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(Click for frequent words.) 69 hierarchy SDH 64 inverse multiplexing 61 NexTone SBC 61 SONET Ethernet 61 TDM ATM 61 WAN PHY 60 #G/#G/#G 60 SPI serial 60 Wavelength Tracker 60 SDH SONET 59 QAM quadrature amplitude modulation 59 packetization 59 CWDM DWDM 59 TCP Acceleration 59 fieldbus protocols 59 MODBUS RTU 59 MEF certified 58 seamless interworking 58 #G coherent [001] 58 synchronous asynchronous 58 optical DWDM 58 ADSL VDSL 58 SFP transceivers 58 infrared IrDA 58 E1 T1 58 dual stack IPv#/IPv# 58 OTN switching 58 downlink uplink 58 Serializer Deserializer SerDes 57 ActivFlex 57 Gigabit PON GPON 57 bursty traffic 57 switchmode 57 protocol multimedia subsystem 57 Telkonet develops 57 LVTTL 57 ISDN PRI 57 GuideBuilder 57 mux demux 57 Allot NetEnforcer 57 Wavelength Division Multiplexing 57 synchronous optical 57 Wavelength Division Multiplexing WDM 57 GE PON 57 USART 57 Tatara Convergence Server 57 SS7 ISDN 57 OC-#/STM-# [004] 57 WPANs 57 division duplex TDD 57 quadrature amplitude modulation 57 CS# EDC 57 #G/#G/LTE 57 #.#Tbps [002] 57 Gbps optical 57 Integrated Receiver Decoders 56 uses HSDPA UMTS 56 linecards 56 loopbacks 56 #Gigabit Ethernet 56 metro DWDM 56 stateful failover 56 EN# MPEG 4 56 GENBAND G9 56 DWDM optical 56 Gbps DWDM 56 optical wavelength 56 SDH PDH 56 Ethernet WDM 56 DWDM backbone 56 dense wavelength division multiplexing 56 polar modulation 56 EtherSphere 56 Synchronous Digital Hierarchy SDH 56 sub channelization 56 #.#G 3G 56 E1 circuits 56 #.#Gb s [002] 56 modular CMTS 56 Ethernet interfaces 56 T1 E1 56 ESCON FICON 56 fasp ™ 56 3G/HSPA + 56 ATSC DVB T 56 backhaul aggregation 56 SDH DWDM 56 SONET SDH Ethernet 56 Synchronous Digital Hierarchy 56 NexTone IntelliConnect System 56 #/#.#G 56 OFDM orthogonal frequency 56 RTSP RTP 56 DS#/E# 56 Ethernet MACs 56 selects Alcatel Lucent 55 IP Multicast 55 spectrally efficient 55 Ethernet-over-SONET/SDH 55 demodulate 55 LAN PHY 55 POTS interfaces 55 Ethernet SONET 55 multipoint Ethernet 55 CWDM SFP 55 GSM GPRS EGPRS 55 SONET SDH optical 55 IP SAS SATA 55 IMS SIP 55 BigBand BMR 55 ADSL2 + VDSL 55 #Gbit s Ethernet [002] 55 division duplex FDD 55 MSC Servers 55 DS1 DS3 55 IPv6 multicast 55 modulation formats 55 CESoP 55 Selects Ciena 55 ISDN DSL 55 coarse wavelength division multiplexing 55 #G OTN [001] 55 GPON EPON 55 #G DWDM [001] 55 1G Ethernet 55 MPLS Multiprotocol Label Switching 55 Super PDH 55 OADMs 55 TDM telephony 55 protocol Label Switching 55 #G DP QPSK 55 FSP #RE 55 synchronous buck controller 55 unicast streaming 55 #GbE interfaces 55 AFEs 55 tunable DWDM 55 voiceband 55 uplink downlink 55 M CMTS 55 SONET rings 55 SIP H# 55 HD SDI SD SDI 55 Label Switching IP MPLS 55 #/#BaseT 55 STM-#/OC-# 55 ASN GW 55 Fibre Channel FICON 55 EDGE WCDMA 55 packetized 55 Ethernet MPLS 55 LVDS output 55 trunking gateway 55 selects Alcatel 55 AFBR 55 MediaLB 55 Passive Optical Networking 55 Teknovus