HP 37717C, Calibration Manual, Page: 180 / 399

3-71
Performance Tests
PDH Error Output (Options UKK, [USB])
PDH Error Output (Options UKK, [USB])
N OT E A PDH Tx Module must be fitted for this test - see Appendix B.
Specifications
Description
The HP 37717C Transmitter generates a 2Mb/s Bit stream with injected errors.
These errors are counted by the receiver and the signal appearing at the Error Output
Port is checked to verify that error pulses are present at the correct rate. The Error
Output signal is also checked with Pattern Sync Loss to verify that pulses are still
present at 16 Clock Period intervals.
Equipment Required
Procedure
1. Recall the HP 37717C DEFAULT SETTINGS as shown on 3-2.
2. Connect the HP 37717C SIGNAL OUT 75
Ω
port to the SIGNAL IN 75
Ω
port.
3. Connect the HP 37717C ERROR OUT port to the Oscilloscope Channel 1 via the
Blocking Capacitor (terminate scope in 1M
Ω
).
4. Select SIGNAL [2 Mb/s] on the and displays.
Output 1 pulse per error
Output During Sync Loss Continuous pulses at 16 Clock
period intervals
Pulse Width Nominal 8 clock periods
Level Nominal ECL
Oscilloscope : HP 54503A
Blocking Capacitor : HP 10240B
TRANSMIT
RECEIVE