17
18
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 Options 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 assis-
tance from Patton Electronics.
Save Changes. Once you have configured the unit to your
satisfaction, you can save the changes permanently by exe-
cuting the Save Changes command. This will update the unit’s
configuration and save all the parameters to permanent mem-
ory.
Logoff. For security, log off the control menu by executing
the Logoff command. This will blank the screen until an
[Enter] key is pressed.
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 syn-
chronize the terminal equipment and to identify the signaling
frames.” (Sec. 4.1.1)
a
a
b
c
d
e
