Signaling service processing platform

Board Type

Table 1 lists the types of boards configured in the SPS.

Table 1 Types of boards configured in the SPS
Board Type	Board Name	Full Name	Location	Remarks
Logical board	SDAU	SPS Distributed Application Unit	Front board	The SDAU processes and forwards Diameter signaling and SS7 signaling.
	SDPU	SPS Dispatching Unit	Front board	The SDPU processes and forwards IP signaling.
	SSRU	SIP Signaling Routing Unit	Front board	The SSRU processes and forwards SIP signaling.
	USRSU	USCDB Data Routing and Service Unit	Front board	The USRSU implements the following functions: Subscriber data query and routing. Subscriber data storage. The Data Service Unit (DSU) provides the subscriber data query, addition, removal, and update services for the Data Routing Unit (DRU).
	USPID3	USCDB Provision Integrated Database Unit	Front board	The USPID3 implements data services and service provisioning.
	USPMU3	USCDB Provisioning and Data Management Unit	Front board	The USPMU3 serves as the entry point for the service provisioning system to access the USCDB. It converts the instructions sent from the service provisioning system into database operations and provides O&M for static data in the USCDB database. The USPMU3 also manages the data storage devices, that is, the disk arrays.
	OMU	Operation and Maintenance Unit	Front board	The OMU functions as the local operation and maintenance unit. It maintains and manages the equipment and services at a single site.
Physical board	UPB	Universal Process Blade	Front board	A UPB functions as a service processing unit in the subrack. Application software can be installed on a UPB to implement data and service processing. Each subrack can be configured with a maximum of 12 UPBs.
	USI	Universal Service Interface Unit	Back board	A USI functions as the interface board for a UPB board (excluding the SWU board). It provides interfaces for a UPB to communicate with external devices. The USI is the back board of the UPB.
	ETI	E1/T1 Interface	Back board	The ETI provides E1/T1 interfaces for the UPB to communicate with external devices.
	SWU	Switching Unit	Front board	An SWU exchanges information inside and outside a subrack through the Base and Fabric planes. One subrack is configured with two SWUs working in load-sharing mode.
	SWI	Switching Interface Unit	Back board	The SWI functions as the interface board for the SWU. It provides interfaces for an SWU to communicate with external devices.
	SMM	Shelf Management Module	Front board	The SMU is the management module of a subrack. It provides the following functions: Management of subrack components, sensors, fan trays, and PDBs Management of events and subscriber data Remote maintenance One subrack is configured with two SMMs working in active/standby mode.
	SDM	Subrack Data Module	Back board	The SDM is the data module of a subrack. It uses eight DIP switches to define the subrack number. It records the subrack information and system performance parameters. One subrack is configured with two SMMs working in active/standby mode. The SDM and SMM are installed in pairs.