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參數(shù)資料
| 型號： | MSM7715 |
| 廠商： | OKI SEMICONDUCTOR CO., LTD. |
| 英文描述： | Multi-Function Telecommunication LSI |
| 中文描述： | 多功能通信大規(guī)模集成電路 |
| 文件頁數(shù)： | 14/21頁 |
| 文件大?。?/td> | 150K |
| 代理商： | MSM7715 |
Semiconductor
MSM7715
14/21
Modem signal flow
Figure 7 shows the signal flow during normal modem operation.
AIN
Receive filter
Demodulator
Transmit filter
Modulator
AOUT
RD
TD
Line
Received data
Transmitted data
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.
AIN
Receive filter
Demodulator
Transmit filter
Modulator
AOUT
RD
TD
Received data
Transmitted data
AIN
Receive filter
Demodulator
Transmit filter
Modulator
AOUT
RD
TD
Received data
Transmitted data
[ALB]
[RDLB]
Figure 8 Signal Flow in Test Mode
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