Product Description The functional version of the ISU2 is SL91. Application ISU2 boards function as SDH IF boards to transmit SDH radio services, or as Integrated IP microwave IF boards to transmit Integrated IP microwave services (native E1+Ethernet or native STM-1+Ethernet). Functioning as SDH IF Boards If applied to OptiX RTN 980 NEs building TDM radio networks, ISU2 boards function as large-capacity SDH IF boards to transmit TDM services. Figure 1 Application scenario of ISU2 boards (1) NOTE: When working in SDH radio mode, ISU2 boards transmit 1xSTM-1 or 2xSTM-1 SDH radio services. If a TDM radio network needs to transmit a small number of FE/GE services, these services must be encapsulated into TDM services by EMS6/EFP8 boards before being transmitted. Functioning as Integrated IP microwave IF Boards ISU2 boards apply to OptiX RTN 980 NEs to transmit native E1 services, native STM-1 services, native Ethernet services, native MPLS/PWE3 services, or a combination of these services over Integrated IP microwave. Figure 2 Application scenario of ISU2 boards (2) NOTE: In the preceding figure, if transmitted over Integrated IP microwave, E1 services can be native E1 services or CES/ATM E1 services, Ethernet services can be native Ethernet services or ETH PWE3 services, and STM-1 services must be native STM-1 services. ISU2 boards transmit native E1 services only when these boards work in native E1+Ethernet mode, and transmit native STM-1 services only when these boards work in native STM-1+Ethernet mode. 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 ISU2 receives and transmits one channel of IF signal, and provides a management channel and -48 V power supply to the ODU. Table 1 lists the functions and features that the ISU2 supports. The ISU2 needs to work with the packet switching unit to implement Ethernet service functions. Table 1 Functions and features that the ISU2 supports Function and Feature Description Basic functions Receives and transmits one channel of IF signal. Provides a management channel to the ODU. Supplies the required -48 V power to the ODU. Microwave type Integrated IP microwave SDH microwave NOTE: The Integrated IP microwave is compatible with the Hybrid microwave and the Packet microwave. Service categories in Integrated IP microwave mode Native E1 + Ethernet Native STM-1 + Ethernet NOTE: Ethernet services can be native Ethernet services or PWE3-encapsulated packet services. Service categories in SDH microwave mode STM-1 2xSTM-1 Backplane bus bandwidth 1 Gbit/s ATPC Supported AM Supported only in Integrated IP microwave mode Ethernet frame header compression Supported E1 priority Supported only in Integrated IP microwave mode with native TDM services being E1 services Microwave working mode See Technical specifications of the ISU2. Link-level protection 1+1 HSB/FD/SD protection Supported N+1 protection Supported LAG protection at air interfaces Supported PLA/EPLA Supported NOTE: EPLA is available only when the ISU2 works with the CSHNA boards. Slots 1 and 2 do not support EPLA. TDM service protection SNCP K byte pass-through Supported Ethernet service functions See Table 2. MPLS functions See the description of Multiprotocol label switching (MPLS)/Pseudo wire emulation edge-to-edge (PWE3) functions provided in the section for the system control, switching, and timing board. PWE3 functions License Air-interface capacity license Supported AM license Supported Clock Physical layer synchronization Clock at the air interface Physical-layer 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 Packet time synchronization Supports IEEE 1588v2 time synchronization. Supports ITU-T G.8275.1 time synchronization. Packet frequency synchronization Not supported Data communication network (DCN) Inband DCN Supported Outband DCN Supports one DCC that is composed of three DCC bytes for each channel in Integrated IP microwave mode. Supports one DCC that is composed of D1-D3 bytes, D4-D12 bytes, or D1-D12 bytes for each channel in SDH microwave mode. O&M Loopback Supports the following loopback types: Inloops and outloops at IF ports Inloops and outloops at MUX ports Cold reset and warm reset Supported In-service FPGA loading Supported PRBS BER test at IF ports Supported Queries of board manufacturing information Supported Queries of the board power consumption Supported Board temperature monitoring Supported Board power monitoring Supported Table 2 Ethernet service functions Function and Feature Description Services Native Ethernet services E-Line services Port-based E-line services VLAN-based E-line services E-Line services carried by QinQ links E-LAN services E-LAN services based on IEEE 802.1d bridges E-LAN services based on IEEE 802.1q bridges E-LAN services based on IEEE 802.1ad bridges PWE3 Ethernet services E-Line services carried by PWs E-Aggr services carried by PWs E-LAN services carried by PWs, that is, virtual private LAN services (VPLSs), supported only when the system control, switching, and timing board is an SLB2CSHN board ERPS Supports the ERPS function that complies with ITU-T G.8032 v1/v2. OAM Supports IEEE 802.1ag-compliant ETH-OAM function. Supports IEEE 802.3ah-compliant ETH-OAM function. Supports packet loss, delay, and delay variation measurement functions that comply with ITU-T Y.1731. LAG Supported Spanning tree protocol Supports Multiple Spanning Tree Protocol (MSTP) that runs only Common and Internal Spanning Tree (CIST) instances. This type of MSTP provides the same functions as Rapid Spanning Tree Protocol (RSTP). IGMP snooping Supported Quality of service (QoS) functions See the description of QoS functions provided in the section for the system control, switching, and timing board. RMON Supported Working Principle and Signal Flow This section describes how to process one IF signal in Integrated IP microwave mode, and it serves as an example to describe the working principle and signal flow of the ISU2. NOTE: The ISU2 adopts the same principle to process signals transmitted/received in Integrated IP microwave mode and signals transmitted/received in SDH radio mode. The difference is with regard to the microwave frame structure and processed service categories. Functional Block Diagram Figure 1 Functional block diagram of the ISU2
