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3.2.2 System Configuration
The default System Configuration menu looks like this:
The System Configuration options are described below:
Line Format: ESF (default)
Options: ESF, D4, UNFRAMED
D4: This is an older, but widely used, line format that does not
provide FDL, so network interface performance cannot be
monitored so easily. AT&T TR 62411 contains the specifica-
tions for this format and the ESF. D4 is also known as
Superframe format. According to TR 62411, "The Superframe
format...consists of 12 frames of 193 bits each for a total of
2316 bits. Each 193 bit frame consists of 192 bits preceded
by one framing bit....the framing bit is time shared to both
synchronize the terminal equipment and to identify the signal-
ing frames." (Sec. 4.1.1)
ESF: This stands for Extended Superframe Format, a line format
developed by AT&T. AT&T Technical Reference 54016 (TR
54016) defines the ESF, a format which is commonly used to
allow monitoring of the network interface performance over
the Facility Data Link (FDL). AT&T TR 62411 says, "the
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