The ISU board is available in five types: type A, type B, type C, type D, and type E. The differences among the five types are the support of the Ethernet interface and the T1 interface, and the impedance of the E1 interface.

provides the version description of the ISU board.

Table 1 Version description of the ISU board

NOTE:

Network application of the OptiX OSN 500

The OptiX OSN 500 is new-generation optical transmission equipment, which is developed by Huawei for the access layer.

The OptiX OSN 500 is used at the access layer of the transmission network. It can provide STM-1/STM-4 optical interfaces and forms the entire equipment group with the other access layer equipment, thus optimizing the Huawei OptiX product series.

shows the position of the OptiX OSN 500 in the transmission network.

Figure 1 Position of the OptiX OSN 500 in the transmission network

The OptiX OSN 500 supports various types of services and provides abundant functions and features, to ensure the quality and efficiency of the service transmission.

The OptiX OSN 500 can access the following types of services:

• SDH service signals
• PDH service signals
• Ethernet service signals

​Cross-Connect Capacity:

The OptiX OSN 500 supports the higher-order full cross-connections of 21.25 Gbit/s or lower-order full cross-connections of 5 Gbit/s.

The cross-connect unit of the OptiX OSN 500 is integrated on the ISU board.

The cross-connect unit is a mandatory functional unit and provides the following functions:

• Service grooming function of the ADM equipment
• Higher-order full cross-connections of 21.25 Gbit/s or lower-order full cross-connections of 5 Gbit/s

Networking Capability:

The OptiX OSN 500 can form multiple network topologies such as the ring network and chain network.

The OptiX OSN 500 supports separate and combined configuration of the following types of NEs: terminal multiplexer (TM) and add/drop multiplexer (ADM). The OptiX OSN 500 can form a chain or ring network by using the STM-1/STM-4 optical interfaces.

When the OptiX OSN 500 functions as the access equipment, it can network with Huawei Metro and OSN equipment series. The OptiX OSN 500 can also network with third-party equipment.

Ethernet Features:

The OptiX OSN 500 provides layered protection for the Ethernet services, and supports all the protection at the SDH layer and the Ethernet service layer.

The OptiX OSN 500 supports Ethernet private line (EPL) services, Ethernet virtual private line (EVPL) services, Ethernet private LAN (EPLAN) services, and Ethernet virtual private LAN (EVPLAN) services. In addition, the OptiX OSN 500 supports various Ethernet protection, operating, and maintenance functions.

Release documents of the OptiX OSN 500