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Off
The NetLink-T1™ is in remote loopback mode or sending
a pattern. Local loopback is disabled.
LocP
The NetLink-T1™ is in Local Loopback mode, and is
sending a test pattern.
Remote Loop Idle
(default)
The Remote Digital Loopback (RDL) test checks the performance
of both the local and remote NetLink-T1™s, 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 NetLink-T1™ Initiating a RL can be in one of the following
states:
Idle
No user-controlled loopbacks are active.
TxPr
The NetLink-T1™ is sending the preparatory phase pat-
tern lasting for approximately 2 -5 seconds.
WtAk
The NetLink-T1™ 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 NetLink-T1™ has received an acknowledgement
from the remote unit.
Tout
The NetLink-T1™ is waiting before entering the Remote
Loopback test mode.
TM
The NetLink-T1™ 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 NetLink-T1™ 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 NetLink-T1™ 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 NetLink-T1™ is sending a test pattern while in Test
Mode
TxUp
The NetLink-T1 is sending the Loop-Up command to initi-
ate a CSU loopback
TxDN
The NetLink-T1 is sending the LoopDown command to
terminate a CSU loopback.
IdlP
The NetLink-T1™ is sending a test pattern in place of
data. The NetLink-T1™ is not in test mode.
The NetLink-T1™ receiving a RL can be in one of the following states:
RxPr
The NetLink-T1™ is receiving a preparatory pattern.
Sack
The NetLink-T1™, upon receiving a preparatory pattern,
sends an acknowledgement message.
RL
The NetLink-T1™ is in remote loopback mode.
RxTr
The NetLink-T1™ is receiving a terminate loopback mes-
sage.
Wt1s
The NetLink-T1™ is waiting for a sequence of all ones
and will time out if it does not receive it.
IdleP
The NetLink-T1™ is sending a QRSS, 511 or 2047 pattern.
Off
The NetLink-T1™ is in local loopback.
RDL Type: V.54
(default)
The user can set this variable to select the type of remote loop that will
be initiated by the NetLink-T1. If set to V.54, the NetLink-T1 will initiate
a V.54 loop when Remote Loop is selected either by software or the
front panel switches. If set to CSU, the NetLink-T1 will initiate a CSU
loop when Remote Loop is selected either by software or the front
panel switches.
NOTE: The NetLink will always respond to both loop types if they
are enabled as described in Section 3.2.2 System Configuration.
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.
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b
c
d
