7-4 Compaq AlphaServer ES40 Service Guide
7.2
Operating Modes
The RMC can be configured to manage different data flow paths
defined by the com1_mode environment variable. In Through mode
(the default), all data and control signals flow from the system COM1
port through the RMC to the active external port. You can also set
bypass modes so that the signals partially or completely bypass the
RMC. The com1_mode environment variable can be set from either
SRM or the RMC. See Section 7.6.1.
Figure 7–1 Data Flow in Through Mode
Modem
System
SRM/AlphaBIOS
Consoles
Operating System
RMC Modem
Port (Remote)
Local Serial Terminal
(MMJ Port)
Modem
PK0908
RMC> RMC>
Remote Serial Terminal
or Terminal Emulator
COM1
COM1 Port
UART
Modem Port
UART
RMC PIC
Processor
RMC COM1
Port (Local)
DUART
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