8 Web Page Reference
137
The PTP 500 Series bridge has a system clock which can be used to supply accurate date
and time information in the absence of a SNTP server. The system clock is battery backed
and will continue to operate for several days if the 500 Series bridge has been switched off.
If the SNTP State is set to “Disabled”, see Figure 66, then the Remote
Management web page allows the following attributes to be set:
Shows the current time in 24 hour mode. The three editable fields display hours
Displays the current date. The year, month and day can be set using the drop-
See Section.8.3.10.9 “Setting the clock”.
See Section 8.3.10.9 “Setting the clock”
For the PTP 500 Series, the storage of link performance histograms is set to 31 days worth of
data. To optimize RAM (volatile memory) usage of a cascading histogram approach has been
adopted. The data is stored for one hour at a resolution of one second. The histograms use a
cascading approach to daisy chain multiple histograms together. When the first histogram fills
up the overflow from the first is used as an input to the next histogram in line. To optimize
memory utilization, a statistical analysis is performed on the overflow to reduce the amount of
data to be stored. The cascading histograms are defined as::
Histogram 1: 1 hour at a resolution of 1 second
Histogram 2: 24 hours at a resolution of 1 minute
Histogram 3: 30 Days at a resolution of 1 hour
For example, when histogram 1 fills up and starts to overflow the first minute of overflow is
analyzed and the maximum, minimum and mean over that minute are computed and inserted
into histogram 2. When histogram 2 fills up and starts to overflow the first hour of overflow is
analyzed and the maximum, minimum and mean over that hour is computed and inserted into
histogram 3. When histogram 3 starts to overflow, the overflow data is simply discarded.
Содержание PTP 54500
Страница 1: ...PTP 500 Series User Guide MOTOROLA POINT TO POINT WIRELESS SOLUTIONS ...
Страница 2: ......
Страница 132: ...8 Web Page Reference 130 Figure 65 Spectrum Management Slave Screen With Operational Restrictions ...
Страница 190: ...14 Data Rate Calculations 188 Figure 111 QPSK 0 50 Single Payload Figure 112 QPSK 0 75 Single Payload ...
Страница 191: ...14 Data Rate Calculations 189 Figure 113 16 QAM 0 50 Single Payload Figure 114 16 QAM 0 75 Single Payload ...
Страница 192: ...14 Data Rate Calculations 190 Figure 115 64 QAM 0 67 Single Payload Figure 116 64 QAM 0 83 Single Payload ...
Страница 193: ...14 Data Rate Calculations 191 Figure 117 QPSK 0 50 Dual Payload Figure 118 QPSK 0 75 Dual Payload ...
Страница 194: ...14 Data Rate Calculations 192 Figure 119 16 QAM 0 50 Dual Payload Figure 120 16 QAM 0 75 Dual Payload ...
Страница 195: ...14 Data Rate Calculations 193 Figure 121 64 QAM 0 67 Dual Payload Figure 122 64 QAM 0 83 Dual Payload ...
Страница 205: ...16 Legal and Regulatory Notices 203 16 4 Exposure See Section 2 Avoiding Hazards ...