Symmetricom ATS-6511A User Manual page 105

Dual fiber input distribution

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Command Example:

ATS-6511>reference external

Query:

ATS-6511>settings reference:source

external

Warning: Prior to setting the reference to external, make sure the 10MHz signal from the

external reference is plugged in to the 10MHz IN connector on the rear of the ATS-6511B.

Reference Type (6511B/C):

Description: Select type of frequency reference. If an external frequency reference (e.g.,

cesium, MASER) is available that is more stable than the internal reference then the timing

performance can be enhanced by utilizing the external source as the frequency reference for

the system. In order to fully realize the performance benefit the system must be told what

type of reference is being provided to it.

The system supports both monitored and unmonitored use of an external frequency

reference. If the external source is to be monitored by the system then the reference type

(given by settings reference:external:type) specified will be a model number such as

'hp5071a'. This enables the system to know how to communicate with the device and

allows it to query status information from the reference and monitor it for any reported

failures. In instances where monitoring is either not available or not desired then the

reference type specified will be a generic class of oscillator such as 'cesium' or 'maser'.

This enables the system to utilize the external frequency reference but does not perform any

sort of remote monitoring of the reference. Thus, failures of the external reference will not

trigger an alarm on the system unless the failure is catastrophic enough to trigger another

failure mechanism within the system.

Syntax: reference_type (cesium | hp5071a | maser)

Command Example:

ATS-6511>reference_type hp5071a

Query:

ATS-6511>settings reference:external:type

hp5071a

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Troubleshooting

Ats-6511b Ats-6511c