Zhone IMACS-200 ユーザーズマニュアル

-9

Errored Seconds. The number of seconds for which BRI port has detected a NEBE or FEBE 
greater than zero (0).

Extended Superframe (24-frame sequence for a T1 line; consists of two superframes)

Electronic Switching System

Earth and Magnetic, or recEive and transMit. The signaling leads on inter-switch voice 
connections.

An E&M voice port for this system.

European Telecommunications Standards Institute

Four-frame multiframe structure used in T1 signals.

Frame Alignment Signal

Federal Communications Commission

Facility Data Link, consists of every other framing bit of an extended T1 superframe. The FDL 
is used to convey performance data, line test/loopback status, and other parameters for an 
ESF-framed T1 line. The FDL rate is 4 kHz.

Fractional E1