73K224L
V.22bis, V.22, V.21, Bell 212A, 103
Single-Chip Modem
DATA SHEET
TONE REGISTER (continued)
D7
D6
D5
D4
D3
D2
D1
D0
RXD
OUTPUT
CONTR.
TRANSMIT
GUARD
TONE
TRANSMIT TRANSMIT
DTMF 3
DTMF 2/4
WIRE FDX
DTMF 1/
EXTENDED
OVER- SPEED
DTMF 0/
ANSWER/
GUARD
TR
011
ANSWER
TONE
DTMF
BIT NO.
NAME
CONDITION
DESCRIPTION
D6 D5 D4 D0 D0 interacts with bits D6, D5, and D4 as shown.
D0
DTMF 0/
Answer/ Guard
Tone
1
1
0
0
0
0
0
1
Select 1800 Hz guard tone.
Select 550 Hz guard tone.
D1 interacts with D4 as shown.
D4 D1
D1
D2
DTMF 1/
Extended
Overspeed
0
0
0
1
Asynchronous QAM or DPSK +1.0% -2.5%. (normal)
Asynchronous QAM or DPSK +2.3% -2.5%. (extended
overspeed)
D4 D2
DTMF 2/4
WIRE FDX
Selects 2 wire duplex or half duplex
0
0
0
1
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
TERIDIAN [ TERIDIAN SEMICONDUCTOR CORPORATION ]
