Huawei OSN 7500 multi-service optical transmission system equipment

The OptiX OSN 7500 intelligent optical switching system (the OptiX OSN 7500 for short) is the next-generation intelligent optical core switching (OCS) equipment and is developed by

Huawei on the basis of the current situation and development trend of the metropolitan area network (MAN).
The OptiX OSN 7500 is mainly used as a service scheduling node at the metropolitan backbone layer. That is, it functions as optical core switching equipment (OCS). As an intelligent optical transmission platform and core optical transmission system, the OptiX OSN 7500 is located at the metropolitan backbone layer to schedule and transmit services of different types and granularities.

In packet mode, the OptiX OSN 7500 supports the following technologies:
• Multiprotocol Label Switching Transport Profile (MPLS-TP)
• Multiprotocol Label Switching (MPLS)
• ETH PWE3
• TDM PWE3
• ATM PWE3

In TDM mode, the OptiX OSN 7500 supports the following technologies:
• Synchronous digital hierarchy (SDH)
• Plesiochronous digital hierarchy (PDH)
• Ethernet
• Asynchronous transfer mode (ATM)
• Storage area network (SAN)/Video
• Wavelength division multiplexing (WDM)
• Digital data network (DDN)

The OptiX OSN 7500 is a high-end product in the next generation SDH(NG-SDH). The network application scenarios are described as follows:

•    In TDM networking, can be networked with the other OptiX transmission equipment(OptiX OSN 7500 II, OptiX OSN 9560, OptiX OSN 9500, OptiX OSN 3500, OptiX OSN 3500 II, OptiX OSN 2500, OptiX OSN 1500, OptiX OSN 500, and OptiX OSN 550) to optimize the carrier's investment, achieving a full range of networking solutions at the access layer, convergence layer, and backbone layer.
•    With the packet switching technology, the OptiX OSN 7500 can constitute a packet data
transmission network with the other OptiX transmission equipment (the OptiX OSN 7500II, OptiX OSN 3500, OptiX OSN 1500, OptiX OSN 500, OptiX OSN 550, OptiX PTN 910, OptiX PTN 950, OptiX PTN 1900, OptiX PTN 3900, and OptiX RTN 900) to meet the requirement for bearing IP services.
•   Can be flexibly networked with WDM equipment and Metro equipment.
•   Can be networked with intermediate third-party Layer 2 networks, allowing end-to end configuration and management.

1. Universal Switch Architecture for Multiservice Grooming

OptiX OSN equipment uses a universal switch architecture for unified grooming of packet services and TDM services. OptiX OSN equipment can work in packet mode, TDM mode, or dual-domain (packet+TDM) mode.
The three modes can be smoothly switched by upgrading the software of a service board so carriers' requirements on services and networks can be met. The smooth switching between the three modes supports carriers' distributed smooth investment based on the development of the technology and industrial chain.
Based on a universal switch architecture, OptiX OSN equipment uses the packet transmission
technology to perform efficient statistical multiplexing on data services so the transmission cost of every bit is reduced. In addition, OptiX OSN equipment uses the Native technology to transmit TDM services so voice services are transmitted with high quality.

Based on a universal switch architecture, OptiX OSN equipment unifiedly transmits packet services such as 2G, 3G, and VIP private line services so network overlapping is avoided. In addition, OptiX OSN equipment transmits TDM services. Carriers can constitute an end-to-end packet network, dual-domain (packet+SDH) network, or hybrid (MSTP+routers) network that bears L2+L3 services. This complete packet transmission solution allows an evolution from TDM networks to all-IP networks.

2. Hierarchical OAM Facilitating Fault Detection

The Hybrid MSTP equipment supports hierarchical OAM to rapidly detect and locate various faults, thereby improving network reliability. In addition, the Hybrid MSTP equipment supports distributed OAM and centralized OAM.

• Application of Hierarchical OAM

• Distributed OAM and Centralized OAM

Distributed OAM: OAM messages are extracted and processed on service processing boards.
Centralized OAM: OAM messages are extracted from service processing boards and then sent to a cross-connect board for centralized processing.MPLS OAM can be distributed or centralized. MPLS-TP OAM can only be centralized. Before switching MPLS OAM to MPLS-TP OAM, ensure that MPLS OAM is centralized.

3. TP-Assist Solution Facilitating the O&M of Packet Services

Like the SDH equipment, Huawei Hybrid MSTP equipment supports a hierarchical operating & maintenance (O&M) system by using the TP-Assist solution, so packet services can be configured, commissioned, or maintained in an end-to-end manner.

4.Built-In WDM, Flexible Networking

The OptiX OSN equipment uses the built-in WDM technology to transmit several wavelengths over one optical fiber. In this manner, the OptiX OSN equipment can be interconnected with the WDM equipment. 

  Composition of the OptiX OSN 7500

Units supported by the OptiX OSN 7500

• Cabinet

The cabinet that complies with ETSI standards is used for housing OptiX OSN 7500 subracks.A PDU is installed on the top of a cabinet to access -48 V or -60 V power.

There are 300 mm and 600 mm ETSI cabinets, of which 300 mm ETSI cabinets are available in two types: T63 cabinets and N63E cabinets.

• Subrack

The functions of the areas are as follows:
•  Interface board area: This area houses the interface boards of the OptiX OSN 7500.
•  Upper-layer processing board area and lower-layer processing board area: These areas
house the processing boards of the OptiX OSN 7500.
•  Fan area: This area houses three fan modules, which dissipate heat generated by the
equipment.
•  Cable routing area: This area houses fiber jumpers in a subrack.

• board

The equipment supports Cross-Connect Boards and System Control Boards, Packet Processing Boards, Packet Interface Boards, EoD Boards, SDH Boards, PDH Boards, EoS Boards, ATM Boards, RPR Boards, SAN/Video Boards, WDM Boards, Optical Amplifier Boards and Dispersion Compensation Boards, Auxiliary Boards, Power Boards.