Black Box LE14XXA Manual De Usuario

Black Box Modular Switches           

        Installation and User Guide (8/99) 

15 

Example 3 :   16-port LE1416A 

In another situation similar to Example 2 above, a larger central Switch is needed to 

provide for a 6-segment 100Mb fiber Fast Ethernet backbone, and switched copper support for 

4 high speed local servers. In addition, the router and two dual-speed hubs need switched copper 

ports.  The total is 14 ports, 6 fiber and 8 copper. 

The mixed-media flexibility of the Black-Box 4-Port Switches provides the user with 

more than one configuration in this case. The two ports not immediately used may be either fiber 

or copper.  If the probable growth of the central Switch is towards more fiber backbone 

segments, then two 4-port fiber 4PMs are selected to provide 6 required fiber ports and two for 

spares and/or future backbone expansion. The 8 switched copper ports are handled with two RJ

45 4-Port Modules configured into the LE1416A. Should the number of servers expand, more 

than one server can be serviced by a switched LE1416A port by using a small 4-port 100Mbps 

hub. 

If the probable growth of the central Switch is towards more local high speed servers 

and users, then one 4-port fiber 4PM is selected to provide 4 of the required fiber ports, and two 

“combo 3 RJ-45 + 1 fiber” 4PMs are configured for the other 2 fiber ports plus 6 of the switched 

copper ports. Finally, an RJ-45 QPM is configured to provide for the remaining 2 copper ports 

plus two for spares and/or future expansion. Should the need arise to add a built-in-fiber 

backbone port in the future, the RJ-45 4PM could be removed and another “3+1 combo” 4PM 

installed in the field. Alternatively, a 100MB Media Converter (such as the LH1500A-ST-R2) 

may be used on a copper port, with internal jumpers (See Section 3.4) set to support fixed 

100MB FDX on the RJ-45 port. 

Fig 2.4c: LE1416A provides a 100Mb mixed-media  backbone Switch. 

100Mb  fiber segment

10/100

10/100

UPLINK

LK/RX

P O R T

1 0 0

 

1

 

 

 

 

2   3  4   5    6   7   8  9  10  11 12 13 14 15 16

PWR BR

C O L         1 0
C O L       1 0 0

UPLINK

LK/RX

P O R T

1 0 0

 

1

 

 

 

 

2   3  4   5    6   7   8  9  10  11 12 13 14 15 16

PWR BR

C O L         1 0
COL   100

100 Mb/s

G A R R E T T

L I N K

R X

LINK

R

X

P W R   C O L

1         2         3
4

5         6         7
8