Appeal No. 97-2763
Application No. 08/580,790
through 8.
The disclosed invention relates to a method for
monitoring virtual connections within a digital
telecommunications network that is formed of exchanges.
Claim 1 is illustrative of the claimed invention, and it
reads as follows:
1. A method for monitoring virtual connections within a
digital telecommunication network that is formed of exchanges,
connected by transmission lines, operating in asynchronous
transfer mode via which information transmitted in synchronous
transfer mode is also switchable, wherein transmission
monitoring cells, that contain a regular error-detecting code
word and that may contain a sequence identifier as well as a
particular about a length of an information cell block, are
respectively allocated to information cell blocks to be
transmitted, each of the monitoring cells having a header part
and an information part and being allocated to a respective
information cell block at an originating location of
transmission links carrying the virtual connections, the
error-detecting code word being formed using a totality of the
information cell blocks, wherein an evaluation, on the basis
whereof an information falsification is recognizable,
respectively occurs at an end point of an appertaining
transmission link by renewed formation of a further error-
detecting code word and by comparison thereof to the regular
error-detecting code word transmitted from the originating
location, and wherein a message at least to the originating
location of the appertaining transmision link is undertaken in
case of a recognized information falsification, comprising the
steps of:
forming error-detecting code words at an access boundary
of a respective exchange upon exclusive acquisition of
information parts of information cells of information cell
blocks;
2
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