Viavi CellAdvisor JD700B Series, Руководство пользователя

Страница: 394 / 813

Chapter 11 Using EV-DO Signal Analyzer
JD700B Series User’s Guide
393
Table 17 Standards of external clock operation
Clock Type Reference Port Switching Standard
External Reference Internal Internal 10 MHz Default
External External Ref Clock Ext Ref (SMA) Manual switching
(Input signal level >-3 dBm)
GPS GPS Clock GPS (SMA) Automatic switching
(GPS signal received)
Trigger Internal Internal Trigger Default
External External Trigger Trigger (SMA) Manual switching
GPS GPS GPS (SMA) Manual switching
Figure 231 Connection ports for external reference clock
Procedure
1
Connect an external reference or a GPS antenna to the JD700B series.
2
Press the SYSTEM hot key.
3
Press the Freq Reference soft key, and then select the reference option: Internal , External 10
MHz , External 13 MHz , External 15 MHz , or GPS .
NOTE
When a GPS antenna is connected and locked, GPS coordinates (longitude and latitude)
are displayed on the screen and frequency reference is automatically set to GPS in the
System > Freq Reference .
Table 18 External reference indicators
Type Indicator Description
Internal
(green)
The green INT icon indicates that the instrument uses the built-in
internal time base.
External
(green)
The green EXT icon indicates that an external reference is connected
and locked and that the instrument uses the same reference clock as
the signal source.
External
(red)
The red EXT icon indicates that an external reference is connect but not
locked.
GPS (green) The green GPS antenna icon indicates that a GPS antenna is
connected and locked.
GPS (yellow) The yellow GPS antenna icon indicates that a GPS antenna is
connected and locking is in progress.
GPS (grey) The grey GPS antenna icon indicates that a GPS antenna is not
connected, failed, or unable to be locked.