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(Click for frequent words.) 66 NSEs 63 IDT NSE 61 QDRII + 59 Mbit nvSRAM 59 embedded SERDES 58 serializer deserializer 58 XAUI interface 58 I2C serial 58 Optical Switch 58 Intel IXP# [001] 57 Actel IGLOO 57 Infiniium 57 LoopStar 57 AEL# 57 WinPath 57 3G DigRF 57 Interface API 57 SDIO interface 56 mux demux 56 USART 56 Vector Signal Analyzer 56 #Kbyte [002] 56 Freescale MPC#E 56 nP# 56 Network Adapters 56 I2C serial interface 56 CMOS RF transceiver 56 ARM9 core 56 GHz RF transceiver 56 Physical Layer PHY 56 Cadence Incisive 56 Blackfin Processors 56 NOR Flash Memory 56 bit RISC processor 56 MIPS# #KE 56 DDRII + 56 AVANTA 55 OCT# [003] 55 TCS# 55 OTU3 55 ProASIC Plus 55 ProSLIC 55 #/#BaseT Ethernet 55 Octeon 55 HTTP SOAP 55 Microchip PIC 55 radioOne 55 SDRAMs 55 embedded processor cores 55 PCI Express Fibre Channel 55 AM#x 55 #/#/#BASE-T 55 PCI Express PHY 55 framer mapper 55 Kontron AM# 55 uC 55 dynamically reconfigurable 55 Silicon Labs Si#xx 55 MoSys Bandwidth Engine 55 Universal Asynchronous Receiver 55 AirMaestro 55 RS# interfaces 55 EtherNID TM 55 Ethernet GbE 55 RISC microprocessor 55 FPGA DSP 55 RFX# 54 Atmel ARM9 54 TCI# 54 OCT# Series 54 MachXO 54 #Kbyte [001] 54 glueless interface 54 Interphase iSPAN 54 QDRII 54 parameterized cells 54 ARM# [001] 54 Theseus Titanium 54 Analog Devices Blackfin 54 #GbE SFP + 54 Atmel AVR# 54 ARM# core [001] 54 #x#G [001] 54 RocketIO TM 54 JTAG emulator 54 synchronous SRAMs 54 ColdFire V1 54 EoS 54 UART interface 54 M#K 54 Freescale MC# 54 Intel XScale ® 54 ARM Cortex M4 54 please visit www.EXFO.com 54 #/#BaseT 54 Altera Stratix II 54 Demux 54 USB #.#/#.# 54 4Mbit 54 embedded microcontroller 54 NET Remoting 54 OMAP Vox platform 54 EZRadioPRO 54 FCoE CNAs 54 serializer deserializer SerDes 54 Altera Stratix IV 54 T1 E1 54 iMB 54 seamlessly interoperates 54 CY#C#x# 54 ProASIC3 FPGAs 54 MIPS# #K 54 asynchronous SRAM 54 Ethernet MACs 54 PIC microcontroller 54 QUALCOMM QPoint 54 SystemC modeling 54 customizable dataplane processor 54 TMS#C#x + 54 MPC#D processor 54 Actel ProASIC3 54 nvSRAM 53 nvSRAMs 53 daughtercards 53 Optical Module 53 MSC#x 53 IXP# [001] 53 6MB L3 cache 53 Memory Controller 53 ZigBee protocol 53 nanoPHY IP 53 AXI TM 53 inverse multiplexing 53 ARM7 processor 53 XA Spartan 3A 53 Ikanos Fusiv 53 Packet Processor 53 Kbyte Flash 53 ANX# 53 6U VMEbus 53 ARM#E 53 Evaluation Module 53 HyPHY 53 KB SRAM 53 Simulink models 53 OCDemon 53 Tensilica Xtensa 53 Blackfin processor 53 XMC module 53 transimpedance amplifier 53 TMS#DM# [002] 53 Wireless Cable Modem 53 NX3 53 PulSAR 53 Freescale QorIQ 53 Imagination PowerVR 53 Stratix IV FPGA 53 Enea Accelerator Platform 53 TLA# 53 Gigabit PHY 53 Modbus TCP IP 53 PolarPro 53 BCM# integrates 53 