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3.2.3 System Diagnostics
The System Diagnostics/Statistics screen looks like this:
NOTE: This screen is updated once per second.
The System Diagnostics/Statistics options and functions are
described below.
Local Loop: Idle
(default)
The Local Loop is a bi-lateral loopback in which the data from the
local DTE and the data from the remote unit are looped back to their
respective sources (See Section 5.3). Activate this loop to test the
each of the DTE’s connection to the Model 2720.
The Local Loop test has four states:
Idle
No user-controlled loopbacks are active.
LL
The Model 2720 is in local loopback mode.
Off
The Model 2720 is in remote or CO initiated loopback
mode or sending a pattern. Local loopback is disabled.
LocP
The Model 2720 is in Local Loopback mode, and is send-
ing a test pattern.
Remote Loop Idle
(default)
The Remote Digital Loopback (RDL) test checks the performance
of both the local and remote Model 2720s, as well as the communica-
tion link between them. Data from the local DTE is sent across the
entire communication circuit and looped back to the local DTE.
The Model 2720 Initiating a RL can be in one of the following
states:
Idle
No user-controlled loopbacks are active.
TxPr
The Model 2720 is sending the preparatory phase pattern
lasting for approximately 2 -5 seconds.
WtAk
The Model 2720 is waiting for an acknowledgement from
the remote unit. If the remote unit does not respond, the
WtAk message will remain on the screen.
RxAk
The Model 2720 has received an acknowledgement from
the remote unit.
Tout
The Model 2720 is waiting before entering the Remote
Loopback test mode.
TM
The Model 2720 has successfully negotiated the Remote
Loopback test and is in control of the remote unit. You
may send a test pattern at this point by pressing:
c <spacebar>
TxTr
The Model 2720 is sending a Terminate Loopback mes-
sage to the remote unit. If the remote unit does not
respond, the local unit will return to the Idle state.
Tx1s
If the remote Model 2720 responds to the local NetLink-
T1™’s terminate loopback request, the local unit then
sends an all ones pattern before returning to the Idle
state
TxP
The Model 2720 is sending a test pattern while in Test
Mode
IdlP
The Model 2720 is sending a test pattern in place of data.
The Model 2720 is not in test mode.
The Model 2720 receiving a RL can be in one of the following states:
a
b
