Compaq AlphaServer GS80 User Manual page 148

After downloading binary files, you can set the com1_mode environment
variable from the SRM console to switch back to snoop mode or other modes for
accessing the SCM, or you can hang up the current modem session and
reconnect it.
Firm Bypass Mode
Firm bypass mode effectively disables the SCM. All data and control signals are
routed directly from the system COM1 port to the external modem port. The
SCM does not configure or monitor the modem, and the SCM dial-in and call-
out features are disabled. Firm bypass mode is useful if you want the system,
not the SCM, to fully control the modem port and you want to disable SCM
remote management features. You can switch to other modes, if necessary, by
resetting the com1_mode environment variable from the SRM console.
Hard Bypass Mode
Hard bypass mode is set by a jumper on the standard I/O module. If this
jumper is set, then all other modes are prohibited and the SCM is only
accessible from the local port.
8-10 AlphaServer GS80/160/320 User's Guide