s and take action to ensure the growth of wireless broadband services. Spectrum policy-Efforts need to be coordinated across regions and ulti- mately globally to ensure availability and flexible usage. The many challenges ahead need to be addressed by supporting targeted R&D, supplementing basic research, and accelerating technical innovation. This page intentionally left blank Glossary Numerals 1G (first-generation) wireless The first generation of wireless communication, which is characterized by analog transmission systems. Key 1G standards included AMPS, TACS, JTACS, and NMT. 10BASE2 Thin coax Ethernet cable. 10BASE5 Thick coax Ethernet cable. 10BASE-FL Two strands of multimode optical fiber Ethernet cable. 10BASE-T 2-pair UTP Ethernet cable. 10GigE (10 Gigabit Ethernet) An Ethernet standard that supports a data rate of 10Gbps. Sometimes referred to as 10Gbps Ethernet. 100BASE-FX Two strands of multimode optical fiber Fast Ethernet cable. 100BASE-T2 2-pair Cat 3 UTP Fast Ethernet cable. 100BASE-T4 4-pair Cat 3 UTP Fast Ethernet cable. 100BASE-TX 2-pair Cat 5 UTP Fast Ethernet cable. 1000BASE-CX Coax patch cable/Gigabit Ethernet cable. 1000BASE-LX Long-wavelength single-mode optical fiber Gigabit Ethernet cable. 1000BASE-SX Short-wavelength multimode optical fiber Gigabit Ethernet cable. 1000BASE-T 4-pair Cat 5 or Cat 5e UTP Gigabit Ethernet cable. Glossary 1000BASE-TX 1000BASE-TX 2-pair Cat 6 (currently a TIA draft proposal) Gigabit Ethernet cable. 2B1Q (2 Binary 1 Quaternary) A single-carrier modulation scheme that provides for 2 bits/Hz and is used in ISDN, HDSL, and IDSL. 2G (second-generation) wireless The second generation of wireless communication, which introduced digital transmission and includes digital cellular and PCS systems, such as TDMA (ANSI-136), GSM, and IS-95. 2.5G (2.5-generation) wireless The generation of wireless communication between 2G and 3G, which offers enhancements to the data services on existing second-generation digital platforms. 2.5G can support faster data rates, ranging from