Alcatel Carrier Internetworking Solutions Switch/Router ユーザーズマニュアル

Page 12-26

The loop filter is used to control and correct the phase of timestamps as processed by the 
local clock. The loop filter examines timestamps sent to and from the local clock and can 
adjust them to account for natural wander and jitter.

To view the statistics of the loop filter, enter the 

 command at the system prompt. A 

screen similar to the following is shown:

All of these field variables are determined by the 

NTP

 algorithm

The following section describes the fields displayed using the 

 command.

. The currently estimated offset of this remote association, in seconds. This counter indi-

cates the offset of the peer clock relative to the local clock. 

. A number indicating the local clock’s frequency in relation to a reference clock’s 

Pulse per Second (

PPS

). If the clock is running in perfect synchronization, this number should 

be 1. Otherwise, it will be slightly lower or higher in order to compensate for the time 
discrepancy between the reference clock and the local clock.

. The number of times the poll time has been adjusted to conform to the network.

. The number of seconds since the local clock for this client/server was last 

adjusted.

The memory usage for the 

NTP

 information on the switch can be displayed using the ntpmem 

command. To view memory information, enter the 

 command at the system prompt. A 

screen similar to the following is shown:

The following section describes the fields displayed using the 

 command.

. The number of seconds since the last reset of 

NTP

 (usually a reboot of the 

switch).

. The total number of 

NTP

 associations possible for this switch.

. The number of available spots on this switch for 

NTP

 associations.