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Zte ZXR10 5900 Product Description

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  • Page 1 ZXR10 5900 5200 Product Description...
  • Page 3 Updating format © 2010 ZTE Corporation. All rights reserved. ZTE CONFIDENTIAL: This document contains proprietary information of ZTE and is not to be disclosed or used without the prior written permission of ZTE. Due to update and improvement of ZTE products and technologies, information in this document is subjected to change without notice.

  • Page 4: Table Of Contents

    Brief Introduction to QoS ..................28 3.19.2 QoS Technology for ZXR10 59/52 switch series ............. 32 3.19.3 QoS Applications ....................40 System Architecture ..................... 42 Product Physical Structure ..................42 © 2010 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary...
  • Page 5 Typical Networking ....................67 The Type and Specification of Cable and Fiber ..........68 Model and Specification of Cable ................68 Model and Specification of Fiber ................68 Acronyms and Abbreviations ................69 ZTE Confidential Proprietary © 2010 ZTE Corporation. All rights reserved.
  • Page 6 The functions of the indicators on the panel of 1-port 10GE interface board ....48 Table 7 Models and Specifications of Cable ................68 Table 8 Specifications of 1000BASE-SX Fiber ..............68 Table 9 Acronyms and Abbreviations ..................69 © 2010 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary...

  • Page 7: Overview

    As Ethernet switches provide broad range of services and deliver much higher performance, they have been finding applications on increasingly more IP networks. ZXR10 59/52 series L3 Gigabit Intelligent Switch launched by ZTE CORPORATION is mean to fully satisfy IP routing/switching and high QoS assurance needs. This series support complete IPv4 and IPv6 routing protocols, VLAN control, Ethernet switching, QoS assurance mechanisms, traffic control, 802.1x, and anti-virus protection, as well as...

  • Page 8: Table 1 Basic Features Of Zxr10 59/52 Intelligent Secure Ethernet Switch

    5224: 35.7M Number of entries in the routing table: for 59-series, 16K (L3) for 52-series, 4K (L3) MAC address table size: 5952/5252/5928/5928-PS/5928-FI/5228/5228-FI: 16K 5224: 8K Number of slots ZXR10 5952/5252/5928/5928-PS/5228/5928-FI/5228-FI: slots © 2010 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary...
  • Page 9 ZXR10 5900 5200 Product Description Item Description L2 protocol support Support IEEE 802.3, IEEE 802.3u, IEEE 802.3z, IEEE 802.3ae, IEEE 802.3x, and IEEE 802.1p, etc. Support IEEE 802.1d STP, IEEE802.1w RSTP, IEEE802.1s MSTP protocols Support IEEE 802.3ad LACP link aggregation Support IEEE802.1Q , VLAN number: 4094...
  • Page 10 5952/5252 43.6(H)*442(W)*400(D) 5928/5928-PS/5228 43.6(H)*442(W)*360(D) 5928-FI/5228-FI 43.6(H)*442(W)*320(D) 5224 43.6(H)*442(W)*280(D) Weight: 5952/5252 <12kg 5928/5228/5928-FI/5228-FI <8kg 5928-PS<9kg 5224 <6kg Environmental Operating temperature: -5°C~+45°C Requirements Storage temperature: -40°C~+70°C Operating relative humidity: 5%~95%, non-condensing © 2010 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary...

  • Page 11: Highlights

    “High-Performance IPv6 Forwarding Platform” project belonging to State 863 Project Packet. From April 2nd to April 4th 2003, ZTE joined in “Global IPv6 Peek Forum 2003” and showed its new IPv4/v6 dual-stack router and IPv6 network solution. In May 2004, ZTE high-end router successfully passed MII (Ministry of Information Industry) IPv6 network access test.
  • Page 12 It can implement operation and maintenance management for one VLAN per user, which brings great convenience to network management and maintenance. ZTE is always an advocator of this technology and takes the leading position in the industry.

