In T1 and E1 systems, a second where no error blocks are received.
Electro-Magnetic Compatibility (EMC)
The field of electrical sciences that addresses a device's unintended electro-magnetic radiation or its vulnerability to spare radiation in order to prevent interference.
Electro-Magnetic Interference (EMI)
Interference from an external source that disturbs an electrical circuit and prevents it from operating normally.
Embedded Operations Channel (EOC)
A channel in a telecommunication facility provided specifically for administration, operations, and maintenance.
Errored Second (ES)
An interval of a second during which any possible error has occurred.
Extended Super Frame (ESF)
In T1 circuits this consists of 24 frames of 192 bits each, with the 193rd bit for timing and CRC check.
Errored Second Ratio (ESR)
The ratio of errored seconds (ES) to total number of seconds during any given measurement interval.
Ethernet Synchronization Messaging Channel (ESMC)
Ethernet Synchronization Messaging Channel (ESMC) for Synchronous Ethernet links are communication channels where Synchronization Status Messages (SSM) are exchanged. The ESMC protocol is composed of the standard Ethernet header for a slow protocol, an ITU-T specific header, a flag field and a type length value (TLV) structure.
European Telecommunication (ETSI)
Standards making organization in Europe. Similar to ANSI and CSA, but specifically for the telecom industry.
External Clock (EXT CLK)
A timing signal external to the operating unit, to which the unit is synchronized.
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