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158 Chapter 5
Defining Connectivity Components
Defining Link Stations
• If you are configuring a primary switched outgoing
link station, and you do not know the poll address of
the remote secondary with which you wish to
communicate, you can specify a poll address of 0xFF
on the primary. This value enables the node to
accept responses from a secondary, regardless of the
poll address it has configured. 0xFF is not a valid
address for a nonprimary link or a link that is not
switched outgoing.
• If you are using a multi-drop configuration, all the
secondary link stations that communicate with the
same primary must have different poll addresses.
The poll addresses at both ends of the link must match.
Contact your SNA network planner if you do not know
the address configured at the remote system.
On a VTAM host, the poll address is configured as the
ADDR= parameter in the VTAM PU definition.
On an AS/400 system, the poll address is the STNADR
parameter of the Line Description.
Line encoding
The line encoding used on your SDLC line. In the U.S.,
this is usually NRZ. In Europe, this is usually NRZI. If
you set this incorrectly, you will find that the frames
being received are all discarded and do not appear in
any trace.
On a switched outgoing port, the line encoding can be
set independently for each link station. For other types
of ports, the line encoding setting is taken from the
port, so this field does not apply.
Dial string
An ASCII string to be sent to your modem in order to
make it initiate the outgoing call. The dial string is
required for a switched outgoing port. Refer to the
documentation for your modem for more details. (Some
modems do not support dial strings; in such cases, this
field does not appear.)
For switched incoming ports, the dial string is
configured on the port. For leased ports, this field does
not apply.