1、 ANSI/TIA-596-1992 APPROVED: OCTOBER 28, 1992 REAFFIRMED: OCTOBER 26, 2002 REAFFIRMED: OCTOBER 26, 2011 WITHDRAWN: JULY 24, 2015 TIA-596 October 1992Network Channel Terminating Equipment for Public Switched Digital NOTICE TIA Engineering Standards and Publications are designed to serve the public in
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20、 SECTION EIA TIA-596 93 m 3234600 0503959 b5L m TIA/EIA-596 Network Channel Terminating Equipment for Public Switched Digital Service TABLE OF CON!CENTS PAGE 1. INTRODUCTION . . 1 2. SCOPE . 3 3. DEFINITIONS AND ACRONYMS 4 3.1 Definitions of Terms . 4 3.2 Acronyms . 5 4. INTERWORKING. . . . 6 4.1 Ne
21、twork Considerations 6 4.2.1 Type I Technology 6 4.2.2 Type II Technology . 6 4.2.3 Type III Technology . 6 4.2 Major Differences in Technology . 6 4.3 Service Compatibility 7 4.3.1 Serving Area 7 4.3.2 Protocol Compatibility . 7 4.3.3 PSDS Compatibility Requirement . 7 4.4 Operation in Networks wit
22、h Echo Control Devices . 7 5. TYPE I SCDSU INTERFACE REQUIREMENTS - NETWORK SIDE 9 5.1 Interface Overview 9 5.1.1 Interface Functions . 9 5.2 Electrical Connection and Transceiver Requirements . 10 5.2.1 Overview . 10 5.2.2 Transmitted Pulse Shaping Requirements 10 . 5.2.3 Line Receiver Design 13 5.
23、2.4 Electrical Requirements 14 5.2.5 Line Coding Requirements 15 5.2.6 Timing and Jitter 17 5.2.7 Physical Interface 18 5.3 User/Network Signaling 18 5.3.1 Signaling Representation 18 . . . . 5.3.2 Call Setup Sequence 19 5.3.3 Timing and Tolerances . 20 5.4.2 Mandatory Channel Loopback 23 . . 5.4 In
24、terface Maintenance 23 5.4.1 Channel Loopback 23 5.4.3 Optional Channel Loopback 23 5.4.4 User Initiated Maintenance - Remote Digital Loopback 23 6. TYPE II SCDSU INTERFACE REQUIREMENTS - NETWORK SIDE . 25 6.1.1 Interface Description 25 . 6.1 Interface Overview . 25 6.1.2 Interface Signals 25 . i _
25、- EIA TIA-596 93 m 3234600 0503960 373 = TIA/EIA-596 6.1.3 Interface Modes 6.1,4 The Analog Mode 6.1.5 The Data Mode . 6.2 Electrical Connection and Transceiver Requirements . 6.2.1 Overview . 6.2.2 Transmitter and Line Interface 6.2.3 TCM Receiver Requirements . 6.2.4 Data and Control Sequences For
26、mat . 6.2.5 Burst Specifications . 6.2.6 Physical Interface 6.3 CI and Network Signaling 6.3.1 Far-End Data Tone . 6.3.2 Control Bytes . 6.3.3 Direct Current Electrical Characteristics . 6.3.4 Interface Mode Changes 6.3.5 Minimum Mode Transition Times . 6.4 Interface Maintenance . 6.4.1 Testing Mode
27、s . 25 26 26 26 26 27 31 33 35 43 44 44 44 45 46 50 51 51 57 7. TYPE III SCDSU INTERFACE REQUIREMENTS NETWORK SIDE . 57 57 7.1.1 Line Rate/Format . 58 58 7.1.3 Power Requirements 58 7.1.4 Sealing Current 58 7.2 Electrical Connection and Transceiver Requirements . 58 7.2.1 DC Characteristics 58 7.2.2
28、 AC Characteristics 58 7.2.3 Transmitter Characteristics 59 7.2.4 Scrambler Characteristics . 61 7.2.5 Synchronization 63 7.2.6 Logical Characteristics 64 7.2.7 Receiver Characteristics . 65 7.2.8 Transmission Limitations . 65 7.2.9 Physical Interface 66 7.3 SCDSU/Network Signaling . 66 7.3.1 Protoc
29、ol Overview 66 7.3.2 Data Link Level Protocol . 72 7 . 3.3 Network Layer Protocol (SCDSU/DLC) 96 7.3.4 Data Formats on 64 kb/s Channel . 96 . 96 7.4.1 General. 96 7.4.2 User Initiated Tests . 7.4.3 User Initiated Maintenance - Remote Digital Loopback 97 7.1 Interface Overview 7.1.2 Timing 7.4 Interf
