The Main Menu options are briefly described below.
aSystem Configuration options allow you to change various aspects of the Model 2720’s operation, e.g., framing, line cod- ing, and aggregate bandwidth.
bSystem 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.
cUnit 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.
dSave 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.
eLogoff. 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:
aLine 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)
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