INDEX

AA indicator 424

Abort 334

Access control 337–8

Access lists 794–8

Access servers 618–20

overview 618

utilization 619–20

ACCUNET Spectrum of Digital Service (ASDS) 18–20, 37

Acknowledged connectionless service 327

Acknowledgement (ACK) character 123

Acoustic couplers 8–9, 351–5

operation 354

problems in usage 354–5

US and Europe an compatibility 352–3

Active monitor 338

Activity map 644

Adaptive differential PCM(ADPCM) 660

Address and byte count (ABC) frame composition 644

Address Resolution Protocol (ARP) 208, 569

Adjusted ring length (ARL) 332

Advanced Peer-to-Peer Communications (APPC) 243

Advanced Peer-to-Peer Networking (APPN) 235, 246–50

architecture 247

concepts 246–7

general structure 251

operation 248–9

route selection 250–1

Advanced Program-to-Program Communication (APPC) 246–7

Advanced Research Projects Agency (ARPA) 69

Alerts 805–6

Alignment signal 525

Alternate mark inversion (AMI) 17, 506, 526

American National Standards Institute (ANSI) 55, 59–61

Amplifiers 358

Amplitude modulation (AM) 363–4

Amplitude modulation phase shift keying (AM PSK) 278

Analog facilities 9–14

Analog loopback (AL) indicator 426

Analog service, transmission rate 36–7

Application layer 74

ARPANet 69

ASCII 42–3, 45–7, 49, 50, 52, 53, 95, 121, 748, 749, 762, 763

Asymmetric Digital Subscriber Line (ADSL) 490–1, 501–4

Asymmetrical modems 419–20

Asynchronous operations, DTE-DCE interface 82

Asynchronous Transfer Mode (ATM) 251

Adaptation Layer (AAL) 253–4, 255–6

benefits 252–4

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