1. Copyright, Valiant Communications Limited - 2006Slide 1 Updated : January, 2006 V aliant C ommunications L imited Telecom Transmission Solutions VCL-LD TM E1, Digital Voice Compression Equipment (Digital Circuit Multiplication Equipment - DCME) U.K. Valiant Communications (UK) Ltd 1, Acton Hill Mews, 310-328 Uxbridge Road, London W3 9QN, United Kingdom E-mail: gb@valiantcom.com Website: http://www.valiantcom.com INDIA Valiant Communications Limited 71/1, Shivaji Marg, New Delhi - 110015, India Phone: +91-11 4105 5601, 91-11 4105 5602 Fax: +91-11 4105 5604, 91-11 2543 4300 E-mail: getinfo@valiantcom.com Website: http://www.valiantcom.com U.S.A. Valcomm Technologies Inc. 4000 Ponce de Leon, Suite 470 Coral Gables, FL 33146 United States of America E-mail: us@valiantcom.com Website: http://www.valiantcom.com

2. Copyright, Valiant Communications Limited - 2006Slide 2 VCL-LD TM E1, DCME (Digital Circuit Multiplication Equipment) Voice Compression Equipment. Provides 30, "toll quality" voice channels using an 8:1 compression ratio (10:1 Compression Ratio without signaling), in a bandwidth of 256kbps*. This is accomplished using an advanced digital signal processor (DSP) based Virterbi decoder with automatic voice / silence detection (VAD) and adaptive comfort noise generation (CNG). ITU-T G.703, G.704 interface compliant. E1 signaling support for R2, CAS (ABCD) Digital Signaling, PRI ISDN (Q.931), SS7 and C7 Signaling. Proven to outperform CELP, RELP, VSELP, MELP, ECELP, MP-MLQ, LPC-10 and other competitive technologies. VCL-LD, E1 Voice Compression Equipment Introduction

3. Copyright, Valiant Communications Limited - 2006Slide 3 Satellite Communications. Digital Mobile Radio Secure Communications Cellular Telephony and PCS Voice Multiplexing VCL-LD, E1 Voice Compression Equipment Applications Long Distance Telephony Prepaid Calling Card Service Call Center Applications Rural Telephony Voice Mail

4. Copyright, Valiant Communications Limited - 2006Slide 4 Support for multiple signaling platforms including CAS R2, PRI ISDN and SS7 # Signaling. Echo cancellation: Echo canceller card cancels echo up to 128ms. E1, 30 voice channels in 256Kbps bandwidth (4, DS-0's ) for voice only application. E1, 30 voice channels in 384Kbps (6, DS-0’s ) for voice, fax and data modem support. Ideal choice for satellite communications, digital mobile radios, cellular network, long distance telephony service providers (including pre-paid calling card operators), corporate customers for linking intercity voice networks, national and international call-center applications, and ISPs wishing to provide reliable long distance telephony service to their customers. Modular Architecture - reduces downtime - dual port per card. Scalable - Build as you grow. Transport over point-to-point satellite links and dedicated leased lines. Superior Voice Quality. Robust to Bit Errors & Background Noise. VCL-LD, E1 Voice Compression Equipment Features

5. Copyright, Valiant Communications Limited - 2006Slide 5 VCL-LD, E1 Voice Compression Equipment High Quality Low Data Rate Speech Coding. Forward Error Correction. Voice Activity Detection (VAD) / Comfort Noise Insertion. Single and Dual Tone (DTMF) Detection and Generation. Minimal algorithmic processing delay. DTMF detection and regeneration. Support fax and data modems @ upto 33.6Kbps data rates. Features E1, 30 Toll-Quality voice channels in 256Kbps of bandwidth. 8:1 compression ratio (10:1 without signaling channel). 128 ms. adaptive Echo Cancellation. DSP based Viterbi Decoder for superior voice quality. 3U high, compact construction. Extensive set of alarms. User selectable clock sources. Support fax and data modems @ upto 33.6Kbps data rates. Highlights

6. Copyright, Valiant Communications Limited - 2006Slide 6 Voice Quality Vs. Bit Rate Mean Opinion Score:MOS 4.0 3.5 3.0 2.5 2.0 1.5 1.0 VCL-LD, E1 Voice Compression Equipment Performance

7. Copyright, Valiant Communications Limited - 2006Slide 7 International & Domestic Long Distance Telephony - A Fractional E1 Compressed @ 256 kbps Satellite / Leased Line E1, CAS R2 PRI ISDN (Euro ISDN) C7, SS7 Signaling E1, CAS R2 PRI ISDN (Euro ISDN) C7, SS7 Signaling PSTN Switch PSTN Switch VCL-LD VCL-LD, E1 Voice Compression Equipment Application of VCL-LD TM DCME

