Harmonic ProView 2900 - Clock

Chapter 7: Stream Configuration Menu Clock
© Harmonic Inc. Manual p/n 101543/Ver 1.0 7-9 ProView 2900 Series/SW Version 1.94
7.4. Clock
Defines the synchronization source for the ProView 2900.
To access the Stream Clock Configuration menu in the ProView 2900 Front Panel, go to
Configuration 

 Stream 

 Clock.
Clock
Clock Clock
Clock
1
11
1 27MHz Synchronizatio
27MHz Synchronizatio27MHz Synchronizatio
27MHz Synchronization
nn
n
The 27 MHz Synchronization configuration option defines the synchronization source for the
ProView 2900 VCXO.
The Decoder Synchronization Source is a 27 MHz clock, generated by a Voltage Controlled
Crystal Oscillator (VCXO). It is used to synchronize the ProView 2900 to the MPEG stream.
27MHz Synchronization
27MHz Synchronization 27MHz Synchronization
27MHz Synchronization
1
11
1

 STRE
STRE STRE
STREA
AA
AM PCR
M PCRM PCR
M PCR
2
22
2

 FIXED VALUE
FIXED VALUE FIXED VALUE
FIXED VALUE
3
33
3

 GENLOCK
GENLOCKGENLOCK
GENLOCK
4
44
4

 GENLOCK (LipSync)
GENLOCK (LipSync)GENLOCK (LipSync)
GENLOCK (LipSync)
The respective Web Management menu is provided in
the Stream 

 General 

 Clock window.
The available options are:
• STREM PCR – The VCXO is synchronized to the program clock recovered from the PCR
data.
• FIXED VALUE – The VCXO is running in free mode.
• GENLOCK – Synchronizes the ProView 2900 according to MPEG Encoder external
video signal.
• GENLOCK (LipSync) – Additional Genlock that Synchronizes the ProView 2900
according to the Video GenLock input. This feature ensures a range of approximately
4mSec delta time between Audio/Video synchronization.
NOTE
The VCXO is factory calibrated to a fixed 27 MHz clock.