MSM7715 View Datasheet(PDF) - Oki Electric Industry
Part Name
Description
MFG CO.
'MSM7715' PDF : 21 Pages View PDF
¡ Semiconductor
Modem signal flow
Figure 7 shows the signal flow during normal modem operation.
MSM7715
AIN
Receive filter
Demodulator RD
Received data
Line
AOUT Transmit filter
Modulator
Transmitted data
TD
Figure 7 Signal Flow in Normal Operation
The MSM7715 uses the analog loopback test (ALB) mode and remote digital loopback test
(RDLB) mode as the modem testing functions. In these test modes, the signal flow shown in
Figure 8 is used. O (originate)/A (answer) in the test mode is the expression based on the
modulator side. In ALB mode, the transmit analog signal is input to the demodulator and can
be monitored as RD. In RDLB mode, the modem is configured as the remote modem in the RDL
test mode.
Data from the other modem that requested for RDL is returned to the other modem as a result
of echo-back.
[ALB]
AIN
Receive filter
RD
Demodulator
Transmit filter
AOUT
TD
Modulator
Received data
Transmitted data
[RDLB]
AIN
Receive filter
AOUT Transmit filter
Demodulator RD
Modulator
TD
Figure 8 Signal Flow in Test Mode
Received data
Transmitted data
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