Envoy ACP/XF Configuration and Management Manual

Subsystem Control Facility (SCF) for EnvoyACP/XF
EnvoyACP/XF Configuration and Management Manual—429232-003
4-10
SCF Command Routing
This command causes the WAN subsystem to create an EnvoyACP/XF line-handler
process named $EXF01.
Reconfiguring Existing Communications Lines
Once the process exists in the configuration database (as a DEVICE object) and has
been started using START DEVICE, you can start, stop, and change the associated
line OBJECT’s attributes directly through the EnvoyACP/XF subsystem.
You must consider the scope of line-attribute changes. To change a line attribute and
have it remain intact even after the system has been cold-loaded, issue an SCF
ALTER DEVICE command specifying the altered modifier to the WAN subsystem. See
Table 4-1 for a summary of line-attribute modification persistence.
Figure 4-5 shows the flow of SCF commands to the EnvoyACP/XF subsystem. For
more information about changing line attributes through Guardian procedure calls, see
the EnvoyACP/XF Application Programming Manual.
Figure 4-4. Starting a Process for the First Time
Table 4-1. Persistence of Line-Attribute Changes
Change Method Persistence
SCF commands to the WAN subsystem. Changes persist until you change the DEVICE
and/or the PROFILE object in the WAN
subsystem.
SCF commands to the EnvoyACP/XF
subsystem.
Changes persist until you change the
attributes, change the modifiers in the
PROFILE, stop the DEVICE in the WAN
subsystem, or until the system is cold-loaded.
Guardian procedure calls from an
application program to the EnvoyACP/XF
subsystem.
Changes persist only during the application
session.
VST011.vsd
Configuration
Data Base
DEVICE Object
($ZZWAN.#EXF01)
2. Look up
modifiers
WAN
Subsystem
$ZZWAN
3. Launch
process
1. START DEVICE $ZZWAN.#EXF01
EnvoyACP/XF
Subsystem
Line Handler
Process
($EXF01)