Windows Time Server


3.2.2 System Variables

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System Variables

Name

Procedure

Leap Indicator 

sys.leap

clock update

Stratum

sys.stratum 

clock update

Precision

sys.precision

system

Root Delay

sys.rootdelay 

clock update

Root Dispersion

sys.rootdispersion

clock update

Reference Clock Ident

sys.refid

clock update

Reference Timestamp

sys.reftime

clock update

Local Clock

sys.clock

clock update

Clock Source

sys.peer

selection

Poll Interval

sys.poll 

local clock

Cryptographic Keys

sys.keys 

authentication

Table 1. System Variables

 

Table 1 shows the complete set of system variables. In addition to the common variables described previously, the following variables are used by the operating system in order to synchronize the local clock.

 

Local Clock (sys.clock): This is the current local time, in timestamp format. Local time is derived from the hardware clock of the particular machine and increments at intervals depending on the design used. An

appropriate design, including slewing and skew-Compensation mechanisms, is described in Section 5.

 

Clock Source (sys.peer): This is a selector identifying the current synchronization source. Usually this will be a pointer to a structure containing the peer variables. The special value NULL indicates there is

no currently valid synchronization source.

 


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