I2C interfaces 53 Kontron AT# 53 ARM9 processor 53 CryptoRF 53 ASN Gateway 53 RMI XLR 53 LM#S# [001] 53 BCM# SoC 53 NFP #xx 53 FibreSpy 53 Highly scalable 53 Reflective Memory 53 Agilent #A [001] 53 2GB DDR 53 Stratix IV E 53 IxYukon 53 Actel Fusion 53 FPGA prototyping 53 SiW# 53 F#x [001] 53 MB#R# 53 optionally configured 53 embedded PowerPC 53 SRIO 53 Non Volatile 53 1Mbyte 52 Vx# [002] 52 fpgas 52 Trillium Femtocell 52 CWDM DWDM 52 T1 E1 T3 E3 52 Signaling Gateway 52 CESoP 52 Ethernet Gigabit Ethernet 52 Fusiv 52 programmable FPGA 52 Kbit 52 interprocess communications 52 gigabit Ethernet switches 52 Serial Device 52 serial EEPROMs 52 SFP transceivers 52 PCI Express interface 52 OC-#/STM-# [001] 52 XAVi 52 LatticeECP 52 Gigabit Ethernet PHY 52 CellMath 52 Serdes 52 MediaLB 52 TI C#x 52 1GB PC# 52 Stratix GX 52 OMAP DM# 52 Mixed Signal IC 52 PMICs 52 APIX 52 PHY SerDes 52 iCE# 52 TMS#DM# [001] 52 transceiver IC 52 dsPIC#F# 52 securely transmits 52 DesignWare USB 52 KVM Extender 52 Reference Designs 52 SH 4A 52 WAN PHY 52 iSPAN 52 Pseudowire 52 Seamlessly integrated 52 TILE# processor 52 Freescale ColdFire 52 datapath 52 SoC Encounter 52 AdvancedMCs 52 Databahn 52 search engines NSEs 52 SBC# [003] 52 UDP TCP 52 Gigabit Ethernet Fibre Channel 52 PSoC architecture 52 Platform FPGAs 52 4Gbit s Fibre Channel 52 Xtensa processor 52 IEEE #.#Q 52 ARM#T core 52 #bit RISC 52 MB#K# 52 Megaco 52 Freescale PowerQUICC III 52 #GbE NIC 52 CoreSight 52 #.#g Wireless 52 R8C/Tiny 52 embedded EEPROM 52 RocketIO 52 Cavium OCTEON 52 8bit MCU 52 TMS#C#x 52 LatticeEC 52 Freescale QorIQ P# 52 Serial EEPROM 52 H.# SIP 52 iDigi Platform 52 MPC# processor 52 DSP# [001] 52 Edge QAM 52 Stratix II FPGA 52 serial backplane 52 Atmel CAP 52 TMS#TCI# 52 StarCore DSP 52 photonic switches 52 LDO voltage regulator 52 #.#b wireless LAN 52 INTERACT AT 52 PowerQUICC III 52 DCOSS 51 VoIPerfect 51 LAN# 51 GPON OLT 51 TrueStore 51 CN#XX 51 IronPoint Mobility 51 Sequans SQN# 51 ColdFire ® 51 MusicMagic 51 automatically configures 51 Stateful Packet Inspection 51 Fabric Switches 51 nonvolatile memory NVM 51 Promentum ATCA 51 IPNET 51 Dialogic ® 51 TCP IP Offload Engine 51 scales linearly 51 L2 L7 51 core MIPS# 51 Freescale MPC# 51 #GFC 51 Programmable Logic Devices 51 ARM#EJ processor 51 LSI MegaRAID 51 dynamically allocates 51 SLIMbus 51 SerDes chipset 51 multi homed 51 Storage Adapter 51 port #GBASE T 51 STM# microcontrollers 51 TMS#C#x TM 51 MODBUS TCP 51 wirelessly connects 51 TI TMS#C# 51 Agilent MXA 51 Intel IXP 51 #:# LVDS 51 Altera Cyclone III 51 Hypercom Optimum T# 51 XWAY 51 XMEGA 51 XML eXtensible Markup Language 51 Parlay X 51 IPv4 IPv6 51 SAS expander 51 Atheros WLAN 51 eVC 51 MSP# [002] 51 VCXO 51 dataflow architecture 51 #G DPSK 51 SFN#F 51 serdes 51 VoIP softswitch 51 DDR NAND 51 compiler assembler 51 TI DM# [001] 51 Vitesse FlexEQ 51 Virtual LAN VLAN 51 packet forwarding 51 XIO# 51 Teknovus EPON 51 DDR2 memory interface 51 detachable antenna 51 Synopsys DesignWare USB 51 vNIC 51 H VPLS 51 VPN Router 51 #D/#D graphics engine 51 Stratix IV GX FPGA 51 Cytoscape 51 ARM Cortex M0 51 datapaths 51 IEEE #.