  • Page 13: Figure 1 User Vlan Tag Message

    ZXR10 5900 5200 Product Description Figure 1 User VLAN Tag Message Figure 2 shows the adoption in L2 VPN of small network, or QinQ-based Tunnel or QinQ-based VPN. Figure 2 User Band VLAN Tag Message In Figure 2, when customer messages with or without inner VLAN labels reach Ingress...

  • Page 14: Innovative Vct Technology

    Besides, it can calculate the distance of the failed point of the link. By using VCT technology, ZTE ZXR10 59/52 series Ethernet switches can carry out remote maintenance to links to find out the open circuit, break circuit and the error for detecting fault location is within 1 meter.

  • Page 15: Redundant Power Supply System

    If the authentication is passed, then set up PPP link, so that both sides in the communication can implement PPP data transmission. The VBAS protocol of ZTE ZXR10 59/52 series Ethernet switches has the following merits: There’s no need of hardware upgrade. With few changes, only software upgrade on ...

  • Page 16: Stacking Function

    Superior Extensibility: IRF stacking is capable of fitting different users’ demands and  guarantees smooth network extensibility, which maximally protects investment in network upgrade. N+1-mode backup features high reliability, which avoids single-point failure and  reduces service breakdown. © 2010 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary...

  • Page 17: Supporting Iptv

    Supporting IPTV As a key technology of ZTE IPTV system, controllable multicast technology is mainly used in broadband access network. The device (BRAS, DSLAM or Switch) realizing multicast control policy is called multicast control point. The multicast control point working as the ultimate point of user multicast IGMP query determine if multicast traffic will be duplex to customer port as per related IGMP query and control policy.
  • Page 18 ZXR10 5900 5200 Product Description  Support IP source Guard.  Support hierarchical user management, user encryption and SSH. © 2010 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary...

  • Page 19: Functionality

    ZXR10 5900 5200 Product Description Functionality MAC Address Management For ZXR10 59/52 series, all forwarding tables and MAC addresses are closely related, therefore MAC management module is the most fundamental as well as the most important functional module in the Ethernet switch, since it performs basic functions...

  • Page 20: Qinq

    Promiscuous port but also with another Community Port. The Promiscuous Port is connected to an interface of another router or L3 switch. The traffic it receives can then be forwarded to an isolated port or Community port. © 2010 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary...

  • Page 21: Vlan Translation

    ZXR10 5900 5200 Product Description Using PVLAN can be very effective for ensuring the security of data communication in the network. A user only needs to connect its default gateway. One PVLAN can provide connections with L2 data communication security without multiple VLAN and IP subnet.

  • Page 22: Link Aggregation

    Port Mirroring Port mirroring can automatically mirror traffic from one port to another, so that network administrator can take a real-time analysis of the port traffic for detecting network faults, © 2010 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary...

  • Page 23: Igmp Snooping

    ZXR10 5900 5200 Product Description and offers a monitoring mechanism for network management personnel. For ZXR10 59/52 series, any port can be configured as a mirror port. Mirroring is also possible between ports operating at different rates. It is also possible to mirror traffic from multiple ports to one port, and mirroring can be enabled as multiple mirroring groups.

  • Page 24: Vrrp Protocol

    The main features of ZXR10 59/52 series RIP protocol are:  It can send and receive RIP message as per protocol, in addition, it can message verification and implement ID authentication. © 2010 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary...

  • Page 25: Ospf Protocol

    ZXR10 5900 5200 Product Description  Support RIPV1/V2, authentication and MD5 authentication. Support route redistribution.  Support Split-Horizon and event-based updated to avoid routing loops and fast route convergence. Support protocol-level DEBUG.  3.13.2 OSPF Protocol OSPF, an interior gateway protocol developed by IETF, is based upon link status and shortest path first (SPF) algorithm.

  • Page 26: Is-Is Protocol

    It is suitable for large network, normally for backbone network.  BGP supports EBGP and IBGP.  BGP supports EBGP multi-hop technology.   Support peer-group feature and route reflector. © 2010 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary...

