Version Description The functional versions of the CSHN are SLB1 and SLB2. Compared with the SLB1CSHN, the SLB2CSHN incorporates the following functions: Multiprotocol label switching transport profile (MPLS-TP) tunnel OAM ETH pseudo wire emulation edge-to-edge (PWE3) packets carrying control words Virtual private LAN services (VPLSs) Application CSHN boards function as system control, switching, and timing boards on OptiX RTN 980 NEs. In this scenario, these boards also converge and groom various services using their STM-1/4 and GE service ports. Figure 1 Application scenario of CSHN boards NOTE: In the preceding figure, IF boards can be TDM IF boards, or general-purpose IF boards or XPIC IF boards working in SDH microwave mode if they need to converge TDM microwave services, and they can be general-purpose IF boards or XPIC IF boards working in native E1+Ethernet mode or native STM-1+Ethernet mode if they need to converge integrated IP microwave services. E1 services shown in the preceding figure can be native E1 services or CES/ATM E1 services, and Ethernet services can be native Ethernet services or ETH PWE3 services. Service boards shown in the preceding figure can be Ethernet interface boards, STM-1 interface boards, E1 interface boards, or Smart E1 processing boards. Functions and Features The CSHN provides 22 Gbit/s packet switching, full time-division cross-connection, system control and communication, and clock processing functions. It provides GE ports, STM-1/4 ports, auxiliary ports, and management ports. Table 1 lists the functions and features that the CSHN supports. Table 1 Functions and features that the CSHN supports Function and Feature Description Basic functions Switching capacity Supports 22 Gbit/s packet switching function. Cross-connect capacity Higher order cross-connect capacity: equivalent to 128x128 VC-4s Lower order cross-connect capacity: VC-12/VC-3 full time-division cross-connections equivalent to 32x32 VC-4s System control and communication Manages, monitors, and controls the running status of the IDU, and works as a communication service unit between the NMS and boards, thereby allowing the NMS to control and manage the NE. Clock Clock source Provides the system clock and frame headers of service signals and overhead signals for the other boards by tracing any of the following clock sources: External clock SDH line clock PDH tributary clock Microwave link clock Synchronous Ethernet clock Clock protection Supports the following clock protection schemes: Protection based on clock source priorities Protection by running the SSM protocol Protection by running the extended SSM protocol Time synchronization Supports IEEE 1588v2 time synchronization. Supports ITU-T G.8275.1 time synchronization. Supports use of the AE 905S module as the clock source for time synchronization. IEEE 1588 ACR Supported External clock port 1 External time port 2 Data communication network (DCN) Outband DCN Supports a maximum of 24 DCCs. Inband DCN Supports the inband DCN function. The DCN bandwidth is configurable. Network management protocols Huawei embedded control channel (HWECC) protocol Supported IP protocol Supported L2 DCN Supported Simple Network Management Protocol (SNMP) Provides the SNMP Get and Set functions for managing devices. Protection 1+1 hot backup Supported Multiprotocol label switching (MPLS)/Pseudo wire emulation edge-to-edge (PWE3) functions Supported See Table 2. Quality of service (QoS) functions Supported See Table 3. Ethernet service functions Supported See Table 4. STM-1/4 service functions Supported See Table 5. Auxiliary ports and management ports NMS port 1 NMS serial port 1 NE cascade port 1 Outdoor cabinet monitoring port 1 The port specifications comply with RS-485. O&M Warm reset and cold reset Supported In-service FPGA loading Supported Queries of board manufacturing information Supported Queries of the board power consumption Supported Board temperature monitoring Supported Board power monitoring Supported Detection of indicators on the other boards Supported Hot swapping Supported Pluggable CF card Supported The packet switching unit of the CSHN works with its service interface unit or a service board to implement MPLS/PWE3 functions. Table 2 provides details about these functions. NOTE: The following functions are applicable only to the SLB2CSHN. MPLS-TP tunnel OAM that complies with ITU-T Y.1731 MPLS-TP PW OAM that complies with ITU-T Y.1731 Control word
