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参数资料
| 型号： | RH56D-PCI |
| 厂商： | Conexant Systems, Inc. |
| 英文描述： | Host Controlled V.90/K56flex Modem device |
| 中文描述： | 主机控制V.90/K56flex调制解调器设备 |
| 文件页数： | 18/60页 |
| 文件大小： | 357K |
| 代理商： | RH56D-PCI |
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RH56D-PCI Modem Designer’s Guide
2-2
Conexant
1213
Conexant Proprietary Information
GSTN Cleardown (V.90/K56flex, V.34, V.32 bis, V.32)
Upon receiving GSTN Cleardown from the remote modem in a non-error correcting mode, the modem cleanly terminates the
call.
Fall Forward/Fallback (V.90/K56flex, V.34/V.32 bis/V.32)
During initial handshake, the modem will fallback to the optimal line connection within K56flex/V.34/V.32 bis/V.32 mode
depending upon signal quality if automode is enabled by the +MS command.
When connected in V.90/K56flex/V.34/V.32 bis/V.32 mode, the modem will fall forward or fallback to the optimal line speed
within the current modulation depending upon signal quality if fall forward/fallback is enabled by the %E1 command.
Retrain
The modem may lose synchronization with the received line signal under poor line conditions. If this occurs, retraining may be
initiated to attempt recovery depending on the type of connection.
The modem initiates a retrain if line quality becomes unacceptable if enabled by the %E command. The modem continues to
retrain until an acceptable connection is achieved, or until 30 seconds elapse resulting in line disconnect.
2.3 ERROR CORRECTION AND DATA COMPRESSION
V.42 Error Correction
V.42 supports two methods of error correction: LAPM and, as a fallback, MNP 4. The modem provides a detection and
negotiation technique for determining and establishing the best method of error correction between two modems.
MNP 2-4 Error Correction
MNP 2-4 is a data link protocol that uses error correction algorithms to ensure data integrity. Supporting stream mode, the
modem sends data frames in varying lengths depending on the amount of time between characters coming from the DTE.
V.42 bis Data Compression
V.42 bis data compression mode operates when a LAPM or MNP connection is established.
The V.42 bis data compression employs a “string learning” algorithm in which a string of characters from the DTE is encoded
as a fixed length codeword. Two dictionaries, dynamically updated during normal operation, are used to store the strings.
MNP 5 Data Compression
MNP 5 data compression mode operates during an MNP connection.
In MNP 5, the modem increases its throughput by compressing data into tokens before transmitting it to the remote modem,
and by decompressing encoded received data before sending it to the DTE.
2.4 FAX CLASS 1 OPERATION
Facsimile functions operate in response to Fax Class 1 commands when +FCLASS=1 or +FCLASS=1.0.
In the fax mode, the on-line behavior of the modem is different from the data (non-fax) mode. After dialing, modem operation
is controlled by fax commands. Some AT commands are still valid but may operate differently than in data modem mode.
Calling tone is generated in accordance with T.30.
2.5 VOICE/TAM MODE
Voice and audio functions are supported by the Voice Mode. Voice Mode includes three submodes: Online Voice Command
Mode, Voice Receive Mode, and Voice Transmit Mode.
2.5.1 Online Voice Command Mode
This mode results from the connection to the telephone line or a voice/audio I/O device (e.g., microphone or speaker) through
the use of the +FCLASS=8 and +VLS commands. After mode entry, AT commands can be entered without aborting the
connection.
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