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Using a Modem as a NetScreen console for out-of-band management

  [KB6065] Show Article Properties


Summary:
Using a Modem as a NetScreen console for out-of-band management.
Symptoms:
Null modem cable between NetScreen and US Robotics Sportster modem
US Robotics Sportster modem
Zoom modems
Configure a US Robotics Sportster modem to the console port
Solution:

1. Connect the NetScreen to the modem with a NULL modem cable.  Please note that this is not a standard NULL modem cable.  The pinouts are the same as a standard NULL modem cable with the exception that pins 2 and 3 are reversed.  Please refer to KB7810 for tested DB25-DB9 cable pinout.  Also refer to KB4802 for DB9 to RJ45 adaptor for platforms that do not use DB9 serial for console. 

2. Set the DIP switches on the USR like the following:
    1 - DTR normal (up)
    2 - Verbal result codes (up)
    3 - Suppress result codes (up)
    4 - No echo, offline commands (down)
    5 - Auto answer on (up)
    6 - Carrier detect override (down)
    7 - Load NVRAM defaults (up)
    8 - Smart mode (down)

3. Set the following AT commands on the modem console:
    at&N6    (set the maximum speed to 9600bps, the NetScreen can only talk 9600bps)
    at&W0    (store configuration 0)

For other brands of modems, please consult the vendor for more information on customizing the modem to communicate at 9600 bps, 8 bit, no parity, 1 stop bit.

Note: These settings will also work on Zoom modems.  The only trick is to power up the zoom modem first, then power up the NetScreen.  Once this is done, you should be able to connect to the NetScreen via Zoom modems. 

Here is the problem or goal:

  • Configure a US Robotics Sportster modem to the console port
  • Remote dial up access to the NetScreen console
  • Obtain console message via out of band connection using dial up modem

Problem Environment:

  • Null modem cable between NetScreen and US Robotics Sportster modem
  • US Robotics Sportster modem
  • Zoom modems

Applicable Products:

  • NetScreen-5
  • NetScreen-5XP
  • Netscreen-5GT
  • NetScreen-10
  • NetScreen-25
  • NetScreen-50
  • NetScreen-100
  • NetScreen-204
  • NetScreen-208
  • NetScreen- 500
  • NetScreen-1000
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