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Black Box Modular Switches Installation and User Guide (8/99)
13
.2.4 Applications
Black Box LE14XXA-
Series Modular 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 LE14XXA-Series Switches enables them to inter-
connect a series of subnets
(one subnet per LE14XXA-Series Switch) in a L
AN traffic center. The subnet connections may
be via either 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.
Example 1 : LE1401A
In a typical 10 Mb network performance upgrade, some existing cascaded 10 Mbps
hubs connect
a group of users who share one 10 Mb traffic domain. The LE1401A 4port Series
Switch provides eight 10/100Mb traffic domains for increased performance. It can segment 10
Mbps and 100Mbps units, hubs and servers, in the existing network into multiple domains,
providing greatly increased bandwidth. In this case, two 100Mb fiber connections are required to
connect to more distant LAN centers, and a configuration with two “combo” 3@RJ-45 +
1@fiber-built-in 4PMs is used.
The LE1401A provides complete network con
nectivity so that all 10 Mb and 100Mb
nodes operate in a unified manner, functioning as one plug-and-
play switched network facility.
It filters and forwards packets from one segment to another, containing the local traffic and
allowing only the packets which need to be forwarded to go outside to the appropriate other
segments. This is ideal for a central departmental switch in a high-performance LAN center.
Figure 2.4 illustrates this example.
Fig. 2.4a: AFTER
LE1401A Switch
provides central
connectivi ty while
maintaining full 10
Mbps and 100Mbps
bandwidth on each
segment.
10 Mbps users
100Mbps users
Magnum 800E
Workgroup Hub
100 Mb/s
GARRETT
LINK
RX
LINK
RX
PWR COL
1
2
3
4
5
6
7
8
Magnum 800E
Workgroup Hub
100 Mb/s
GARRETT
LINK
RX
LINK
RX
PWR COL
1
2
3
4
5
6
7
8
PWR
Black Box LE1416A
Modular Switch
FDX/HDX
ACT
LK
100/10
FDX/HDX
ACT
LK
100/10
100Mbps Fiber
Segment
100Mbps Fiber
Segment