High-speed link and remote I/O

HSL/RIO resources are normally configured in loops with the system unit having an HSL/RIO controller resource that handles routing of the data between the system processor and the system I/O busses. System I/O busses connect to the loop with HSL I/O adapter or RIO adapter resources. When you view the logical resources of a High Speed Link loop using hardware service manager, you will see:

• HSL controller resources, sometimes called local high-speed link network interface controllers (local HSL NICs).
• HSL controller resources of other processing units in the RIO loop, called remote high-speed link network interface controllers (remote HSL NICs).
• HSL loop resources under the controller listed above the loop.
• HSL I/O adapter resources under the loop listed above the adapters.
• The System bus adapter resources under the HSL I/O adapter resources option. From this level and below, I/O resources appear the same way as they do in the System bus resources option from Display Logical Resources in the Hardware Service Manager menu.

Loops start and end on the same port pair of an HSL/RIO controller, for example, the A0 and A1 ports.

When you view an HSL/RIO controller or adapter resource in HSM, you can select Display detail option to view the status and information about the links on that resource.

There are two ports on each HSL/RIO resource. The Leading link usually refers to the connection between the resource's 0 port to the next HSL/RIO resource on the loop. The Trailing link usually refers to the connection between the resource's 1 port to the next HSL/RIO resource on the loop.

In some cases a link is an internal connection in a system unit or expansion unit. In that case the link will be labeled as "internal" and there will not be port label information.

When port pairs are on a system unit they are labeled on the frame as A0 and A1; B0 and B1; and so on, or as –Tx. When port pairs are on an expansion unit they are labeled on the frame as 00 and 01, or as Tx.