ZTE´s UnitransTM Series Optical Transport Systems

2003-12-12    

ZTE offers a series of transport products covering high-end and low-end devices:

High-end devices----UnitransTM ZXWM-32 DWDM (Dense Wavelength Division Multiplexing) Optical Transport System, UnitransTM ZXSM-10G SDH/SONET (Synchronous Digital Hierarchy/Synchronous Optical Network) Optical Transport System, UnitransTM ZXSM-2500E SDH/SONET Optical Transport System, and UnitransTM ZXSM-150/600/2500 SDH/SONET Optical Transport Systems
Low-end devices----UnitransTM ZXSM-150/600C Compact SDH/SONET Optical Transport System, and UnitransTM ZXSM-10 Intelligent PCM Device.

These transport devices are used in nationwide and regional backbones, local loop networks, and access networks. For more information on UnitransTM ZXWM-32 DWDM Optical Transport System and its applications, see Applications of UnitransTM ZXWM-32 DWDM Optical Transport System.

UnitransTM ZXSM-10G SDH/SONET Optical Transport System

UnitransTM ZXSM-10G SDH/SONET Optical Transport System offers high data rate and large capacity, which meets the present and the future requirements for backbone, local loop network and Metropolitan Area Network (MAN).

UnitransTM ZXSM-10G SDH/SONET Optical Transport System, compatible with mappings defined by ETSI (European Telecommunications Standards Institute) and ANSI (American National Standards Institute), features 512 x 512 equivalent VC-4 cross connects on a single sub-frame. It offers multiple interfaces, such as STM-1/OC-3 (155.52 Mbps) electric/optical, STM-4/OC-12 (622.08 Mbps) optical, STM-16/OC-48 (2,488.32 Mbps) optical, STM-64/OC-192 (9953.28 Mbps) optical, E4 (139.264 Mbps) electric, 10/100-Mbps Ethernet, and Gigabit Ethernet. Dense interface cards are available for non-Pleisiochronous Digital Hierarchy (PDH) delivery, such as Asynchronous Transfer Mode (ATM) and Internet Protocol (IP) traffic.

UnitransTM ZXSM-10G SDH/SONET Optical Transport System uses bits of Section Overhead (SOH) to offer excess interfaces, featuring flexible add/drop. Application Specific Integrated Circuits (ASICs) are used to ensure performance. In addition to that, the optical transport system delivers quality of service (QoS), selective in-band and out-of-band Forward Error Correction (FEC) functionalities.

UnitransTM ZXSM-2500E SDH/SONET Optical Transport System

UnitransTM ZXSM-2500E SDH/SONET Optical Transport System is compatible with the mappings defined by ETSI and ANSI.

UnitransTM ZXSM-2500E SDH/SONET Optical Transport System offers 256 x 256 equivalent VC-4 cross connects on a single sub-frame. This large cross connect matrix enables the optical transport system to feature strong service schedule and bandwidth management.

UnitransTM ZXSM-2500E SDH/SONET Optical Transport System offers multiple interfaces, such as STM-1/OC-3 electric/optical, STM-4/OC-12 optical, STM-16/OC-48 optical, E1/T1, E3/T3 PDH electric, 10/100-Mbps Ethernet, and Gigabit Ethernet. Dense interface cards are available for non-Pleisiochronous Digital Hierarchy (PDH) data delivery, such as IP and ATM services.

UnitransTM ZXSM-2500E SDH/SONET Optical Transport System supports AU4-4C/16C cascade for non-PDH delivery, such as ATM and IP traffic.

UnitransTM ZXSM-2500E SDH/SONET Optical Transport System based on IP over SDH and Ethernet over SDH offers 10/100 Ethernet and Gigabit Ethernet interfaces for ATM and IP delivery.

UnitransTM ZXSM-2500E SDH/SONET Optical Transport System offers three service call channels, one of which provides the DWDM or multiple-vendor devices with a transparent voice channel.

