CMX269AE2 MX-COM, Inc., CMX269AE2 Datasheet - Page 9

• Manufacturer Part Number: CMX269AE2
• Description: 1200/2400/4800bps MSK modem
• Manufacturer: MX-COM, Inc.

1200/2400/4800bps MSK Modem
5.2 Test Set Up
5.3 Bit Error Rate
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
1999 MX-COM, Inc.
PSEUDO-RANDOM
PREAMBLE &
GENERATOR
DATA
Tx SYNC
1 x 10
1 x 10
1 x 10
1 x 10
1 x 10
DATA
TX
I/P
Figure 6: Typical Variation of Bit Error Rate with Input Level
-1
-2
-3
-4
-5
OSCILLOSCOPE
50
www.mxcom.com tel: [phone] 744 5050 fax: [phone]
TRANSMITTER
(components
AMMETER
CMX469A
as Fig. 2)
MILLI-
*
V
BIT RATE BANDWIDTH
DD
SIGNAL
Figure 5: CMX469A Test Set-Up
O/P
TX
100
VOLTMETER
TRUE RMS
(INTERFACE)
BUFFER
CIRCUIT
150
9
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200
(with attenuator and
noise generator)
5kHz/8kHz BW
TELEPHONE
SIMULATOR
CHANNEL
250
300
VOLTMETER
TRUE RMS
INPUT SIGNAL LEVEL (mV
SIGNAL
RX
IN
CMX469A PRELIMINARY INFORMATION
500
(components
AMMETER
RECEIVER
CMX469A
as Fig. 2)
MILLI-
V
DD
700
CARRIER
DETECT
RMS
OUT
800
DATA OUT
CLOCKED
Doc. # 20480191.002
)
SYNC
RX
DETECTOR
DETECTOR
OUT HIGH
CARRIER
DETECT
ERROR