GarrettCom Quad - Manual (Page 20)

Magnum Quad-Series Fiber Switches Installation and User Guide (06/09)
13
www GarrettCom com . .
Example 2 : Magnum 8-port QS5108
In another 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 QS5108 equipped with one Fiber and one RJ-45 quad-port
modules provides an economical solution, configured with 8 switched ports (four
100Mbps fiber and four 10/100 RJ-45) in a rack-mount box. No Media Converters are
needed. The Fiber QPM can be selected to provide any 100Mbps fiber media connector
type desired. QPMs 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 QS5108 using a 4-port RJ-45 Quad-Port Module. The QPM
provides a switched port for two local high speed servers, another for the router, another
for the users connecting into a 16-port dual-speed hub such as the Magnum DS8016.
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
Magnum QS5108 . . . with built-in switched fiber ports at 100Mb speed, with full-duplex
mode as a default setting on fiber ports, and with some RJ-45 N-way 10/100Mb ports as
well. . . handles this application readily.
Figure 2.4b: The Magnum QS5108 provides a 100Mb fiber backbone facility.
100Mb Fiber Link
segment
Internet
Router
1 2 3 4 5 6 7 8 9 10 11
12 13 14 15 16 X
U PL INK LK/RX
POR T 100 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 PW R B R C OL 10
C OL 100
Magnum DS8016 Stackable Hub
M agn um 800E W or kgroup Hu b 10 0 Mb/s GA RR ETT LI NK
R X LI NK
R X PW R COL 1 2 3
4 5 6 7
8
100Mb Servers
100Mbps Workstations
Magnum QS5116 Fiber Switch
GA R RE TT
PW R A CT 100/10
2
3 1
FDX /H DX 4
L K A CT Fiber Switch Magnum QS5108
100/10 F DX /H DX
L K