GarrettCom 6K32FR User Manual

Magnum 6K32F/FR/FC/FRC Managed Switch Installation and User Guide (05/08) 

 

18 

.

.

The 1000Mb Gigabit fiber-port modules on the Magnum 6K32F Series 

switches 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 

s LEDs that indicate LK (Link status) 

num 

OS degradation while it is handling 

Ethernet 

t 

r application-specific priority control by the 

et) 

of bad packets, enabling all 

of the ava able ban

 

ame 

 is that more bandwidth is available for good packets when the traffic 

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 to AUTO mode, and can be fixed at 1000Mbps speed full-

duplex mode at any time.  The Gigabit fiber port ha

and ACT (receiving activity) on that port when lit. 

 

For Dual Gigabit modules option, please check page#60 for details info. 

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 Mag

6K32F Series can do its part to prevent any Q

traffic through its ports and buffers. 

The Magnum 6K32F Series 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 suppor

for QOS, the MNS software (R3) supports two priority queues that can be shared across 

the eight levels of defined packet priorities fo

user through software configuration settings. 

Magnum 6K32F Series are store-and-forward switches.  Each frame (or pack

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 

il

dwidth to be used for valid information.  

 

While other switching technologies (such as "cut-through" or 

"express") impose minimal frame latency, they will also permit bad frames to propagate

out to the Ethernet segments connected.  The "cut-through" technique permits collision 

fragment frames (which are a result of late collisions) to be forwarded which add to the 

network traffic.  Since there is no way to filter frames with a bad CRC (the entire fr

must be present in order for CRC to be calculated), the result of indiscriminate cut-

through forwarding is greater traffic congestion, especially at peak activity.  Since 

collisions and bad packets are more likely when traffic is heavy, the result of store-and-

forward operation

load is

t.  

 greates