Configuration Guide Configuring CWMP
This layer is the (Transmission Control Protocol/Internet Protocol (TCP/IP) protocol stack.
 RPC Methods
The ACS manages and monitors CPEs by calling mostly the following RPC methods:
 Get RPC Methods
The Get methods enable the ACS to remotely obtain the set of RPC methods, as well as names, values and attributes of the
DM parameters supported on CPEs.
 Set RPC Methods
The Set methods enable the ACS to remotely set the values and attributes of the DM parameters supported on CPEs.
 Inform RPC Methods
The Inform methods enable CPEs to inform the ACS of their device identifiers, parameter information, and events whenever
sessions are established between them.
 Download RPC Methods
The Download method enables the ACS to remotely control the file download of CPEs, including firmware management,
upgrade, and Web package upgrade.
 Upload RPC Methods
The Upload method enables the ACS to remotely control the file upload of CPEs, including upload of firmware and logs.
 Reboot RPC Methods
The Reboot method enables the ACS to remotely reboot the CPEs.
 Session Management
CWMP sessions or interactions are the basis for CWMP. All CWMP interactions between the ACS and CPEs rely on their
sessions. CWMP helps initiate and maintain ACS-CPE sessions to link them up for effective management and monitoring.
An ACS-CPE session is a TCP connection, which starts from the Inform negotiation to TCP disconnection. The session is
classified into CPE Initiated Session and ACS Initiated Session according to the session poster.
 DM Management
CWMP operates based on CWMP Data Model (DM). CWMP manages all functional modules by a set of operations
performed on DM. Each functional module registers and implements a respective data model, just like the MIBs implemented
by various functional modules of SNMP.
A CWMP data model is represented in the form of a character string. For a clear hierarchy of the data model, a dot (.) is used
as a delimiter to distinguish an upper-level data model node from a lower-level data model node. For instance, in the data
model InternetGatewayDevice.LANDevice, InternetGatewayDevice is the parent data model node of LANDevice, and
LANDevice is the child data model node of InternetGatewayDevice.
DM nodes are classified into two types: object nodes and parameter nodes. The parameter nodes are also known as leaf
nodes. An object node is a node under which there are child nodes, and a parameter node is a leaf node under which there is
no any child node. Object nodes are further classified into single-instance object nodes and multi-instance object nodes. A
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