Version Description The functional version of the EMS6 is SL91. Application EMS6 boards transmit Ethernet services on TDM radio networks or native Ethernet services from Hybrid radio networks through third-party SDH optical networks. Transmitting Ethernet Services over SDH/PDH Radio If OptiX RTN 910 NEs transmit Ethernet services over SDH/PDH radio, EMS6 boards receive, transmit, encapsulate, and map Ethernet services that come from customer premises or Layer 2 networks. Figure 1 Application scenario of EMS6 boards (1) NOTE: IF boards shown in the preceding figure can be TDM IF boards, or general-purpose IF boards or XPIC IF boards working in SDH radio mode. Service boards shown in the preceding figure are STM-1 interface boards. Helping Hybrid Radio Services Traverse Third-Party SDH Optical Networks If OptiX RTN 910 NEs converge Ethernet services over Hybrid radio and the converged Ethernet services need to traverse third-party SDH optical networks, EMS6 boards can apply to the NEs to encapsulate and map converged and locally received Ethernet services. Figure 2 Application scenario of EMS6 boards (2) NOTE: As shown in the preceding figure, the traffic flow is as follows: Hybrid IF board sends received Ethernet services to the packet switching unit of the CSHx board, the packet switching unit sends the Ethernet services to the EMS6 board, the EMS6 board encapsulates the Ethernet services into VC-4s and transmits the VC-4s to the cross-connect unit of the CSHx board, the cross-connect unit grooms the VC-4s to SDH service ports, and the ports send the VC-4s to the third-party SDH optical network. IF boards shown in the preceding figure must be general-purpose IF boards or XPIC IF boards working in native E1+Ethernet mode or native STM-1+Ethernet mode. Service boards shown in the preceding figure are STM-1 interface boards. CSHA/CSHB/CSHD/CSHE boards must work in conjunction with STM-1 interface boards for receiving and transmitting STM-1 services. To transmit IEEE 1588v2 packets through Ethernet ports on system control, switching, and timing boards, use CSHD/CSHE boards. Functions and Features The EMS6 receives/transmits 4xFE signals and 2xGE signals from the front panel and 1xGE packet plane signals from the backplane, and encapsulates these Ethernet signals into synchronous digital hierarchy (SDH) signals to transmit the Ethernet signals on the SDH network. The EMS6 supports transparent service transmission and Layer 2 switching. Table 1 lists the functions and features that the EMS6 supports. Table 1 Functions and features Function and Feature Description Basic functions Receives/transmits 4xFE signals, 2xGE signals, and 1xGE packet plane signals, and performs EoSDH processing. Port specifications FE electrical port Provides four 10/100BASE-T(X) ports. GE port Provides two GE ports by using small form-factor pluggable (SFP) modules of any of the following types: 1000Base-SX 1000Base-LX 1000Base-VX 1000Base-ZX 10/100/1000BASE-T(X) Port attributes Working mode The FE ports support 10M full-duplex, 100M full-duplex, and auto-negotiation. The GE electrical ports support 10M full-duplex, 10M half-duplex, 100M full-duplex, 100M half-duplex, 1000M full-duplex, and auto-negotiation. The GE optical ports support 1000M full-duplex and auto-negotiation. TAG attributes Sets and queries the TAG attribute of an Ethernet port. The TAG attribute can be set to tag aware, access, or hybrid. Jumbo frame Supports jumbo frames with a maximum frame length of 9600 bytes. Traffic control function Supports the port-based traffic control function that complies with IEEE 802.3x. Services Ethernet private line (EPL) services Supports the EPL services based on ports. Ethernet virtual private line (EVPL) services Supports the following types of EVPL services: EVPL services based on port+VLAN EVPL services based on QinQ Ethernet private LAN (EPLAN) services Supports the EPLAN services based on IEEE 802.1d bridges. Ethernet virtual private LAN (EVPLAN) services Supports the following types of EVPLAN services: EVPLAN services based on IEEE 802.1q bridges EVPLAN services based on IEEE 802.1ad bridges Encapsulation and mapping Encapsulation format Supports the following encapsulation formats: Generic Framing Procedure (GFP) High Level Data Link Control (HDLC) Link Access Protocol-SDH (LAPS) Maximum TDM service capacity supported by the backplane 4xVC-4 Maximum number of VCTRUNKs supported by the board 8 Maximum bandwidth supported by each VCTRUNK VCTRUNK1 to VCTRUNK7: 100 Mbit/s VCTRUNK8: 622 Mbit/s Link capacity adjustment scheme (LCAS) Supported Link aggregation group (LAG) Inter-board LAG Not supported Intra-board LAG Supported NOTE: Port 7 (bridging port) on the EMS6 does not support intra-board LAG. Ethernet ring protection switching (ERPS) Supports the ERPS function that complies with ITU-T G.8032 v1. Spanning Tree Protocol (STP) Supports the STP and Rapid Spanning Tree Protocol (RSTP), which comply with IEEE 802.1w. IGMP Snooping Supported Link state pass through (LPT)a Supported NOTE: Port 7 (bridging port) on the EMS6 does not support LPT. QoS Traffic classification Supports the following traffic classification modes: Traffic classification based on ports Traffic classification based on port+C-VLAN ID Traffic classification based on port+S-VLAN ID Traffic classification based on port+C-VLAN ID+S-VLAN ID CoS Schedules packets in traffic flows to eight egress queues of different CoSs by: Simple VLAN priority IP TOS value DSCP value Committed access rate (CAR) Provides the CAR function for traffic flows. Shaping Supports traffic shaping for a specific port or egress queue. Queue scheduling policy Supports the following scheduling policies: SP WRR SP+WRR ETH OAM Supports IEEE 802.1ag-compliant ETH-OAM function. Supports IEEE 802.3ah-compliant ETH-OAM function. NOTE: Port 7 (bridging port) on the EMS6 does not support IEEE 802.3ah-compliant ETH-OAM function. Remote monitoring (RMON) Supported Port mirroring Supported Clock Clock source Synchronous Ethernet NOTE: Ports 7 and 8 (bridging ports) on the EMS6 board do not support synchronous Ethernet. Clock protection Supports the following clock protection schemes: Protection based on clock source priorities Protection by running the Synchronization Status Message (SSM) protocol Protection by running the extended SSM protocol OM Loopback Supports the following loopback types: Supports inloops at the PHY layer of Ethernet ports excluding ports 7 and 8 (bridging ports). Supports inloops at the MAC layer of Ethernet ports excluding port 8 (bridging port). Supports inloops on VC-3 paths. Traffic monitoring Supported Warm reset and cold reset Supported Board manufacturing information query Supported Board power consumption information query Supported Board temperature detection Supported
