Data Communications Networking Devices - 4th Ed.pdf

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xviii ______________________________________________________________________ CONTENTS6.2 T1/E1 Multiplexers 651The T-carrier 652PCM 652Sampling 652Quantization 653Coding 654DS1 framing 654Digital signal levels 655Framing changes 656T1 signal characteristics 657European E1 facilities 657The T1 multiplexer 658Voice digitization techniques 659Waveform coding 659Vocoding 661Linear predictive coding 661Hybrid coding 663CELP coding 663T1 multiplexer employment 664Features to consider 665Bandwidth utilization 666Bandwidth allocation 667Voice interface support 669Voice digitization support 670Internodal trunk support 671Subrate channel utilization 671Digital access cross-connect capability 673Gateway operation support 673Alternate routing and route generation 674Redundancy 675Maximum number of hops and nodes supported 676Diagnostics 676Con®guration rules 6766.3 Subrate Voice/Data Multiplexers 677Operation 677Utilization 6786.4 Inverse Multiplexers 679Operation 679Typical applications 680Contingency operations 682Economics of use 683Extended subchannel support 683Bandwidth-on-demand 6856.5 Packet Assembler/Disassembler 686Applications 687Types of PADs 687X.3 parameters 6886.6 Frame Relay Access Device 692Hardware overview 692Comparison to routers 693The I-FRAD 693Protocol support 694SNA/SDLC encapsulation into TCP/IP 694SNA/SDLC conversion to SNA/LLC2 694Data Link Switching 695RFC 1490 695Voice over Frame Relay 696Fragmentation 696Prioritization 696
CONTENTS ______________________________________________________________________ xixBuffering 696Voice digitization 6976.7Front-end Processors 697Communications controllers 699IBM 3725 700IBM 3745 702IBM 3746 7056.8 Modem- and Line-sharing Units 706A similar device 707Operation 707Device differences 708Sharing unit constraints 709Other sharing devices 7106.9 Port-sharing Units 711When to consider 711Operation and usage 713Port-sharing as a supplement 715A similar device 7156.10 Control Units 716Control unit concept 716Attachment methods 717Unit operation 718Protocol support 719Breaking the closed system 720Protocol converters 720Terminal interface unit 7216.11 Port Selectors 722Types of devices 722Operation 723Computer site operations 723Usage decisions 724Port costs 727Load balancing 728Selector features 728Line-switching network 7296.12 Protocol Converters 730Operation 731Physical/electrical conversion 731Data code/speed conversion 731Conversion categories 731Device operation conversion 732Device functionality conversion 732Character versus block mode operation 733Applications 734Review Questions 7357. Specialized Devices 7417.1 Data Communications Switches 741Fallback switches 742Bypass switches 743Crossover switch 744Matrix switch 744Additional derivations 746Chaining switches 747Switch control 748
Page 3 and 4: Copyright # 1986, 1989, 1992, 1999
Page 5 and 6: CONTENTSPrefaceAcknowledgementsxxii
Page 7 and 8: CONTENTS __________________________
Page 15: CONTENTS __________________________
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Page 23 and 24: Data Communications Networking Devi
Page 25 and 26: 1.2 LINE CONNECTIONS ______________
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1.12 ERROR DETECTION AND CORRECTION
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1.13 STANDARDS ORGANIZATIONS, ACTIV
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1.16 INTEGRATED SERVICES DIGITAL NE
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Data Communications Networking Devi
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4.6 SECURITY MODEMS _______________
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4.9 BROADBAND MODEMS ______________
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4.10 DIGITAL SERVICE UNITS ________
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4.11 CHANNEL SERVICE UNITS ________
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Data Communications Networking Devi
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