參數(shù)資料
型號: PSB7110
廠商: SIEMENS AG
英文描述: Enhanced ISDN Data Access Controller ISAR
中文描述: 增強(qiáng)綜合業(yè)務(wù)數(shù)字網(wǎng)的數(shù)據(jù)接入控制器專家組
文件頁數(shù): 143/164頁
文件大?。?/td> 1173K
代理商: PSB7110
_________________________________________________PSB 7110
Siemens Aktiengesellschaft
Page 143
3.12
Datamodem Automode Operation
Automode selection is available based on EIA/TIA PN-2330.
When enabled, the datapump will determine the communication standard supported by the remote
modem and configure itself according. That means the modulation scheme and the data rate is
automatically set without any host control.
The following figures show the flowcharts corresponding to the DSP algorithm used in supporting
automode originating and answering mode.
After the host configures the datapump to datamodem modulations with automode enabled, it can
request the selected modulation scheme from the ISAR as soon as the modulation has been
established between both modems.
Connect to Line
ANSWERING MODE
Send Answer Tone (2100 Hz),
Monitor Signals
AA detected or
ANS timeout (3.6 s)
V.32bis
AA
Send USB1, Monitor Signals
Start Timer (1000 ms)
Timeout
1270 Hz, 980 Hz, S1,
SB1 detected or timeout
Bell 103
V.21
V.22
V.22bis
1270 Hz
980 Hz
SB1
S1
Timeout
Stop USB1, Send AC,
Start Timer (800 ms)
AA detected or timeout
V.32bis
AA
Timeout
Stop AC, Transmit 1650 Hz,
Start Timer (2000 ms)
1270 Hz, 980 Hz
detected or timeout
V.21
980 Hz
Bell 103
1270 Hz
Timeout
Stop 1650 Hz, Transmit 1300 Hz,
Start Timer (2000 ms)
390 Hz detected
or timeout
V.32bis
V.23
390 Hz
Timeout
S1, SB1 detected or
timeout
V.22
V.22bis
SB1
S1
Send USB1, Monitor Signals
Start Timer (2000 ms)
Timeout
Figure 28 Automode answerer
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