1、 TIA-688-1997 APPROVED: DECEMBER 23, 1997 REAFFIRMED: APRIL 10, 2003 REAFFIRMED: DECEMBER 7, 2012 TIA-688 January 1998DTE/DCE Interface for Digital Cellular Equipment NOTICE TIA Engineering Standards and Publications are designed to serve the public interest through eliminating misunderstandings bet
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19、IA WITHOUT SUCH LIMITATIONS. - STD=EIA TIA-688-ENGL 3998 3234b00 0578346 4Tb m ANSITTINEIA-688 DTEIDCE INTERFACE FOR DIGITAL CELLULAR EQUIPMENT (From TIAEIA Standards Proposal No. 3738 formulated under the cognizance of TIA Subcommittee TR-30.2 on Data Transmission Interfaces) CONTENTS Page 1 1 SCOP
20、E . 1 1.1 Section abstracts . . 1 1.2 Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.3 Serialization . . . . . . . . . . . . .
21、. . ._. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.4 Signaling rates 1 1 .5 Synchronous/nonsynchronous communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
22、. . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2 NORMATIVE REFERENCES 1 3 SIGNAL CHARACTERISTICS .,2 3.1 Electrical characteristics . 2 3.2 Protective ground (frame ground) . _ . 2 3.3 Shield 2 3.4 Signal common . 2 3.5 “Fail Safe“ operation . . . . ._. . . . . _. . . . . . . . . . ._. . .
23、. . . . . . . . . . . . . . . . . . . . 3 4 INTERFACE MECHANICAL CHARACTERISTICS .3 4.1 4.2 5 12-Position interface connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 Connector conta
24、ct assignments . .6 FUNCTIONAL DESCRIPTION OF INTERCHANGE CIRCUITS 6 5.1 General . 6 i 5.2 5.3 5.3.1 5.3.2 5.3.3 5.3.4 5.3.5 5.3.6 5.3.7 5.3.8 5.3.9 6 Classifications of circuits . . . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
25、 . . . . . . . . . . . . . . . . . . . . . . . . Definitions of interchange circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Signai Common . 7 Transmitted Data . 7 Circuit 102 Circuit 103
26、Circuit 104 Circuit 106 Circuit 107 Circuit 10812 Circuit 109 Circuit 125 Circuit 133 5.3.10 Circuit 135 5.3.1 1 Circuit NSF 5.3.12 Circuit 114 5.3.13 Circuit 115 Received Data . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Clear to Send . : . . . . . . . . . . . . . . .#. . . . . . 8 DCE R
27、eady . 8 DTE Ready . 9 Received Line Signal Detector 9 Ring indicator . . . . . . . . . . . . . . . . 1 O Ready for Receiving . . . . . . . . . . . . 1 O Received Energy Present . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 O Nonstandard Function .
28、 . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . 1 1 Transmitter Signal Element Timing (DCE Source) 11 Receiver Signal Element Timing (DCE Source) 11 ii STD-EIA TIA-688-ENGL 1998 3234600 0598148 279 ANS /TINE IA-688 FOREWORD (This foreword is not part of this Standard) This S
29、tandard was developed in response to a requirement of TIA Committee TR45.3 for a DTE/DCE interface standard for Digital Cellular equipment. Although intended for that specific use, this Standard could be used for other DTE/DCE interfaces of a more general nature. iii ANSITTINEIA-688 i SCOPE 1 .I Sec
30、tion abstracts This Standard is applicable to the interconnection of data terminal equipment (DTE) and data circuit-terminating equipment (DCE) employing serial binary data interchange. It defines: Section 2 NORMATIVE REFERENCES Section 3 SIGNAL CHARACTERISTICS Section 4 INTERFACE MECHANICAL CHARACT
31、ERISTICS Section 5 FUNCTIONAL DESCRIPTION OF INTERCHANGE CIRCUITS 1.2 Application This Standard applies where equipment on one side of the DTE/DCE interface is intended for connection directly to equipment on the other side without additional technical considerations. Applications where cable termin
32、ation, signal waveshaping, interconnection cable distance, and mechanical configurations of the interface must be tailored to meet specific user needs are not precluded but are beyond the scope of this Standard. 1.3 Serialization This Standard applies to data communication systems where the data is
33、bit serialized. No restrictions are placed on the sequence of bits. 1.4 Signaling rates This Standard is applicable for use at data signaling rates up to a nominal limit of 128 kbis. Equipment complying with this Standard, however, need not operate over this entire data signaling rate range. Equipme
34、nt may be designed to operate over a narrower range as appropriate for the specific application. 1.5 Synchronouslnonsynchronous communication This Standard applies to both synchronous and nonsynchronous serial binary data communication systems. 2 NORMATIVE REFERENCES The following Standard contains
