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363-131 121-55A 14-.5
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Class Number: 370
Class Title: MULTIPLEX COMMUNICATIONS
Subclass Subclass
Number Title
5 PHANTOM
6 CROSS TALK SUPPRESSION
7 AMPLITUDE COMPRESSION/EXPANSION
8 PULSE WIDTH AND PULSE POSITION MODULATION
9 PULSE WIDTH (PULSE DURATION) MODULATION
10 PULSE POSITION MODULATION
125 SIMULTANEOUS TELEGRAPHY AND TELEPHONY
11 PLURAL DIVERSE MODULATION TECHNIQUES
12 PHASE MODULATION
13 TESTING (OTHER THAN SYNCHRONIZATION)
13.1 .Of repeater
14 .Path check
15 .Loopback
16 .Alternate routing in response to failure
16.1 ..Loop or ring
17 .Determination of communication parameters
18 CODE WORD MULTIPLEX
19 GENERALIZED ORTHOGONAL OR SPECIAL MATHEMATICAL TECHNIQUES
20 .Quadrature carries
21 .Particular set of orthogonal functions
22 ..Walsh functions
23 .Fourier transform
24 DUPLEX
25 .Artificial line
26 .Duplex repeaters/extenders
27 .Differential
28 .Bridge
29 .Time division
30 .Frequency division
31 .Convertible to half duplex
32 .Transmit/receive interaction control
32.1 ..Echo suppression or cancellation
33 SEXTUPLEX
34 QUADRUPLEX
35 .Repeaters
36 .Duplex diplex
37 DIPLEX
38 PLURAL USAGE OF COMMON ANTENNA
39 .Common heterodyne stage
40 .Carrier control to prevent interaction among connected devices
41 LOW SPEED ASYNCHRONOUS DATA SYSTEMS (E.G., TELETYPEWRITER
SERVICE)
42 .Data switching exchanges
43 .Data assembly or formatting
44 .Transmitting time of transition and logic state
45 .Channels separated in frequency
46 .Rotary distributor
47 ..Synchronizers
48 ...Start-Stop
49 ....Nonmechanical
49.5 TRANSMULTIPLEXERS
50 COMBINED TIME DIVISION AND FREQUENCY DIVISIONN
51 RESONANT TRANSFER TECHNIQUES
52 RESONANT TRANSFER SUBSTITUTES
53 MULTIPLEX SWITCHING
54 .Pathfinding
55 .Drop channel
56 .Concentrators
57 .FDM Switching (Frequency Division Multiplexing)
58.1 .TDM switching (time division multiplex)
58.2 ..Control processing
58.3 ...Distributed
59 ..T-S (Time-Space) or S-T
60 ..Packet or addressed data
60.1 ...Combined with circuit switching
61 ..Store and forward
62 ..Special services with switching (e.g., conference)
63 ..TST (Time-Space-Time)
64 ..STS (Space-Time-Space)
65 ..Folded network
65.5 ..Space stage per se
66 ..Time only
67 ...Bus switch
68 ..Time slot interchangers per se
68.1 ..With signalling feature
69.1 FREQUENCY DIVISION
120 .Multiple frequency translations
121 .Carrier generation
122 .Angle modulation
123 .Filtering techniques
70 .Digital analysis or synthesis of group
71 .Subscriber carrier
72 ..Connecting filters
73 ..Program distribution
124 .Bus (distributed stations)
74 .Pilot
75 .Repeaters
76 .Signalling
77 TIME DIVISION
78 .Polarity multiplex
79 .Adaptive systems
80 ..Only active channels transmitted
81 ...TASI (Time assigned speech interpolation)
82 ..Frame length
83 ..Byte length
84 ..Rate
85.1 .Bus transmission
85.2 ..Contention
85.3 ...Carrier sense
85.4 ...Token passing
85.5 ....Loop or ring
85.6 ..Priority
85.7 ..Variable channel assignment
85.8 ...Polling
85.9 ..Plural bus
85.11 ...With separate control bus
85.12 ...Loop or ring
85.13 ...Bridge between bus systems
85.14 ....Interconnection between ring or loop
85.15 ..Loop or ringg
91 .Asynchronous and nonsynchronous
92 ..Address transmitted
93 ...Multiple access, discrete address
94.1 ...Packet
94.2 ....Combined with synchronous information
94.3 ....Star, tree or mesh networks
95.1 .Variable channel assignment
95.2 ..Polling
95.3 ..Time division multiple access
97 .TDM pulse repeater
98 .Pilot
99 .Byte assembly and formatting
100.1 .Synchronizing
101 ..Reference indication consists of a gap
102 ..Pulse stuffing or deletion
103 ..Mutual (reciprocal) synchronization
104.1 ..Moving satellite
105 ..Distributed
105.1 ..Frame
105.2 ..Channel
105.3 ..Bit phase or jitter
105.4 ..Unique synchronization word
105.5 ..Unique synchronization pulse
106 ..Plural synchronizing words
107 ..Pseudo-random
108 ..Including delay device
109 .Time compression or expansion
110.1 .Signalling (ancillary to main information)
110.2 ..Digital tone signal generation
110.3 ..Digital tone detection
110.4 ..Superimposed or modulated on principal information
111 ..Inserted in gaps in main information
112 .Multiplexers/distributors (hierarchy and level)
113 ..Apparatus and techniques for handling low level input signals
114 ..Pulse amplitude modulation
115 ..Electron beam switching device
116 .Staircase wave
117 .Magnetic core for switching or storage
118 TRANSMISSION BANDWIDTH CONSERVATION
119 MISCELLANEOUS