Black Box Mixed-Media Fiber Hubs
Installation and User Guide (4/99)
Example 1: Upgrade, Expansion, Fiber Flexibility :
A University library has fiber cabling
installed in the building from the wiring closet to each PC. They have operated the network
setup at 10 Mbps. They have five users, a 10 Mbps print server, and Internet access. Now they
require higher bandwidth to accelerate their network. They want to upgrade three of their
present users to 100Mbps speed and expand for another five 100Mbps users (all with fiber),
and they expect a few more users next year.
An LH8050A Dual-Speed Fiber Hub handles all of the users at 10 Mbps and
100Mbps over fiber and copper in the same hub unit. Port modules can be changed or added
over time to suit expansion and additional changes. The LH8050A is initially configured with
eight ports at 100Mbps fiber, two ports at 10 Mbps fiber, and three 10/100 RJ-45 copper ports.
The LH8050A not only increases the network’s bandwidth and efficiency, but it also handles
existing 10 Mbps nodes over fiber in a economical way. The print server stays at 10 Mbps over
twisted pair wiring, and is accessible by all users. The file server and the Internet access,
devices located adjacent to the LH8050A, operate over twisted pair at 100Mbps.
A diagram of the installation is shown here.
19
LH8050A configured here with
8 100Mbps fiber, 2 10Mbps fiber, 3 10/100 RJ-45
Example 2: Security, Fiber Flexibility:
In a government intelligence agency where a secure
network is the first priority, the possibility of eavesdropping (as is possible with copper wiring)
must be prevented. Fiber LANs are regularly used to connect to each desktop and each node.
The LH8050A Fiber Hubs support all of the fiber port types (including the latest models),
adapting the fiber LAN to changing technology. The Dual- Speed feature provides for growth
Print Server
10
UPLINK
Server
Router
100
100
100
100
100
100
100
100
100
8 100Mbps fiber segments
10
0 M
b R
J-4
5
10Mb RJ-45
LE2801-FO
1
0
M
b
f
ib
er
