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INTEL® PCMCIA 14.4/14.4 HAYES AUTOSYNC SUPPORT
The Intel® PCMCIA Faxmodem 14.4/14.4 card supports Hayes AutoSync and MNP Class 10.
Note: This information applies only to the Faxmodem 14.4/14.4 card. The Faxmodem 24/96 and 96/96 cards do not provide this support.
AutoSync is the Hayes method for synchronous communications. To use the Faxmodem 14.4/14.4 in AutoSync mode, you will need communications software that incorporates Hayes Synchronous Interface (HSI), such as an IBM 3270 terminal emulator, or equivalent.
This software must be installed on the laptop computer (or host system) with the PCMCIA slot. The software configures the Faxmodem 14.4/14.4 for proper AutoSync operation. For example, the initiation string sent to the unit should specify values for Registers S19, S20, and S25. Hayes AutoSync operation is enabled by selecting AT&Q4 prior to dialing.
Intel® PCMCIA 14.4/14.4 MNP Class 10 Support
The Intel PCMCIA Faxmodem 14.4/14.4 card supports Hayes AutoSync and MNP Class 10.
Note: This information applies only to the Faxmodem 14.4/14.4 card. The Faxmodem 24/96 and 96/96 cards do not provide this support.
Microcom Network Protocol Class 10 (MNP 10) is an industry standard method for coping with the adverse telephone line conditions associated with cellular telephone usage (such as background noise). MNP 10 can improve the data throughput of modems connected using cellular links.
To use the Faxmodem 14.4/14.4 with a cellular telephone, purchase an adapter from a cellular telephone vendor or a cellular equipment manufacturer. To achieve an MNP 10 session, both the originating and the receiving modems must support the MNP 10 protocol.
The PCMCIA Faxmodem 14.4/14.4 attempts to establish an MNP 10 session with every call. If the remote modem does not support MNP 10, the Faxmodem 14.4/14.4 automatically matches the error detection/correction method (if any) used by the remote modem.
Intel® PCMCIA 14.4/14.4 Hayes Autosync/MNP 10 AT Commands
The following AT commands support Hayes AutoSync and MNP Class 10 on the Intel PCMCIA Faxmodem 14.4/14.4 card.
Note: This information applies only to the Faxmodem 14.4/14.4 card. The Faxmodem 24/96 and 96/96 cards do not provide this support.
)Mn Enable Cellular Power Level Adjustment
| n=0 |
Disables power level adjustment during MNP 10 link negotiation. (Default) |
| n=1 |
Enables power level adjustment during MNP 10 negotiation. |
| n>1 |
Returns error |
*Hn Link Negotiation speed (between two MNP Class 10 modems)
| n=0 |
Link negotiation occurs at the highest supported speed (default) |
| n=1 |
Link negotiation occurs at 1200 bps |
| n=2 |
Link negotiation occurs at 4800 bps |
| n>2 |
returns error |
-Kn MNP Extended Services (conversion of V.42 LAPM to MNP 10)
| n=0 |
Disables V. 42 LAPM to MNP 10 conversion |
| n=1 |
Enables V.42 LAPM to LNM 10 conversion (default) |
| n=2 |
Enables V.42 LAPM to MNP 10 conversion; inhibits MNP extended services initiation during V.42 LAPM answer mode detection phase |
| n>2 |
returns error |
&Qn selected communications mode
| n=0 |
asynchronous operation (default) |
| n=1,2 |
|
| or 3 |
returns error |
| n=4 |
Enables Hayes AutoSync operation |
| n>4 |
returns error |
Note: Special communications software incorporating Hayes Synchronous Interface support is required to use AutoSync. Registers S19, S20 and S25 must be set to the desired values before AutoSync is started.
Registers S19 and S20 are reserved for Hayes AutoSync operation. S19 defines options for Hayes AutoSync operation:
| Bit 0 |
reserved |
| Bit 1 |
0 for BSC; 1 for HDLC (or SNA) |
| Bit 2 |
0 disables address detector; 1 enables address detector |
| Bit 3 |
0 NRZI selected; 1 NRZ selected |
| Bit 4 |
0 Mark idle; 1 Flag or sync idle |
| Bit 5 |
reserved |
| Bit 6 |
reserved |
| Bit 7 |
reserved | S20 defines the HDLC address or BSC SYNC character, depending on the value of Bit 1 in S19. Its range is 0 to 255.
This applies to:
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