Cabletron Systems FRM User Manual - page 281
St atus Displays
19-9
X.25 Line Monitor
The X.25 line monitor is used to monitor X.25, SDLC, BSC, and async ports. The fol-
lowing figure shows an example:
Figure 19-6 X.25 Line Monitor Display
[C],[E]
from Main Menu
On each line:
●
The leftmost field shows the time, to hundredths of a second.
●
The next field displays
I
(Incoming) or
O
(Outgoing). (Outgoing packets are also
displayed in reverse video.)
●
The next field identifies the packet type.
●
D
,
M
, or
Q
appears between the packet type and the LCN field if the D, M, or Q
bit is turned on in the packet.
●
LCN
is the logical channel of a data session.
●
PR
is the packet receive sequence number.
●
PS
is the packet send sequence number.
●
LNG
is the length of the data in bytes.
●
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.)
X.25 Port LAPB Trace Example
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
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
LC N 4071 PR 6 PS
09:23:06:05 O
R R
LC N 4072 PR 6
PS
09:23:06:18 O
D ATA LC N 4072 PR 6
PS 6 LNG 1024 :557586707555090G85
09:23:07:13 O
D ATA LC N 4071 PR 6
PS 7 LNG 1024 :54389450758090G859