Page 316 - Optical Switching And Networking Handbook

14_200023_Index 1/17/01 10:09 AM Page 301

Index 301

T U–V

TDM (Time-Division Multiplexing), 6 UNI (User to Network Interface), SDH, 89
fiberoptics usage example, 21 upgrades, advantages of using DWDM,
limitations, 106 232–233
Telephony over the Internet, 242 VCs (Virtual Containers), SDH, 90
tensile strength, fiberoptics, 49 multiplexing, 94
throughput, SDH, 87 nesting, 97
TIA (Telecommunications Industry pointers, 96
VDSL (Very-high-bit-rate Digital Subscriber
Association), wire specifications, 31
Line), 16
timeline for fiber-based systems, 10
vendors
timing sources, asynchronous
ITU-compliant DWDM vendors, 171
transmission, 58
SDH systems, 156
tolerances, DWDM wavelengths, 119
SONET systems, 156
topologies
WDM systems, 156
high-speed applications, 190
Video over IP, 242
SONET, 76, 190
VoIP (Voice over IP), 242
total internal reflection, 9, 14, 39
VT 1.5 signals, SONET, 70–71
transatlantic fiberoptic cabling, 12
VTs (Virtual Tributaries), SONET, 70
transmission
asynchronous, 58
bandwidth. See bandwidth. W–Z
frequencies, 34
impairments, 35 WANs (Wide Area Networks)
plesiochronous, 61 high-speed applications, SONET/SDH, 211
rates, SDH, 87 optical switching, DWDM, 128
standards, 54 SONET, add-drop multiplexing, 75
See also signal transmission. water, fiberoptic damage, 50
transmitters, 6, 37 waveguide dispersion, 11, 36
transparent optical networks wavelengths, 111
advantages, 222 DWDM, 116
costs, 224 bandwidth capacity, 112
transparent optical switching, 127–128 tolerances, 119
frequency windows, 37
transport modes, SDH, 90
switching, 251
transport overhead, SONET, 64
WDM (Wavelength-Division Multiplexing),
TUs (Tributary Units), SDH, 91
7, 25, 106, 114, 129
types of fiberoptics, 37
advantages to existing infrastructure, 157
bandwidth, 111–112