35、provisions which, through reference in this text, constitute provisions of this Standard. At the time of publication, the edition indicated was valid. All Standards are subject to revision, and parties to agreements based on this Standard are 1 STD-EIA TIA-688-ENGL 1998 3234600 0578350 927 ANSITTIAI
36、EIA-688 encouraged to investigate the possibility of applying the most recent edition of the standard indicated below. ANSI and TIA maintain registers of currently valid national standards published by them. ANS IlTIA/EIA-694 Etectdcal Characteristics for An Unbalanced Digital Interface for Data Sig
37、naling Rates up to 572 kbps 3 SIGNAL CHARACTERISTICS 3.1 Electrical characteristics The electrical characteristics of the interchange circuits are specified in ANSITTIAIEIA-694. The meaning of circuit conditions ON“ and OFF“ for control and timing circuits, and “l“, “O“ for data circuits, shall be a
38、s defined in ANSI/TIA/EIA-694. 3.2 Protective ground (frame ground) In DTEs and in DCEs, protective ground is a point that is electrically bonded to the equipment frame. It may also be connected to external grounds (e.g., through the third wire of the power cord). It should be noted that protective
39、ground (frame ground) is not an interchange circuit in this Standard. If bonding of the equipment frames of the DCE and the DTE is necessary, a separate conductor should be used that conforms to the appropriate national or local electrical codes. Attention is called to the applicable Underwriters La
40、boratories regulation applying to wire size and color coding. 3.3 Shield Normally the DCE should make no connection to shield. It is recognized that for certain electromagnetic interference (EMI) suppression situations, additional provisions may be necessary but are beyond the scope of this Standard
41、. 3.4 Signai common Proper operation of the interchange circuits requires the presence of a path between the DTE circuit common and the DCE circuit common. This path is obtained by means of interchange Circuit 102, Signal Common. Within the DCE, this circuit shall be brought to one point and it shal
42、l be possible to connect this point to Protective Ground by means of a strap inside the equipment, if such protective ground exists. This strap may be connected or removed, at installation, as required to meet applicable regulations or to minimize the introduction of noise into the electronic circui
43、try. This strap may be paralleled by an impedance (high at low frequencies) to provide, when the strap is removed, for immunity to static discharges or for other purposes. 2 - STD-EIA TIA-b88-ENGL 1998 H 3234600 0598151 863 ANSITTINEIA-688 3.5 “Fail Safe” operation The receivers for interchange Circ
44、uits 107 (DCE Ready), 108/2 (DTE Ready) and NSF (Nonstandard Function) shall detect any of the following as a circuit-off condition: the equipment connected across the interface is in a power-off condition, the interface cable is disconnected, or the interconnecting cable does not implement the circ
45、uit. The specification of “fail safe” operation is found in ANSI/TINEIA-694. 4 INTERFACE MECHANICAL CHARACTERISTICS 4.1 12-Position interface connector The point of demarcation between the DTE and the DCE is located at a pluggable connector signal interface point between the two equipments that is l
46、ess than 3 meters (10 feet) from the DCE (see Figure 1). A 12-position connector is the connector specified for all interchange circuits. An optional coaxial connector may be included for radio frequency connection of digital cellular equipment. The connector associated with the DTE shall have femal
47、e contacts and a male shell, The connector associated with the DCE shall have male contacts and a female shell. Figure 2 illustrates the DTE interface connector that has female contacts and a male shell. Figure 3 illustrates the DCE interface connector that has male contacts and a female shell. Cont
48、act numbering is also illustrated in these figures. Point of Demarcation i 3 Meters (10 feet) u Maximum Figure 1 - DTE to DCE interconnection 3 STD-EIA TIA-b88-ENGL 1998 m 3234600 0598L52 7TT m ANSITTINEIA-688 PIN B t 7 L PIN ( of I 2.00- C.0791 1 , , .,- I*. I ,a, I V IlII I -3.80 c. 1521 1.27 C. 0
49、501 r l i B L.64 C. 0253 5 I GNALS $ OF PART SECTION B-B 4.57 c. 1804 4 C. 0231 1 SECT 1 ON A-A 1 .6S- c. o51 Figure 2 - DTE Interface Connector 4 STD=EIA TIA-688-ENGL 1998 3234600 0598153 636 ANS ITTINE IA-688 c. w I .30A C.05il 2.00- C. 0791 C. 0391 5 PLL * 50 c.0203 I .89- c353 PIN r- * OF . RT b15.85d C. 6261 . a3 0323 u SECTION A-A 3.30 C. 1301 SHELL OD r C. 1801 SECTION 8-B Figure 3 - DCE Interface Connector 5 STD.EIA TIA-688-ENGL 1998 3234600 0598354 572 ANSITTINEIA-688 4.2 Connector contact assignments Contact assignments are
