73k224bl ETC-unknow, 73k224bl Datasheet - Page 13

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

DETECT REGISTER (continued)
ADDR
BIT
D2
D3
D4
D5
D6
D7
DR
010
INDICATOR
RECEIVE
LEVEL
D7
Receive Level
Carrier Detect
Answer Tone
Unscrambled
Receive Data
Mark Detect
S1 Pattern
Received
Indicator
NAME
Detect
PATTERN
DETECT
D6
S1
CONDITION
RECEIVE
DATA
Single-Chip Modem w/ Integrated Hybrid
D5
0
1
0
1
0
1
0
1
0
1
DETECT
UNSCR.
MARK
D4
13
DESCRIPTION
No answer tone detected.
In call init mode, indicates detection of 2225 Hz answer
tone in Bell mode (TR bit D0 = 0) or 2100 Hz if in CCITT
mode (TR bit D0 = 1). The device must be in originate
mode for detection of answer tone. Both answer tones
are detected in demodulation mode.
No carrier detected in the receive channel.
Indicated carrier has been detected in the received
channel.
No unscrambled mark.
Indicates detection of unscrambled marks in the received
data. Should be time qualified by software.
Continuously outputs the received data stream. This data
is the same as that output on the RXD pin, but it is not
disabled when RXD is tri-stated.
No S1 pattern being received.
S1 pattern detected. Should be time qualified by
software. S1 pattern is defined as a double di-bit
(001100..) unscrambled 1200 bit/s DPSK signal. Pattern
must be aligned with baud clock to be detected.
Received signal level below threshold, (typical -25 dBm0);
can use receive gain boost (+18 dB).
Received signal above threshold.
V.22bis/V.22/V.21/Bell 212A/103
DETECT
CARR.
D3
ANSWER
DETECT
TONES
D2
DETECT
PROG.
CALL
D1
73K224BL
INDICATOR
QUALITY
SIGNAL
D0