EPON 55 #nm wavelength [002] 55 1G EPON 55 LambdaUnite R 55 packetized voice 55 tunable filters 55 E#/T# ports 55 DPSK 55 Ethernet aggregation 55 AdaptRate 55 Ethernet SONET SDH 55 GSM TD SCDMA 55 #G optical [001] 54 #Mbyte s [001] 54 multiplexer demultiplexer 54 IPv4 IPv6 54 femtocells picocells 54 MPLS VPLS 54 DS1s 54 PT Comunicações 54 channel bandwidths 54 transceiver modules 54 IP softswitches 54 SS7 ATM 54 jitter attenuation 54 #Gbps optical [002] 54 IMS architectures 54 NGN IMS 54 VDSL2 bonding 54 Serdes 54 TDM interfaces 54 QT# [002] 54 Multiplexers 54 ModBus 54 Tunable lasers 54 ADSL2Plus 54 photonic components 54 UMTS HSPA + 54 OC-#/STM-# [001] 54 Drop Multiplexer ROADM 54 DVB S2 satellite 54 4Gbit s Fibre Channel 54 DWDM wavelengths 54 Qspeed diodes 54 WDM wavelength division multiplexing 54 PSTN ISDN 54 Packet ONP 54 Ethernet IP MPLS 54 pluggable module 54 multichassis 54 TDMA GSM 54 PDH SDH 54 Quadrature Phase Shift Keying 54 GSM backhaul 54 units ONUs 54 datacomms 54 LAN SAN 54 serdes 54 photonic layer 54 #G wavelengths [001] 54 Passive Optical Networks 54 Wave Division Multiplexing 54 M3UA 54 FTTx networks 54 IP MPLS VPN 54 Universal Edge Routers 54 dynamically reconfigure 54 multistandard 54 Actelis carrier 54 MPLS backbone 54 VoDSL 54 iNFINITI 54 Circuit Emulation 54 multimode fibers 54 CWDM wavelengths 54 IP MPLS backbone 54 transcoders 54 SS7 signaling 54 Gb s optical 54 demodulating 54 Gigabit Ethernet Fibre Channel 54 XFP modules 54 quadrature phase 54 Gbps interfaces 54 #Gb s optical 54 orthogonal frequency division 54 UMTS W CDMA 54 Raman amplification 54 multiservice switches 54 OFDM modulation 54 DWDM CWDM 54 reconfigurable transceiver 54 Multiservice Provisioning Platform MSPP 54 IMS TISPAN 54 CST MWS 54 quadrature amplitude modulation QAM 54 asynchronous transfer 54 PCIe GbE 54 CoreStream Agility 54 converged packet 54 H VPLS 54 IP multicast 54 Sigtran 54 Modbus RTU protocol 54 repeatered 54 locked loops PLLs 54 I2C interfaces 54 #x#G [002] 54 Adaptive Optical Engine 54 haul DWDM 54 Switch Routers 54 DVB-S/S2 54 SONET EoS 54 omnidirectional antennas 54 Ethernet TCP IP 54 synchronous serial 53 packet forwarding 53 Raman amplifiers 53 8PSK 53 Profinet IO 53 multirate 53 DS0 53 optical splitters 53 wavelength division multiplexing 53 synchronous Ethernet 53 RSTP 53 domain reflectometer OTDR 53 SFP modules 53 DDR SDRAMs 53 Ethernet LANs 53 RS-#/# 53 DP QPSK 53 failover failback 53 Switching GMPLS 53 downlinked via 53 cdma# 53 dual polarization quadrature 53 L4 L7 53 trunking gateways 53 Label Switching 53 #GBASE LR4 [001] 53 modulated RF 53 GPIB interface 53 MIPI interface 53 ISDN BRI 53 VoATM 53 VoCable 53 ONUs 53 PRI ISDN 53 Fibre Channel Gigabit Ethernet 53 IP multicasting 53 synchronous 53 IPv#/IPv# 53 switching matrices 53 micro pico 53 ADSL ADSL2 + 53 ASON 53 LightSoft 53 VCSEL driver 53 #GFC 53 Internet Protocol Multiprotocol 53 Wideband Networking Waveform 53 EoPDH 53 CDMA TDMA GSM 53 Selects VocalTec 53 ADSL/ADSL2 + 53 LAN WLAN 53 lightpaths 53 ATM asynchronous 53 TI TNETV# 53 #Gbps wavelengths 53 1x RTT 53 4G/LTE wireless 53 RS# serial 53 Coarse Wavelength Division Multiplexing 53 MACsec 53 Virtual Concatenation 53 Gbps wavelength 53 PacketCable compliant 53 Rapid Spanning Tree 53 datarates 53 GPRS UMTS 53 Gbit s optical 53 1G #.