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During the initial installation of the DAS Server Shelf, Cisco strongly recommends that a modem be attached to the serial port and configured to auto-answer calls from our Customer Service. By dialing in, Customer Service can access your system remotely and resolve potential problems. An optional Motorola V.34R Modem can be purchased from Cisco.
This setup prepares a modem attached to the DAS Server Shelf to answer a call from Customer Service. You should arrange to work with Customer Service to initially set up and test the modem for dial-in operation (i.e., auto answer). Customer Service must record the telephone number for dialing into the your system.
The port on the DAS Server Shelf should be factory-configured for 9600 bps and VT100 mode. Table B-1 lists the modem interface requirements.
| Parameter | Requirement |
|---|---|
| DAS Server Shelf Port | Serial port, A/B (Terminal) |
| Code | Standard 8-bit ASCII, 1 stop bit, no parity. |
| Interface | RS232 DCE. |
| Cable | 25-pin straight through cable. |
| Phone Lines | Dedicated dial-up business telephone line for ISC-to-DAS modem connection. |
| Data Rate | All standard asynchronous data rates from 300 to 19200 bps, independently selectable. |
| Supported Modems | Motorola Model V.34R 9600 baud modem. |
There are two procedures to be performed before Customer Service can dial into the DAS Server Shelf:
These procedures are for a typical connection. Refer also to the Modem User's Guide.
Typically the serial port on the DAS-AC or DAS-DC is factory-configured for 9600 bps and VT100 mode. If it is not, you can configure the serial port (A/B [Terminal]) as follows:
Step 1 Login to the DAS Server Shelf as superuser (i.e., root).
Step 2 Edit the /etc/ttytab file as follows:
Step 3 Check to see if getty is running for ttyb by entering:
Step 4 Note the process ID so you can kill it and restart the getty.
Step 5 If a getty is already running for the specified port, find its process id, then issue:
Step 6 Restart init by entering:
This command restarts the new getty.
To connect and configure the modem for dial-in operation, follow these steps:
Step 1 Connect power to the modem.
Step 2 Temporarily attach a terminal to the modem EIA port, using a straight-through cable. The modem's EIA port will automatically match the 9600 bps setting of the terminal.
Step 3 Configure the modem for 8 bits, no parity, and 1 stop bit.
Step 4 Enter the commands listed in Table B-2 to set up the modem for proper operation.
Step 5 Disconnect the terminal and connect that end of the cable to the DAS Server Shelf port (A/B [Terminal]). (The other end remains connected to the EIA port on the modem.)
Step 6 Connect the modem to the phone line.
Step 7 Ask Customer Service to test the operation of the dial-in modem.
| Step | Command | Function |
|---|---|---|
| 1. | AT&F&W | Reset to factory default and save. |
| 2. | ATS0=1 | Enables Auto-Answer Mode (answer on first ring). |
| 3. | ATL1 | Modem speaker at low volume. |
| 4. | AT*SM3 | Enables automatic MNP error correction. |
| 5. | AT*DC0 | Disables data compression. |
| 6. | AT*FL0 | Disables XON/XOFF flow control. |
| 7. | AT&S1 | Sets DSR to "normal". |
| 8. | ATE0 | Disables local character echo. |
| 9. | ATQ1 | Disables result codes. (Modem will appear "dead".) |
| 10. | AT&W | Saves current configuration settings in non-volatile memory. |
Not all of the modem EIA leads are supported by the DAS Server Shelf. If a Hayes modem is used in place of the MotorolaV34 Modem, configure the Hayes modem using the following AT commands:
| DCD - On | AT&CØ |
| DTR - On | AT&DØ |
| DSR - Normal | AT&S1 |
| CTS - ON when connected | AT&R1 |
| ATSØ=1 (answer on first ring) |
When the system is up, Customer Service will be able to dial in to the DAS Server Shelf and login as any other user on the system.
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