3-55
Performance Tests
External 2Mb/s Mux/Demux (Options UKJ, [USA], UKN, [USA])
External 2Mb/s Mux/Demux (Options UKJ, [USA],
UKN, [USA])
Specifications
Multiplexer:
De-Multiplexer
Description
This test verifies operation of the SPDH Mux and demux hardware and confirms the
output characteristics of the external demux port on the SPDH Receiver.
The PDH Test Set is set up to transmit an Unbalanced 75Ω unframed 2Mb/s pattern.
This is applied to the HP 37717C INSERT Port. The 2Mb/s signal is multiplexed
into a 140Mb/s data stream. The HP 37717C transmitter and receiver are looped.
The unframed 2Mb/s signal is Demultiplexed from the 140Mb/s data stream to the
HP 37717C DROP port. The DROP Port signal is then applied to the PDH Test Set
and a BER test is performed to verify the integrity of the 2 Mb/s signal.
The output from the DROP Port is then applied to an oscilloscope, and the
waveform characteristics are checked to ensure they meet specifications.
Frequency 2.048 Mb/s
Interface Meets ITU Rec. G.703, for unbalanced coaxial
pair.HDB3 line coding only.
Source Accepts a 2 Mb/s signal conforming to ITU Rec.
G.703, Unbalanced only.
Frequency 2.048 Mb/s
Interface Meets section 6 of ITU Rec. G.703, for unbalanced
coaxial pair. HDB3 line coding only.
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