Copyright, Valiant Communications Limited Slide 1 Updated : January, 2006 V aliant C ommunications L imited Telecom Transmission Solutions VCL-LD TM T1, Digital Voice Compression Equipment (Digital Circuit Multiplication Equipment - DCME) 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 VCL-LD TM T1, DCME (Digital Circuit Multiplication Equipment) Voice Compression Equipment. Provides 24, "toll quality" voice channels using an 6:1 compression ratio (8:1 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. T1 signaling support for PRI ISDN (Q.931), SS7 / C7, common channel Signaling. Proven to outperform CELP, RELP, VSELP, MELP, ECELP, MP-MLQ, LPC-10 and other competitive technologies. VCL-LD, T1 Voice Compression Equipment Introduction

Copyright, Valiant Communications Limited Slide 3 Satellite Communications. Digital Mobile Radio Secure Communications Cellular Telephony and PCS Voice Multiplexing VCL-LD, T1 Voice Compression Equipment Applications Long Distance Telephony Prepaid Calling Card Service Call Center Applications Rural Telephony Voice Mail

Copyright, Valiant Communications Limited Slide 4 Support for multiple signaling platforms including PRI ISDN and SS7 / C7 common channel Signaling. Echo cancellation: Echo canceller card cancels echo up to 128ms. T1, 24 voice channels in 256Kbps bandwidth (4, DS-0's ) for voice only application. T1, 24 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, T1 Voice Compression Equipment Features

Copyright, Valiant Communications Limited Slide 5 VCL-LD, T1 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. Features T1, 24 Toll-Quality voice channels in 256Kbps of bandwidth. 6:1 compression ratio (8:1 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 upto 33.6Kbps data rates. Highlights

Copyright, Valiant Communications Limited Slide 6 Voice Quality Vs. Bit Rate Mean Opinion Score:MOS VCL-LD, T1 Voice Compression Equipment Performance

Copyright, Valiant Communications Limited Slide 7 International & Domestic Long Distance Telephony - A Fractional T1 256 kbps Satellite / Leased Line T1 PRI ISDN (Euro ISDN) C7, SS7 Signaling T1 PRI ISDN (Euro ISDN) C7, SS7 Signaling PSTN Switch PSTN Switch VCL-LD VCL-LD, T1 Voice Compression Equipment Application of VCL-LD TM DCME

Copyright, Valiant Communications Limited Slide 8 PRI ISDN (23B+D) or T1 C7/SS7 Signaling 256K Compressed T1 Fractional T1 Format 256K Compressed T1 Fractional T1 Format Satellite link PRI ISDN (23B+D) or T1 C7/SS7 Signaling T1 VCL-LD T1 DCME VCL-LD T1 DCME VCL-LD, T1 Voice Compression Equipment Long Distance Application - B Application of VCL-LD TM DCME

Copyright, Valiant Communications Limited Slide 9 T1 PRI ISDN (Euro ISDN) C7, SS7 Signaling Fractional T1 256 kbps Satellite / Leased Line PSTN Switch Call Centre VCL-LD VCL-LD TM VCL-LD, T1 Voice Compression Equipment Call Center Application Application of VCL-LD TM DCME

Copyright, Valiant Communications Limited Slide 10 Satellite link T1 256K T1 VCL-LD T1 DCME 256K Compressed T1 Fractional T1 256K Compressed T1 Fractional T1 VCL-LD T1 DCME VCL-LD T1 DCME VCL-LD T1 DCME 256K Compressed T1 Fractional T1 256K Compressed T1 Fractional T1 256K VCL-LD T1 DCME VCL-LD T1 DCME VCL-T1 DACS 256K x “n” Value of “n” = number of compressed T1’s in Fractional T1 Format VCL-LD, T1 Voice Compression Equipment Long Distance Telephony 2 or Multiple T1’s - DCME Application

