Copyright : Valiant Communications Limited Slide 1 VCL-EC TM E1 Echo Canceller (Upto 10 Echo Canceller per Chassis) V aliant C ommunications L imited Telecom Transmission Solutions Updated : March, 2007 U.K. Valiant Communications (UK) Ltd 1, Acton Hill Mews, Uxbridge Road, London W3 9QN, United Kingdom Website: INDIA Valiant Communications Limited 71/1, Shivaji Marg, New Delhi , India Phone: , Fax: , Website: U.S.A. Valcomm Technologies Inc Ponce de Leon, Suite 470 Coral Gables, FL United States of America Website:

Copyright : Valiant Communications Limited Slide 2 Product Overview Robust and cost effective T1 and E1 Echo Canceller and voice quality enhancement solutions for the long distance, wireline, wireless, (GSM, CDMA), VoIP, satellite and radio communications The VCL-EC, E1 echo canceller are offered to provide cancellation of 64ms/128ms (user selectable) echo tails The Echo Canceller equipment is compliant to ITU-T G.164, G.165, G.168 (2000/2002) requirements for echo cancellation The Echo Canceller solutions offers carrier-grade voice quality per AT&T Voice Quality Assessment Lab The Echo Canceller is equipped to offer redundant power supply (optional) The equipment offers RS232 serial interface for configuration through a PC COM Port, and an Ethernet (10BaseT) interface for remote LAN configuration and monitoring which allows the user to monitor and configure the equipment over a TCP-IP network from anywhere in the world E1 Voice Echo Canceller - 3U (10 per Chassis)

Copyright : Valiant Communications Limited Slide 3 Product Overview The Echo Canceller supports fax/modem G.164 and G.165 (2100Hz) tone disable function The Echo Canceller equipment offers fault recovery feature. It offers automatic by-pass upon power supply failure/removal power supply. (i.e. it offers E1 circuit by-pass in the event of power supply failure) E1 Echo Canceller signaling protocols supported: –30B+D PRI ISDN (Euro ISDN) signaling, –31B (31 voice channels) with out-of-band signaling, –R2 CAS Signaling, –SS7 Signaling (on any user selected time-slot) –All signaling options are User Selectable/User Configurable. E1 Voice Echo Canceller - 3U (10 per Chassis) Types of Echo canceller offered User Selectable: 128ms - Unidirectional (cancels the echo with upto 128ms tail at the far end) 64ms - Bidirectional (cancels the echo with upto 64ms tail in both directions)

Copyright : Valiant Communications Limited Slide 4 Applications Datacomm Applications: Voice Over Frame Relay, Voice Over ATM, Voice Over Internet/LAN (VoIP). Central Office and PBX Applications: Network Trunks, Echo Canceller Pool, Common Equipment, Audio Conferencing Bridges. Voice Over ATM Applications: A multi-channel echo canceller resource or pool is shared among many channels to reduce cost, Echo cancellation is done at a DS0 level. Satellite Communications Applications: Digital Circuit Multiplication Equipment (DCME). Wireless Applications: Digital Cordless and Cellular Basestations, GSM, CDMA, Access Controllers. Voice Over Frame Relay, ATM Applications: Frame Relay and ATM routers and switches introduce large, variable, and unpredictable delays. Echoes from the Public Switched Telephone Network (PSTN) in combination with the delays from Frame Relay and ATM. Equipment yield objectionable speech quality. E1 Voice Echo Canceller - 3U (10 per Chassis)

Copyright : Valiant Communications Limited Slide 5 Features & Highlights E1 Voice Echo Canceller - 3U (10 per Chassis) 64 ms/128 ms echo cancellation confirms to ITU-T G.165 and G.168 ITU-T G.164/G.165 Disable Tone detection supported on all audio paths Non-Linear Processor with adaptive suppression threshold and comfort noise insertion Programmable Double-Talk detection threshold Narrow-Band signal detection Selectable/A-Law ITU-T G.711; /A- Law Sign Magnitude; linear 2's complement Adjustable Gain/Loss settings on all channels. Provides the user the flexibility to adjust and optimize the voice and transmit receive levels Carrier-grade voice quality per AT&T Voice Quality Assessment Lab Ideally suited to handle most echo situations Assures operability with V.32/V.32bis/V.34 modem and fax transmissions. Conforms to standards assuring proper public network operation and facilitating system integration

Copyright : Valiant Communications Limited Slide 6 Features & Highlights E1 Voice Echo Canceller - 3U (10 per Chassis) Removes residual echo and minimizes switching effects thereby providing high perceived speech quality Ensure echo canceller maintains excellent performance at all times in the presence of non-echo voice signals. Useful for trunks that have very low echo-returns loss Ensure echo canceller maintains excellent performance at all times in presence of tones or signals including DTMF tones Instability detector suppresses variable pitched ringing or oscillation E1 Circuit by pass on power failure Path change detect permits fast re-convergence when a major change occurs in the echo channel Fully integrated independent 30-channel voice echo canceller.

