HP-UX SNAplus2 R7 Administration Guide

Defining Connectivity Components
Defining Link Stations
The link station can be used for both independent and dependent LU traffic. For this option, you
must supply values for the fields described in Section 5.2.1,
Link Station Configuration Parameters and
Section 5.2.1, Link Station Configuration Parameters, in addition to those described in this section.
Independent only
The link station can be used only for independent LU traffic. For this option, you must supply values
for the fields described in Section 5.2.1, Link Station Configuration Parameters, in addition to those
described in this section.
Dependent only
The link station can be used only for dependent LU traffic. For this option, you must supply values
for the fields described in Section 5.2.1, Link Station Configuration Parameters, in addition to those
described in this section.
You also need to provide addressing information for contacting the adjacent node. The type of addressing information
needed depends on the DLC type of the port. If you do not supply an address for the remote node, the link station
acts as a nonselective listening link station, accepting incoming calls from any remote node.
Additional Link Station Parameters for SDLC
Poll address
The poll address of the remote station. Specify the address as a two-digit (one-byte) hex value, typically
starting at C1. A primary link station polls the remote station using this value. A secondary link station
responds to polling with this value. The poll address is entered differently depending on the link role:
• If the link is a point-to-point link (not multi-drop), the address C1 is normally used.
• If the parent port for this link is switched incoming, the poll address is configured on the port and cannot
be configured independently for each link station.
• 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 (NRZor NRZI) used on your SDLC line. 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.
Duplex setting
Specify Half Duplex or Full Duplex, depending on the capabilities of your SDLC cable and modems.
On a switched outgoing port, the duplex setting can be set independently for each link station. For other port
types the duplex setting is configured on 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.)
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