Datatek DT-4180 - Manual (Page 59)

9 4 8 0 , 4 1 8 0 , 4 2 8 0 , 4 2 8 4 4 0 0 0 X A U s e r M a n u a l
04/09/09
59
generate a call clear transaction. If the X.25 device clears the call, the TCP connection
will also be dropped.
The
vcwin= specifies the packet layer window size to be used
for transmission purposes on the affected VCs. The valid values are one through seven
inclusive. The VC must have been previously specified on the command line.
The
vcpkt=< 128 | 256 | 512 | 1024 > specifies the packet size boundary upon which a
packet is generated when the selected forwarding condition is not met. Any such packet
will have the “More” bit set to indicate the transaction is not complete.
The
pvcreset= option specifies the operation of a PVC when a connection
is made. When set to ON , the PVC is issued a RESET upon a user connection. When
set to OFF , the PVC continues with it’s previous state. Some legacy devices cannot
tolerate a PVC RESET and this option allows interoperability. The default is to have
RESET enabled (ON).
The
pvcrstlnk=< OFF | CONSTDCD | SWDCD > option specifies the operation of the
link supporting the PVC when a connection is made. When set to any value other than
OFF , the entire link is issued a RESTART upon a connection to the PVC. The PVC itself
may also get a RESET depending on the setting of the pvcreset option. When set to
OFF , the link behaves per the relevant (either X.25 or BX.25) specification and no
RESTART is issued at user connect. The pvcrstlnk=SWDCD option also switches the
DCD lead as the BX.25 link layer is controlled. This yields a more effective simulation of
a dynamic modem connection as is required by some legacy devices. Some switches
(i.e. #5ESS) cannot have the DCD cycled as it will cause the link to not restart. The
pvcrstlnk=CONSTDCD should be used in that situation as it will maintain the assertion
of the DCD lead. The pvcrstlnk option is provided strictly for interoperability with select
legacy devices. As a general rule, the pvcrstlnk feature should remain in the OFF
condition unless specifically desired. The default is the OFF condition.
The
svctclass=< NONE | Throughput > option specifies a throughput class declared on
X.25 call connect, and call accept packets. The throughput class is the same in both
transmit and receive directions. As a general rule, it should always be set to
NONE such
that no limiting throughput class is established. All specification allowable values for
throughput class are supported. These range from 75bps to 48000bps inclusive. The
option is provided for interface to devices that require a throughput class to be explicitly
negotiated.
The
padecho=< ON | OFF > refers to reference #2 in the X.3 parameter list. When set
to OFF, the PAD will not echo characters back to the IP endpoint. When set to the value
of ON, all characters are to be echoed back to the IP source.
The
paderase=< NONE | BS | > option specifies reference #16 in the X.3
parameter list. It is used with manual telnet connections to an X.25 VC. It sets the buffer
editing “erase” character. When the special “erase” character is received by the X25PAD
for a specific virtual circuit, the previous character in the packet accumulation buffer is
deleted. If the
padecho option was also enabled, a “Backspace Blank Backspace”