PDH MUX/DEMUX
ANT-20/ANT-20E
I-2
Introduction
2
Testing switch and sensor functions
Switch functions
SDH and PDH network elements process the PDH signals of various hierarchy levels.
Complex, interleaved signal paths occur, particularly in modern SDH network nodes (cross-
connects). The linking of the PDH multiplex chain to the SDH mapping functions in the ANT-20
makes the instrument ideal for testing complex switching functions. Since the ANT-20 can
generate and evaluate structured signals right down to the 64 kbit/s level, it can test switching
functions on all hierarchy levels from 140 Mbit/s to 64 kbit/s. Tests can be performed between
two SDH ports or between an SDH and a PDH port.
Alarm sensor test
Comprehensive facilities for inserting errors into the PDH signal at various hierarchy levels
allow testing of the monitor functions built in to the network elements. This is particularly useful
during installation work, as the network management systems are dependent on the correct
functioning of these sensors during subsequent operation.
3
In-service monitoring of tributary channels
The demultiplex function provides access to the tributary channels right down to the 64 kbit/s
level. This permits pinpoint in-service monitoring of individual channels in PDH signals and in
SDH signals when the appropriate mappings are employed.
