GarrettCom 6K25 User Manual

Page 22

Magnum 6K25 Managed Fiber Switch Installation and User Guide (04/06)

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10/100

ACT

TX RX

ACT

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 1@ 1000Mb Fiber SC + 4@10/ 100Mb

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