#G 53 Fiber Bragg Grating 53 Pseudowires 53 T#/E# interfaces 53 GZIP compression 53 #APSK 53 #Gbs 53 IP MPLS routers 53 seamlessly interoperates 53 Mach Zehnder 53 Packet Core 53 muxponder 53 fiber uplinks 53 MSPPs 53 IEEE #.#.# compliant 53 #.#/#G 53 Resilient Packet Ring RPR 53 EtherNet IP connectivity 53 mesh topology 53 CoMP 53 VarioTAP 53 tunable transponder 53 #Gb s Fibre Channel 53 Flexi Base Stations 53 optical spectrum analyzers 53 Xtensa processor 53 UMA GAN 53 #Gbps serial 53 Hybrid Fiber Coaxial 53 NexTone MSC 53 Amdocs Cramer 53 SC FDMA 53 LANs WANs 53 aggregation switches 53 SS#/C# 53 Nortel Networks OPTera Metro 53 TCP acceleration 53 Shift Keying 53 UDP TCP 53 GPON Gigabit 53 #/#BASE-T 53 3Gbit s 53 RS# interfaces 53 Encryptors 53 Motorola AXS# 53 multipoint conferencing 53 mux 53 Differential Quadrature Phase 53 GSM GPRS modem 53 TDM SONET 53 Hybrid Fiber Coax 52 #/#/# Ethernet 52 ADSL2 + modems 52 multicast routing 52 MF TDMA 52 #G/#G optical 52 1Gbit/sec 52 I2C compatible interface 52 modulation PWM 52 SONET ATM 52 STA# [001] 52 sensor actuator 52 RIP OSPF 52 WDM ROADM 52 Virtual LAN VLAN 52 THz frequencies 52 asynchronous mirroring 52 transceiver IC 52 transrating 52 RF amplifier 52 Grandmaster Clock 52 8Gbit s FC 52 #.# MHz [002] 52 Core Routers 52 Nortel OME 52 WCDMA HSPA + 52 node segmentation 52 baseband MAC 52 DWDM transport 52 Sat3Play 52 delta sigma 52 G.# GPON 52 VolP 52 packet switched 52 IntelliConnect System 52 Gbps wavelengths 52 #Gbit [002] 52 Infinera DTN optical 52 #BASE 52 NEBS certified 52 #Gbps optical [001] 52 Gigabit PON 52 serializer deserializer SERDES 52 wireless LAN WAN 52 IPv#/IPv# routing 52 IPStar 52 #Base SX 52 RS#/RS# 52 SMS Router 52 deterministic Ethernet 52 steerable beams 52 fiber optic transceivers 52 #G DQPSK 52 Ethernet Gigabit Ethernet 52 iDirect Evolution platform 52 intersystem 52 AN #i broadband 52 W CDMA HSDPA 52 Iub 52 #Base T [002] 52 Packet Optical Platform 52 fieldbuses 52 E NNI 52 GSM WCDMA HSPA 52 DVB ASI 52 Packet Optical 52 tunable transmitter 52 MPEG4 compression 52 PWM pulse width modulation 52 #Base T Ethernet 52 Access Devices EADs 52 multimode fiber optic 52 SDH Synchronous Digital Hierarchy 52 sRIO 52 multiservice aggregation 52 sub #ms 52 GSM GPRS cellular 52 ISDN ADSL 52 peripheral DMA 52 GSM EDGE W CDMA 52 Service Node OMSN 52 multi terabit 52 DWDM dense wavelength 52 Intellon HomePlug ICs 52 asynchronous synchronous 52 #GHz bandwidth 52 MODBUS 52 Wireless WAN HWIC 52 OADM 52 GPRS EDGE UMTS 52 linear amplifiers 52 LTE basestation 52 DynaMate 52 microstrip 