  • Page 27: Ipv4 Multicast Routing Protocol

    ZXR10 5900 5200 Product Description  Support AS confederation, route flap dampening.  Support MP-BGP.  Support MD5 authentication, routing filtering.  Support route redistribution. 3.14 IPv4 Multicast Routing Protocol 3.14.1 IGMP protocol IGMP protocol is used by multicast router between host and the multicast router for getting information of multicast group member.
  • Page 28 , it can switch the share tree to source-based STP. As soon as the switchover occurs, the router will send a graft message to upstream neighbor asking it to leave the share tree. © 2010 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary...

  • Page 29: Pim-Snooping

    ZXR10 5900 5200 Product Description 3.14.3 PIM-Snooping PIM Snooping multicast protocol sense get multicast route port and user port by sensing HELLO and JOIN/PRUNE message of multicast protocol, so that multicast data can be forwarded and network traffic can be reduced.

  • Page 30: Ipv6 Routing Protocol

    Currently, the popular routing protocols are RIP, OSPF, BGP and IS-IS, etc. In the coming IPv6 time, these routing protocols running based upon IPv4 should be extended to support IPv6 technology. ZTE ZXR10 5900 supports many IPv6 routing protocols, i.e. BGP4+, RIPng, OSPFv3, and IS-IS v6.

  • Page 31: Standard Acl

    ZXR10 5900 5200 Product Description 3.18.1 Standard ACL Standard ACL only filters L3 IP source addresses. In practice, most ACLs only perform filtering based on IP source addresses, so that by putting such ACL put into the same category, it can allow network administrators to manage the network easily. For example, the network administrator only allows users in Vlan5, and a couple of managers on other network segments to access the Internet.

  • Page 32: L2 Acl

    L2 ACL mainly perform filtering on the fields in L2 header, including source MAC, destination MAC, Ethernet protocol type, VLAN label and VLAN priority. L2 ACL is mainly used for access control over the same network segment. For cases where it is © 2010 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary...

  • Page 33: Hybrid Acl Technology

    ZXR10 5900 5200 Product Description not necessary to know the IP address or a protocol other than IP is used, some network resources can be protected by filtering L2 MAC addresses and VLAN labels. For example, on the network segment in the R&D department, some computers are used for experiment, and they have no fixed IP addresses.

  • Page 34: Qos Technology

    QoS can control various network applications and meet the requirements of various network applications.  Controlling the resource: for example, bandwidth used on backbone FTP can be restricted. The access to database can also be offered with higher priority. © 2010 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary...
  • Page 35 ZXR10 5900 5200 Product Description  Customized service: users of an ISP (Internet Service Provider) probably will send out voice, video-sending or other real-time services. QoS enables ISP to differentiate the different packets and provide different services. Coexistence of various requirements: it can provide bandwidth and low delay ...
  • Page 36 DS code point domain of IP packet header, which is called DSCP (Differentiated Services Code Point). The internal nodes provide scheduling and forwarding services of different quality based on DSCP. © 2010 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary...
  • Page 37 ZXR10 5900 5200 Product Description  MPLS (Multi-Protocol Label Switch): To provide bandwidth management of stream aggregate through network path control based on marking on packet headers.  SBM (Subnet Bandwidth Management): in charge of the classification and prioritization of L2 (data link layer), and share and exchange information with IEEE 802 network.

  • Page 38: Qos Technology For Zxr10 59/52 Switch Series

    64 types with the packets marked with Differentiated Services Code Point (DSCP, the first six digits of the ToS field). When the packets have © 2010 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary...

  • Page 39: Figure 4 Fifo Scheduling

    ZXR10 5900 5200 Product Description been classified, QoS features can be applied to the different types, to perform class- based congestion management and traffic shaping. Network administrators can configure the policy for classifying packets. This policy not only includes in-band identifications parameters such as IP priority or DSCP value of IP packet and CoS value of 802.1p, but can also specify input interface, source address,...

