1. Copyright, Valiant Communications Limited 2000-2003 VCL-30, iDSL DSLAM ™ Confidential Slide 1 V aliant C ommunications L imited Telecom Transmission Solutions Updated : Jan 1st, 2003 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 2000-2003 Product Overview Valiant's iDSL Access solution provides up to 15 iDSL (ISDN, Digital Subscriber Line) ports, each port supporting data @ 64/128Kbps on a single twisted pair customer premises Termination on a ISDN "U" interface or V.35 interface @ 128 kbps, 10/100 BaseT Cisco Routers. The transmission range is up to 5 Km. on a 0.4 (26AWG) twisted copper pair. ISDN "U" interface technology with 2B1Q encoding for transmission on twisted pairs. Central Office / ISP Premises iDSL interface card plug directly into the VCL-30 chassis to deliver 128Kbps, 2 wire data from the customer premises into a channelized E1. The VCL-30TM, E1 (Common Equipment) consisting of the following components: E1, Control Cards, 19" Shelf 3U High (sub-rack) Connectorized Backplane (3 U High) and 48VDC Input Power Supply Card Confidential Slide 2

3. Copyright, Valiant Communications Limited 2000-2003 Customer Premises Option # 1 Valiant's Central Offices / ISP Premises iDSL Modem cards - (part # VCL-30-80) can be used with our V.35, baseband modem - part # VCL-30-090 (desk top customer premises modem with V.35 interface). Central Office / ISP premises iDSL modem card - part number VCL-30-080 (used with the VCL-30 Common Equipment) can be used to deliver data @ 128 Kbps to a customer premises up to a distance of 5 Km., on a ordinary 0.5 mm twister copper pair. The Central Office / ISP Premises interface equipment includes the following cards: Confidential Slide 3 VCL-30 iDSL DSLAM

4. Copyright, Valiant Communications Limited 2000-2003 ISP iDSL Application Customer Premises, Option # 1 iDSL Deployment VCL-30 E1 Multiplexer for 15 Subscribers V.35 Desktop Modem V.35 Application @ 128 Kbps, each Cisco Router with E1 Interface E1 Customer # 1 Customer # 15 Internet Small Business LAN SOHO PC V.35 Desktop Modem V.35 @ 128 Kbps upto 5km 0.5 mm Twisted pair iDSL Application with V.35 Modems V.35 @ 128 Kbps SOHO PC V.35 Desktop Modem VCL-30 Multiplexer with iDSL Cards Confidential Slide 4 VCL-30 iDSL DSLAM

5. Copyright, Valiant Communications Limited 2000-2003 Customer Premises Option # 2 - Cisco iDSL Router Cisco 804 iDSL Router Our Central Office / ISP Premises iDSL Modem cards - (part # VCL-30-80) is also compatible with the Cisco 804 iDSL Router and can be used to deliver data @ 64 Kbps / 128 Kbps to the Customer Premises, on 2 wires. The Customer Data Interface is a 10BaseT x 4, on the Cisco 804 iDSL Router. The above solution delivers 64Kbps / 128Kbps, leased line, upto 5 Km from the VCL-30, to the customer premises on iDSL. Terminates on 10BaseT x 4 ports at customer premises. Note: Either customer Premises option # 1, or customer premises option # 2 may be ordered, for use with Central Office / ISP Premises iDSL Modem cards - (part # VCL-30-080) depending on the user requirements. Confidential Slide 5 VCL-30 iDSL DSLAM

6. Copyright, Valiant Communications Limited 2000-2003 ISP iDSL Application iDSL Deployment VCL-30 E1 Multiplexer for 15 Subscribers Cisco 804 - iDSL Router Application 10BaseT Interface Cisco Router with E1 Interface E1 Customer # 1 Customer # 15 Internet Cisco 804 iDSL Router 10 Base T Interface Cisco 804 iDSL Router 10 Base T Interface Cisco 804 iDSL Router 10 Base T Interface Data @ 128 Kbps 0.5 mm Twisted pair iDSL Application with Cisco 804 iDSL Routers Data @ 128 Kbps upto 5km VCL-30 Multiplexer with iDSL Interface Cards Confidential Slide 6 VCL-30 iDSL DSLAM

7. Copyright, Valiant Communications Limited 2000-2003 Technical Specifications E1 Specifications: Line Code : HDB3 Impedance : 120 Ohms, balanced pair Connection: RJ 45 OR Wire-Wrap (Compatible with Cisco Routers - VWIC (Interface Cards) Time Slots used : 1-15, 17-31, Time Slot Selectable. iDSL Specifications Maximum Distance : 5KM (4 miles) on 0.5 mm twisted Pan. Distance may vary with cable gauge For distance using various cable gauges please refer to chart below. Line Coding : (Twisted Pair) 2BIQ Transmission Technique : iDSL (ISDN) Data Rate 64 Kbps / 128 Kbps selectable Lighting Protector : CCITT Table 12/20 Confidential Slide 7 VCL-30 iDSL DSLAM

8. Copyright, Valiant Communications Limited 2000-2003 Confidential Slide 8 VCL Products E1, Voice & Data Drop-Insert Multiplexer PRI ISDN (Q.931) Multiplexers E1 Intelligent Channel Banks E1 / T1 DCME (Digital Circuit Multiplication Equipment) - Voice Compression Equipment Thin Route DCME E1 / T1 Echo Cancellers E1 / T1 Digital Cross Connect T1 / E1 Converters E3, 34Mbps Multiplexer 34Mbps Optical Line Transmission Equipment (OLTE) Digital Loop Carrier Remote Asset Management Systems

9. Copyright, Valiant Communications Limited 2000-2003 Thank you for your attention For more details visit us at our Website at http://www.valiantcom.com 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