MT9042C datasheet(13/28 Pages) MITEL

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Advance Information

MT9042C

MT9042C and Network Speciﬁcations

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.

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

Applications

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.

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

MT9042C

OSCi

No Connection

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