Slide 1Copyright : Valiant Communications Limited - 2007 VCL-EC TM E1 Echo Canceller 1U, 19 inch Version with Telnet V aliant C ommunications L imited.

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Slide 1Copyright : Valiant Communications Limited VCL-EC TM E1 Echo Canceller 1U, 19 inch Version with Telnet 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: U.S.A. Valcomm Technologies Inc Ponce de Leon, Suite 470 Coral Gables, FL United States of America Website: INDIA Valiant Communications Limited 71/1, Shivaji Marg, New Delhi , India Website:

Slide 2Copyright : Valiant Communications Limited Product Overview Valiant offers a compact, robust and cost effective E1 echo canceller solution in 19 inch, 1U high (44mm height) chassis (accomodates 1, E1 echo canceller with telnet, per shelf). Echo cancellation on each channel is 64ms. Bidirectional/128ms. Unidirectional echo tails-user selectable. T1 echo cancellers are also offered and available. Valiant offers echo cancellation and voice quality enhancement solutions for the following network situations: - Wireline- Wireless - IP Gateways- Satellite - International Gateways E1 Echo Canceller - 1U with Telnet

Slide 3Copyright : Valiant Communications Limited Type of E1 Echo Canceller offered E1 echo canceller solution in 19 inch, 1U high (44mm height) chassis and accomodates 1, E1 echo canceller with telnet, per shelf. Echo cancellation on each channel is 64ms. Bidirectional/128ms. Unidirectional echo tails-user selectable. E1 Inputs and Outputs are balanced 120 Ohms., RJ-45. Ideally suited for long distance telephony, GSM, CDMA, TDMA, VoIP, satellite and radio communication applications. Offers fault recovery feature. Offers automatic by-pass upon power-supply failure (i.e. it offers E1 circuit by-pass in the event of power supply failure). Product Overview E1 Echo Canceller - 1U with Telnet

Slide 4Copyright : Valiant Communications Limited Unique E1 Echo Canceller Features USER PROGRAMMABLE TAIL-SIDE: User Configurable echo tail-side so that the USER may remotely change the direction of the tail-side of the echo canceller - without having to physically change the E1 connections on the echo-canceller card. USER PROGRAMMABLE SIGNALING OPTION: The E1 echo cancellers support the following signaling protocols: Signaling Pass-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 Uer Selectable/User Programmable. USER PROGRAMMABLE DEDICATED DATA CHANNELS: The User may specify/ define the dedicated data channels so that they are ALWAYS and COMPLETELY BYPASSED from the echo-cancellation circuitry - leaving those specifically assigned dedicated time-slots for digital data transmission (including video transmission). The E1 echo canceller supports 2100Hz fax/analog data modem tone detection and echo canceller disabling on all channels. E1 Echo Canceller - 1U with Telnet

Slide 5Copyright : Valiant Communications Limited Compact E1 echo canceller solution in 19 inch, 1U high (44mm height) chassis and accomodates 1, E1 echo canceller with telnet, per shelf. Provides voice echo cancellation of up to 64ms. Bidirectional/128ms. Unidirectional- User Selectable/User Programmable. Meets ITU-T G.164, G.165, G.168 (2000/2002) requirements for echo cancellation. The echo canceller supports fax/modem G.164 and G.165 (2100Hz) tone disable. Carrier-grade voice quality per AT&T Voice Quality Assessment Lab. Remote access through telnet over LAN/TCP-IP link (10/100BaseT). Local access through COM port (RS232 serial port). Easy-to-use Graphical User Interface (GUI) text based CLI commands for management and configuration. Adjustable gain/loss settings on all channels. Provides the user the flexibility to adjust and optimize the voice, transmit and receive levels. Non-Linear Processor with Comfort Noise Insertion. Highlights E1 Echo Canceller - 1U with Telnet

Slide 6Copyright : Valiant Communications Limited E1 link by-pass on power failure. This feature helps to maintain the link integrity even in the event of power failure. Option for user to select voice echo cancellation or digital-data transmission selectively on each time-slot for selective echo cancellation. This feature allows the user to use selected time-slots for data transmission to enable digital data/CCS signaling transmission. Transmission (data mode), while keeping the echo cancellation "ON" on the remaining time-slots (voice mode), on which echo is required to be cancelled. Ensure echo canceller maintains excellent performance at all times in presence of tones or signals including DTMF tones. Fully integrated independent 24-channel voice echo canceller. Highlights E1 Echo Canceller - 1U with Telnet

Slide 7Copyright : Valiant Communications Limited The E1 echo cancellers supports the following signaling protocols: Signaling Pass-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 Programmable. Signaling Support E1 Echo Canceller - 1U with Telnet Clock Internal Loop-timed (Stratum 3 Level) External75-Ohms Mhz Mhz

