15
16
The Main Menu options are briefly described below.
System Configuration options allow you to change various
aspects of the Model 2720’s operation, e.g., framing, line cod-
ing, and aggregate bandwidth.
System Diagnostics/Statistics options allow you to monitor
the network performance, initiate V.54 loops, local loops, and
send test patterns. Network performance parameters are
updated once a second, giving you the ability to quickly deter-
mine if there is a problem.
Unit Information allow you to customize the Model 2720 for
your location. You can change the default header names to
give each unit a unique name and password. Also, you can
reset the unit to its default settings without the manual. It also
has a Service Information screen in case you need technical
assistance from Patton Electronics.
Implement and Save Changes. Once you have configured
the unit to your satisfaction, you can save the changes per-
manently by executing the Save Changes command. This will
update the unit’s configuration and save all the parameters to
permanent memory.
Logoff. For security, log off the control menu by executing
the Logoff command. This will blank the screen until an
[Enter] key is pressed.
a
b
c
d
e
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)
a
Commands and text entered here
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