  • Page 40: Figure 5 Sp Scheduling

    3. Weighted Round Robin Queuing, WRR Figure 6 WRR scheduling © 2010 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary...

  • Page 41: Figure 7 Wrr Scheduling

    ZXR10 5900 5200 Product Description As shown in Figure 6, the WRR classifies the packets according to such conditions as VLAN CoS value, IP packet priority/DSCP, and n-tuple, ultimately into eight types that respectively belong to one of the eight queues of the WRR. Then it sends the packets into the corresponding queues according to the type of the packet.
  • Page 42 Therefore average queue length is used instead for comparing with the user-configured threshold to decide dropping. Here the average queue length refers to the result of the queue length being filtered by © 2010 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary...

  • Page 43: Figure 9 Relationships Between Wred And Queue Mechanism

    ZXR10 5900 5200 Product Description low-pass. It can both indicate the changing trend of the queue, and be insensitive to burst changes of queue length, and avoid unfair treatment to those data flows. WRED is aware of in-band QoS identifications such as IP priority and DSCP, and can set the packets of different IP priorities or DSCP with different queue length filtering parameters, queue thresholds, and drop probability etc., thus it offers different dropping...

  • Page 44: Figure 10 Basic Processing Of Traffic Control In Cir

    Traffic policy can give different traffic characteristics and marking characteristics for different packet categories, that is, to classify packets and provide different packets with appropriate traffic characteristics and marking characteristics. © 2010 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary...

  • Page 45: Figure 11 Ts Processing

    ZXR10 5900 5200 Product Description 3.19.2.5 Traffic shaping Traffic shaping is typically used to restrict traffic and burst for a connection of a network, so that these packets can be forwarded at a smoother rate. Traffic shaping is usually implemented by buffer and token bucket. When packets are being sent too fast, they are first cached into the buffer, before they can be sent at a constant speed under the control of token bucket.

  • Page 46: Qos Applications

    The SP queue scheduling algorithm puts voice packets into high-priority queues, ensuring them to be scheduled first in case of congestion. The queue scheduling mode of SP and WRR combined can also be used, as shown in Figure 13: © 2010 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary...

  • Page 47: Figure 13 Voip Support

    ZXR10 5900 5200 Product Description Figure 13 VOIP Support In the applications of the three networks integrated, traffics on the router are classified into the three categories of voice, video and data, and these categories are set with different priorities with the coloring function of traffic policing. At the same time, the SP...

  • Page 48: System Architecture

    RJ45 socket with the Console interface. Table 2 shows the attributes of MGT port. GE port supports adaptive 10/100/1000Mbps Ethernet. Packets from GE port will go to packet processor (PP) after being sent to PHY and MAC of main control board, © 2010 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary...

  • Page 49: Table 2 Attributes Ethernet Electric Interface On The Front Panel Of Zxr10

    ZXR10 5900 5200 Product Description then PP will forward those packets as per their different MAC address and IP address. All the ports support wire-speed processing, Table 2 below shows their attributes. Table 2 Attributes Ethernet electric interface on the front panel of ZXR10...

  • Page 50: Hardware Architecture

    10G uplink interfaces. ZXR10 5928-FI/5228-FI designed with 1U appearance, where the front panel supports 20*1000Mbps optical interfaces and 4 *1000Mbps optical/electrical adaptive port, and the rear panel provides four service © 2010 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary...

  • Page 51: Switching And Control Module

    ZXR10 5900 5200 Product Description slots that support four Gigabit uplink interfaces. ZXR10 5224 is designed with 1U appearance, where the front panel supports 20*1000M electrical interface and 4*1000M optical/electrical adaptive interface. The system of ZXR10 5952/5252/5928/5928-PS /5228/5928-FI/5228-FI/5224 consists of one main control board and some service cards.

