websters new world Telecom Dictionary phần 1 potx

[...]... uncertain As a result, 802 .11 never gained any real traction in the market Soon afterward, however, much improved extensions to 802 .11 were finalized, and WLANs quickly gained in popularity Current extensions include 802 .11 a, 802 .11 b, and 802 .11 g Still under development is 802 .11 n See also 802 .11 a, 802 .11 b, 802 .11 g, 802 .11 n, CSMA/CA, Ethernet, IEEE, ISM, RF, Wi-Fi, Wi-Fi5, and WLAN 802 .11 a Also known as Wi-Fi5... table 10 Gigabit Ethernet (IEEE 802.3ae) Media Specifications Wavelength Modal Bandwidth (MHz/km) Distance (Maximum) 16 0 300 m Standard Fiber Type Core Diameter 10 GBase-SR, SW MMF 62.5µ 10 GBase-LR, LW SMF 8.3µ, 9µ, 10 µ 13 10 nm Not Applicable 10 km 10 GBase-ER, EW SMF 8.3µ, 9µ, 10 µ 15 50 nm Not Applicable 40 km 10 GBase-LX4 MMF 50µ, 62.5µ 13 10 nm 500 10 GBase-LX4 SMF 10 µ 13 10 nm Not Applicable 850 nm 300 m 10 ... book and intend for each to be bigger and better Ray Horak 15 00A East College Way, PMB 443 Mount Vernon,WA 98273 United States of America ray@contextcorporation.com Tel: 360.428.5747 Fax: 360. 416 .3378 74570flast.qxd 9 /11 /07 12 :17 PM Page xix TM Telecom Dictionary 74570flast.qxd 9 /11 /07 12 :17 PM Page xx 74570cintro.qxd 9 /11 /07 12 :17 PM Page 1 Symbols # Octothorp, octothorpe, pound sign, hash mark, or... line (HDSL) 2B1Q also is known as 4-level pulse amplitude modulation (4 PAM) In European and many other countries, the line coding technique employed is 4 Binary 3 Ternary (4B3T) See also 4B3T, baud rate, bit rate, BRI, echo cancellation, HDSL, ISDN, and PAM 0 1 0 0 1 1 1 0 Baseband Digital Signal 0 1 0 0 1 1 1 0 +3V +1V 0V -1V -3V 2B1Q Line Coding 2 Binary 1 Quaternary (2B1Q) See 2B1Q 23B+D Synonymous... phase-shift keying (BPSK) at 12 5 kbps per channel for a total of 6 Mbps (12 5 kbps × 48 channels = 6 Mbps), and 18 7.5 kbps for a total of 9 Mbps • Quadrature phase-shift keying (QPSK) at 250 kbps per channel for a total of 12 Mbps, and 375 kbps per channel for a total of 18 Mbps 74570cintro.qxd 9 /11 /07 12 :17 PM Page 13 13 802 .11 e • 16 -level quadrature amplitude modulation (16 -QAM) at 500 kbps per channel... 9 /11 /07 12 :14 PM Page xii 74570ftoc.qxd 9 /11 /07 12 :16 PM Page xiii CONTENTS Acknowledgments xv Introduction xvii Telecom Dictionary A–Z 1 560 Appendix A: Standards Organizations and Special Interest Groups (SIGs) 5 61 74570flast.qxd 9 /11 /07... Fiber Type Core Diameter 10 00Base-SX MMF 62.5 µ 10 00Base-SX MMF 10 00Base-SX Wavelength Modal Bandwidth (MHz/km) Distance (Maximum) 850 nm 16 0 220 m 62.5 µ 850 nm 200 275 m MMF 50.0 µ 850 nm 400 500 m 10 00Base-SX MMF 50.0 µ 850 nm 500 550 m 10 00Base-LX MMF 62.5 µ 13 00 nm 500 550 m 10 00Base-LX MMF 50.0 µ 13 00 nm 400 550 m 10 00Base-LX MMF 50.0 µ 13 00 nm 500 550 m 10 00Base-LX SMF 9µ 13 10 nm Not Applicable... rate 10 GbE (10 Gbps Ethernet) See 10 Gigabit Ethernet 74570cintro.qxd 9 /11 /07 12 :17 PM Page 5 5 10 0Base-T4 10 Gigabit Ethernet (10 GbE) Standardized by the IEEE as 802.3ae, 10 GbE uses the same frame format and medium access control (MAC) layer as predecessor Ethernets 10 GbE runs only in full-duplex (FDX) mode, which makes collision control unnecessary.The primary line coding technique used in both 10 GbE... 802 took its name from the fact that it was established in the year 19 80, and the month 2, i.e., February.) See also, CSMA, Ethernet, IEEE, LAN, MAC, and standard 74570cintro.qxd 9 /11 /07 12 :17 PM Page 11 11 802.4 802.3ab The IEEE standard for 10 00Base-T See 10 00Base-T 802.3ae The IEEE media specifications for 10 Gigabit Ethernet (10 GigE) Those specifications address both multimode (MMF) and single-mode... including 10 GBase-SR, SW; 10 GBase-LR, LW; 10 GBase-ER, EW; and 10 GBase-LX4 10 GbE has application in the backbones of very bandwidth intensive local area networks (LANs) and metropolitan area networks (MANs) See also 10 GBase-CX4; 10 GBase-SR, SW; 10 GBase-LR, LW; 10 GBase-ER, EW; 10 GBase-LX4; 64B/66B; 802.3ae; 8B /10 B; Cat 6; Cat 7; IEEE; LAN, line coding; MAC; MAN; overhead; and signaling rate 10 GigE (10 Gbps . alt="" Telecom Dictionary Ray Horak TM Wiley Publishing, Inc. 74570ffirs.qxd 9 /11 /07 12 :14 PM Page iii 74570ffirs.qxd 9 /11 /07 12 :14 PM Page ii Telecom Dictionary TM 74570ffirs.qxd 9 /11 /07 12 :14 . Page i 74570ffirs.qxd 9 /11 /07 12 :14 PM Page ii Telecom Dictionary Ray Horak TM Wiley Publishing, Inc. 74570ffirs.qxd 9 /11 /07 12 :14 PM Page iii Webster’s New World Telecom Dictionary Published. electronic books. 74570ffirs.qxd 9 /11 /07 12 :14 PM Page iv To Margaret for whom my love is infinite and eternal 74570ffirs.qxd 9 /11 /07 12 :14 PM Page v 74570ffirs.qxd 9 /11 /07 12 :14 PM Page vi ABOUT THE AUTHOR R ay