#.# compliant 51 Serial FPDP 51 DDR InfiniBand 51 Hyperlinking 51 Fibre Channel Gigabit Ethernet 51 e# cores 51 UMA GAN 51 Renesas Electronics RX 51 PCIe interconnect 51 dsPIC 51 Synplify Premier 51 ARM#T 51 SATA AHCI 51 Mbit densities 51 OCTEON CN#XX 51 level synthesis HLS 51 programmable Ethernet switches 51 ASIC SoC 51 QUALCOMM BREW TM 51 nonvolatile F 51 ASN GW 51 InfiniBand Switch 51 OSEck 51 MIPS# processor 51 ARM#J S 51 QorIQ P# processor 51 serial RapidIO 50 MPLS VPLS 50 AVR microcontroller 50 NXCPUs 50 x8 PCI Express 50 USB# [002] 50 #bit MCUs 50 ARM#E S 50 LDAP Active Directory 50 Intel ® 50 DataDirect XML Converters 50 1GHz Arm 50 ProASIC3 50 RLDRAM II 50 Xilinx FPGA 50 DDR/DDR2 50 Wintegra WinPath 50 picoChip PC# [001] 50 OneNAND TM 50 RSTP 50 kit RDK 50 ARM# [003] 50 DesignWare IP 50 Blackfin ® 50 DDR2 memory controller 50 Cortex M4 50 Follow Vishay 50 Spartan 3AN 50 Resilient Packet Ring RPR 50 SMS Router 50 RISC DSP 50 Virtex 5 50 VideoCore 50 #.#a/g/n 50 LatticeXP2 50 #G/#G/LTE 50 sigma delta 50 SIP Session Initiated Protocol 50 sRIO 50 Kilopass XPM 50 GPON Optical Line 50 LX#T FPGA 50 SAS expanders 50 XLS Processors 50 ZigBee modules 50 #GbE converged 50 OCTEON TM 50 BLADEHarmony Manager 50 Equinix IBX 50 pseudo SRAM 50 datatypes 50 #Gbits s 50 #Kbit [001] 50 LRDIMM 50 SONET EoS 50 Digi ConnectPort 50 dsPIC#F 50 Express Logic NetX 50 CS# [002] 50 TigerSHARC 50 EmberZNet 50 MultiVOIP 50 #.#.#/ZigBee 50 BaseT Ethernet 50 HPLC-Chip/MS 50 ML#Q# 50 TrueScale 50 NetIron 50 VoiceStick ® 50 baseband RF 50 ADSP BF# 50 QUICC Engine technology 50 ATCA blade 50 Mobile eXtreme Convergence 50 LatticeECP2M 50 Cortex processor 50 TriCN 50 Wireless Modems 50 #Kf 50 FPGAs ASICs 50 Limiting Amplifier 50 Ethernet SONET 50 Fast Fourier Transform FFT 50 SONET Ethernet 50 LAIIX 50 LPDDR2 50 MPC#e 50 Mitrion 50 #Gbit/sec 50 #/#/# Mbps Ethernet 50 Zynq 50 #-Gbit/sec 50 C#x DSP 50 multicore DSPs 50 Freescale i.MX# [002] 50 XA# XML Accelerator 50 TI MSP# 50 WinPath3 50 TMS#C#x + DSP 50 4U server 50 linearly scalable 50 wireless LAN chipset 50 Intel PXA#x 50 LatticeECP2 M 50 6Gbps SAS 50 Controller Continuum 50 Tensilica processors 50 AVR ONE 50 SpycerBox 50 MMA#L 50 MSC# [001] 50 IMS SIP 50 i.MX# processors 50 Ember ZigBee 50 coprocessing 50 ARM Cortex A9 processor 50 Matlab Simulink 49 InfoTools 49 4KEc core 49 seamless interworking 49 Snapdragon MDP 49 HCS# 49 DesignWare SATA IP 49 multipoint conferencing 49 ISL#M 49 NetAccess 49 Gigabit Ethernet interfaces 49 GTX transceivers 49 5 SX#T 49 Coarse Wavelength Division Multiplexing 49 CBA# 49 Servlets 49 HTTP FTP 49 OMAP Vox 49 NAT Traversal 49 multiprocessor architecture 49 WAN Gigabit 49 IP softswitch 49 #/#/#BASE-T Gigabit Ethernet 49 AVR XMEGA 49 PurePath 49 picoXcell 49 F#x [002] 49 FastIron Edge X 49 PCIe GbE 49 Arria GX 49 OpenRG 49 VPN gateway 49 Flash MCU 49 CEVA Teak 49 PowerTerm ® 49 Zarlink ZL# 49 megabit Mb 49 RISC processor 49 ARM#EJ S TM 49 PCIe Gen2 49 VPN router 49 Serial RapidIO ® 49 NexTone IntelliConnect System 49 Intel IXP#XX 49 Freescale i.MX 49 QT# [002] 49 Gigabit ethernet 49 MorethanIP 49 Cavium Octeon 49 Controller Hub 49 ReachNXT 49 Gigabit Ethernet GigE 49 cRIO 49 synthesizable IP 49 TI OMAP# [002] 49 AR#AP 49 ROAMpay 49 AMBA AXI 49 RISC cores 49 #.#GB s [001] 49 multicore DSP 49 MIPS# ® 49 synthesizable 49 Extensibility 49 Freescale MSC# 49 Qorivva 49 AMD Geode ™ 49 AVR# [002] 49 Gigabyte X#A 49 QorIQ 49 ARM AMBA 49 ST Nomadik 49 low latency InfiniBand 49 MIPS# cores 49 Atmel ATmega#RFA# 49 MPC#E processor 49 Synchronous Optical Network 49 SoIP 49 Freescale PowerPC 49 TN# [002] 49 StarFabric 49 8MB L3 cache 49 AMBA ® 49 GbE switches 49 AVRCP profiles 49 switchless 49 XLR# 49 PCI Express Gen2 49 AdvancedTCA blades 49 Nanoelectronic 49 VxWorks RTOS 49 core MIPS# processors 49 CAN transceiver 49 wavetable 49 Virtual HBA 49 Ethernet PHY 49 SIP SS7 49 chip SoCs 49 Ripcord2 49 MIPS processor 49 SystemWeaver 49 Arria GX FPGAs 49 VeriSilicon ZSP 49 SocketModem 49 HomeSend 49 Solarflare #GbE 49 Softswitches 49 Spartan 3E 49 Cavium ECONA 49 AdvancedMC modules 49 reconfigurable transceiver 49 coupled inductor 49 FPGA fabric 49 Carrier ENUM 49 audio CODEC 49 eSi RISC 49 AMCC PowerPC 49 S#X [002] 49 bisulfite sequencing 49 PacketPro 49 CY#C#xxx 49 6G SAS 49 ARM CoreSight 49 dual gigabit Ethernet 49 hyper threading technology 49 VPN tunneling 49 TSMC Collaborate 49 2Gb s 49 Stratix II GX FPGA 49 Carbon SoC Designer 49 reconfigurable logic 49 AMD Geode TM 49 LVDS interface 49 CAN transceivers 49 CN# [002] 49 interface 49 #G OTN [001] 49 programmable clocks 49 TigerAccess 49 G.PAK 49 CompactPCI ® 49 AdvancedMC TM 49 logic elements LEs 49 #.#GHz transceiver 49 units ONUs 49 tunable RF 49 DDR Memory 49 LinuxLink subscriptions 49 #G/#G [001] 49 shared L3 cache 49 Zhone MALC 49 ARM Cortex M3 microcontroller 49 SPI#.