Copyright : Valiant Communications Limited Slide 7 E1 Echo Canceller ATM or Frame Relay Multi-Service WAN Gateway PSTN WAN ATM or Frame Relay Equipment CPE/PBX E1 To cancel echoes at both ends of the network with two 128ms. unidirectional echo cancellers E1 Echo Canceller VCL - EC128 Tail -end side E1 Voice Echo Canceller - 3U (10 per Chassis) APPLICATION 1

Copyright : Valiant Communications Limited Slide 8 E1 Voice Echo Canceller - 3U (10 per Chassis) Satellite link PBX E1 Echo Canceller E1 Echo Canceller APPLICATION 2 To cancel echoes at both ends of the network with two 128ms. unidirectional echo cancellers Tail -end side VCL - EC128

Copyright : Valiant Communications Limited Slide 9 E1 Voice Echo Canceller - 3U (10 per Chassis) ATM or Frame Relay Equipment ATM or Frame Relay Multi-Service WAN Gateway PSTN WAN ATM or Frame Relay Equipment CPE/PBX E1 Echo Canceller * This end hears no echo E1 APPLICATION 3 Tail -end side To cancel the near-end echo with one 128ms. unidirectional echo canceller USER VCL - EC128

Copyright : Valiant Communications Limited Slide 10 E1 Voice Echo Canceller - 3U (10 per Chassis) APPLICATION 4 ATM or Frame Relay Equipment ATM or Frame Relay Multi-Service WAN Gateway PSTN WAN E1 Echo Canceller ATM or Frame Relay Equipment CPE/PBX * This end hears no echo USER E1 To cancel the far-end echo with one 128 ms. unidirectional echo canceller Tail -end side VCL - EC128

Copyright : Valiant Communications Limited Slide 11 E1 Voice Echo Canceller - 3U (10 per Chassis) APPLICATION 5 To cancel echo at both ends of the network with one 64ms. bidirectional echo canceller ATM or Frame Relay Equipment ATM or Frame Relay Multi-Service WAN Gateway PSTN WAN E1 Echo Canceller ATM or Frame Relay Equipment CPE/PBX * This end hears no echo USER E1 VCL - EC64B * This end hears no echo

Copyright : Valiant Communications Limited Slide 12 E1 Voice Echo Canceller - 3U (10 per Chassis) Front Panel View of Echo Canceller Front View (Left to Right)Card Details Valiant Part No. Slot 1: PS, Power Supply Card VCL-EC-1295 Slot 2: PS, Power Supply Card VCL-EC-1295 Slot 3 to Slot 12: EC, Echo Canceller Card VCL-EC-1273-E1 (64 ms/128 ms Echo Cancellation) Slot 13: NMS Card VCL-EC-1222

Copyright : Valiant Communications Limited Slide 13 E1 Voice Echo Canceller - 3U (10 per Chassis) Network Interface Number of Interfaces2, 1 - Input (RJ-45), 1 - Output (RJ-45) Line RateE Mbps Line CodeHDB3 as per ITU-T G.703, G.704 Frame StructureAs per ITU-T G.704 PCM Encoding LawA Law as per ITU-T G.711 SignalingPass-Through Signaling protocols supported: - 30B+D PRI ISDN (Euro ISDN) signaling - 31B (31 voice channels) with out-of-band signaling - R2 CAS Signaling - SS7 signaling (on any user selected time-slot) - All signaling options are User Selectable/ User Configurable PCM Sampling Rate8000 Samples/sec Bit Rate2048 Kbps ± 50 ppm Jitter ToleranceAs per ITU-T G.823 Technical Specifications

Copyright : Valiant Communications Limited Slide 14 E1 Voice Echo Canceller - 3U (10 per Chassis) Output Jitter< 0.05 UI (in the frequency range of 20Hz to 100 KHz) Nominal Line Impedance120 Ohms Balanced RJ-45 Nominal Pulse Width244ns Pulse MaskAs per ITU (CCITT) Rec. G.703 Loss and recovery of frame As per clause 3 of ITU (CCITT) G.732 alignment Loss and recovery of As per clause 5.2 of ITU (CCITT) G.732 multiframe Alignment Echo Cancellation Echo Tail CancellationUp to 64ms bidirectional/128ms unidirectional User Selectable Tone DisablerAs per ITU-T G.164, G.165 ERLE (Echo Return Loss >35dB (with 6dB ERL) at -10dBm0 input Enhancement)>65dB with NLP enabled ERL (Echo Return Loss)Selectable Levels Options: 0, 3, 6dB Technical Specifications

