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AN93
180 Rev. 1.3
o 0x6F Receive buffer overrun
u 0x75 Transmit buffer underrun.
c 0x63 Fax Calling. DCE has detected T.30 1100 Hz tone.
e 0x65 Data Calling. DCE has detected V.25 1300 Hz tone.
h 0x68 Line voltage collapsed (phone line detached).
H 0x48 Line voltage restored (phone line reattached).
q 0x71 Presumed End of Message (QUIET).
l 0x6C Loop current interruption.
b 0x62 Busy tone detected.
d 0x64 Dial tone detected.
r 0x72 Ringing tone detected.
p 0x70 Line voltage increased (parallel phone goes on-hook). DCE monitors loop current when
off-hook and line voltage when on-hook.
P 0x50 Line voltage decreased (parallel phone goes off-hook). DCE monitors loop current when
off-hook and line voltage when on-hook.
a 0x61 Fax or data answer. DCE has detected T.30 2100 Hz or V.21 1650 Hz answer tone.
f 0x66 Data answer. DCE has detected 2225 Hz, USB1 or AC answer sequence.
( 0x28 Negative (decreased) loop-current drift detected.
) 0x29 Positive (increased) loop-current drift detected.
Table 112. <DLE> Simple Events (DCE-to-DTE) (Continued)
Format: <DLE>[Code]
Code Hex Description