Defining the Current Status

The read-only parameters described in TABLE 2 explain the operational mode of the interface. Based on the value of these parameters, you can determine the current status of a link.

TABLE 2 Read-Only Parameters Defining the Current Status

Parameter	Values and Description

link_status	Current link status
	0	= Link down
	1	= Link up
link_speed	Valid only if the link is up
	0	= Link is not up
	1000 = 1000 Mbps
link_mode	Valid only if the link is up
	0	= Half duplex
	1	= Full duplex

Flow Control Parameters

The GEM ASIC is capable of sourcing (transmitting) and terminating (receiving) pause frames conforming to IEEE 802.3x Frame Based Link Level Flow Control Protocol. In response to received flow control frames, the GEM can slow down its transmit rate. On the other hand, GEM is capable of sourcing flow control frames, requesting the link partner to slow down, provided that the link partner supports this feature. By default, GEM advertises Receive PAUSE capability during autonegotiation.

TABLE 3 Read-Write Flow Control Parameters Values and Descriptions

Parameter	Values	Description
	(on/off)

adv_pauseTX	0, 1	Transmit PAUSE Capable (default: not capable)
adv_pauseRX	0, 1	Receive PAUSE Capable (default: capable)

For normal operations, GEM doesn’t need to source flow control frames. However, if GEM is operating on a slow bus (for instance, a 33-MHz PCI bus slot), and there is a lot of frame reception activity, there could be a performance degradation due to Receive FIFO overflow. If the link partner is capable of terminating PAUSE flow control frames, the performance of GEM could be improved by enabling adv_pauseTX and restarting autonegotiation.

6 Platform Notes: The Sun GigabitEthernet Device Driver • March 1999

805-7945-10 specifications

Sun Microsystems 805-7945-10 is a notable component from the Sun Microsystems lineup, particularly recognized for its role in the high-performance computing and networking space. This product is often associated with Sun's commitment to delivering robust solutions for enterprise environments. The 805-7945-10 is primarily a part of the Sun Fire V20z server systems, designed to meet the growing demands of data centers needing powerful processing capabilities.

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In conclusion, the Sun Microsystems 805-7945-10 stands out due to its high-performance multi-core processing, flexible operating system support, robust storage options, and efficient thermal management. These features, combined with its strong networking capabilities, make it a valuable asset for modern data centers and enterprises looking for reliable server solutions.