Operation Manual

ARGUS
74
A
RGUS 125
10.4 X.31 Test
The ARGUS will either perform a “Manual X.31 Test” or an “Automatic X.31 Test”:
In the case of an automatic test, the ARGUS will first set up the D-channel connection and
then begin setting up the X.31 connection. Afterwards, the ARGUS will automatically clear
the connection and display the results.
In the case of a manual test, the ARGUS will set up a D-channel connection and an X.31
connection. The duration of this connection is determined by the user (or the opposing
end). For the duration of the connection, the ARGUS will repeatedly send a predefined data
packet. The ARGUS will count all of the data packets sent and received and will display
(where possible) the contents of the data packets received.
10.4.1 X.31 Automatic, D-channel test
The “X.31 Automatic, D-channel” test consists of two steps:
First step:
The ARGUS tests whether it is possible to access the X.25 service via the D-channel on
the BRI access under test. The ARGUS sequentially checks all the TEIs from 0 to 63. All
the TEIs with which the X.31 service is possible on Layer 2 will be displayed.
Second step:
For each TEI with which X.31 is possible on Layer 2, a CALL_REQ packet will be sent and
then the ARGUS will wait for an answer. Beforehand, the ARGUS will request the entry of
the X.25 access number, which will be saved in speed-dialling memory under X.31 test
number (see “Saving Call Numbers” on page 133). With the entry of the X.25 access
number, you can - if you wish - select a logical channel (LCN) other than the default.