363-206-208
Glossary
Issue 5 June 2000 GL-7
E
EC-1, EC-n
Electrical Carrier — The basic logical building block signal with a rate of 51.840 Mb/s for
an EC-1 signal and a rate of n times 51.840 Mb/s for an EC-n signal. An EC-1 signal
can be built in two ways: A DS1 can be mapped into a VT1.5 and 28 VT1.5s multiplexed
into an EC-1 (VT1.5 based EC-1) or a DS3 can be mapped directly into an EC-1 (DS3
based EC-1).
ECI
Equipment Catalog Item — The bar code number on the faceplate of each circuit pack
used by some inventory systems.
EEPROM
Electrically Erasable Programmable Read-Only Memory.
EIA
Electronic Industries Alliance, formerly the Electronic Industries Association.
EMC
Electromagnetic Compatibility.
EMI
Electromagnetic Interference.
EOOF
Excessive Out of Frame.
EPROM
Erasable Programmable Read-Only Memory.
EQ
Equipped (memory administrative state).
ES
Errored Seconds — A performance monitoring parameter. ES "type A" is a second with
exactly one error, ES "type B" is a second with more than one and less than the number
of errors in a severely errored second for the given signal. ES by itself means the sum
of the type A and type B ESs.
ESD
Electrostatic Discharge.
ESF
Extended Super Frame (format for DS1 signal.
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