Packet Prioritization, 802.1P Qos; Frame Buffering And Flow Control - GarrettCom Magnum 6K25 Hardware Installation And User's Manual

Magnum 6K25 Managed Fiber Switch
The 6K25 Modules provide a GBIC opening for insertion of industry-standard
GBICs to provide Gigabit (Gb) media flexibility. GBIC models are available for both
multi-mode (550m) and single-mode (10, 25, 40, 70)km fiber options, and for Gigabit
copper as well, with new models appearing often.
The 1000Mb Gigabit fiber-port
modules on the Magnum 6K25s are normally
set (factory default) to operate at AUTO
mode for best fiber distance and
performance. The 1000Mbps SC fiber-optic
module on the Gigabit -SX and Gigabit-LX
transceivers are compatible with the IEEE 802.3z Gigabit standards.
There are two LEDs mounted on each Gigabit port module. The Gigabit fiber
port is by default configured at AUTO mode, and can be fix at 1000Mbps speed full-
duplex mode at any times and has LEDs that indicate LK (Link status) and ACT
(receiving activity) on that port when lit.
2.2.9

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
6K25 can do its part to prevent any QOS degradation while it is handling Ethernet traffic
through its ports and buffers.
The Magnum 6K25 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.
2.2.10

Frame Buffering and Flow Control

Magnum 6K25'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
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Installation and User Guide (04/06)
ACT
F/
TX LK RX
1
10/100
F/
1@ 1000Mb Fiber SC + 4@10/ 100Mb
15
3 5 7
L
ACT