Modem Support

Motorola V.34R ESP Dial-In Configuration

During the initial installation of the ESP, Cisco StrataCom strongly recommends that a modem be attached to the serial port and configured to auto-answer calls from our Customer Service or Technical Assistance Center (TAC). By dialing in, Customer Service or the TAC can access the ESP remotely and resolve potential problems. An optional Motorola V.34R Modem can be purchased from Cisco-StrataCom.

Note For field trials, the modem is required. There will have to be a modem attached (or telnet access provided) to every ESP in your network.

This setup prepares a modem attached to the ESP to answer a call from Cisco-StrataCom's Customer Service or Technical Assistance Center. You should arrange to work with Cisco-StrataCom's Customer Service or TAC to initially set up and test the modem for dial-in operation (i.e., auto answer). Cisco-StrataCom must record the telephone number for dialing into the ESP.

The port on the ESP should be factory-configured for 9600 bps and VT100 mode. Table G-1 lists the modem interface requirements.

Parameter	Requirement
ESP 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-ESP 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.

Table G-1:

Parameter Requirement

ESP 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-ESP 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.

Modem Interface Requirements

There are two procedures to be performed before Cisco-StrataCom's TAC can dial into the ESP:

Configure the ESP Serial Port to Emulate a VT100 Terminal.
Connect and Configure the Modem for the ESP.

These procedures are for a typical connection. Refer also to the Modem User's Guide.

Configure the ESP Serial Port to Emulate a VT100 Terminal

Typically the serial port on the ESP 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 ESP as superuser (i.e., root).

Step 2 Edit the /etc/ttytab file as follows:

ttyb "/usr/etc/getty D9600" dialup on remote

Step 3 Check to see if getty is running for ttyb by entering:

ps -aux | fgrep getty

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:

kill -9 <process ID>

Step 6 Restart init by entering:

kill -HUP 1

Step 7 This command restarts the new getty.

Connect and Configure the Modem for the ESP

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 G-2 to set up the modem for proper operation.

Step 5 Disconnect the terminal and connect that end of the cable to the ESP port (A/B [Terminal]). (The other end remains connected to the EIA port on the modem.)

Note The modem is typically connected to the ESP's A serial port. The same port to which a terminal is connected. The B port has the factory installed soft switch cable connected to it. The ESP will shut down if you remove the soft switch cable from the B serial port while it is powered on.

Step 6 Connect the modem to the phone line.

Step 7 Ask the Cisco-StrataCom Customer Service or TAC 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.

Table G-2:

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.

Setting up the Motorola V.34R Modem for Auto-Answer Mode

Hayes Modems

Not all of the modem EIA leads are supported by the ESP. 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, Cisco StrataCom Customer Service or the TAC will be able to dial in to the ESP and login as any other user on the system.

Table of Contents

Modem Support

Modem Support

Motorola V.34R ESP Dial-In Configuration

Configure the ESP Serial Port to Emulate a VT100 Terminal

Connect and Configure the Modem for the ESP

Hayes Modems