  • Page 52: Power Supply Module

    ZXR10 59/52 series switch support cable diagnoses feature by which the connections of all the cables can be detected at any time, short circuit and open circuit of the cable can © 2010 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary...

  • Page 53: Figure 22 The Functional Block Diagram For 1-Port 10Ge Interface Board

    ZXR10 5900 5200 Product Description be diagnosed immediately. In addition, the failure part can be located as precise as within 1 meter. 4.2.3.1 1-Port 10GE Interface Board  Working Principle There are two types of 1-port 10GE interface board: one can provide single-port 10G XFP Ethernet optical interfaces, the other can provide single-port 10G CX4 Ethernet electrical interfaces.

  • Page 54: Software Architecture

    The system software is required to support the following functions: © 2010 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary...
  • Page 55 ZXR10 5900 5200 Product Description  Support fundamental L2 protocols, including 802.1D STP protocol, 802.1P priority control, related functions of 802.1Q VLAN, and 802.3ad link aggregation  Support IPv4 protocol stacks and basic routing protocols Support higher layer services, e.g. ACL and DHCP ...

  • Page 56: Figure 25 The Functional Block Diagram For The Operation Support Subsystem

    MUX. The measurement and monitoring function measures the status of hardware driver layer, physical layer and MUX layer, measures packets received/sent, monitors access to the register, performs sniff operations to the data packets, and provides OAM module with interface function. © 2010 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary...

  • Page 57: Figure 26 Functional Block Diagram Of L2 Subsystem

    ZXR10 5900 5200 Product Description 4.3.1.3 L2 Sub-System The L2 subsystem mainly performs configuration management on the data link layer (management layer), L2 protocols processing (control layer), data forwarding (data layer or service layer) etc. The module functions are illustrated in the following diagram.

  • Page 58: Description Of Various Layers

    AppleTalk are not supported. 4.3.2.3 Upper-Layer Protocol Software This refers to the protocols on top of IP:  Supports TCP and UDP.  Supports unicast routing protocols including RIPv1/v2, OSPF, IS-IS and BGP. © 2010 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary...

  • Page 59: Functional Modules Description

    ZXR10 5900 5200 Product Description  Supports multicast routing protocols including IGMP, DVMRP, PIM-SM, PIM-DM and MSDP.  Supports application protocols including TELNET, FTP, and TFTP. 4.3.3 Functional Modules Description The software is divided into multiple functional modules as shown in Figure 28 Figure 28 Software functional modules of ZXR10 59/52 series 4.3.3.1...
  • Page 60 This module provides four priorities, the message processing of which is performed by using the existing algorithms of the ROS (message queue is divided into © 2010 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary...
  • Page 61 ZXR10 5900 5200 Product Description four priority classes, and messages of different priorities are accepted and rejected based on the depth of the message queues dynamically monitored), and different algorithms (for example, strict priority, weighted round robin, etc.) are used for the implementation.
  • Page 62 RADDISK. Version upgrade is simple, thus remote version upgrade can be done easily. © 2010 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary...
  • Page 63 ZXR10 5900 5200 Product Description 4.3.3.2 SSP Switching Sub-system The target of the SSP switching subsystem is the Ethernet switching chipset in the system. Its major functions are to initialize the hardware, collect configuration, collect status and statistics information, and exchange packets between the CPU and the switch chipset.
  • Page 64 IP forwarding layer, so that ZXR10 59/52 series products can provide unicast IP packet forwarding. As Figure 29 shows, the unicast routing sub-system contains the following modules: © 2010 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary...

