... free-running, with some running at a slightly faster or slower pace. 377 plesiochronous 74 570 c16.qxd 9/11/ 07 12: 27 PM Page 377 PM 1. Phase Modulation. More commonly known as phase-shift keying ... topology, partial mesh, physical, ring, star, topol-ogy, tree, and WAN.photon 374 74 570 c16.qxd 9/11/ 07 12: 27 PM Page 374 plain text Data comprising standard characters (e.g., letters, numbers, and ... resistance, and voltage.3 47 Ohm’s Law 74 570 c15.qxd 9/11/ 07 12:26 PM Page 3 47 Research Project Agency (ARPA) and the National Science Foundation (NSF). Previously (19 87) , a con-sortium of European...