Subsurface & Tunnel Engineering LLC

Located in Gaithersburg, Md., and also known as SCG, The Scientific Consulting Group provides professional consulting services to government and private clients. It offers data collection, analysis and strategic planning services. The company uses various methods and approaches to collect primary and secondary data. It assists clients in designing survey instruments, tracking responses and conducting follow-ups. The Scientific Consulting Group offers a range of publication preparation services, including technical writing, editing, proofreading, production, and layout and graphic design. It employs a staff of scientists and technicians who conduct research and write scientific publications. The company s staff prepares a variety of reports, books, manuscripts, journal articles, monograms and research papers.

Founded in 1986, GL Communications Inc. is a provider of PC-based test, analysis and simulation products and consulting services to the telecommunications industry. The company is a supplier of monitoring and analysis equipment for TDM, Wireless, IP and Voice Over Internet Protocol (VoIP) networks. Its line of products includes T1, E1, T3, E3, OC-3, STM-1, analog four-wire and analog two-wire interface cards, external portable pods and complete system solutions. GL Communications Inc. s capabilities include voiceband traffic analysis and emulation across all traffic types (voice, digits, tones, fax and modem), all protocols (ISDN, SS7, GR-303, Frame Relay, HDLC, V5.X, ATM, GSM, GPRS, etc.) and with capacities up to thousands of channels.