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20
HELPFUL HINTS
1.
To make a selection, key the highlighted letter that corre-
sponds to a menu selection.
2.
To execute the selection, type <Enter/CR>
3.
Select
g
Save Changes from Main Menu after making modi-
fications to any NetLink-T1™ parameter. When the changes
are saved, the Model 2710RC will implement the changes and
save the new settings into non-volatile memory
The Main Menu options are briefly described below.
System Configuration options allow you to change various
aspects of the NetLink-T1™’s operation, e.g., framing, line
coding, and aggregate bandwidth.
System Diagnostics/Statistics options allow you to monitor
the network performance, initiate RDL 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 NetLink-T1™ 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.
Save Changes Once you have configured the unit to your sat-
isfaction, you can save the changes permanently by executing
the Save Changes command. This will update the unit’s config-
uration 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.
3.3.4 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 pro-
vide FDL, so network interface performance cannot be moni-
tored so easily. AT&T TR 62411 contains the specifications for
this format and the ESF. D4 is also known as Superframe for-
mat. 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 signaling 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
Extended Superframe Format “extends” the DS1 superframe
structure from 12 to 24 frames…for a total of 4632 bits. It
redefines the 8 kb/s channel previously used exclusively for
terminal and robbed bit signaling synchronization.” The ESF
provides a 4 kb/s data link, called the FDL, which allows for
in-service monitoring and fast troubleshooting. Certain net-
work services require the ESF.
c
d
e
a
a
b
d