8. Copyright, Valiant Communications Limited - 2006Slide 8 PRI ISDN (23B+D) or E1 C7/SS7 Signaling 256K Compressed E1 Fractional E1 Format 256K Compressed E1 Fractional E1 Format Satellite link PRI ISDN (23B+D) or E1 C7/SS7 Signaling E1 VCL-LD E1 DCME VCL-LD E1 DCME VCL-LD, E1 Voice Compression Equipment Long Distance Application - B Application of VCL-LD TM DCME

9. Copyright, Valiant Communications Limited - 2006Slide 9 E1, CAS R2 PRI ISDN (Euro ISDN) C7, SS7 Signaling Fractional E1 Compressed @ 256 kbps Satellite / Leased Line PSTN Switch Call Centre VCL-LD VCL-LD TM VCL-LD, E1 Voice Compression Equipment Call Center Application Application of VCL-LD TM DCME

10. Copyright, Valiant Communications Limited - 2006Slide 10 Satellite link E1 256K E1 VCL-LD E1 DCME 256K Compressed E1 Fractional E1 256K Compressed E1 Fractional E1 VCL-LD E1 DCME VCL-LD E1 DCME VCL-LD E1 DCME 256K Compressed E1 Fractional E1 256K Compressed E1 Fractional E1 256K VCL-LD E1 DCME VCL-LD E1 DCME VCL-E1 DACS 256K x “n” Value of “n” = number of compressed E1’s in Fractional E1 Format VCL-LD, E1 Voice Compression Equipment Long Distance Telephony 2 or Multiple E1’s - DCME Application

11. Copyright, Valiant Communications Limited - 2006Slide 11 19 inch Shelf The detailed equipment components of the VCL-LD are listed below: 1. One, VCL-LD, 19 inch shelf and Connectorized Backpanel 2. One, -48 VDC, Power Supply Card 3. One, E1, Echo Canceller Card (128 ms. echo cancellation) 4. One, E1, Interface Card, provides one uncompressed E1 interface and one compressed E1 interface. 5. DS-0, aggregate 10 compressed voice channels to a DS-0 (3 cards per system - maximum) 6. Voice compression card, Dual channel voice compression card, (15 cards per system - maximum) Voice Compression Cards DS-0 Card Voice Compression Cards DS-0 Card E1 Interface Card Echo Canceller Card Voice Compression Cards Power Supply Card VCL-LD, E1 Voice Compression Equipment Front Panel View of VCL-LD

12. Copyright, Valiant Communications Limited - 2006Slide 12 VCL-LD, E1 Voice Compression Equipment Technical Specifications Digital Network (PSTN) Interface 2048 Kbps Telco - E1 Number of E1 Interfaces1 Maximum number of Voice Channels per E1 Interface30 ConformityG. 703 Frame StructureAs per ITU (CCITT) G.704 PCM Sampling Rate8000 samples / sec Encoding LawA law as per ITU (CCITT) G.711 Bit Rate2048 Kbps ± 50 ppm CodeHDB3 Nominal Impedance120 balanced (75 unbalanced* - optional). Pulse MaskAs per ITU (CCITT) Rec. G.703 Output Jitter< 0.05 UI (in the frequency range of 20Hz to 100Khz) Permissible Attenuation6 dB at 1 MHz 2048 KHz to 3072 KHz>14dB Jitter ToleranceAs per ITU (CCITT) G.823 Supported SignalingChannel Associated Signaling, R2 Signaling PRI (Primary Rate) ISDN Signaling (Q.931), C7, SS7 Signaling.

13. Copyright, Valiant Communications Limited - 2006Slide 13 VCL-LD, E1 Voice Compression Equipment Technical Specifications Clock Synchronization Synchronization SourcesInternal Clock, or, Timing derived from the E1, HDB3 link (Loop-Timed Clock) Default OptionInternal Clock Digital Carrier Interface 256 Kbps (Fractional E1) Compressed - E1 (voice only application) Number of E1 Interfaces1 - Fractional E1 Interface @ 256Kbps Number of DS-0s4 (First Four Time-Slots) ConformityG. 703 Frame StructureG.704 Bit Rate2048 Kbps ± 50 ppm CodeHDB3 Nominal Impedance120 balanced (75 unbalanced - optional) Pulse MaskAs per ITU (CCITT) Rec. G.703 Output Jitter< 0.05 UI (in the frequency range of 20Hz to 100 KHz) Permissible Attenuation6 dB at 1 MHz

