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8-6 AlphaServer GS80/160/320 Users Guide
8.3 SCM COM1 Operating Modes
The SCM 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 SCM to the active external port. You can also set bypass
modes so that the signals partially or completely bypass the SCM. The
com1_mode environment variable can be set from either SRM or the
SCM. See Section 8.7.1.
Figure 82 Data Flow in Through Mode
Modem
System
SRM Console
Operating System
SCM Modem
Port (Remote)
Local System
Management Console
Modem
PK-0627-99
SCMnn>
QBBs (PSMs)
PCI Boxes (PBMs)
H-Switch (HPM)
SCMnn>
Remote System
Management Console
COM1
CSB
COM1 Port
UART
Modem Port
UART
SCM
Processor
SCM Port
(Local)
DUART
UART
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