Slide 8Copyright : Valiant Communications Limited GSM, CDMA, TDMA and Cellular Base Stations. Digital Circuit Multiplication Equipment (DCME) - Satellite Communications and Multiplexers: PCS, mobile, and digital cordless wireless systems. PBX and central office systems. Datacomm: - Voice Over Frame Relay, - Voice Over ATM, and - Voice Over Internet. Voice over ATM, Frame Relay or packet switching systems and fax transmissions. Central Office and PBX: - Network Trunks, - Echo Canceller Pool, - Common Equipment and - Audio Conferencing Bridges Voice over datacomm including voice over Internet (VoIP), voice over ATM (VoATM), and voice over Frame Relay (VoFR). Applications E1 Echo Canceller - 1U with Telnet

Slide 9Copyright : Valiant Communications Limited Technical Specifications 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 PCM Sampling Rate8000 Samples/sec Bit Rate2048Kbps ± 50ppm Jitter ToleranceAs per ITU-T G.823 Output Jitter< 0.05 UI (in the frequency range of 20Hz to 100KHz) Nominal Line Impedance120 Ohms Balanced RJ-45 Nominal Pulse Width244ns Pulse MaskAs per ITU (CCITT) Rec. G.703 Loss and recovery ofAs per clause 3 of ITU (CCITT) G.732 frame alignment Loss and recovery of As per clause 5.2 of ITU (CCITT) G.732 multiframe alignment E1 Echo Canceller - 1U with Telnet Network Interface

Slide 10Copyright : Valiant Communications Limited Echo Cancellation Echo Tail CancellationUp to 64ms. Bidirectional/128ms. Unidirectional User Selectable Tone DisablerAs per ITU-T G.164, G.165 ERLE (Echo Return >35dB (with 6dB ERL) at -10dBm0 Loss Enhancement)>65dB with NLP enabled ERL (Echo Return Loss)Selectable Threshold Levels Options: 0, 3, 6dB Transmit/Receive Levels Selectable Levels Options: (Programmable)-12, -9, -6, -3,,0 +3, +6, +9 Comfort Noise InsertionUser Selectable - Enable/Disable Local Monitoring and RS232 serial interface for Management through a Control PC COM Port Local and Remote Provisioning CLI (text commands) and GUI Front Panel Indicators -In SYNC/Failure -LEDs for power on/off Environmental-Operational 0 0 C to 50 0 C Humidity 5% to 95%, non-condensing Technical Specifications E1 Echo Canceller - 1U with Telnet

Slide 11Copyright : Valiant Communications Limited Power Supply Specifications Input DC voltage-48V DC (nominal ) Range of input-40V to -60V DC Output voltages+5V Full Load Output Current4A at +5V Input Voltage Reversal ProtectionProvided in the card Over Current Protection10A for +5V Short Circuit ProtectionCurrent limit - 10A. Recovers on removal of short Under Voltage< 4.5V Over Voltage5.4V to 5.6V Efficiency at full load>70% Ripple at full load<5mVrms Spike at full load<50mV E1 Echo Canceller - 1U with Telnet Power Consumption Input Voltage Current Power Consumption = -48V DC (in Amps.) (in Watts) 1 Unit

Slide 12Copyright : Valiant Communications Limited E1 8 x Echo Cancellers - Compact 1U Shelf T1 8 x Echo Cancellers - Compact 1U Shelf E1 Echo Cancellers - 3U Version (10 EC’s per Chassis) T1 Echo Cancellers - 3U Version (10 EC’s per Chassis) E1 Echo Cancellers - Desktop Version T1 Echo Cancellers - Desktop Version E1 Echo Cancellers 1U with Telnet - 1U T1 Echo Cancellers 1U with Telnet - 1U E1 Echo Cancellers - High Density (32 EC’s per Chassis) T1 Echo Cancellers - High Density (32 EC’s per Chassis) DS3 Echo Cancellers Valiant’s Echo Cancellers Solutions: E1 Echo Canceller - 1U with Telnet

Slide 13Copyright : Valiant Communications Limited Thank you for your attention For more details visit us at our Website at E1 Echo Canceller - 1U with Telnet U.K. Valiant Communications (UK) Ltd 1, Acton Hill Mews, Uxbridge Road, London W3 9QN, United Kingdom Website: U.S.A. Valcomm Technologies Inc Ponce de Leon, Suite 470 Coral Gables, FL United States of America Website: INDIA Valiant Communications Limited 71/1, Shivaji Marg, New Delhi , India Website: