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Protocol Settings
R&S
®
EX-IQ-BOX
155
User Manual 1409.5570.32 ─ 05
Breakout Board Revision
Shows the revision number of the connected breakout board.
Remote command:
7.2.7.2
Reference Clock
Section "Reference Clock" provides the selection of the clock source for the CPRI com-
munication link. Depending on the CPRI test mode, the possible sources for the reference
signal differ.
Source
Selects the source of the reference signal. In test mode CPRI RE, the R&S
EX-IQ-BOX
is synchronized either external or internally. Test mode CPRI REC uses the reference
clock embedded in the CPRI link.
"REF IN"
CPRI RE test setup with a connected R&S instrument.
The R&S
EX-IQ-BOX synchronizes the CPRI communication link with
the reference signal provided by an R&S instrument. The 10 MHz signal
is fed to the BNC connector REF IN on the back of the R&S
EX-IQ-BOX.
"Internal"
CPRI RE test setup, if the R&S
EX-IQ-BOX is working stand-alone.
The R&S
EX-IQ-BOX uses its internal reference oscillator for synchro-
nization.
"Clock Recovery"
CPRI REC test mode.
The reference clock is extracted from the CPRI link. This selection is
mandatory in a CPRI REC test setup, since the R&S
EX-IQ-BOX oper-
ates in CPRI slave mode.
Remote command:
Clock Synthesis Locked
Indicates red, if the main PLL of the R&S
EX-IQ-BOX is unlocked. This state is funda-
mental and must be locked in every operating mode of the R&S
EX-IQ-BOX.
Remote command:
Clock Recovery Locked
Indicates red, if clock recovery is unlocked. Clock recovery must be locked in CPRI REC
test mode.
Remote command:
10MHz Reference Output Locked
Turns red, if the reference clock output is not available.
CPRI
Summary of Contents for EX-IQ-BOX
Page 147: ...Protocol Settings R S EX IQ BOX 132 User Manual 1409 5570 32 05 CPRI...
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