Copyright : Valiant Communications Limited Slide 15 E1 Voice Echo Canceller - 3U (10 per Chassis) Transmit/Receive Levels Selectable Levels Options: (Programmable)-12, -9, -6, -3,,0 +3, +6, +9 Comfort Noise InsertionUser Selectable - ON/OFF Local Monitoring and ControlRS232 serial interface for Management through a PC COM Port Remote Monitoring and ControlEthernet (10BaseT) interface for remote LAN Management and Control Local and Remote ProvisioningCLI (text commands) and GUI Front Panel Indicators- In SYNC/Failure - Equipment alarm - LEDs for power on/off Power Supply RedundancyOptional: -48V DC Power Supply (1+1) Environmental - Operational0°C to 50°C Humidity5% to 95%, non-condensing Technical Specifications

Copyright : Valiant Communications Limited Slide 16 E1 Voice Echo Canceller - 3U (10 per Chassis) Input DC voltage-48V DC (nominal ) Range of Input Voltage-40V to -60V DC Output voltage+5V Maximum Full Load Output Current10A at +5V Input Voltage Reversal ProtectionProvided in the Card Over Current Protection> 10A for +5V Short Circuit ProtectionCurrent limit - 10A. Recovers on removal of short Under Voltage< 4.5V Over Voltage5.4V Efficiency at full load>86% Ripple at full load<5mVrms Spike at full load<50mV Power Supply Specifications

Copyright : Valiant Communications Limited Slide 17 Management Port Specifications 10BaseT LAN Management Port (with Telnet) Network InterfaceRJ-45 Ethernet 10BaseT or 100 BaseT-TX (auto sensing) CompatibilityEthernet Version 2.0 IEEE802.3 Protocols SupportedARP, UDP/IP, TCP/IP, Telnet, ICMP, SNMP, DHCP, BOOTP, TFTP, Auto IP, SMTP and HTTP LEDs10Base-T & 100Base-TX Activity, Full / half duplex ManagementSerial login, Telnet login, GUI EMI Compliance - Radiated and conducted emissions - complies with Class B limits of EN55022: Direct and Indirect ESD - complies with EN55024: RF Electromagnetic Field Immunity - complies with EN55024: Electrical Fast Transient / Burst Immunity - complies with EN55024: Power Frequency Magnetic Field Immunity - complies with EN55024: RF Common Mode Conducted Susceptibility - complies with EN55024:1998 E1 Voice Echo Canceller - 3U (10 per Chassis)

Copyright : Valiant Communications Limited Slide 18 E1 Voice Echo Canceller - 3U (10 per Chassis) Mechanical Specifications Rack MountingStandard 19 Inch. DIN Rack Height mm. Depth292 mm. Width 482 mm. Weight7.50 (10, E1 Echo canceller) Power Consumption Card in Use Current Power Consumption (in Amps.) (in Watts) Input Voltage = - 48 Volt 1 EC Card + PSU Card + NMS Card EC Cards + PSU Card + NMS Card

Copyright : Valiant Communications Limited Slide 19 E1 Voice Echo Canceller - 3U (10 per Chassis) Compliance/Regulatory EMC FCC Part 15 Class 2 Operation ETS Class 3.2 Storage ETS Class 1.2 Transportation ETS Class 2.3 CE Clock Internal (Stratum 3 level) Loop-timed Port A/Port B (User Selectable) Management Port Specifications RS232 COM Port Serial Port: 9.6Kbps (Async). ASCII/VT100/HyperTerminal. 10BaseT Ethernet: Telnet

Copyright : Valiant Communications Limited Slide 20 E1 8 x Echo canceller with VQE - Compact 1U Shelf T1 8 x Echo canceller with VQE - Compact 1U Shelf E1 Echo canceller - 3U Version (10 EC’s per Chassis) T1 Echo canceller - 3U Version (10 EC’s per Chassis) E1 Echo canceller - Desktop Version T1 Echo canceller - Desktop Version E1 Echo canceller 1U with Telnet - 1U T1 Echo canceller 1U with Telnet - 1U QUAD E1 Echo canceller (32 EC’s per Chassis) QUAD T1 Echo canceller (32 EC’s per Chassis) DS3 Echo canceller with VQE Valiant’s Echo Canceller Solutions: E1 Voice Echo Canceller - 3U (10 per Chassis)

Copyright : Valiant Communications Limited Slide 21 Thank you for your attention For more details visit us at our Website at E1 Voice Echo Canceller - 3U (10 per Chassis) U.K. Valiant Communications (UK) Ltd 1, Acton Hill Mews, Uxbridge Road, London W3 9QN, United Kingdom Website: INDIA Valiant Communications Limited 71/1, Shivaji Marg, New Delhi , India Phone: , Fax: , Website: U.S.A. Valcomm Technologies Inc Ponce de Leon, Suite 470 Coral Gables, FL United States of America Website: