Magnum 500-Series Switching Hubs | Installation and User Guide (08/98) |
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Example 4 : Magnum 528F
In another situation similar to Example 3 above, the network may need to be linked with fiber cabling to a Fast Ethernet backbone. This application is handled by the Magnum 528F, using one 100Mb switched copper port for local high speed servers and users, while using the fiber 100Mb switched port for the fiber backbone connection.
Using the Magnum 528F’s 100Mb switched fiber port, one can implement a Fast Ethernet switched fiber connection that runs in full-duplex mode. The result is a high-speed LAN connection upstream with switched 100Mb full-duplex performance and maximum fiber distance – all without a 100Mb media converter. Alternatively, two Magnum 528Fs can be connected with switched 100Mb fiber to form a larger LAN.
When using a Magnum 528F’s 100Mb switched fiber port as a link, it is frequently desirable to operate the connection to the upstream device in full-duplex mode since 100Mb fiber cable has severe distance limitations at half-duplex. In this situation, it is necessary to operate both ends of the fiber link with ports that have fixed 100Mb-speed and user-determined full-duplex capability (no auto-negotiation).
Many low-end “commodity” switching hubs that only have RJ-45 ports with auto-negotiation cannot support this application. They have no built-in fiber, and they do not properly support 100Mb media converters. Even if they did support media converters properly, the converters are awkward extra items that add substantially to the cost. But the Magnum 528F models . . . with fixed 100Mb speed as a default setting on the Fast Ethernet ports, and with manually-selected half- or full-duplex mode per Fast Ethernet port . . . handle this application readily and economically.
| | | Magnum 500-series |
| | | Switching Hub |
| GARRETT | | |
| | | |
PWR | | AUTO | 10Mb |
L K RX | 100 Mb | LINK | RX |
TX | RX | | |
UPLINK
100 | LK | | | | | | | |
10 | RX | | | | | | | |
F/H | F/H | | | | | | | |
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
Internet
| 10Base-T | Router |
100Mb Servers 100Mb Fiber Link | | |
and Workstations | | |
100Mb Media | 10Mb Workgroup | |
Converter | | |
Figure 2.4e: The Magnum 528F provides a 100Mb port for backbone connection.
GARRETT