Copyright, Valiant Communications Limited Slide 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, T1, Echo Canceller Card (128 ms. echo cancellation) 4. One, T1, Interface Card, provides one uncompressed T1 interface and one compressed T1 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 T1 Interface Card Echo Canceller Card Voice Compression Cards Power Supply Card VCL-LD, T1 Voice Compression Equipment Front Panel View of VCL-LD

Copyright, Valiant Communications Limited Slide 12 VCL-LD, T1 Voice Compression Equipment Technical Specifications Digital Network (PSTN) Interface 1544 Kbps Telco - T1 Number of T1 Interfaces1 Maximum number of Voice Channels per T1 Interface24 ConformityG. 703 Frame StructureAs per ITU (CCITT) G.704 Framing OptionsD4, ESF (Selectable) PCM Sampling Rate8000 samples / sec Encoding Law  law as per ITU (CCITT) G.711 Bit Rate1544 Kbps ± 50 ppm CodeB8ZS, AMI (Selectable) Nominal Impedance100  balanced. Pulse MaskAs per ITU (CCITT) Rec. G.703 Output Jitter< 0.05 UI (in the frequency range of 20Hz to 100Khz) Permissible AttenuationUpto 18db max. (As per ITU-T 1.431) Jitter ToleranceAs per ITU (CCITT) G.823, ITU-T Supported SignalingPRI (Primary Rate) ISDN Signaling (Q.931), SS7 Signaling / C7 Signaling, Common Channel Signaling.

Copyright, Valiant Communications Limited Slide 13 VCL-LD, T1 Voice Compression Equipment Technical Specifications Clock Synchronization Synchronization SourcesInternal Clock, or, Timing derived from the T1, link (Loop-Timed Clock) Default OptionInternal Clock Digital Carrier Interface 256 Kbps (Fractional T1) Compressed - T1 (voice only application) Number of T1 Interfaces1 - Fractional T1 256Kbps Compressed T1, Number of DS-0s4 (First Four Time-Slots) ConformityG. 703 Frame StructureAs per ITU-T G.704 Framing OptionsD4, ESF (Selectable) Bit Rate1544 Kbps ± 50 ppm CodeB8ZS, AMI (Selectable) Nominal Impedance100  balanced. Pulse MaskAs per ITU (CCITT) Rec. G.703 Output Jitter< 0.05 UI (in the frequency range of 20Hz to 100 KHz) Permissible AttenuationUpto 18db max. (As per ITU-T 1.431) Jitter ToleranceAs per ITU (CCITT) G.823

Copyright, Valiant Communications Limited Slide 14 VCL-LD, T1 Voice Compression Equipment Technical Specifications Digital Carrier Interface 384 Kbps (Fractional T1) Compressed - T1 (voice, fax & data modem upto 33.6Kbps tramsmission) Number of T1 Interfaces1 - Fractional T1 384Kbps Number of DS-0s6 (First Six Time-Slots) ConformityG. 703 Frame StructureAs per ITU-T G.704 Framing OptionsD4, ESF (Selectable) Bit Rate1544 Kbps ± 50 ppm CodeB8ZS, AMI (Selectable) Nominal Impedance100  balanced. Pulse MaskAs per ITU (CCITT) Rec. G.703 Output Jitter< 0.05 UI (in the frequency range of 20Hz to 100 KHz Permissible AttenuationUpto 18 db max. (As per ITU-T 1.431) Jitter ToleranceAs per ITU (CCITT) G.823

Copyright, Valiant Communications Limited Slide 15 VCL-LD, T1 Voice Compression Equipment Technical Specifications 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) 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.

Copyright, Valiant Communications Limited Slide 16 VCL-LD, T1 Voice Compression Equipment Environmental CoolingNatural, Convection cooling Temperature0°C to 50°C, Ambient Mechanical Dimensions Rack MountingStandard 19 inch DIN rack Height3U, mm Depth292mm Width482mm Weight (Net) 8.50 Kgs. Technical Specifications

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

Copyright, Valiant Communications Limited Slide 18 Thank you for your attention For more details visit us at our Website at VCL-LD, T1 Voice Compression Equipment 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: