73K224BL
V.22bis, V.22, V.21, Bell 212A, 103
Single-Chip Modem w/ Integrated Hybrid
DATA SHEET
TONE REGISTER
TR
D7
D6
D5
D4
D3
D2
D1
D0
ADDR
011
RXD
OUTPUT
CONTROL
TRANSMIT
GUARD
TONE
TRANSMIT
ANSWER
TONE
TRANSMIT
DTMF
DTMF 3
DTMF 2/
4-WIRE
FDX
DTMF 1/
EXTENDED
OVER-
DTMF 0/
ANSWER
GUARD
SPEED
BIT
NAME
CONDITION
DESCRIPTION
D0 interacts with bits D6, D5, and D4 as shown
D6 D5 D4 D0
D0
DTMF 0/
X
X
X
1
1
0
X
0
Transmit DTMF tones must be in DPSK or Bell 103 mode.
Answer/
Guard Tone
Select Bell mode answer tone. Interacts with DR bit D2 and
TR bit D5.
X
1
0
1
Select CCITT mode answer tone. Interacts with DR bit D2
and TR bit D5.
1
1
0
0
0
0
0
1
Select 1800 Hz guard tone.
Select 550 Hz guard tone.
D4 D1
D1 interacts with D4 as shown.
Asynchronous QAM or DPSK +1% -2.5%. (normal)
D1
D2
DTMF 1/
0
0
0
1
Extended
Overspeed
Asynchronous QAM or DPSK +2.3% -2.5%. (extended
overspeed)
D4 D2
DTMF 2/
0
0
0
1
Selects 2-wire duplex or half duplex
4 Wire FDX
D2 selects 4-wire full duplex in the modulation mode
selected. The receive path corresponds to the receive
mode selected by 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: 14 of 33
© 2005, 2008 TERIDIAN Semiconductor Corporation
Rev 7.1
TERIDIAN [ TERIDIAN SEMICONDUCTOR CORPORATION ]