30、ace Maintenance 8. DATA TERMINAL EQUIPMENT INTERFACE (DTE) . 98 98 98 98 98 98 98 8.1 Interface Requirements . Interface 8.2.1 Electrical Characteristics 8.2.2 Clock Rate 8.2.3 Synchronous Operation . 8.2.4 Functional Characteristics 8.2 Technical Description of the V.35/1SO 2593-type DTE-to-SCDSU i
31、i EIA TIA-596 93 3234600 0503963 20T 9 TIA/EIA-596 8.2.5 Mechanical Characteristics 104 8.3 Summary of Customer Interface Behavior . 105 8.4 Transfer of Address Information from DTE to SCDSU . 105 APPENDIX A . REFERENCES . 106 APPENDIX B . TYPE III CLOCK GENERATION AND RECOVERY . 108 iii EIA - - - T
32、IA-596 93 m 3234600 0503962 146 TIA/EIA-596 LIST OF FIGURES Figure 1-1 PSDS Interface Configurations . 2 Figure 5-1 Load Dependence of Output Constraint 13 Figure 5-2 PN127, RDL Turn-on Indicator 24 Figure 5-3 !PN127, RDL Turn-off Indicator . 24 Figure 6-1 Type II Transmit Pulse Parameters 28 Figure
33、 6-2 Type II Transmit Pulse Parameters Diagram 28 Figure 6-3 Type II Line Interface Balance . 29 31 Figure 6-5 Bridged Tap Loss Limits . 32 Figure 6-7 Burst Format 36 Figure 6-4 Bridged Tap Loss Contributions . Figure 6-6 Data Format on 64 kb/s Channel . 34 Figure 6-8 Transmit and Receive Burst Timi
34、ng at the SCDSU . 37 Figure 6-9 Type II Scrambling Masks 39 Figure 6-10 Type II Framing State Diagram Figure 6-11 Call Sequence Diagram - Idle Mode to Analog Made . . 47 Figure 6-12 Call Sequence Diagram - Analog Mode to Data Mode . . 47 Figure 6-14 Call Sequence Diagram - Disconnecting in Data Mode
35、 . 49 Figure 6-15 Call Sequence Diagram - Disconnecting in Analog Mode Figure 6-17 Type II Maintenance Time-Line Diagram Figure 7-1 Transmit Pulse Parameters 59 Figure 7-2 Loop Burst Format Figure 7-3 Sync State Diagram . Figure 7-4 TCM Frame Transmission and Reception Figure 7-6 Transmit State Diag
36、ram . I Figure 7-9 General Message Format and Sequence for Bulk Data Figure 7-11 SCDSU Status and Requirements - Near End Figure 7-12 SCDSU Status Requirements - Far End Figure 7-13 Command Sequence 91 Figure 7-14 Command Sequence Figure 7-15 Command Sequence Figure 7-16 Command Sequence 94 Figure 7
37、-17 Command Sequence 41 Figure 6-13 Call Sequence Diagram - Data Mode to Analog Mode . . 48 51 Figure 6-16 Type II Maintenance State-transition Diagram 52 53 61 62 64 Figure 7-5 FDHP Byte Format 67 68 Figure 7-7 Receive State Diagram 69 Figure 7-8 Basic Message Structure . 72 73 Transfer Figure 7-10
38、 SCDSU Status Requirements - Loopbacks . 86 87 88 92 92 94 Figure 7-18 Data Format . 96 iv EIA TIA-596 93 W 323LlbOO 0503963 082 W TIA/EIA-596 LIST OF TABLES Table 5-1 Summary of Type I Interface Characteristics - Netwrk Side . 9 Table 5-2 Connector Pin Assignments (SJA56) 18 Table 6-1 Summary of Ty
39、pe II 25 Table 6-2 Transmit Pulse Characteristics 27 Table 6-3 Cable Loss at 72 kHz . 31 Table 6-4 Control Byte Bit Values . 35 Table 6-5 Error Mapping of Framing Bit Field Toward Network in Response to Received Framing Errors . 42 Table 6-6 Connector Pin Assignments (SJA48) 43 Table 6-7 GTD Tone Ch
