Motorola Canopy 150 Mbps Backhaul, Руководство пользователя

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Issue 1.1 April 2006 Page 102
8.3.10.5 SNTP (Simple Network Time Protocol)
The SNTP client allows the Canopy 150/300 Mb BH to obtain accurate date and time
updates from a networked timeserver. The system time is used for SNMP and event
logging.
SNTP State
When enabled, the Remote Management web page permits the following
attributes to be set:
SNTP IP Address
The IP address of the networked SNTP server.
SNTP Port Number
The port number of the networked SNTP server. By convention the
default value for the port number is 123.
SNTP Poll Interval
The period at which the SNTP client polls the server for time correction
updates. Default 1 hour. If for any reason an SNTP poll fails the client will automatically
perform 3 retries before waiting for the user defined poll period.
Time Zone
The time zone is a fixed offset from GMT that is added to the SNTP time to
allow the expression of time in all geographic time zones.
Daylight Saving
Allows a fixed offset of one hour to be added to the SNTP time in order to
reflect the local daylight saving time.
8.3.10.6 Setting the clock
The Canopy 150/300 Mb BH 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 Canopy 150/300 Mb BH has
been switched off.
SNTP State
If the SNTP State is set to “Disabled”, see Figure 63, then the Remote
Management web page allows the following attributes to be set:
Set Time
Shows the current time in 24 hour mode. The three editable fields display
hours minutes and seconds.
Set Date
Displays the current date. The year, month and day can be set using the
drop-down selection boxes.
Time Zone
See section 8.3.10.5.
Daylight Saving
See section 8.3.10.5.
8.3.11 Diagnostics
To further enhance the diagnostic capabilities of the 58200 the storage of link performance
histograms has been extended to 31 days of storage. To optimise SDRAM (volatile memory)
usage a cascading histogram approach has been adopted. The root histogram is identical to
the histograms in 58100 data that is stored for one hour at a resolution of one seconds. In
58100 the histograms were simple cyclic buffers which never stored more that the last one
hour of data. The new cascading histogram approach daisy chains 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 optimise memory utilization a statistical analysis is performed on
the overflow to reduce the amount of data to be stored. In the case of 58200 the cascading
histograms are defined as:
•
Histogram 1: 1 hour at a resolution of 1 second