figure 9 - Clock Oscillator Circuit
For applications requiring ±32ppm clock accuracy,
the following clock oscillator module may be used.
CTS CXO-65-HG-5-C-20.0MHz
Frequency:
Tolerance:
20MHz
25ppm 0C to 70C
15
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