Configuration Guide Configuring CWMP
 Major Terminologies
 CPE: Customer Premises Equipment
 ACS: Auto-Configuration Server
 RPC: Remote Procedure Call
 DM: Data Model
 Protocol Stack
Figure 9-2 shows the protocol stack of CWMP.
Figure 9-2 CWMP Protocol Stack
As shown in Figure 9-2, CWMP defines six layers with respective functions as follows:
 ACS/CPE Application
The application layer is not a part of CWMP. It is the development performed by various modules of the CPEs/ACS to
support CWMP, just like the Simple Network Management Protocol (SNMP), which does not cover the MIB management of
functional modules.
 RPC Methods
This layer provides various RPC methods for interactions between the ACS and the CPEs.
 SOAP
The Simple Object Access Protocol (SOAP) layer uses a XML-based syntax to encode and decode CWMP messages.. Thus,
CWMP messages must comply with the XML-based syntax.
 HTTP
All CWMP messages are transmitted over Hypertext Transfer Protocol (HTTP). Both the ACS and the CPEs can behave in
the role of HTTP clients and servers. The server function is used to monitor reverse connections from the peer.
 SSL/TLS
The Secure Sockets Layer (SSL) or Transport Layer Security (TLS) layer guarantees CWMP security, including data integrity,
confidentiality, and authentication.
 TCP/IP
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