Glossary
fallback | Retraining of a V.32 DBM at a lower rate or speed. |
FCC | Federal Communications Commission. Board of commissioners that regulates all |
| interstate and foreign electrical communication systems that originate from the |
| United States. |
A communications computer associated with a host computer that manages the | |
(FEP) | lines and routing of data through the network. |
IEC | InterExchange Carrier. A company that provides |
| carrier) telecommunication services, like AT&T, MCIr, and US SPRINTr. Access |
| to these services can be provided through DDS dedicated channels, a T1.5 |
| dedicated access channel, or digital switched access (DSA) channels. |
LADS | Local Area Data Set (also called a |
| a mode of operation where the control and tributary DSUs are directly connected |
| but not passing through a DDS network. |
LATA | Local Area Transport Area. A region served by a local exchange carrier (LEC) that |
| consists of one or more area codes. |
LCD | Liquid Crystal Display. A thin sandwich of two sealed glass plates containing liquid |
| crystal material. When voltage is applied, the amount of light able to pass through |
| the glass plates is altered so that messages may be ªwrittenº on the display. |
LEC | Local Exchange Carrier. A company that provides |
| carrier) telecommunication services, like NYNEX or Bell South. |
LED | |
| (DCP) that glows in response to the presence of a certain condition (e.g., Alrm). |
| NMS communications are directed to a tributary via a |
| the form of control network address/tributary network address (e.g., 157/04 ± DSU |
| control address of 157 and tributary address of 04). |
LSD | The state of the received Line Signal Detect lead (V.24 circuit 109). |
Network Management System | A set of diagnostic and configuration management tools for a data communication |
(NMS) | network, consisting of software programs and dedicated computer hardware. |
| Diagnostics that are transmitted over the |
| through a DBM in Standby mode so that bandwidth assigned to the data is not |
| affected. |
Executing the command will not disrupt primary data. | |
permissive interface | A dial modem operating mode characterized by a fixed output power level of |
| ± 9 dBm. It is one of two possible operating modes for a DBM connected to dial |
| lines (see programmable interface). |
option sets | Sets of configuration options that are related and fulfill a specific function. For |
| example, the DBM option set, which allows you to configure the DBM to perform |
| backup and restoral functions. |
December 1996 |