14. Copyright, Valiant Communications Limited - 2006Slide 14 VCL-LD, E1 Voice Compression Equipment Technical Specifications Digital Carrier Interface 256 Kbps (Fractional E1) Compressed - E1 (voice only application) Return Loss at: 51.2 KHz to 102.4 KHz>12dB 102.4 KHz to 2048KHz>18dB 2048KHz to 3072 KHz>14dB Jitter ToleranceAs per ITU (CCITT) G.823 Digital Carrier Interface 384 Kbps (Fractional E1) Compressed - E1 (voice, fax & data modem support @ upto 33.6Kbps tramsmission) Number of E1 Interfaces1 - Fractional E1 Interface @ 384Kbps Number of DS-0s6 (First Six Time-Slots) ConformityG. 703 Frame StructureG.704 Bit Rate2048 Kbps ± 50 ppm CodeHDB3 Nominal Impedance120 balanced (75 unbalanced - optional) Pulse MaskAs per ITU (CCITT) Rec. G.703

15. Copyright, Valiant Communications Limited - 2006Slide 15 VCL-LD, E1 Voice Compression Equipment Technical Specifications Digital Carrier Interface 384 Kbps (Fractional E1) Compressed - E1 (voice, fax & data modem support @ upto 33.6Kbps tramsmission) Output Jitter< 0.05 UI (in the frequency range of 20Hz to 100 KHz Permissible Attenuation6 dB at 1 Mhz Return Loss at: 51.2 KHz to 102.4 KHz>12dB 102.4 KHz to 2048KHz>18dB 2048KHz to 3072 KHz>14dB Jitter ToleranceAs per ITU (CCITT) G.823 Power Supply Input DC voltage-48V DC ( nominal ) Range of input-40V to -60V DC Power ConsumptionLess than 20 Watts (at full load) -48VDC Input Voltage Reversal Provided (Standard) Protection Auto-SensingOptional (External Supply)

16. Copyright, Valiant Communications Limited - 2006Slide 16 VCL-LD, E1 Voice Compression Equipment Echo Cancellers - Technical Specifications Provides voice echo cancellation of up to 128ms Conforms to ITU-T G.165 and ITU-T G.168 G.164 /G.165 disable tone detection Non-Linear Processor with Comfort Noise Insertion Narrow-Band Detector Eliminates long echo tail. Environmental CoolingNatural, Convection cooling Temperature0°C to 50°C, Ambient Mechanical Dimensions Rack MountingStandard 19 inch DIN rack Height3U, 133.35mm Depth292mm Width482mm Weight (Net) 8.50 Kgs.

17. Copyright, Valiant Communications Limited - 2006Slide 17 VCL-LD, E1 Voice Compression Equipment Valiant’s Products Digital Access Cross Connects - E1/T1, E3, DS3,10/100BaseT Ethernet Groomers for Hi-Z Non-Intrusive Hi-Impedance Monitoring - E1, T1, STM-1 Echo Cancellers & Voice Quality Enhancement Solutions - E1, T1, DS3 and STM-1 STM-1, STM-4 and STM-16 ADM SDH Multiplexers E1 Drop-Insert (Add-Drop) Voice and Data Multiplexers Ethernet Converters: E1, T1, E3, DS3, STM-1 (Ethernet over STM-1) E1 / T1 TDM over IP E1 PRI ISDN (Euro ISDN) Q.931 Multiplexers E1 Channel Banks E2 (4E1), 2/34 Mbps PDH Multiplexer, 34Mbps OLTE 1+1 APS (Automatic Protection Switching) Remote Site Monitoring Equipment

18. Copyright, Valiant Communications Limited - 2006Slide 18 Thank you for your attention For more details visit us at our Website at http://www.valiantcom.com VCL-LD, E1 Voice Compression Equipment U.K. Valiant Communications (UK) Ltd 1, Acton Hill Mews, 310-328 Uxbridge Road, London W3 9QN, United Kingdom E-mail: gb@valiantcom.com Website: http://www.valiantcom.com INDIA Valiant Communications Limited 71/1, Shivaji Marg, New Delhi - 110015, India Phone: +91-11 4105 5601, 91-11 4105 5602 Fax: +91-11 4105 5604, 91-11 2543 4300 E-mail: getinfo@valiantcom.com Website: http://www.valiantcom.com U.S.A. Valcomm Technologies Inc. 4000 Ponce de Leon, Suite 470 Coral Gables, FL 33146 United States of America E-mail: us@valiantcom.com Website: http://www.valiantcom.com