# 49 #/#Base-T 49 ® XScale 49 UCD# 49 EdgeMarc Network Services 49 Packetry II 48 OMAP Vox TM 48 customizable dataplane processors 48 Ubigate 48 LPDDR 48 H8S 48 FXT FPGAs 48 C#F# [001] 48 transceiver modules 48 Ethernet WAN 48 DM#x [001] 48 SONET rings 48 Mitrion C 48 W3C XML Schema 48 Panasas storage 48 ARM7 ARM9 48 DPN ® 48 laser diode drivers 48 J2ME TM 48 TMS#C# DSPs 48 LAN PHY 48 Broadcom BCM# [002] 48 TRF# [002] 48 MIPS# 4KE 48 multithread 48 #Gigabit 48 2GB DDR3 memory 48 IntelliConnect System 48 ComboBox 48 #GbE controller 48 Xilinx Virtex 5 48 ARM#EJ 48 MP# processor 48 Universal Adapter 48 dataplane 48 PCIe PHY 48 5 FXT FPGA 48 DAN# 48 RS# serial ports 48 SHARC #x 48 MegaCore 48 Intel IOP# 48 simultaneous TCP UDP 48 Wireless MAXg 48 #nm Virtex 48 Stratix III FPGA 48 SS7 signaling 48 Juniper SRX 48 PXA3xx 48 MicroBlaze processor 48 TMS#C# 48 ProASIC3 E 48 Adaptec Unified 48 fast Fourier transforms 48 iSCSI HBA functionality 48 FBDIMM 48 TDA# [001] 48 Phenotyping 48 GbE controller 48 PathScale InfiniPath 48 ATmega#P [001] 48 Stratix IV GT 48 Application Layer 48 Myri #G 48 IOP# 48 NETL7 48 XRT#L# 48 GbE interfaces 48 MIPS# processors 48 Compact FieldPoint 48 USB PHY 48 8Gbps Fibre Channel 48 AdvancedTCA ATCA 48 Netgear ProSafe 48 bidirectional communication 48 ISDN PRI 48 WiLink 48 #GbE switch 48 #GE ports 48 Mediant 48 LatticeXP 48 SPD EEPROM 48 VIA VX# MSP 48 Ethernet PHYs 48 LatticeSC 48 Brekeke PBX 48 HomePlug powerline 48 IronPoint 48 Pandora Rhapsody 48 Debug Solution 48 MCP#X 48 Aepona Causeway 48 ARM#EJ S 48 PressureWire Aeris 48 InfiniBand QDR 48 HOTLink II 48 ATCA AMC 48 ColdFire processors 48 QDR SRAM 48 #G CFP 48 AdvancedTCA AdvancedMC 48 SIP H# 48 SATA disk arrays 48 WNHDE# 48 HyperText Transfer Protocol 48 Vitesse Carrier Ethernet 48 Anagran FR 48 SmartEdge platform 48 fully synthesizable 48 multidomain 48 #Gbs 48 TI C# 48 eNodeBs 48 supports Bluetooth A2DP 48 ISDN BRI 48 FPGA architectures 48 EEPROMs 48 InfiniBand adapter 48 RGMII 48 C#x + 48 P# processor 48 Tatara Convergence Server 48 WiFi Hot Spots 48 ARM7TDMI core 48 6Gb s SAS SATA 48 OnTour ® 48 StreamEngine 48 OCTEON processors 48 SiT# 48 Stateful Packet Inspection SPI 48 Denali Databahn 48 StrataXGS III 48 SM# AH 48 Smart Switches 48 #/#/#Base-T 48 WiFi #.#b g 48 ControlSwitch 48 AT#SAM# [001] 48 SSH SFTP 48 TI OMAP#x 48 STM8 48 SonicsMX 48 twinax 48 Voltaire InfiniBand 48 Broadcom BCM# [001] 48 #Gb s Fibre Channel 48 Marvell PXA 48 seamless integrations 48 RMI XLR Processor 48 OMAP#x processors 48 trunking gateway 48 Ulticom Signalware 47 multiplexed assay 47 User Datagram Protocol 47 multi threaded multiprocessor 47 HiGig 47 ParcelStream ™ 47 NPUs 47 Xtensa LX2 47 DM#E 47 Luminary Micro Stellaris 47 SCIM 47 Marvell #W# 47 supramolecular assembly 47 SGMII 47 MCF# 47 #.