Optional software for the ANT-5
Page 88 Acterna ANT-5
5.2 PDH Mux/DeMux
5.2.1 PDH Mux Tx
SDH and PDH network elements process PDH
signals from various hierarchies. Complex,
interlocking signal paths can result, particularly
within modern SDH cross-connects. Here, the
ANT-5 can be used to test complex switching
functions.
The PDH Mux feature allows the generation of
ITU-T Mux chains from E1 to E4, starting and
finishing at any intermediate rate with the
exception of E2 (i.e. E1/E3, E1/E4, E3/E4).
The generation feature allows the insertion of alarms and errors at all levels in the
chain (including E2).
Selecting NFAS setup… opens the NFAS Setup Tx panel. (This is available only
when the 2Mbit/s (E1) signal structure has been selected for transmission).
Note: The Tx hierarchy type should be set to PDH to activate the PDH Mux.
5.2.2 Sa Bit generation Tx
The Spare (Sa) bits in the NFAS (Not Frame
Alignment Signals) of an E1 frame are
available for specific purposes, and can be
used, for example, to provide a remote loop
back of a far end tributary. Bits can be used to
control far end equipment for testing, typically
using a loop-back.
The A-Bit (indicating the remote alarm) and
spare Sa bits (Sa4 – Sa8) can be set. For
each Sa bit it is possible to set 8 binary values. These will be transmitted in
consecutive NFAS.
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