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PSI-MODEM-SHDSL/ETH, TC ETH EXTENDER
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PHOENIX CONTACT 104273_en_01
Informing Ethernet device about aborted SHDSL (transparent link)
With a point-to-point connection, you can switch on the function "transparent link" via the
configuration software.
Figure 3-1 PSI-CONF: Transparent link
This function ensures that during an interruption of the SHDSL connection, the Ethernet
connection on the network side is also interrupted. This process takes around 600 ms.
If however the Ethernet connection is interrupted on the network side instead of on the
SHDSL path, then this information is not transmitted via the SHDSL path to the other net-
work. This behavior is advantageous if the devices are used within redundant structures.
Without this function the Ethernet connection remains unchanged on the network side when
the SHDSL connection is interrupted.
An Ethernet connection is established only if at least one SHDSL path is ready for data
transmission. This can contribute to quicker re-establishment of the connection when a re-
dundant transmission path is in operation in parallel and the redundancy is controlled exter-
nally, e.g. via STP/RSTP.
Figure 3-2 Transparent link
Preferred forwarding of high-priority data
When forwarding Ethernet telegrams, it is ensured for as long as possible that high-priority
data (e.g. process data) will not be affected by a bandwidth bottleneck. This means that
telegrams are forwarded according to the strict priority method in a PROFINET-compliant
manner.
SHDSL