  • Page 65: Figure 29 Functional Block Diagram Of The Unicast Routing Protocol Subsystem

    ZXR10 5900 5200 Product Description Figure 29 Functional Block Diagram of the Unicast Routing Protocol Subsystem OSPF OSPF IS-IS IS-IS Protocol Protocol Protocol Protocol Protocol Protocol Protocol Protocol Module Module Module Module Module Module Module Module Unicast Protocol Interaction Module Unicast Protocol Interaction Module 4.3.3.6...
  • Page 66 MAC address flood protection, for which it limits the number of MAC addresses of the ports  Setup broadcast packet threshold of the ports Mixed ACL filtering of L2, L3, and L4  © 2010 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary...
  • Page 67 ZXR10 5900 5200 Product Description  Route filtering  Disables ICMP redirection function and prevents the attackers from sending false ICMP packets Prevents DoS (Denial of Service) attacks  4.3.3.10 Maintenance and Management Subsystem During the running of the routing switch, users must be able to monitor its running status and that of the whole network in real time.
  • Page 68 Intra-chipset self-loop: it is mainly adopted to detect if a major chipset on the  board is working in the right way.  Line self-loop: it is mainly adopted to detect if the data transmission of the line side is going smoothly. © 2010 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary...

  • Page 69: Technical Specifications

    ZXR10 5900 5200 Product Description Technical Specifications The basic functions and specifications of ZXR10 59/52/59/52-FI L3 Intelligent Ethernet switches are: Physical Specifications Size:   5952/5252 44(H)*442(W)*400(D)  5928/5928-PS/5228 44(H)*442(S)*360(D) 5928-FI/5228-FI 44(H)*442(W)*320(D)  5224 44(H)*442(W)*280(D)  Weight:  5952/5252 <12kg ...
  • Page 70 52 series switches support IGMP multicast routing protocol.  Bandwidth Control: Bandwidth control can be realized based on port,  implementation and traffic. The controlled granularity is 64K.  Authentication: Support 802.1x and RADIUS Client functions. © 2010 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary...

  • Page 71: Power Supply Specification

    ZXR10 5900 5200 Product Description  DHCP: Support DGCP Relay and DHCP Server functions. POE: 5928-PS supports POE, IEEE 802.3af, power <30W every port. Max  support port number 24. The whole support power 820W QOS Function   Support 8 priority queues ...

  • Page 72: Reliability

    ZXR10 5900 5200 Product Description Reliability MTBF: >100000 hours MTTR: <30 minutes ZXR10 59/52-FI supports extra 12V DC power supply for redundant backup. © 2010 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary...

  • Page 73: Typical Networking

    ZXR10 5900 5200 Product Description Typical Networking Implementations in the Access Layer of MAN: ZXR10 59/52 L3 intelligent Ethernet switch is suitable for the access layer of MAN running as community switch. In such circumstance, 59/52 series switches in the access layer connecting with users directly provide rich bandwidth and access management as shown in Figure 30.

  • Page 74: The Type And Specification Of Cable And Fiber

    Specifications of 1000BASE-SX Fiber Fiber Diameter Fiber Bandwidth Maximum Fiber Length 160 MHz/km 220 m 62.5/125 micron MMF 200 MHz/km 275 m 400 MHz/km 500 m 50/125 micron MMF 500 MHz/km 550 m © 2010 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary...

  • Page 75: Acronyms And Abbreviations

    ZXR10 5900 5200 Product Description Acronyms and Abbreviations Table 9 Acronyms and Abbreviations Abbreviations Full Characteristics Global System for Mobile communications EDGE Enhanced Data rates for GSM Evolution WCDMA Wideband Code Division Multiple Access Core Network GERAN GSM Edge Radio Access Network...
  • Page 76 Channel Element Transport Network Sub-system Radio Control Sub-system Data Base Sub-system Base Band Sub-system Barrier Sub-system BRACS Barrier Access Control Sub-system Operating And Maintenance Local Maintenance Terminal Operation Support Sub-system © 2010 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary...
  • Page 77 ZXR10 5900 5200 Product Description Abbreviations Full Characteristics VxWorks Winder River provided OS Board Support Package System Control Sub-system Network Optimization & Planning MTBF Mean Time Between Failures MTTR Mean Time To Recovery NetNumen CORBA Common Object Request Broker Architecture...

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