GarrettCom 4K-Series Manual De Usuario

Magnum 4K8 Switches      Installation and User Guide      (10/04) 

 

12 

.

.

 

 

Magnum 4K8 Switches offer high performance and flexibility, and are easily 

used in a variety of applications including client/server computing, performance 

upgrades of departmental networks, and collapsed backbone applications. The Dual-

Speed characteristic of the 4K8 Switches enables them to inter-connect a series of 

subnets (one subnet per 4K-Series Switch) in a LAN traffic center. The subnet 

connections may be via either optional fiber or twisted pair cabling, and may be 

100Mbps or 10 Mbps speed and full-or half-duplex mode.   

 

The mixed-media capability is ideal for upgrading existing Ethernet LAN 

networks, where existing cabling must be accommodated.  The fiber-built-in media 

capability is ideal for integrating future-proof fiber cabling into the LAN structure. 

In general application, a  Switch is needed to provide a Fast Ethernet 

backbone.  The backbone consists of four high-speed LAN segments, each operating 

over 100MB full-duplex fiber lines.  In addition to interconnecting the fiber backbone 

segments in the network center, the Switch needs to provide high-speed switched support 

for two central servers, for a 100MB connection to a router, and for a dual-speed hub 

serving a local workgroup of over a dozen users, printers, etc. 

The Magnum 4K8 equipped with one optional Fiber port and  eight RJ-45 ports 

provides an economical solution, configured with 8 switched ports ( 10/100 RJ-45) in a 

rack-mount box. No Media Converters are needed. The Fiber FPM can be selected to 

provide any 100Mbps fiber media connector type desired. FPMs with multi-mode or 

single-mode fiber types are available. 

 

This requirement for connecting local devices over twisted pair cabling is 

handled by the Magnum 4K8 with one optional Fiber-Port Module. The FPM provides a 

switched port for distance with high bandwidth throughput to the connected network 

away from the present network. 

Since 100Mb fiber Ethernet has severe distance limitations at half-duplex, it is 

necessary in high speed backbones to operate fiber links in the full-duplex mode. Many 

low-end switches that only have RJ-45 N-way 10/100Mb ports would need to have a 

media converter on each fiber line. But most media converters do not support auto-

negotiation and would not enable the fiber backbone lines to operate full-duplex.  But the