| A | B |
|---|
| PBX | DIGITAL OR ANALOG TELEPHONE SWITCHBOARD LOCATED ON THE SUBSCRIBER PREMISES AND USED TO CONNECT PRIVATE AND PUBLIC TELEPHONE NETWORKS. |
| MICRON | UNIT OF MEASURE EQUAL TO ONE MILLIONTH OF A METER OR ONE THOUSANDTH OF A MILLIMETER. |
| HUB | A DEVICE THAT SERVES AS THE CENTER OF A STAR- TOPOLOGY NETWORK AND CONNECTS END STATIONS. |
| PATCH PANEL | AN ASSEMBLY OF PIN LOCATIONS AND PORTS THAT CAN BE MOUNTED ON A RACK OR WALL BRACKET IN THE WIRING CLOSET. |
| HCC | WIRING CLOSET WHERE THE HORIZONTAL CABLING CONNECTS TO A PATCH PANEL WHICH IS CONNECTED BY BACKBONE CABLING TO THE MAIN DISTRIBUTION FACILITY. |
| IDF | A SECONDARY COMMUNICATIONS ROOM FOR A BULIDING USING A STAR NETWORKING TOPOLOGY. |
| OSCILLATION | SOMETIMES REFERRED TO AS HARMONICS, OR NOISE. |
| MDF | THE PRIMARY PATH FOR A BUILDING. |
| BACKBONE | PART OF A NETWORK THAT ACTS AS THE PRIMARY PATH FOR TRAFFIC THAT IS MOST OFTEN SOURCED FROM, ADN DESTINED FOR, OTHER NETWORKS. |
| POP | WHERE TELECOMMUNICATIONS SERVICES, PROVIDED BY THE TELEPHONE COMPANY, CONNECT TO THE BUILDING'S COMMUNICATION FACILITIES. |
| HIERARCHICAL STAR | EXTENDED STAR TOPOLOGY WHERE A CENTRAL HUB IS CONNECTED BY VERTICAL CABLING TO OTHER HUBS THAT ARE DEPENDENT ON IT. |
| SAG | BROWNOUT THAT LASTS LESS THAN A SECOND. |
| SPIKE | AN IMPULSE THAT PRODUCES A VOLTAGE OVERLOAD ON THE POWER LINE. |
| MCC | WIRING CLOSET THAT SERVES AS THE MOST CENTRAL POINT IN A STAR TOPOLOGY. |
| CATCHMENT AREA | ZONE THAT FALLS WITHIN AREA THAT CAN BE SERVED BY AN INTERNETWORKING DEVICE SUCH AS A HUB. |
| SURGE | ANY VOLTAGE INCREASE ABOVE 110% OF THE NORMAL VOLTAGE CARRIED BY A POWER LINE. |
