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Issue 2 - 07/00 7-15
Capturing & Analysing Protocol Information - Section 3
Understanding the simple decode
The simple decode shows basic information about Layer 1,
Layer 2 and Layer 3 events, with a timestamp at the top right
of the screen.
The direction of each message is indicated by an arrow. For
example, in the illustration on the previous page a Connect
message has been sent from the NT to the TE.
For a Basic Rate link, the display shows Layer 1 Info states for
the Basic Rate S interface, Layer 2 frame messages (SABME,
UA, RR, etc), and Layer 3 messages. For a Primary Rate link,
instead of Layer 1 Info states the display shows Layer 1 alarms
as they occur.
Extended Decode
The extended decode display allows you to look at a message
that is displayed in the
Decode
window in more detail.
You can use the extended decode display when:
• you are reviewing a monitor or capture session
that you have stored in aurora
Sonata
’s memory
• you are viewing the decode window for a call
that is connected
Viewing the extended decode display
When the
Decode
window is displayed:
-1-
If the
Decode
window is not the active
window, press .
-2-
If you are viewing the realtime decode window,
freeze the decode, by pressing the
Freeze
function key.
-3-
Move the cursor to the message you want to
look at by pressing and .