Datatek DT-6061 Руководство пользователя - Страница 6

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1.4 IP-PAD A
PPLICATION
The configuration of the X.25 application takes place on its OA&M port. That is TCP port number
10000 + its instance number in the DT-6061.
The configuration required for the IP-PAD application is:
•
Per application: This is the TCP port number to be used as a base for a range of TCP ports
the application instance shall use. The synchronous transport to the X.25 network element
occurs at offset zero to this base TCP port number. The individual X.25 virtual circuits are
identified by the base TCP port number plus the X.25 virtual circuit port number.
•
Per X.25 line: These consist the LAPB transmission window size and other link layer
parameters.
•
Per X.25 VCC: These consist of the PAD profile associated with the VCC, the window size to
be used for transmission in the X.25 packet layer, and other parameters associated on a per
virtual circuit basis.
The Per X.25 Line Configuration parameters are as follows:
Parameter
2
X.25 Logical Line Type
Number of X.25 VCs
3
Default Max Packet Size
LAPB Tx Window Size
Waiting ACK Time (T1)
Maximum Attempts to complete a Transmission
(N2)
Action when N2 Count Exceeded
Action when DISC received
The per VCC configuration parameters are as follows:
Parameter
Packet Layer Window
PAD Inactivity Timer (T)
Profile ID
2
The IP-PAD application currently supports only the DCE end of the X.25 connection. All
Network Elements known to date are DTE.
3
The 1980 standard provided for 128 byte packet sizes. The 1984 standard increased the
maximum size to 256 bytes. Later standards have optionally increased that number. However,
nearly all implementations of X.25 follow the 1984 standard, and it is considered the default for all
implementations known to date.
4
The IP-PAD application currently supports only X.25 PVCs. As such a DISC action is not
defined.
5
Receipt of a DISC on an X.25 PVC is not valid. This is not currently supported.
11/01/00
C
ONFIGURATION
Values
DTE, DCE
128, 256
1-7
1-60
1-255
4
Disc, reset.
5
Disc, reset.
Values
1-7
2-20, OFF
Value, Transparent
Datatek Applications Inc.
Default
DCE
16
256
2
3
7
Reset
Reset
Default
Units
2
Packets
OFF
Seconds
Transparent
Units
Bytes
Frames
Seconds
Seconds
6