Navigation: Glossary >
E1
A European standard for high-speed data transmission at 2.048 Mbit/s. It provides 32 x 64 kbit/s channels.
echo
In the traditional PSTN network, an echo is caused by the 2/4 wire conversion. In a common session, the end-to-end delay is small, an echo can be rapidly transmitted to the ears of speakers, and thus it is not easily felt. In long-distance calls or international long-distance calls, however, the end-to-end delay is big, and the echo canceller must be used to control echoes.
Electromagnetic Compatibility
Electromagnetic compatibility is the condition which prevails when telecommunications equipment is performing its individually designed function in a common electromagnetic environment without causing or suffering unacceptable degradation due to unintentional electromagnetic interference to or from other equipment in the same environment.
ElectroStatic Discharge
The sudden and momentary electric current that flows between two objects at different electrical potentials caused by direct contact or induced by an electrostatic field.
Element Management System
An element management system (EMS) manages one or more of a specific type of network elements (NEs). An EMS allows the user to manage all the features of each NE individually, but not the communication between NEs - this is done by the network management system (NMS).
EMC
See Electromagnetic Compatibility
emergency maintenance
A type of measure taken to quickly remove a fault, thus restoring the system or recovering the normal running of a device when an emergency fault occurs in the system or device. This type of accidental maintenance is performed to reduce losses.
EMS
Erlang
A unit of measurement of telephone traffic. It is equal to one hour of conversation (3,600 seconds or 36 CCS). It also specifies the approximate number of trunks in use; for example, if the traffic in a call center is 8.5 Erlangs in one hour, more than 8 trunks were used in that hour.
ESD
ESD wrist strap
Used to prevent the ElectroStatic Discharge (ESD) when you touch or operate a device or component.
Event alarm
Alarm caused by a predefined event, such as congestion, that happens when the equipment is running. The alarm represents an instantaneous status of the system and the status may not be a fault. Some event alarms are generated repeatedly and regularly.
Parent Topic: Glossary