參數(shù)資料
型號: 73K324L-IP
廠商: Electronic Theatre Controls, Inc.
英文描述: CCITT V.22bis, V.22, V.21, V.23, Bell 212A Single-Chip Modem
中文描述: 國際電話電報諮詢委員會V.22bis,.22,.21,.23,貝爾212A章單芯片調(diào)制解調(diào)器
文件頁數(shù): 11/31頁
文件大小: 183K
代理商: 73K324L-IP
73K324L
CCITT V.22bis, V.22, V.21, V.23, Bell 212A
Single-Chip Modem
11
DETECT REGISTER
D7
D6
D5
D4
D3
D2
D1
D0
DR
010
RECEIVE
LEVEL
INDICATOR
S1
PATTERN
DETECT
RECEIVE
DATA
UNSCR.
MARK
DETECT
CARRIER
DETECT
SPECIAL
TONE
DETECT
CALL
PROG.
DETECT
SIGNAL
QUALITY
INDICATOR
BIT NO.
D0
NAME
CONDITION
0
DESCRIPTION
Indicates normal received signal.
Signal
Quality
Indicator
1
Indicates low received signal quality (above average error
rate). Interacts with Special Register SQ bits D2, D1.
0
No call progress tone detected.
D1
Call Progress
Detect
1
Indicates presence of call progress tones. The call
progress detection circuitry is activated by energy in the
normal 350 to 620 Hz call progress band.
0
Condition not detected
1
Condition detected
CR0
D0
TR
D0
CR2
D5
1
0
1
2225 Hz ±10 Hz answer tone detected in V.22bis, V.22
modes.
1
1
1
2100 Hz ±21 Hz answer tone detected in V.22bis, V.22
modes.
0
X
0
900 Hz SCT tone detected in V.23 mode.
D2
Special Tone
Detect
1
X
0
2100 Hz or 2225 Hz answer tone detected in QAM,
DPSK mode.
0
No carrier detected in the receive channel.
D3
Carrier
Detect
1
Indicated carrier has been detected in the received
channel. Should be time qualified by software.
0
1
No unscrambled mark being received.
D4
Unscr. Mark
Detect
Indicates detection of unscrambled marks in the received
data. Should be time qualified by software.
Continuously outputs the received data stream.
D5
Receive Data
This data is the same as that output on the RXD pin, but
it is not disabled when RXD is tri-stated.
0
No S1 pattern being received.
D6
S1
Detect
Pattern
1
S1 pattern detected. Should be time qualified by
software.
S1
is
an
unscrambled
(11001100...) sent in DPSK 1200 bit/s mode. Generated
pattern must be properly aligned to transmitter baud clock
to be detected.
double
dibit
D7
Receive
Level
Indicator
0
Received signal level below threshold, (
-25 dBm0);can
use receive gain boost (+18 dB)
1
Received signal above threshold.
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