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X.25 Line Monitor
X.25 Port LAPB Trace Example
Status Displays
The X.25 line monitor is used to monitor X.25, SDLC, BSC, and async ports. The fol-
lowing figure shows an example:
09:23:05:16 I
DATA LC N 4072 PR 4 PS 4 LNG 1024 :56686520756190G801
09:23:05:27 I
DATA LC N 4072 PR 4 PS 5 LNG 1024 :46686521255190G811
09:23:05:27 I
RR
09:23:06:05 O
R R
09:23:06:18 O
D ATA LC N 4072 PR 6
09:23:07:13 O
D ATA LC N 4071 PR 6
Figure 19-6 X.25 Line Monitor Display
On each line:
The leftmost field shows the time, to hundredths of a second.
The next field displays
displayed in reverse video.)
The next field identifies the packet type.
,
, or
appears between the packet type and the LCN field if the D, M, or Q
D
M
Q
bit is turned on in the packet.
is the logical channel of a data session.
LCN
is the packet receive sequence number.
PR
is the packet send sequence number.
PS
is the length of the data in bytes.
LNG
The field to the right of the colon contains the data in a data packet. (Data
exceeding the screen width is displayed on the next line.)
The following is an example of an X.25 port LAPB trace of Modulo 128 link acti-
vation:
01
SABME P
01
UA
F
03
I
N(R) 0 N(S) 0 (0005):1000FB0700
01
I
N(R) 1 N(S) 0 (0005):1000FB8700
01
RR
N(R) 1
03
RR
P N(R) 1
LC N 4071 PR 6 PS
LC N 4072 PR 6
PS
PS 6 LNG 1024 :557586707555090G85
PS 7 LNG 1024 :54389450758090G859
(Incoming) or
(Outgoing). (Outgoing packets are also
I
O
[C],[E]
from Main Menu
19-9
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