MT9042C Datasheet, PDF (13/28 Pages) Mitel Networks Corporation – Multitrunk System Synchronizer

Advance Information
MT9042C
MT9042C and Network Specifications
Applications
The MT9042C fully meets all applicable PLL
requirements (intrinsic jitter, jitter tolerance, jitter
transfer, frequency accuracy, holdover accuracy,
capture range, phase change slope and MTIE during
reference rearrangement) for the following
specifications.
1. AT&T TR62411 (DS1) December 1990 for
Stratum 3, Stratum 4 Enhanced and Stratum 4
2. ANSI T1.101 (DS1) February 1994 for
Stratum 3, Stratum 4 Enhanced and Stratum 4
3. ETSI 300 011 (E1) April 1992 for
Single Access and Multi Access
4. TBR 4 November 1995
5. TBR 12 December 1993
6. TBR 13 January 1996
7. ITU-T I.431 March 1993
This section contains MT9042C 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 MT9042C 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
applications requiring an accurate Freerun Mode,
such as AT&T TR62411, the tolerance of the master
timing source must Be no greater than ±32ppm.
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 MT9042C 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.
MT9042C
OSCi
+5V
+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.
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