2PK/2PL/2PM/2PN
1-4-39
U01040  A DCN or other inappropriate signal was received during standby for DIS signal recep-
tion.
U01041  A DCN signal was received after transmission of a DNL (MPS or EOM) signal (between 
units of our make).
U01042 A DCN signal was received after transmission of a DCS, TCF signal.
U01043  A DCN signal was received after transmission of an NSS1, NSS2 (TCF) signal (between 
units of our make).
U01044  A DCN signal was received after transmission of an NSS3, TCF signal (between units of 
our make).
U01045  A DCN or other inappropriate signal was received after transmission of an MPS signal.
U01046  A DCN or other inappropriate signal was received after transmission of an EOM signal.
U01047  A DCN or other inappropriate signal was received after transmission of an EOP signal.
U01048  A DCN signal was received after transmission of a PRI-EOP signal.
U01049  A DCN signal was received after transmission of a CNC signal (between units of our 
make).
U01050  A DCN signal was received after transmission of a CTC signal (ECM).
U01051  A DCN signal was received after transmission of an EOR.Q signal (ECM).
U01052  A DCN signal was received after transmission of an RR signal (ECM).
U01053  A DCN signal was received after transmission of a PPS.NULL signal (ECM).
U01054  A DCN signal was received after transmission of a PPS.MPS signal (ECM).
U01055  A DCN signal was received after transmission of a PPS.EOM signal (ECM).
U01056  A DCN signal was received after transmission of a PPS.EOP signal (ECM).
U01057  A DCN signal was received after transmission of a PPS.PRI-EOP signal (ECM).
U01070  Polarity reversal was detected during handshake.
U01071  Polarity reversal was detected during message transmission.
U01072  A break in loop current was detected during transmission.
U01073  During reverse polling in V.34 mode at the receiver unit, a CM signal was not detected 
when transmitting after reception.
U01080  A PIP signal was received after transmission of a PPS.NULL signal.
U01091  During transmission in V.34 mode, communication was interrupted because a PPR sig-
nal was received over 10 times even after reducing the communication speed to the min-
imum with the symbol speed maintained at the level of connection.
U01092  During transmission in V.34 mode, communication was interrupted because of an impos-
sible combination of the symbol speed and communication speed.
Error code Description