Silicon Laboratories SI2493/57/34/15/04, SI2494/39 manual 180

AN93

		Table 112. <DLE> Simple Events (DCE-to-DTE) (Continued)
			Format: <DLE>[Code]
Code	Hex		Description
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.

180 Rev. 1.3