Digital Trunk Clocking - NEC UNIVERGE SV9100 Features And Specifications

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Digital Trunk Clocking

The UNIVERGE SV9100 GCD-CP10 has a built-in clock source for all digital trunk blades. Digital trunk

blades are connected via an internal PLO (Phase Locked Oscillator) to derive Primary Clock from the

network in priority order. If priority is set up incorrectly, or if two primary clocks are coming in, slips may

occur causing improper data synchronization. The PLO, equipped with the UNIVERGE SV9100

GCD-CP10 is the timing source for all digital trunk blades in the system. The PLO synchronizes the

system and clocks signals from another office. When the UNIVERGE SV9100 is a clock receiver office,

the PLO generates the clock signal according to the source clock signals received from the source office

in the network. The source clock signals are extracted from digital trunk blades and are supplied to the

The PLO synchronization source priorities are as follows:

GCD-CCTA (External)

If multiple PRIs exist, the system chooses the first one that synchronized with the carrier.

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.

If multiple BRIs exist and no GCD-PRTA or GCD-CCTA (External) exists, the SV9100

GCD-CP10 chooses the first BRI that synchronized with the carrier.

If there is one GCD-PRTA and the one being used for the source goes down, the SV9100

GCD-CP10 looks to see if there are any BRIs installed in the system. If there are no BRIs,

the SV9100 GCD-CP10 becomes the new synchronization source. The reason for this is

when a GCD-PRTA is installed in the system, all T1s must be assigned as (INTERNAL). T1

(INTERNAL) is not a clocking priority.

Default Settings

System Availability

Required Component(s)