Harmonica - Cabletron Systems 100BASE-FX Cabling Manual

Harmonica

The Harmonica is a specialized type of patch panel. It is used only in twisted pair
networking situations. The harmonica provides front surface modular
connections like a patch panel. The back surface provides one or more RJ21
connectors. Through the use of a harmonica, one or more 24-pair UTP cables with
50-pin connectors can be broken out into 12 separate RJ45 ports.
Cable Termination
RJ45 Ports
50-pin RJ21 Port
Figure 13-4. Harmonica
Labeling Windows
Front
Rear
1845n32
Cabling Devices
13-5