Symmetricom TimeProvider 2300, User Manual

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200 TimeProvider 2300/2700 User’s Guide 098-00564-000 Revision A3 – July, 2013
Chapter 4 Provisioning
Provisioning the Input Reference
PQL Usage & Mapping
Different reference inputs may use different scales for quality level. At the input,
these different scales of quality level are mapped to a common scale called PQL
(priority quality level). The PQL scale is a number from 1 to 16, with 1 being the
highest quality and 16 being the lowest. Once all input quality levels are mapped to
PQL, internal processing will only use PQL as the quality indicator. Once all input
quality levels are mapped to PQL, internal processing (such as input selection) will
only use PQL as the quality indicator.
Table 4-2 shows PQL values converted from
SSM or clockClass for frequency references. Table 4-3 shows default PQL values.
Table 4-4 shows PQL values for clock states.
Figure 4-8. PQL Input and Output Mapping
After an input is selected, the internal clock tracks this selected input and assumes
the quality indicated by the PQL of the selected input. At the output, the clock signal
is translated into various output formats, and the clock PQL is mapped to the scale
that is appropriate for each of the output formats.
Table 4-6 shows how PQL is
mapped for frequency outputs.
Table 4-2. PQL for Frequency References - Converted from SSM or clockClass
Input SSM
Option 1
E1 and SyncE
Input SSM
Option 2
T1
Input SSM
Option 2
SyncE
Input PTP
clockClass
G.8265.1
Input PTP
clockClass
Tele2008/Default
To
Input
PQL
04FF 0x1 80 1
0x0 08FF 0x0 82 2
0x2 84 6 3
0CFF 0x7 86 4
88 5
0x4 78FF 0x4 90 7 6
92 13 7
94 8
0x8 96 14 9