NEC SL1000 Features And Specifications Manual page 204

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Table of Contents

SL1000/SL1100

Related Features

ISDN Compatibility

Feature Examples

Digital Trunk Clocking Examples:

If multiple PRIs exist, the first one that synchronized with the carrier is chosen. In this example, the

PRI in slot02 was the first to synchronize with the carrier; therefore, it is the PLO synchronization

If there are multiple PRIs and the one being used for the source goes down, the system begins to

count forward in slot numbers looking for the next available PRI. In this example, the PRI in slot02

went down, so the system now begins looking forward in slot numbers for the next PRI to use as the

clock source.

In this example, the PRI in slot06 (SL1000) slot05 (SL1100) was the first to synchronize with the

carrier and became the PLO synchronization source. The PRI in slot06 (SL1000) slot05 (SL1100) then

went down and the system began looking forward in slot numbers to find the next PLO source. In this

case, the PRI in slot02 was the next source because after it looks through the rest of the slots in the

system, it starts over with slot01.

In this example, there are multiple T1 circuits in the system. There can only be one T1 circuit assigned

as EXTERNAL in the system, so the T1 assigned as EXTERNAL is the PLO synchronization source.

Figure 1-7 Digital Trunk Clocking Example 1

Figure 1-8 Digital Trunk Clocking Example 2

Figure 1-9 Digital Trunk Clocking Example 3

Digital Trunk Clocking