websters new world telecom dictionary phần 8 potx

... over 1–4 four-wire (i.e., 4 two-pair) circuits, which results in a savings of at least 88 pairs (96 – 8 = 88 ) from the CO to the node. Note: For fewer than 4 T1s, not all subscriber lines can be ... Texas) Pacific Bell (California) Nevada Bell (Nevada) New England Telephone (Massachusetts, Maine, New Hampshire, Rhode Island, and Vermont) New York Telephone (New York) Bell Operatin...

Ngày tải lên: 14/08/2014, 09:20

... Fibre Channel, GigE, ones density, and line coding. 8- level vestigial sideband (8- VSB) See 8- VSB. 8- Phase Shift Keying (8- PSK) See 8- PSK. 8- PSK (8- Phase Shift Keying) A signal modulation technique ... was 80 0.As the service gained in popularity during the 1990s,the numbering scheme was expanded to include 86 6, 87 7, and 88 8 area codes. See also area code and toll free serv...

Ngày tải lên: 14/08/2014, 09:20

... EIA/TIA-5 68, ICEA, IEC, ISO, ISO/IEC 1 180 1, TIA, and twist pitch. Carterfone Decision 84 74570c03.qxd 9/11/07 12:19 PM Page 84 Figure A-7 AT&T (American Telephone and Telegraph) On July 9, 187 7, ... and z-axis. Carty, John Joseph ( 186 1–1932) As a young American Bell technician and one of the original tele- phone operators ( 187 9), Mr. Carty suggested in 188 1 the use of a secon...

Ngày tải lên: 14/08/2014, 09:20

... 1.544 30 2.0 48 1C 48 3.152 2 96 6.312 6.312 120 8. 4 48 7. 786 3 480 34.3 68 32.064 672 44.736 3C 1,344 91.053 4 1,440 97.7 28 1,920 139.2 68 4,032 274.176 5 5,760 400.352 7, 680 565.1 48 565.1 48 6 30,720 ... over a much wider band. DSSS is used in the 80 2.11b (Wi-Fi) and 80 2.11g specifications for wireless local area networks (WLANs). See also 80 2.11b, 80 2.11g, band, carr...

Ngày tải lên: 14/08/2014, 09:20

... E-1s E-1 2.0 48 30 1 E-2 8. 4 48 120 4 E-3 34.3 68 480 16 E-4 139.2 68 1920 64 E-5 565.1 48 7 680 256 EBCDIC (Extended Binary Coded Decimal Interchange Code) 1 58 74570c05.qxd 9/11/07 12:20 PM Page 1 58 f1.Symbol ... functional and practical electric telegraph ( 184 4), invented by Samuel F.B. Morse (1791– 187 2) and Alfred Vail ( 180 7– 185 9). Fax development began anew in the 1920s...

Ngày tải lên: 14/08/2014, 09:20

... transport subsystem as ISO/IEC 1 381 8. Packet transport involves a serial data stream of packets of 188 octets, one octet of which is a synchronization byte and 187 octets of which are payload.This ... slots, each of which is 8 bits wide.At a rate of 8, 000 fps, each time slot is repeated 8, 000 times per second, which translates into a DS-O channel at 64 kbps (8 bits × 8, 000 per seco...

Ngày tải lên: 14/08/2014, 09:20

... network, as illustrated in Figure M-1, requires 28 circuits, each of which requires two ports, calculated as follows: X = n(n – 1) / 2 28 = 8( 8 – 1) / 2 The cost and complexity of full mesh networks ... Standard (IS 1 381 8) for digital television (DTV). MPEG-2 was conceived as an encoding and compression standard for broadcast television based on interlaced scanning of images at 720 × 4...

Ngày tải lên: 14/08/2014, 09:20

... Rate OC/STM Level Line Rate OTU-1 2.666 Gbps OC- 48/ STM-16 2. 488 Gbps OTU-2 10.709 Gbps OC-192/STM-64 9.953 Gbps OTU-3 43.0 18 Gbps OC-7 68/ STM-256 39 .81 3 Gbps G.709 also specifies an interface for ... engineering. Poisson, Siméon-Denis (1 781 – 184 0) The French mathematician and physicist who discovered the Poisson distribution, which he published together with his probability theory...

Ngày tải lên: 14/08/2014, 09:20

... rate of 8, 000 fps, each time slot is repeated 8, 000 times per second, which translates into a DS-O channel at 64 kbps (8 bits × 8, 000 per second = 64,000 bps).Taken together, the 24 8- bit TDM ... operator must listen to decode the transmission. Note: In 183 8, Samuel Morse offered to give his invention of the telegraph to the newly formed ( 183 6) Republic of Texas. After having rece...

Ngày tải lên: 14/08/2014, 09:20

... 202.775.3550 www.ncta.com NECA National Exchange Carrier Association 80 South Jefferson Road Whippany, NJ 07 981 -1009 Tel: 973 .88 4 .80 00, or 80 0.2 28. 8597 Fax: 973 .88 4 .84 69 www.neca.org NTIS National Technical Information ... NARTE National Association of Radio and Telecommunications Engineers 167 Village Street Medway, MA 02053 Tel: 5 08. 533 .83 33 or 80 0 .89 6.2 783 Fax: 5...

Ngày tải lên: 14/08/2014, 09:20