Defining Connectivity Components

Defining Ports, DLCs, and Connection Networks

Select a value that describes the role of the local node for link stations defined on this port. In SDLC communication, one end manages the link and is called the primary link station. The other end is the secondary link station.

Use one of the following values for this field:

Secondary

The other end of the link is to be the controller and the remote system is configured to be primary. This is nearly always the case if you are configuring a link to a host system.

Primary

This port is to act as the SDLC controller of the link, and the remote system is configured to be secondary.

Negotiable

For maximum flexibility, this setting enables the two ends to negotiate which end performs the primary role. Choose this value if you do not know which role is configured for the remote system.

You can use this setting for a peer link, but be aware that negotiating the role causes a short delay when the link is activated.

Primary Multi-drop

The link is leased and this port is to act as controller of a multi-drop link to several secondary nodes.

Use this setting when you want to configure several link stations from the local node to different remote nodes (for example, for links to downstream nodes). Each of these other nodes must be configured as secondary, and you must be using a leased line.

Secondary Multi-PU

The local port is one of the secondary stations on a multi-drop link controlled by the port on the remote system.

If you configure a port for a switched incoming or leased line, you also need to configure the following items:

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Chapter 5