40、aracteristics . 44 Table 6-8 Control Byte Flow 44 Table 6-9 2713 Hz Test Tone Characteristics 54 Table 6-10 2025 Hz Test Tone Characteristics 55 Side 57 Table 7-2 Transmit Pulse Characteristics 59 Table 7-3 Pseudo-Random Generator Output 60 Table 7-4 Loop Length Limits 65 Table 7-5 Connector Pin Ass
41、ignments (SJA48) 66 Table 7-6 Transmit and Receive States . 68 Table 7-7 Typical Message Transfer . 71 Table 7-8 Data Values Maintenance for Operation of Cut-Off Relay 76 Table 7-10 Network-to-SCDSU Command Codes 83 Table 7-11 SCDSU Status Request - Data Rate Commands 86 Table 7-12 SCDSU-to-Network
42、Command Codes 89 Table 7-13 Translation Codes 90 Table 8-1 Category I and II Characteristics 99 Table 8-2 Pin Assignments . 104 Table 7-1 Summary of Type III Interface Characteristics - Network Table 7-9 Checksum for Minimum Message Sequence 77 Table B1 Synchronous Byte Repetition . 109 Table B2 Nea
43、rly Synchronous Byte Repetition 109 V EIA TIA-596 93 9 3234600 0503964 TL9 TIA/EIA-596 Page 1 Network Channel Terminating Equipment for Public -itched Digital Service 1. INTRODUCTION Public Switched Digital Services (PSDS) is a switched service offering providing the end user with the capability of
44、establishing, through the Public Switched Network (PSN), a 56 kb/s digital circuit. These interfaces can be either 4-wire, in-band signaling; a-wire, in-band signaling; or a-wire, out-of-band signaling metallic facilities, as shown in Fig 1-1. For purposes of this Standard, these interfaces are refe
45、rred to as Type I, Type II and Type III, respectively. This Standard establishes technical and functional requirements for the customer premises equipment known as Network Channel Terminating Equipment (NCTE) . This Standard includes the specification for NCTE interfaces to data terminal equipment (
46、DTE) interface, and end-to-end compatibility and maintenance requirements for connection to PSDS. Throughout this Standard, this equipment will be referred to as the Switched Circuit Data Service Unit (SCDSU) to distinguish it from the general category NCTE. This Standard fills a recognized need in
47、the telephone industry brought about by the use of equipment supplied by many different manufacturers. It should be useful to anyone engaged in the manufacture of DTE and auxiliary devices, and to those purchasing, operating or using such equipment or devices. As in most standards, two categories of
48、 criteria are specified, mandatory and advisory. The mandatory requirements are designated by the word shall; advisory requirements are designated by the word should, or desirable (which are used interchangeably in this Standard). The mandatory criteria generally apply to safety and protection, sign
49、aling and compatibility; they specify the absolute minimum acceptable requirements in areas such as transmission and equipment parameters and durability. Advisory or desirable criteria represent product goals. In some instances, these criteria are included in an effort to ensure universal product compatibility with equipment and facilities operational in statistically small quantities. In other cases, advisory criteria are presented when their attainment will enhance the general performance of the product in all its contemplated applications. Where both manda