UnitransTM ZXSM-2500E SDH/SONET Optical Transport System features redundant design in hardware. Dual bus architecture enhances reliability. Cross connect card, timer card, and power supply for the transport system work in fault-tolerant mode.

UnitransTM ZXSM-2500E SDH/SONET Optical Transport System is shipped with multiple protections: Unidirectional Path Switched Ring (UPSR), Bidirectional Line Switched Ring (BLSR), Dual Node Interconnection (DNI), Subnet Connection Protection (SNCP), and Logic Subnet Protection. Excess overheads can be used to expand K1 and K2, setting up multiple switching rings on one device.

UnitransTM ZXSM-2500E SDH/SONET Optical Transport System supports transparent overhead traffic delivery. Low-speed traffic and overheads are transparently delivered on the STM-16 and STM-4 frames. This facilitates central network management.

UnitransTM ZXSM-150/600C Compact SDH/SONET Optical Transport System

UnitransTM ZXSM-150/600C Compact SDH/SONET Optical Transport System offers reliability, scalability, and cost-efficiency. It´s shipped with multiple interfaces to meet specific requirements.

UnitransTM ZXSM-150/600C Compact SDH/SONET Optical Transport System features:

  • Supporting STM-1 and STM-4, migratory to STM-4 from STM-1
  • Mappings defined by ETSI and ANSI
  • Up to 2 STM-4 or 4 STM-1 wavelengths, supporting tangent and intersectional rings with other SDH device
  • Building Integrated Timing Source (BITS) interface supporting Source Specific Multicast (SSM), and 2-Mbps tributary retiming
  • Redundant design----hot backup for key cards such as cross connection, timing, and power supply, 1:N protection for tributary units, channel and multiplexing segment protection

DWDM Transport Systems

DWDM Transport Systems of ZTE offer up to 40 optical channels on a single fiber, delivering 400 Gbps of system capacity.

The DWDM transport systems consist of Optical Terminal Multiplexer (OTM) and configurable 8-wavelength Optical Add/Drop Multiplexer (OADM) network elements. They support chain, cross, and ring topologies. They feature Unidirectional Path Switched Ring (UPSR) and Bidirectional Line Switched Ring (BLSR), with less than 20 milliseconds of switching delay.

Optical Transmitter Unit (OTU) for the DWDM transport systems offers stable optical sources and wavelengths, powerful reshaping, regeneration and retiming functionalities, interfaces with ATM User-Network Interface (UNI) and Gigabit Ethernet, and exterior modulation and dispersion control techniques ensuring long-haul transport up to 640 kilometers without any regenerator, and over 20 thousand kilometers with generators.

The optical multiplexer and demultiplexer comprise couplers, media-film gratings, and array waveguide gratings (AWG). The optical demultiplexer features excellent isolation to avoid crosstalk among multiple wavelengths.

The Erbium-Doped Fiber Amplifier (EDFA) features adjustable power and smooth gain characteristics. Custom EDFAs with various gains and spans (80/100/120/160) are available on demand.

The Optical Supervisory Channel (OSC) for the optical transport system works with 1,510-nm wavelength at 2 Mbps, delivering various alarms, and K1 and K2 overhead traffic. This function can interact with Error Correction Codes (ECC) of SDH.

Transport Manager

Transport Manager of ZTE manages DWDM and SDH transport platforms in one box.

At network element layer, SDH is based on ECC, while DWDM on OSC. Their transport mechanisms and management differs from each other. Both these two platforms are managed at network management layer via standard-based Q3 interface. Information model for DWDM is to be consummated by International Telecommunications Union (ITU).

The transport manager performs configuration, performance, failure, security, and accounting management. It features automatic and manual timeslot configuration for complicated topologies, and remote database download for online expansion and upgrade. The transport manager calculates service interruption and unnegligible transport damage durations for accounting.

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