1. Slide 1 Comarra Limited - 2006Slide 1 VCL - MegaConnect - Jr., T1 DACS Slide 1Comarra Limited - 2006Slide 1 COMARRA Telecom Transmission Solutions 16 Port, T1 Digital Access Cross Connect Switch VCL MegaConnect - Jr. T1 DACS Updated : March 2006 VCL - MegaConnect - Jr., T1 DACS

2. Slide 2 Comarra Limited - 2006Slide 2 VCL - MegaConnect - Jr., T1 DACS 16 Ports, T1 Digital Access Cross Connect Switch. Offers full cross-connect functionality to cross-connect, and / or aggregate DS-0s, "n"x64Kbps consecutive data channels and, fractional T1 channels to full T1 channels. Uni-directional Monitoring. Bi-directional Monitoring. Non - Intrusive Monitoring Application / Combine traffic from partially - utilized facilities onto a single fully - utilized T1. Occupies only a 2U high rack-space. 19-inch stand-alone unit provides connectivity of up to 16 T1 ports. Units operates on a 48VDC input power-supply (AC input adapter is optional). T1 Digital Access Cross Connect Switch Product Overview

3. Slide 3 Comarra Limited - 2006Slide 3 VCL - MegaConnect - Jr., T1 DACS ISP - Providing Fractional T1s to Subscribers. Data - Aggregating Fractional T1 Data Circuits. Monitoring & Billing - Non-Intrusive Line Traffic Monitoring for “Listen-Only” and Billing Applications. Cellular - Extending Fractional T1 ports from MTSO to Cell-Sites. Applications

4. Slide 4 Comarra Limited - 2006Slide 4 VCL - MegaConnect - Jr., T1 DACS Remote TCP / IP Access for configuration and Monitoring. Text based user friendly CLI for easy configuration. Telnet option. Available in 16 T1 ports configuration. Highlights

5. Slide 5 Comarra Limited - 2006Slide 5 VCL - MegaConnect - Jr., T1 DACS Provides DS0, "n"x64Kbps and Fractional T1 grooming for up to 16 T1 ports. Rear Access. User friendly CLI (text based) commands. Telnet (10 / 100BaseT) option. Easy to install. Configurable from 2, T1 ports to 16, T1 ports depending on user requirements. LED Indications on the front panel for alarms and status. Features

6. Slide 6 Comarra Limited - 2006Slide 6 VCL - MegaConnect - Jr., T1 DACS Reduce access costs by combining partially loaded T1s to a single T1. Rear access wiring. Improves wiring and cable management. Support Nx64kbps fractional T1 operation and grooming. Can be ordered for (non - Intrusive) connecting to monitoring / billing equipment for Live - Traffic monitoring and cross connect functions. Easy to install and simple to use. Benefits

7. Slide 7 Comarra Limited - 2006Slide 7 VCL - MegaConnect - Jr., T1 DACS Applications

8. Slide 8 Comarra Limited - 2006Slide 8 VCL - MegaConnect - Jr., T1 DACS Applications

9. Slide 9 Comarra Limited - 2006Slide 9 VCL - MegaConnect - Jr., T1 DACS To monitor an T1 link in a single direction, you will need to connect ONE high impedence T1, RX pair of the DACS, as it is only the Rx (RECEIVE) pair that is capable of listening. Please leave the Tx (TRANSMIT) pair un-connected. Applications

10. Slide 10 Comarra Limited - 2006Slide 10 VCL - MegaConnect - Jr., T1 DACS To monitor an T1 link in both directions, you will need to connect TWO high impedence T1, RX pairs of the DACS, i.e. use 1, Hi-Z T1 ports. A Total of 7 T1 links can be monitored bi-directionally aggregated to 2 T1’s. Applications

11. Slide 11 Comarra Limited - 2006Slide 11 VCL - MegaConnect - Jr., T1 DACS The VCL-DACS, T1- Digital Cross Connect Switch unit is a 2U, 19 Inch Shelf, fitted with a backplane that provides rear access of all external interfaces. The 1.544Mbps electrical I/O, power input, alarm extension and the NMS port are all accessed from the backplane. The 1.544Mbps, T1 Interfaces are, 100 Ohms twisted pair RJ-45 connectors. VCL-DACS, T1 Digital Cross Connect Switch - Shelf Description

12. Slide 12 Comarra Limited - 2006Slide 12 VCL - MegaConnect - Jr., T1 DACS T1 Interface Line RateT1 (1.544 Mbps ± 50 bps) Available Time-Slots1-24 Framing StructureAs per ITU-(CCITT) G.704 Framing OptionsD4, ESF (Selectable) Line CodingAMI, B8ZS (Selectable) Electrical ITU-T G.703 Jitter ITU-T G.823, ITU-T 1.431 Impedance 100 Ohm Connector RJ-45 (F) Time - slot selection: ANY-TO-ANY through an internal, best byte, non-blocking TSI Switch. Clock : Internal(Stratum3 level) Loop-Timed External75 Ohms - 2.048 Mhz - 1.544 Mhz Technical Specifications

13. Slide 13 Comarra Limited - 2006Slide 13 VCL - MegaConnect - Jr., T1 DACS Management and Control: Serial Management Port (RS232) - COM Port. 10 / 100 BaseT for Remote Management over a LAN. 10 / 100 BaseT Telnet over a TCP-IP Network. Command Language: Command Line Interface (English text commands). Windows based GUI (optional). Specification and Regulation Compliance Meets CE requirements. Complies with FCC, Part 68 and Part 15 subpart A specifications. Safety - UL 1459 Issue 2. Technical Specifications

14. Slide 14 Comarra Limited - 2006Slide 14 VCL - MegaConnect - Jr., T1 DACS Alarm Contact Closures 1 Alarm Relay, Type - Form "C" relay, Temperature Operating0 0 C to 50 0 C Humidity 5% to 95% Non-Condensing Power Consumption Power Consumption18 Watt Mechanical Specification Width:480mm Depth:280mm Height:90mm Weight:4.20 Kg. Technical Specifications

15. Slide 15 Comarra Limited - 2006Slide 15 VCL - MegaConnect - Jr., T1 DACS Alarm Status Monitoring Loss of incoming Signal at all 1.5Mbps ports Configuration Error Alarm In addition to the above monitoring facilities, VCL-DACS is provided with LED's, which indicate various fault conditions Monitoring VCL-DACS via LED Indications 1 to 16 T1 Ports LED indicators +3 VDC present -48VDC present Configuration Error Technical Specifications

16. Slide 16 Comarra Limited - 2006Slide 16 VCL - MegaConnect - Jr., T1 DACS Digital Access Cross Connects - E1 / T1, E3, DS3, 10/100 BaseT Ethernet Groomers (Hi-Z Non-intrusive Hi-Impedance Monitoring) Echo Canceller & Voice Quality Enhancement Solutions - E1, T1, DS3 and STM-1 E1 Drop-Insert (Add-Drop) Voice and Data Multiplexers 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 VoIP SS7 and C7 Solutions Nextone Softwitch CISCO Gateways Quintum Tenor VOIP Gateways Networking & Engineering Solutions. Hosted Solutions. Comarra’s Products

17. Slide 17 Comarra Limited - 2006Slide 17 VCL - MegaConnect - Jr., T1 DACS Thank you for your attention For more details visit us at our Website at http://www.comarra.co.uk 123 Springvale Road, Winchester Hants SO23 7LE UK Phone: +44 (0) 20 7871 9524 E-mail: info@comarra.co.uk Web Site: http://www.comarra.co.ukinfo@comarra.co.ukhttp://www.comarra.co.uk