25
26
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:
RxPr The Model 2720 is receiving a preparatory pattern.
Sack The Model 2720, upon receiving a preparatory pattern,
sends an acknowledgement message.
RL The Model 2720 is in remote loopback mode.
RxTr The Model 2720 is receiving a terminate loopback mes-
sage.
Wt1s The Model 2720 is waiting for a sequence of all ones and
will time out if it does not receive it.
IdleP The Model 2720 is sending a QRSS, 511 or 2047 pattern.
Off The Model 2720 is in local loopback.
Test Pattern Idle
(default)
Options: Idle or Sending
To send a pattern, press the ‘c’ key and press <spacebar> to send
the test pattern. The “
OK” message indicates the received test pattern
is error-free. The “BE” message indicates errors in the received pat-
tern.
Idle Indicates that Model 2720 is not sending a pattern.
Sending Indicates that 2720 is sending a pattern.
Error Insertion Off
(default)
Options: On, Off
You may inject intentional errors into the test pattern by turning
Error Insertion ON. The Error (ERR) LED will blink once per second.
Selected Pattern
Options: QRSS, 511, or 2047
Use this option to select the test pattern used to test the link.
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(23 pages)
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