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SysKonnect SK-98xx V2.0 Gigabit Ethernet Adapter
Advanced Power Management / Wake on LAN 37
Advanced Power Management / Wake on LAN
The SysKonnect SK-9821 V2.0 Gigabit Ethernet Adapter supports power management as defined
in the PCI Bus Power Management Interface Specification V1.1 and Network Device Class Power
Management Reference Specification V2.0. The power management features are implemented ac-
cording to the Advanced Configuration and Power Interface Specification V2.0.
The SysKonnect SK-9821 V2.0 Gigabit Ethernet Adapter utilizes an auxiliary power supply to keep
some parts running. This setting enables the PCI network device to “Wake on LAN”.
The Wake on LAN functionality uses three mechanisms to create a wake up event:
• OnNow Pattern Match Detect
Incoming packets are compared to up to seven patterns stored in a pattern matching table. A
match causes a wake up event.
• Magic Packet
TM
Detect
The incoming data stream is searched for a so-called magic packet frame that consists of 6
bytes of 0xFF followed by 16 iterations of the adapter’s MAC address. If this sequence is found,
a wake up event is created.
• Link Change Detect
Any change of the link status will cause a wake up event.
Wake on LAN is supported by Windows 2000 and Windows XP.
Reliability
The SysKonnect SK-98xx V2.0 Gigabit Ethernet Adapter comes with a variety of reliability features.
They aim at maintaining a connection as long as possible. This is reached by redundant or grouped
links (link aggregation). The on-board sensors and driver functions help to monitor the health of
adapters and their ports enabling pro-active network management. The reliability features are de-
scribed in the following sections.
Link Aggregation
Link aggregation or trunking is a method of combining physical network links into a single logical link
for increased bandwidth. With link aggregation, it is possible to increase the capacity and availability
of the communications channel between devices (both switches and end stations) using existing
Fast Ethernet and Gigabit Ethernet technology. Two or more Gigabit Ethernet connections are com-
bined into a team in order to increase the bandwidth capability and to create resilient and redundant
links. A set of multiple parallel physical links between two devices is grouped together to form a sin-
gle logical link. Link aggregation offers an efficient and low-cost solution to increase bandwidth be-
tween server and switch. Another advantage it provides is that if a connection fails completely the
remaining links can take over the traffic and thus replace the broken line.
Link aggregation also provides load balancing where the processing and communications activity is
distributed across several links so that no single link is overwhelmed.
By taking multiple LAN connections and treating them as a unified, aggregated link, practical bene-
fits can be achieved in many applications.