#a/b/g/n Wi Fi 47 asymmetric multiprocessing 47 WAVE# 47 VDSL2 ADSL2 + 47 Broadcom Completes Acquisition 47 Stratix II FPGAs 47 TI TMS#C#x + 47 Drop Multiplexer ROADM 47 secureAVR 47 PCIe Gen 2 47 VOIP TDM E1 47 firewall NAT 47 Blackfin processors 47 IP VPN MPLS 47 RADIUS authentication 47 CXF 47 #G PHY 47 JavaScript DOM 47 MIPS CPU 47 AVR# UC3 47 access devices IADs 47 Jungo OpenRG 47 PanelPort 47 4GB DDR3 47 Stratix II GX 47 iSCSI RDMA 47 COBOL CICS 47 dual stack IPv#/IPv# 47 heterogeneous multicore 47 accelerometer gyroscope 47 ASIC prototyping 47 ARM Cortex processor 47 Gbps InfiniBand 47 OC# [003] 47 bit RISC CPU 47 CommandCenter Secure Gateway 47 Alcatel OmniPCX 47 Location Aggregation 47 MicroTCA platforms 47 CorEdge Networks 47 Stream Processor 47 3G/GSM 47 KSZ# 47 Multilayer Director 47 MIPS# #K core 47 circuit MMIC 47 convergent billing solution 47 Acme Packet SBC 47 TDM VoIP 47 NET SatisFAXtion 47 LatticeECP2 47 Serial RapidIO Gen2 47 homologous sequences 47 Entity Relationship 47 GigaStorATX 47 #nm Virtex 5 47 fragment shaders 47 SC#T 47 CX#X 47 core multi threaded 47 Atmel picoPower 47 GbE controllers 47 CompanionLink synchronizes 47 Gbps transceivers 47 COTS FPGA 47 Windows.Forms 47 AudioCodes Mediant 47 Synopsys DesignWare 47 SS7 ISDN 47 OCTEON II 47 CEVA X 47 LSI SAS# 47 federates 47 multiple SSIDs 47 Nortel Optical Multiservice 47 StrataXGS 47 SiliconBlue 47 LC connectors 47 TMS#C# ™ 47 OMAP TM 47 visit www.idt.com 47 ADSL2 + modem router 47 reconfigurable optical 47 fiber optic transceivers 47 MachXO2 47 coherent HyperTransport 47 IMAP POP3 47 PowerQUICC processors 47 SS#/C# 47 Mali# [002] 47 Altera Stratix 47 HardCopy ASIC 47 light scattering DLS 47 MirrorBit ORNAND 47 PCIe interface 47 AEC Q# qualified 47 kinase assay 47 MSP# MCU 47 DM#x [002] 47 DesignWare Verification IP 47 JavaBean 47 Tsi#A 47 Relevancy Engine platform 47 Ethernet LAN 47 Label Switching 47 Nios II 47 GbE PHY 47 #Gbit Ethernet 47 PSRAM 47 ATCA MicroTCA 47 Z1 SecureMail Gateway 47 Cortex R4 47 OCTEON Plus 47 Signal Conditioning 47 MetroMesh 47 Astaro Mail 47 FastIron SuperX 47 www.callwave.com 47 MPC# [002] 47 ORNAND 47 ASPX 47 #MIPS [002] 47 IEnumerable 47 Serial RapidIO IP 47 Cortex R5 47 MPC#E 47 LambdaUnite 47 RLDRAM 47 SIP Registrar 47 ExpressLane 47 ARM9 ™ 47 OFDM modulation 47 Deterministic 47 QorIQ P# 47 websites intranets 47 Object Relational Mapping 47 eSi 47 VidyoRouter 47 Veraz ControlSwitch 47 IDT PCIe 47 Ember EM# 47 VoIP Gateways 47 STM8L 47 Gigabit Ethernet adapters 47 stateful inspection firewall 47 Cadence Virtuoso IC 46 SparkEngine 46 Optimizer TM 46 #Base FX 46 MIPS cores 46 TreeView 46 acquiring Followap Inc. 46 nCite 46 5 LXT 46 network adapters CNAs 46 Stratix III FPGAs 46 PCI Express Gigabit Ethernet 46 MGCP 46 Metamaterial 46 Nucleation 46 Cavium Networks OCTEON 46 PoE Switch 46 PRC# 46 Freescale PowerQUICC 46 MegaRAID SAS 46 FortiGate appliance 46 Logical Volume Manager 46 #K#R 46 NexTone SBC 46 Getac PS# 46 Internet Protocol Multiprotocol 46 P CSCF 46 #.#aq 46 VME CompactPCI 46 NLP# [001] 46 CNS3XXX 46 interprocess communication