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Glossaries

  • Erbium Doped Fiber Amplifier (EDFA)
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  • Error Free Second (EFS)
  • In T1 and E1 systems, a second where no error blocks are received.
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  • 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.
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  • Electro-Magnetic Interference (EMI)
  • Interference from an external source that disturbs an electrical circuit and prevents it from operating normally.
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  • Embedded Operations Channel (EOC)
  • A channel in a telecommunication facility provided specifically for administration, operations, and maintenance.
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  • Errored Second (ES)
  • An interval of a second during which any possible error has occurred.
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  • 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.
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  • Errored Second Ratio (ESR)
  • The ratio of errored seconds (ES) to total number of seconds during any given measurement interval.
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  • European Telecommunication (ETSI)
  • Standards making organization in Europe. Similar to ANSI and CSA, but specifically for the telecom industry.
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  • External Clock (EXT CLK)
  • A timing signal external to the operating unit, to which the unit is synchronized.
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