ZL30409 Data Sheet
13
Zarlink Semiconductor Inc.
Maximum Time Interval Error (MTIE)
MTIE is the maximum peak to peak delay between a given timing signal and an ideal timing signal within a
particular observation period.
Phase Continuity
Phase continuity is the phase difference between a given timing signal and an ideal timing signal at the end of a
particular observation period. Usually, the given timing signal and the ideal timing signal are of the same frequency.
Phase continuity applies to the output of the synchronizer after a signal disturbance due to a reference switch or a
mode change. The observation period is usually the time from the disturbance, to just after the synchronizer has
settled to a steady state.
Phase Lock Time
This is the time it takes the synchronizer to phase lock to the input signal. Phase lock occurs when the input signal
and output signal are not changing in phase with respect to each other (not including jitter).
Lock time is very difficult to determine because it is affected by many factors which include:
• initial input to output phase difference
• initial input to output frequency difference
• synchronizer loop filter
Although a short lock time is desirable, it is not always possible to achieve due to other synchronizer requirements.
For instance, better jitter transfer performance is achieved with a lower frequency loop filter which increases lock
time. See AC Electrical Characteristics - Performance for Maximum Phase Lock TIme.
ZL30409 provides a fast lock pin (FLOCK), which, when set high enables the PLL to lock to an incoming reference
within approximately 500 ms.
ZL30409 and Network Specifications
The ZL30409 meets applicable PLL requirements (intrinsic jitter/wander, jitter/wander tolerance, jitter/wander
transfer, frequency accuracy, frequency holdover accuracy, capture range and MTIE during reference
rearrangement) for the following specifications.
1. Telcordia GR-1244-CORE for Stratum 4
2. AT&T TR62411 (DS1) December 1990 for Stratum 4
3. ANSI T1.101 (DS1) February 1994 for Stratum 4
4. ETSI 300 011 (E1) April 1992 for Single Access and Multi Access
5. TBR 4 November 1995
6. TBR 12 December 1993
7. TBR 13 January 1996
MTIE S() TIEmax t() TIEmin t()–=