52 Ethernet Demarcation 52 asynchronous serial 52 converged IP MPLS 52 MCS# 52 gigabits sec 52 SkyRouter 52 #v# [004] 52 I2C serial 52 PSTN connectivity 52 fasp 52 SDH Sonet 52 interprocessor communications 52 signaling interworking 52 GSM UMTS CDMA 52 Multiservice Edge 52 GigE interfaces 52 serializer deserializer SerDes 52 Service Aggregation Router 52 pluggable modules 52 #G optical [002] 52 BGAN satellite 52 dc dc controller 52 CEVA X# 52 UMTS LTE 52 fiber SMF 52 DTH IPTV 52 #Base T [003] 52 GPON OLT 52 wideband tuner 52 DigRF v3 52 OLTs 52 W CDMA networks 52 #GBase T PHY 52 RDP VNC 52 SONET SDH networks 52 Covergence Session Manager 52 Synchronous Optical Network 52 Electronic Dispersion Compensation 52 dynamically allocating 52 LAN Ethernet 52 #Gbit/sec 52 MegaCore 52 3Gb s HD SDI 52 AdvancedMCs 52 ADCs DACs 52 pluggable optics 52 Add Drop Multiplexers 52 InfiniBand fabrics 52 SFP ports 52 XFP transceivers 52 CMOS RF transceiver 51 eNB 51 Versant Object Database 51 Protocol IP 51 GMSK 51 servo controller 51 DQPSK 51 PSTN gateway 51 #/#G [002] 51 #-Gbit/sec 51 IP FCIP 51 Altera HardCopy 51 SprintLink 51 AMN# [002] 51 Netledge 51 Flexi NS 51 Base Transceiver Station 51 Le# [002] 51 GSM GPRS Edge 51 pseudowires 51 #.#a/g/n 51 RF transistors 51 Bonded T1 51 EDFAs 51 Network IP NGN 51 SIP MGCP 51 division multiplexing TDM 51 L2 L7 51 datacommunications 51 #BASE T [001] 51 pseudo SRAM 51 T1 DSL 51 transmits signals 51 1G 2G 51 #Mbits s [001] 51 3G UMTS networks 51 SRIO 51 EtherSAM 51 #.#Tbps [001] 51 SGSN 51 Mbps symmetric 51 UTRAN 51 VOIP TDM E1 51 fiber coax HFC 51 Gigabit Ethernet SFP + 51 output MIMO 51 TDM PSTN 51 Universal Asynchronous Receiver 51 Ethernet interworking 51 AirVantage Platform 51 video recorder NVR 51 GPIB interfaces 51 PSTN interconnection 51 NetIron MLX Series 51 adaptive modulation 51 Network i2i 51 Hitachi Com 51 RocketIO TM 51 low latency InfiniBand 51 SDIO SPI 51 linearly scalable 51 WXC platforms 51 XTAR EUR 51 #kHz frequency [001] 51 hosted NAT traversal 51 #/#BaseT Ethernet 51 1Gb s 51 E#/T# 51 Synopsys Design Compiler 51 #G/#G [003] 51 VPN router 51 MXK platform 51 PT SEGway 51 SyncE 51 SMLT 51 #G wavelength [002] 51 Gbits sec 51 fanout 51 #G XFP 51 W-CDMA/HSPA 51 FTTH FTTB 51 IntelsatONE 51 MediaMelon 51 Modbus TCP IP 51 GSM UMTS HSPA 51 PBB PBB TE 51 Integrated Trunking 51 IEEE#.#b 51 IPSec tunnels 51 GPRS WCDMA 51 Cellular Backhaul 51 packet backhaul 51 Ethernet Extenders 51 HD SDI SDI 51 multihop 51 DVB S2 modulation 51 Muxponder 51 Zarlink VE# 51 G.# G.# 51 DO Rev 51 Tekelec EAGLE 5 51 OC# [003] 51 coax cables 51 RF microwave components 51 wireless basestation 51 local oscillator LO 51 XAUI interface 51 W CDMA HSPA 51 multiservice switching 51 polarization multiplexed 51 PowerTerm ® 51 transceiver chipset 51 Umbilical connectors provide 51 femtocell gateways 51 DiSEqC 51 Spanning Tree Protocol 51 #G GPON 51 DSLAM backhaul 51 IP VPN MPLS 51 Gigabit Ethernet uplinks 51 8G FC 51 Glimmerglass optical 51 RS#/# 51 converged multiservice 51 jitter clocks 51 IPoDWDM 51 DTG# 51 OC-#/STM-# [002] 51 multimode optical fiber 51 PMBus interface 51 AdvancedTCA blades 51 modem chipsets 51 #Gb s [002] 51 Evolium 51 femtocell gateway 51 Calix C7 Multiservice Access 51 HYDRAstor HS8 51 WLAN #.