Packet Prioritization, 802.1P Qos; Frame Buffering And Flow Control - GarrettCom MAGNUM MAGNUM 6KM Hardware Installation And User's Manual

Magnum 6KM Mobile Ethernet Switch Installation and User Guide
The 6KM managed switches also provides a PoE option via power –inside PoE
base unit (6KMP-48VDC) on Slot A and allows the users to utilize up to 4-ports of PoE
or 8-ports with additional PoE module (P6KM4-4M12) on Slot C to support 802.3af
Powered devices. See details for PoE base unit in sec 5.1.11. The Power Sourcing
Equipment (PSE) is fully compatible with Powered Devices (PD)(e.g wireless access
points, IP phones) that comply with the IEEE 802.3af PoE standard. The PoE switch
ports have an auto-sensing algorithm, so that they provide power only to 802.3af, PoE
end devices. PoE is managed by a multi-stage handshake to protect equipment from
damage and to manage power budgets . The PoE ports will discontinue supplying
power when the PoE powered devices are disconnected. This feature supports the
802.3af PoE PSE standard for over-current protection, under-current detection, and fault
protection.
High performance features include non-blocking unicast traffic speed on all
ports and 802.1p QoS Traffic Prioritization. Magnum 6KM switches are "plug-and-play"
and are designed for use in connecting edge devices such as PLCs, IEDs and PoE video
cameras with upstream switches and routers where a mix of bursty data traffic and
priority streaming traffic for video surveillance and cell-tower applications are present.
Magnum 6KM Mobile Ethernet Switches have heavy-duty steel cases and are
readily available with standard Industrial grade DC power. Internal AC power and DC
power input types may be 12V, 24V, 48V, 110, 125V, 250V and dual source DC input is
optional on the 6KM.
Alarm Relay contacts provided on each Magnum 6KM Switch monitor the
hardware and software through traps, providing a record of any losses of power signals
and other user- defined software events. See Section 3.5 for details.
2.2.1

Packet Prioritization, 802.1p QOS

Quality of Service means providing consistent predictable data delivery to
users from datagram paths that go all across a network. As a LAN device, the Magnum
6KM can do its part to prevent any QOS degradation while it is handling Ethernet traffic
through its ports and buffers.
The Magnum 6KM switching hardware supports the IEEE 802.1p standard and
fulfills its role in support of QOS, giving packet processing priority to priority tagged
packets according to the 802.1p standard. In addition to hardware support for QOS, the
MNS software (R2) supports two priority queues that can be shared across the eight
levels of defined packet priorities for application-specific priority control by the user
through software configuration settings.
2.2.2

Frame Buffering and Flow Control

Magnum 6KM's are store-and-forward switches. Each frame (or packet) is
loaded into the Switch's memory and inspected before forwarding can occur. This
technique ensures that all forwarded frames are of a valid length and have the correct
CRC, i.e., are good packets. This eliminates the propagation of bad packets, enabling all
of the available bandwidth to be used for valid information.
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