电信专业英英词典E-4_电脑电信
electromagnetic interference; also, exchange message interface
end office (eo)
eo is a lec (boc or an itc) switching system within a lata where local loops to customer stations are terminated for purposes of interconnection with each other and with trunks. co (central office) and eo are often used interchangeably.
entrance facilities
1. in a premises distribution system, the point of interconnection be tween the building wiring system and external telecommunications facilities (lec networks, other buildings, etc.). bellcore defines the interface with lec networks as end-user points of termination (pot). 2. has a further specific meaning in interstate access, entrance facilities for interstate access (enfia).
eo
end office
epscs
enhanced private switched communications service
equipment room
in a premises distribution system, an equipment room is a special purpose room(s), with access to the backbone wiring, for housing elecommunications, data processing, security, and alarm equipment.
erlang
an erlang is an international dimensions unit of the average traffic intensity of a facility during a period of time; one erlang of traffic is equivalent to a single user who uses a single resource 100% of the time. see centicall seconds.
esf
extended superframe
esn
electronic switched network
exchange carrier (or local exchange carrier lec)
an exchange carrier is any company, boc or independent which provides intra-lata telecommunications within its franchised area.
extended superframe format (esf)
esf is an extension of the superframe format of t1 carrier systems from 12 to 24 frames and the use of framing bits for error checking, a facilities data link (fdl) as well as frame synchronization. see superframe format.