Configuring a Synchronization Priority List

 

Overview

Before connecting the IMG to a network the IMG must be synchronized to a T1/E1 loop timing source such as a T1 or E1 span. The IMG will allow four different clock sources to be connected to various inputs on the rear of the unit. In Clientview an object named "Timing Synchronization Priority List" can be configured. This list will allow the IMG to set a priority on which clock source will get highest priority and which clock source will get lowest priority. For example, if in ClientView the default "Timing Synchronization Priority List" is used the IMG first determines if the Primary Reference Clock Port has a loop timing source on it. If it is does not the IMG determines if the Secondary Reference Clock Port has a loop timing source on it. The IMG continues to check each port in succession that is configured in ClientView looking for a loop timing source connected to it until it finds an available source.

 

Prerequisites

Creating a Logical IMG

Add a Physical IMG

 

Procedure

  1. Right-click the Physical IMG and select New Timing Synchronization Priority List. The Timing Synchronization Priority List pane appears. See Below

    SC_TimingSyncPriorityList_10-5-0.png
     

  2. The priority which the IMG will use the timing ports is generated here. The priority is shown from left to right. The leftmost entry gets the highest or First priority and then the priority decreases as you move to the right. If you double click in the "User Specified" field the pop up screen below will appear. In the dialog box below the entries can be moved up or down to define the priority. Highlight which entry to move and select the Up or Down button and the entry will move accordingly. Highest priority in this screen is the top entry and priority descends as you move down the list.

    SC_TSP_Dialog.png
     

Note: Primary reference and secondary reference are hard coded so they are always configured to accept a loop timing source on TDM Signaling Port 0 and TDM Signaling Port 1 on the IMG. Primary loop can be configured on any bearer offset as shown below.

Note: The Primary and Secondary Reference designators on Signaling0 and Signaling1 port uses a loop timing source such as T1 or E1. It will not accept an external clock source such an atomic clock. The IMG can get its timing from only a T1/E1 signaling type timing source.

 

Below is an explanation of each of the timing references and how they are used:

Primary Reference --> Primary Reference is designated to Signaling/Timing port 0 on the rear of the IMG. The reference designator "Primary Reference" is hardcoded to this port. If a loop timing source is connected to this port it will always be designated as Primary Reference.

Secondary Reference -->Secondary Reference is designated to Signaling/Timing port 1 on the rear of the IMG. The reference designator "Secondary Reference" is hardcoded to this port. If a loop timing source is connected to this port it will always be designated as Secondary Reference

Primary Loop --> Primary Loop can be configured on any of the 28 Bearer Ports or Signaling Ports 2 and 3.

Secondary Loop --> Secondary Loop can be configured on any of the 28 Bearer Ports or Signaling Ports 2 and 3.

Free Running --> This is the internal clock source generated by the IMG. It is not recommended to be used as a clock source to time a network. It is a fall back in case all other clock sources are lost.

Related Topic:

Timing Sync Priority Pane Reference

Configuring Loop Timing