#n 51 T1 T3 51 #Gbit s [002] 51 demultiplexing 51 ME WE 51 T1 DS3 51 ASN gateway 51 Vsat 51 V.# fax 51 L#/L# 51 FDD TDD 51 Dual Polarization Quadrature Phase 51 TCP optimization 51 Ixia IxNetwork 51 #GHz #GHz 51 ZSN 51 DAS SAN 51 CAMEL roaming 51 protocol analyzers 51 burstable 51 protocol interworking 51 LDO voltage regulator 51 SCPS TP 51 iWDM 51 User Datagram Protocol 51 MVTS Pro 51 digital headend 51 IGMP snooping 51 GSM CDMA 3G 51 lightwave 51 M7i 51 optionally configured 51 W CDMA 3G 51 pseudowire 51 Modbus ASCII 51 QPSK 51 SIGTRAN 51 RJ# ports 51 asymmetric multiprocessing 51 SHDSL 51 IEEE#.#b g 51 MTP2 51 HomePlug powerline 51 #/#Mbps Ethernet 51 SFP + transceivers 51 strand mounted BelAir#S 51 reconfigurable optical 51 multicast streams 51 XFP optics 51 IPTV STB 51 uplink ports 51 UMTS GPRS 51 SmartEdge platform 51 EMTAs 51 Link Aggregation 51 Downlink 51 IEEE #.#aq 51 networkability 51 cable MSO 51 IP MPLS Ethernet 51 KVM extenders 51 Label Switching MPLS 51 XPIC 51 Completes Interoperability Testing 51 euTrade 51 #G wavelength [001] 51 RTD Tango 51 #GBASE 51 3G/GSM 50 POTS ISDN 50 softswitch architecture 50 Castify 50 RF ICs 50 multistream 50 #G/#G wireless 50 Add Drop Multiplexer 50 narrow linewidth 50 multipoint video conferencing 50 PMICs 50 Skystar #E 50 crosspoints 50 Edge Routers 50 fast Fourier transform 50 8G Fibre Channel 50 convergent billing solution 50 Dense Wave Division Multiplexing 50 OC-#/STM-# [003] 50 femto cells 50 PIN diode 50 RS-#/RS-# 50 crosspoint switch 50 GFP VCAT 50 Avistar C3 Communicator 50 AES3 50 Dynamic PSK 50 SDIO interface 50 Multi Protocol Label 50 LightGAIN 50 IMS VCC 50 PrPMC 50 Ciena #G 50 NEC Univerge 50 mobile WiMax #.#e 50 #.#GHz [001] 50 Belgacom ICS 50 ENUM registry 50 dynamically allocates 50 arbitrary waveform generators 50 transmitters receivers 50 frequency pulse width 50 T#XR 50 CPE gateways 50 multitechnology 50 demodulated 50 termination resistor 50 Packet Transport 50 HD H.# 50 #/#G [003] 50 Hi FOCuS TM 50 ATCA blades 50 sigma delta 50 unicast multicast 50 #.#af compliant 50 MPLS Multi 50 QAM modulation 50 ADC DAC 50 ITXC.net 50 SKY PerfecTV 50 T#/E# T#/E# 50 DS3s 50 triplexer 50 sigma delta ADC 50 Comverse MMSC 50 CAN transceivers 50 MBd 50 circuit emulation 50 intelligent rack PDUs 50 H.# HD 50 MSV patented 50 stateless offload 50 FPGAs ASICs 50 adaptive beamforming 50 5MHz bandwidth 50 overtemperature protection 50 HP Auto MDIX 50 DWDM Dense Wavelength Division 50 Foundry ServerIron 50 Agilent EXA 50 Pseudowire 50 4Gbit/sec 50 adaptive equalization 50 SIP endpoints 50 MSAPs 50 datagrams 50 4Mbit 50 ULH network 50 #/#/#/# [001] 50 TTL compatible 50 SMW4 50 #.