3-50
Performance Tests
SPDH Receiver Monitor Levels (Options UKJ, [USA], UKL, [USC], UKN,
[USE])
SPDH Receiver Monitor Levels (Options UKJ, [USA],
UKL, [USC], UKN, [USE])
NOTE An SPDH Tx Module must be fitted for this test - see Appendix B.
Specifications
Description
The signal from the HP 37717C PDH Transmitter is applied to the PDH Receiver
after attenuating by an amount equal to the selected Receiver Flat Loss plus the
specified Cable Loss. The Flat Loss is obtained by inserting a number of 50Ω, fixed
attenuators in series with a 75/50Ω Matching Pad at one end and a 50/75Ω
Matching Pad at the other end. The loss of the two Matching Pads is included in the
overall attenuation equation. The Cable Loss is supplied by inserting the correct
Cable Simulators for each bit rate in the attenuation path.
Equipment Required
Bit Rate Nominal Loss Equalization at 1/2 Bit Rate
2.048 Mb/s 20, 26, 30dB 3dB
8.448 Mb/s 20, 26, 30dB 3dB
34.368 Mb/s 20, 26dB 6dB
139.264 Mb/s 20, 26dB 6dB
Table 3- 2
Cable Simulator #1 : 80 metres (262 ft) of 75Ω coaxial cable (8120-0049)
Cable Simulator #2 : 60 metres (197 ft) of 75Ω coaxial cable (8120-0049)
Cable Simulator #3 : 70 metres (230 ft) of 75Ω coaxial cable (8120-0049)
Cable Simulator #4 : 30 metres (98 ft) of 75Ω coaxial cable (8120-0049)
To Next Page
Loading...
Need help?
General
