73k224bl ETC-unknow, 73k224bl Datasheet - Page 14

• Manufacturer Part Number: 73k224bl
• Description: Single-chip Modem Integrated Hybrid
• Manufacturer: ETC-unknow

73K224BL
V.22bis/V.22/V.21/Bell 212A/103
Single-Chip Modem w/ Integrated Hybrid
TONE REGISTER
ADDR
BIT
D0
D1
D2
011
TR
CONTROL
OUTPUT
RXD
D7
Guard Tone
4 Wire FDX
Overspeed
Extended
DTMF 0/
DTMF 1/
DTMF 2/
Answer/
NAME
TRANSMIT
GUARD
TONE
D6
D6 D5 D4 D0
X
X
X
1
1
CONDITION
TRANSMIT
ANSWER
D4
D4
TONE
0
0
0
0
X
0
0
1
1
D5
D1
D2
0
0
1
0
0
0
1
0
1
0
1
X
0
1
TRANSMIT
DTMF
14
DESCRIPTION
D0 interacts with bits D6, D5, and D4 as shown
Transmit DTMF tones must be in DPSK or Bell 103
Asynchronous QAM or DPSK +1% -2.5%. (normal)
Selects 2-wire duplex or half duplex
mode.
Select Bell mode answer tone. Interacts with DR bit D2
and TR bit D5.
Select CCITT mode answer tone. Interacts with DR bit
D2 and TR bit D5.
Select 1800 Hz guard tone.
Select 550 Hz guard tone.
Asynchronous QAM or DPSK +2.3% -2.5%. (extended
overspeed)
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.
D1 interacts with D4 as shown.
D4
DTMF 3
D3
DTMF 2/
4-WIRE
FDX
D2
EXTENDED
DTMF 1/
SPEED
OVER-
D1
ANSWER
DTMF 0/
GUARD
D0