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New Member

Modem to 7206

HELP!!! I have had quite a frustrating day today. I have four US robotics 33.6 external modems. Three are new and one is one from 1998. I can get the old modem to work connected to the AUX port of a 7206 just fine.

With the other three I am able to connect to the modem but I never get a password prompt. All four modems have the DIP switches set the same and I have checked the configuration with the ATI4 command. All modems match exactly. I am testing the modems on the same router wiht the same cable/connector so I am sure that the config on the AUX port is correct. Has anyone seen this issue before?

New Member

Re: Modem to 7206

Attaching a US Robotics Modem to the Console Port of a Cisco Router

1.Type the following initialization string which will write the desired init string settings to NVRAM:


Note: The 0s in the string above are zeroes.

AT command Description

&f0 Set to Factory Defaults (no Flow Control)

q1 Eliminates result codes

e0 Disable echoing commands.

s0=1 Auto Answer on first ring

&b0 Floating DTE Speed

&n6 Highest Link Speed (DCE rate) is 9600bps

&u6 DTE speed maximum is 9600 (DTE follows DCE speed)

&m4 ARQ/Normal Mode

&k0 Disable Data Compression

&w Store configuration to nvram

2. Turn off the modem.

3. Ensure the remote USR / 3Com modem (modem you’ll be dialing into) is connected to the router’s Console/AUX port and configured as:


1 = Down / On (DTR Override)

2 = UP / Off (Numeric Result Codes)

3 = Up / Off (Suppress Result Codes)

4 = Down / On (No Echo)

5 = Up / Off (Auto Answer First Ring)

6 = Down / On (Override Carrier Detect)

7 = Up / Off (Load Factory Defaults)

8 = Down / On (Smart Mode)

4. Unplug the rolled RJ-45 cable from the PCs RJ-45-to-DB-9 adapter and attach it to the Console/AUX port of the router

5. Turn the modem on.

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