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The following are methods available for the ACS to issue configuration to the CPE:
• Transfers the configuration file to the CPE, and specifies the file as the next-startup
configuration file. At a reboot, the CPE starts up with the ACS-specified configuration file.
• Runs the configuration in the CPE's RAM. The configuration takes effect immediately on the
CPE. For the running configuration to survive a reboot, you must save the configuration on the
CPE.
Software image management
The ACS can manage CPE software upgrade.
When the ACS finds a software version update, the ACS notifies the CPE to download the software
image file from a specific location. The location can be the URL of the ACS or an independent file
server.
The CPE notifies the ACS of the download result (success or failure) when it completes a download
attempt. The CPE downloads the specified image file only when the file passes validity verification.
Data backup
The ACS can require the CPE to upload a configuration or log file to a specific location. The
destination location can be the ACS or a file server.
Status and performance monitoring
The CPE allows the ACS to monitor the status and performance objects in Table 22.
Table 22 CPE status and performance objects available for the ACS to monitor
Category Objects
Device information
Manufacturer
ManufacturerOUI
SerialNumber
HardwareVersion
SoftwareVersion
Operating status and information
DeviceStatus
UpTime
Configuration file ConfigFile
CWMP settings
ACS URL
ACS username
ACS password
PeriodicInformEnable
PeriodicInformInterval
PeriodicInformTime
ConnectionRequestURL (CPE URL)
ConnectionRequestUsername (CPE username)
ConnectionRequestPassword (CPE password)
How CWMP works
CWMP uses remote procedure call (RPC) methods for bidirectional communication between CPE
and ACS. The RPC methods are encapsulated in HTTP or HTTPS.
RPC methods
Table 23 shows the primary RPC methods used in CWMP.
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