HP 37718A Installation And Verification Manual page 102

N OTE
Performance Tests
External Clock/Data Reference Inputs & Clock Reference Output
16 Check that the
RESULTS
Alarm LEDS are off. Press
17 Disconnect the PDH/DSn Test Set, 75
Ω
75 2M REF IN Port.
18 Connect the PDH/DSn Test Set, 120
Ω
120 2M REF IN Port.
19 Change the PDH O/P termination to 120
and the HP 37718A/19A.
20 Press
RESULTS
19A.
21 Check that the
RESULTS
Alarm LEDS are off. Press
STM-1/STS-3 Receive Data
22 Disconnect the PDH/DSn Test Set Data Output from the HP 37718A/
Ω
19A, 120 2M REF IN port.
23 Disconnect the 52/155 Mb/s DATA OUT port from the 52/155 Mb/s
DATA IN port
24 Select CLOCK SYNC [STM-1/STS-3 RECEIVE] ON THE HP 37718A/
19A display.
TRANSMIT
25 The SDH Clock Loss Alarm led should be lit on the HP 37718A/19A.
26 Set the Synthesizer frequency to 77.760MHz and amplitude to
+10dBm.
27 Connect the Synthesizer to the 75
28 Ensure that the SDH/SONET Clock Loss Alarm Led is not lit.
As the signal is unframed the LOF/OOF etc. alarms will be on.
10 MHz Reference
29 Select CLOCK SYNC [10MHz REF] ON THE HP 37718A/19A
display.
TRANSMIT
30 The SDH/SONET Clock Loss Alarm led should be lit on the HP
37718A/19A.
31 Set the Synthesizer frequency to 10.000MHz and amplitude to
+10dBm.
3-62
Display reads NO TROUBLE and all the
RUN/STOP
Ω
then
TROUBLE SCAN
Display reads NO TROUBLE and all the
RUN/STOP
Ω
52/155 Mb/s DATA IN port.
to halt the measurement.
Ω
2 Mb/s PDH Output from the
2 Mb/s PDH Output to the
Ω
on the PDH/DSn Test Set
on the HP 37718A/
RUN/STOP
to halt the measurement.