11 Technical Appendix
Input 4:
BITS In:
As fixed frequency you can choose between E1 framed or T1 framed
Minimum Quality
Levels:
Synchronization Status Message (SSM) in accordance with ITU G.704-1998 standard includes
4 bit long SSM quality messages received via incoming E1 framed signal. The clock source
quality levels according to G.704-1998 are as follows:
QL-STU/UKN
Quality unknown, existing synchronization network
QL-PRS
Primary Reference Source
QL-PRC
Primary Reference Clock - Rec. G.811
QL-INV3
reserved
QL-SSU-A/TNC
QL-INV5
reserved
QL-INV5
reserved
QL-ST2
QL-SSU-B
QL-INV9
reserved
QL-EEC2/ST3
QL-EEC1/SEC
Synchronous Equipment Timing Source (SETS)
QL-SMC
QL-ST3E
QL-PROV
QL-DNU/DUS
Do not use for synchronization
Example:
User configured QL-SSU-B as Minimum Quality Level for his system. E1 input signal coming from PRC (G.811)
or TNC will be allowed for synchronization, whereas signal coming from Synchronous Equipment Timing Source
(SETS) will not be accepted.
Sa Bits
With Sa Bits you can select one of the Sa4 to Sa8 bits which is allocated for SSM quality messages.
IMS - LANTIME M4000
Date: 27th May 2021
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