aurora
Sonata
Hand Held ISDN Tester—User Guide
7-20 427869
Understanding the standard decode
The standard decode shows the name of each message, with a
timestamp and the direction of the message. It decodes all
incoming and outgoing ISDN messages and Layer 1 events.
The output is in the form of a Layer 2 and Layer 3 partial
decode of the protocol information, with the message
information broken down into Layer 2 and Layer 3 parts.
The Layer 2 decode is displayed first, followed by the decode
of the Layer 3 part of the message, if there is one. Finally,
there is a hexadecimal print of the entire message.
For a Basic Rate link, Layer 1 Info State information is
provided by the S interface for the standard decode output.
For the 2B1Q U interface, the decode provides EOC and
FEBE/NEBE information. For a Primary Rate link, Layer 1
alarms are shown.
Decode output—Example
The tables on the following pages show a typical protocol
decode for the beginning of a call setup on a Basic Rate link.
The first table shows the initial output, which displays the
software release, current date and time, the source of the
decode (e.g. TE or NT), the protocol in use and the current
setup of aurora
Sonata
.
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