PAD Select
This command establishes an X.25 virtual call connection through the ISDN packet handler to a remote host or device. The contents of the PAD select command determine the contents of the X.25 Call Request packet. The format can be in any of following three forms:
<facility request block> - <address block> <call user data>
<facility request block> - <call user data>
<address block> <call user data>
The facility request block permits the user to request special services from the ISDN network. If more than one facility is specified, a comma must separate each facility. The end of the facility request block must be followed by the hyphen character.
The address block specifies the called Network User Address (NUA). The address cannot exceed 15 characters in length. Abbreviated or multiple addresses are not supported.
The call user data field cannot exceed 12 characters in length (including spaces) and must be preceded by either the P or D character. Carriage returns and the + character are not considered part of the user data field because they are treated as PAD command delimiters.
Response:
COM - Indicates the virtual call is established.
ERR - Indicates the PAD is in an unknown mode that cannot allow the PAD select command, the PAD has been initialized in the
•The facilities block is not followed by the - character.
•The CUG facility is requested and two decimal digits are not specified.
•The RPOA facility is requested and four decimal digits are not specified.
•The address block length exceeded 15 characters.
•The call user data block is not preceded by the P or D character.
•The call user data block length exceeded 12 characters.
•An invalid facility is requested as the first facility in the facility request block.
CLR xxx - Indicates the attempted call has cleared. The xxx is the ASCII character cause code which specifies the reason the call attempt cleared (see PAD Clear Service Signals).
UTA220/UTA220k |
