EXFO FTB-1, User Manual

Page: 364 / 675

Test Results
352
FTB-700G/800 Series
ISDN Logger
ISDN Logger
The ISDN Logger page displays color-coded ISDN messages and pass/fail
verdict.
From the
Test
menu, tap
Results
, and the
ISDN Logger
tab.

Sort By selects the event sorting order: ID/Time (default), Message
Type
,
Dir.
,
Call Ref.
,
Ch#
, or
Call Type
.

Filter selects the filtering criterion: All (default), Layer 2 , or Layer 3 .

Time Mode
selects the time representation mode. The
Time Mode
for
the ISDN Logger and the Alarms/Errors Logger is coupled.

Relative
displays the time relative to the beginning of the test or
the last reset. The time format is Dd HH:MM:SS.

Absolute
(default) displays the date and time the test has started.
The time format depends upon the platform time which will be
either
MM/DD HH:MM:SS
for 24 hours time format or
MM/DD HH:MM:SS <AM/PM> for 12 hours time format.

Clear Logger
button clears the logger entries.

Message Type column indicates the type of message which are
classified into Layer 2 and Layer 3 messages as follows.
Layer 2 messages

SABME
(Set Asynchronous Balanced Mode Extended) command is
used to place the addressed user side or network side into a
modulo 128 multiple frame acknowledged operation.

UA (Unnumbered Acknowledgment) response is used by a data
link layer to acknowledge the receipt and acceptance of the
mode-setting commands (SABME or DISC).

I
(Information) command is used to transfer, across a data link
connection, sequentially numbered frames containing information
fields provided by Layer 3. Used while multiple frame operation is
in effect on point-to-point data link.