73K224L
V.22bis, V.22, V.21, Bell 212A, 103
Single-Chip Modem
DATA SHEET
TONE REGISTER (continued)
D7
TR
RXD
011 OUTPUT
CONTR.
BIT NO.
D6
TRANSMIT
GUARD
TONE
NAME
D0
DTMF 0/
Answer/ Guard
Tone
D1
DTMF 1/
Extended
Overspeed
D2
DTMF 2/4
WIRE FDX
D5
D4
D3
D2
D1
D0
TRANSMIT TRANSMIT
ANSWER
DTMF
TONE
DTMF 3
DTMF 2/4
WIRE FDX
DTMF 1/
EXTENDED
OVER- SPEED
DTMF 0/
ANSWER/
GUARD
CONDITION DESCRIPTION
D6 D5 D4 D0 D0 interacts with bits D6, D5, and D4 as shown.
1 0 0 0 Select 1800 Hz guard tone.
1 0 0 1 Select 550 Hz guard tone.
D4 D1
D1 interacts with D4 as shown.
00
Asynchronous QAM or DPSK +1.0% -2.5%. (normal)
01
Asynchronous QAM or DPSK +2.3% -2.5%. (extended
overspeed)
D4 D2
00
Selects 2 wire duplex or half duplex
01
D2 selects 4 wire full duplex in the modulation mode
selected. The receive path corresponds to the ANS/ORIG
bit CR0 D0 in terms of high or low band selection. The
transmitter is in the same band as the receiver, but does
not have magnitude filtering or equalization on its signal as
in the receive path.
Page: 12 of 31
© 2005, 2008 TERIDIAN Semiconductor Corporation
Rev 7.1