Pdh/Dsn Internal Transmitter Clock Accuracy & Offset; Specifications; Description; Equipment Required - HP 37718A Installation And Verification Manual

N OTE
Performance Tests
PDH/DSn Internal Transmitter Clock Accuracy & Offset
PDH/DSn Internal Transmitter Clock Accuracy & Offset
Specifications
Rate
E4
E3
E2
E1
DS1
DS3
The Rates available are dependent on the HP37718A/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

Frequency Counter
75Ω Termination
T Connector
3-8
Frequency
±
139.264 MHz 4.5 ppm
±
34.368 MHz 4.5 ppm
±
8.448 MHz 4.5 ppm
±
2.048 MHz 4.5 ppm
±
1.544 MHz 4.5 ppm
±
44.736 MHz 4.5 ppm
: HP 5335A Option 010
: HP 15522-80010
: HP 1250-0781