Teledyne LeCroy IBTrainer - IBTrainer Users Manual - Manual (Page 14)

Getting Started with the IBTrainer Performing a First Test
14
CATC IBTrainer InfiniBand Exerciser, August 2002
Controlling the Link State of the IBTrainer
The status bar shows you the current link state of the IBTrainer.
If the link state does not correspond to the desired transmission packet,
you can set the link state by selecting Generator>Link State. The Link
State dialog box opens.
This dialog box consists of two groups, reflecting the conventions given
in the InfiniBand specification:
• Link Training State Machine, corresponding to the Physical layer
Link initialization, configuration, and link error recovery operations
are performed by the link training state machine. The primary states
for the link training state machine that you can set in the Link State
dialog box are Disabled, Sleep or Poll.
• Link State Machine, corresponding to the Link layer
As described in the InfiniBand specification, the link layer handles the
sending and receiving of data across the links at the packet level. The
specification uses state machines to define the logical operation of the
link layer. The different stages of the link state machine that you can
set in the Link State dialog box are Down, Arm or Active.
The InfiniBand specification requires that the current link states of two
InfiniBand devices connected together must be identical before the link
state of one of the devices can be set a level higher. Here, you can
activate AutoNegotiate to let the IBTrainer handle the intermediate
steps for reaching the desired link state for both the IBTrainer and the
DUT, provided that no Subnet Manager is attached to the network.