3-10
Performance Tests
PDH/DSn Internal Transmitter Clock Accuracy & Offset
PDH/DSn Internal Transmitter Clock Accuracy & Offset
Specifications
NOTE The Rates available are dependent on the HP 37718A/19A option.
Description
This test verifies that the PDH transmit data rates are within limits.
These limits assume the instrument is within the calibration cycle. The
Frequency Offset capability (deviation from Standard Bit Rate) is also
checked.
For E1 to E4 a Frequency Counter connected to the PDH/DSn Signal Out
port measures the data rate on an "all ones" pattern. This gives an
indirect measure of the internal transmitter clock frequency as the data
is clocked by the internal clock oscillator. Because the Frequency
Counter triggers from the positive pulses only, the frequency count will,
for Ternary signals E1, E2 & E3, be half the selected data rate.
For DS-1 and DS-3 the Frequency Counter is connected to the CLOCK
OUT port.
Equipment Required
Rate Frequency
E4
139.264 MHz ± 4.5 ppm
E3
34.368 MHz ± 4.5 ppm
E2
8.448 MHz ±4.5 ppm
E1
2.048 MHz ±4.5 ppm
DS1
1.544 MHz ±4.5 ppm
DS3
44.736 MHz ±4.5 ppm
Frequency Counter : HP 5335A Option 010
75Ω Termination : HP 15522-80010
T Connector : HP 1250-0781
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