#G GPRS 50 Octasic Vocallo MGW 50 Trillium Femtocell 50 terrestrial transmitters 50 Gigabit Ethernet WAN 50 wideband RF 50 Protocol Analyzers 50 fieldbus interfaces 50 exchange carriers IXCs 50 SERCOS III 50 deterministic latency 50 Optic fiber 50 NTT DOCOMO FOMA 50 wavelength tunability 50 GPRS GSM 50 MEGACO 50 CMTSs 50 IPBX 50 Modulation ACM 50 CDMA 1xRTT 50 converged IP telephony 50 #Gb Ethernet [002] 50 eHRPD 50 multiplexers 50 HN# Series 50 LambdaUnite MSS 50 IWLAN 50 #.#-#.# GHz [004] 50 PSTN PLMN 50 iSCSI RDMA 50 1Gb Ethernet 50 NetLightning 50 wireless basestations 50 PCI cPCI 50 clustering interconnects 50 FastIron Edge X 50 #.#Gbit s [001] 50 xPON 50 Nimbra platform 50 SDH 50 #.#e compliant 50 supplemental downlink 50 Leased Line 50 SkyCross antennas 50 IPSec encryption 50 frequency synthesizers 50 OFDM Orthogonal Frequency 50 failovers 50 1X EVDO 50 ASTRA 2B 50 CSU DSU 50 IEEE #.#af compliant 50 serial RS# 50 serverless backup 50 Digital ROADM 50 HSTL 50 legacy multimode fiber 50 FTTH FTTP 50 dynamically reconfigurable 50 frequency dividers 50 BCM# SoC 50 MobileVoIP 50 Quadrature Amplitude Modulation QAM 50 Highly scalable 50 transimpedance amplifier 50 PHY layer 50 unshielded twisted pair 50 Interactivity Suite 50 OS# DSL 50 Variable Bit Rate 50 BPSK 50 GPRS #.#G 50 TPSDA 50 CoreDirector 50 ROADM functionality 50 #gbps 50 FlexPath 50 Harmonic DiviCom 50 FPGA architectures 50 JESD#A 50 CAN transceiver 50 optical multiplexer 50 AON Superblade 50 symmetric DSL 50 MTM# 50 resonant cavity 50 Profibus DeviceNet 50 Proximetry AirSync 50 Verizon IP Trunking 50 MPLS VPNs 50 DDR2 SDRAM memory 50 Vmux 50 HSxPA 50 #nm LL 50 ADN# 50 UMTS/3G 50 hybrid STBs 50 wavetable 50 Velocix Metro 50 multiservice provisioning platforms 50 Digivance 50 2Gb s 50 SkyEdge broadband 50 #MHz bandwidth 50 Apprion delivers 50 ADSL2 + VDSL2 50 #.#ag 50 Simulink models 50 waveform generator 50 gigabit serial 50 Gbps InfiniBand 50 IPv#/IPv# dual stack 50 #Gb Fibre Channel 50 gigabit Ethernet switches 50 MetroNID 50 CAT 5e 50 MDIO 50 TDM circuits 50 PMBus ™ 50 interprocessor communication 50 HBAs switches 50 Sercos III 50 Arbitrary Waveform Generator 50 Cat 6a 50 #Gbits s 50 StreamScope eRM 50 OC #c 50 IEEE #.#x [002] 50 #.#j 50 ISUP 50 HF VHF 50 RRHs 50 optical transceiver module 50 Hierarchical Storage Management 50 subnet roaming 50 unrepeatered 50 IPTV VoD 50 datarate 50 TDM Ethernet 50 #bit PCI 50 unicast 50 gigabit Ethernet #GbE 50 Flexi NG 50 based terrestrial restoral 50 limitless scalability 50 VoIP Gateways 50 IP backbones 50 AES EBU audio 50 DOCSIS EuroDOCSIS 50 MPLS routers 50 2Gbit s 50 Pseudo Wire 50 EtherReach 50 VSANs 49 GbE Gigabit Ethernet 49 Wi max 49 #Gigabit 49 HSDPA EDGE 49 ADSL SDSL 49 #BaseT [003] 49 CMOS TTL 49 subsea fiber optic 49 drop multiplexer 49 SMS USSD 49 Link OAM 49 Centrex IP 49 Time Division Multiplexing 49 TTL CMOS 49 Protocol Label Switching