Westermo MR Series - Manual (Page 378)

378 6622-3201
Web Interface and Command Line Reference Guide www.westermo.com
Example
CALL R,G12,NMYNUI-56512120DHello
places a call to address 56512120 using reverse charging and specifying Closed User Group 12. The
string “MYNUI” is your Network User Identity and the string “Hello” appears in the user data field
of the call packet.
Note:
The particular facilities that are available will vary between X.25 service providers.
If a CALL command is issued without the address parameter, it is assumed that you wish to go back
on-line to a previously established call (having used the PAD recall facility to temporarily return to
the PAD> prompt).
Fast select (ISDN B-channel only)
When the standard Fast select facility is requested using the “F” facility code, the call packet
gen erated by the CALL command is extended to allow the inclusion of up to 124 bytes of user
data. For example:
CALL F-1234567890DThis DATA sent with call packet
would cause an X.25 CALL packet to be sent using the Fast select facility including the mes-
sage “This DATA sent with call packet” (the Carriage Return used to enter the command is not
transmit ted). Without the inclusion of the Fast select facility code, only the first 12 characters
would be sent.
When a Fast select CALL has been made the PAD accepts an extended format response from
the called address. This response, consisting of up to 124 bytes of user data, may be appended to
the returning call accepted or call clear packet. When one of these packets is received, the user
data is extracted and passed from the PAD to the terminal immediately prior to the “CLR DTE .
. .” mes sage in the case of a call clear packet or “CON COM” message in case of a call accepted
packet.
When a restricted response Fast select call has been made using the Q facility code, the call
packet indicates that a full connection is not required so that any response to the user data in
the CALL packet should be returned in a call clear packet.
When the PAD receives an incoming call specifying Fast select, the call is indicated to the termi-
nal in the normal way. For example:
IC 1234567890 FAC: Q,W:2 COM
would indicate that an incoming call had been received requesting Restricted response fast
select and a window size of 2. The user (or system) then has 15 seconds in which to pass up
to 124 bytes of data to the PAD to be included in the clear indication packet that is sent in
response to the call.
The PAD does NOT differentiate between standard and restricted response Fast select on
incom ing calls and, consequently, will always respond with a clear indication.
Network User Identity (NUI)
The N facility code allows you to include your Network User Identity in the call packet. For
security reasons the PAD echoes each character as an asterisk (*) during the entry of an NUI.
Some X.25 services use the NUI field to pass both a username and password for validation.
For example, if your Username is MACDONALD and your password is ASDF, a typical CALL
com mand would have the format:
CALL NMACDONA;ASDF-56512120
where the “;” is used to separate the username from the password.