Symmetricom Time Server User Manual download pdf (Page 19)

6000-100Ch1.fm Rev. D TimeVault™ User’s Manual 1-5

Power Input Specifications Chapter 1: General Information

1.8 Power Input Specifications

The power input specifications of TimeVault are:

1.9 Certifications

1.10 Internal Timing Performance Specifications

The timing accuracy achievable with this product depends on several factors. The most

important is the method TimeVault employs to use the NTP information. It is widely

accepted that the uncertainty of any single NTP packet is on the order of 10 ms. However,

most NTP client programs perform averaging and filtering over several NTP transfers,

improving the accuracy and removing the systematic delays. The performance of the

various NTP clients varies widely, but some are able to achieve accuracies below 1 ms.

Inherent accuracy:

• With GPS synchronization, approximately 125 µs (this accuracy exceeds that which

the NTP protocol delivers over a network)

• With ACTS synchronization, 5 ms.

In this case, the system accuracy is limited to the accuracy of the ACTS input.

• With NTP client mode synchronization, the accuracy of the client software is the

limiting factor in determining the delivered time accuracy.

• Accuracy of packet delivery time to network jack: <0.5 ms

During a synchronization input outage, following initial synchronization of TimeVault to

its input synchronization sources, the time maintained in the unit diverges from the input

at the rate of approximately 6 parts in 10

-6

, if the ambient temperature is maintained

within ± 3 °C.

Power Input

AC Mains:

(base model)

100 to 240 VAC, 47-440 Hz

IEC 320 Connector

–48 VDC

(optional):

–36 to –60 VDC

4 position Barrier Strip Connection

Fuse: 1A Slow-Blow (rear panel)

Power Requirement: <20 W maximum

FCC

CE (applies to base model only)

UL (applies to base model only)

Network timing accuracy is limited to 1-10 ms typical.

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Symmetricom Time Server User Manual Page 19