TIA/EIA STANDARD TI.AJEU-613. High Speed Serial Interface for Data Terminal Equipment and Data Circuit-Terminating Equipment

Transcription

1 ~~ EA TA-bB3 93 = ANS/ TA/ EA APPROVED: September 29, 993 TA/EA STANDARD - High Speed Seria nterface for Data Termina Equipment and Data Circuit-Terminating Equipment T.AJEU-63 NOVEMBER 993 TELECOMMUNCATONS NDUSTRY ASSOCATON

2 EA TA-bL b T NOTCE WEA Engineering Standards and Pubications are designed to serve the pubic interest thugh eiminating misunderstandings between manufacturers and purchasers, faciitating interchangeabiity and improvement of products, and assisting the purchaser in seecting and obtaining with minimum deay the proper product for his particuar need. Existence of such Standards and Pubiications shai not in any respect precude any member or nonmember of WEM from manufacturing or seing products not conforming to such Standards and hibications, nor shaii the existence of such Standards and Pubications precude their vountary use by- those other than WEA members, whether the standard is to be used either domesticay or internationay. Recommended Standards and Pubiications are adopted by WEA in accordance with the American Nationa Standards nstitute (ANS) patent poicy. By such action, WEU does not assume any iabiity to any patent owner, nor does it assume any obigation whatever to parties adopting the Recommended Standard or Pubication. This Standard does not purport to address aii safety probems associated with its use or a appicabe reguatory requirements. t is the responsibiity of the user of this Standard to estabish appropriate safety and heath pnctices and to determine the appicabiity of reguatory imitations before its use. hibished ELECOMMUNCATONS NDUSTRY ASSOCATON 993 Standards and Technoogy Department 200 Pennsyvania Ave. N.W., Washington, D.C PRCE: P- refer to current Cataog of EA & JEDEC STANDAR & ENGNEERNG PUBLCATONS or ca Goba Engineering Documents, USA and Canada ( ) nternationa ( ) AU rights reserved Printed in U.S.A.

3 EA TA-bL3 93 = HGH SPEED SERAL NTERFACE FOR DATA TERMNAL EQUPMENT AND DATA CRCUT-TERMNATNG EQUPMENT (From TNEA Standards Proposa No formuated under the cognizance of TA Subcommittee TR-30.2 on Data Transmission nterfaces) CONTENTS Page SCOPE.... Section Abstracts....2 Appication....3 Seriaization....4 Signaing Rates....5 Synchronous Communication... 2 NORMATVE REFERENCES SGNAL CHARACTERSTCS... 3 O 3. Eectrica Characteristics Protective Ground (Frame Ground) Shied Signa Common NTERFACE MECHANCAL CHARACTERSTCS Position nterface Connector Connector Contact Assignments FUNCTONAL DESCRPTON OF NTERCHANGE CRCUTS Genera... 9 O 5.2 Cassifications of Circuits Definitions of nterchange Circuits... O 5.3. Circuits 02 Signa Commons... O Circuit 03 Transmitted Data... O i

4 EA TA-b b 29 W O Circuit 04 Received Data... i 0 Circuit 07 DCE Ready... i i Circuit 082 DTE Ready... Circuits 43 and 44 Loopback A and Loopback 8... Circuit 42 Test Mode... Circuit 3 Transmitter Signa Eement Timing (DTE Source)... 2 Circuit 4 Transmitter Signa Eement Timing (DCE Source)... 2 Circuit 5 Receiver Signa Eement Timing (DCE Source) RECOMMENDATONS AND EXPLANATORY NOTES Line Signas Use of Circuits for Testing... 3 Loca Digita Loopback... 3 Loca Line Loopback... 3 Remote Line Loopback... 4

5 FOREWORD (This foreword is not part of this Standard) This Standard was formuated under the cognizance of TA Subcommittee TR on Data Transmission nterfaces. t is intended to be used with ANSTTNEA-62, Eectrica Characteristics for an nterface at Data Signaing Rates up to 52 MbiVs. Together these two standards provide for a genera purpose DTE-DCE interface for data rates up to a maximum of 52 Mbitís. iii

6 EA TA-b T28 ANS/TA/EA SCOPE. Section Abstracts This standard is appicabe to the interconnection of data termina equipment (DTE) and data circuit-terminating equipment (DCE) empoying seria binary data interchange with contro information exchanged on separate contro circuits. t defines: Section 2 Section 3 Section 4 Section 5 Normative References Signa Characteristics nterface Mechanica Characteristics Functiona Description of nterchange Circuits n addition, the standard incudes: Section 6 Recommendations and Expanatory Notes.2 Appication a This standard appies where equipment on one side of the DTE/DCE interface is intended for connection directy to equipment on the other side without additiona technica considerations. Appications where cabe termination, signa waveshaping, interconnection cabe distance, and mechanica configurations of the interface must be taiored to meet specific user needs are not precuded but are beyond the scope of this standard..3 Seriaization This standard appies to data communication systems where the data is bit seriaized. No restrictions are paced on the sequence of bits..4 Signaing Rates This standard is appicabe for use at data signaing rates up to a maximum imit of 52 Mbiüs..5 Synchronous Communication This standard appies to synchronous seria binary data communication systems.

7 EA TA-bL YT = ANS/TA/EA NORMATVE REFERENCES The foowing standard contains provisions which, through reference in this text, constitute provisions of this Standard. At the time of pubication, the edition indicated was vaid. A standards are subject to revision, and parties to agreements based on this Standard are encouraged to investigate the possibiity of appying the most recent edition of the standard indicated beow. ANS and TA maintain registers of currenty vaid nationa standards pubished by them. ANSíTA/EA Eectrica Characteristics For An interface At Data Signaing Rates Up To 52 Mbit/s 2

8 EA TA-bL3 93 = LOôL bôb ANS/TA/EA SGNAL CHARACTERSTCS 3. Eectrica Characteristics The eectrica characteristics of the interchange circuits are specified in ANS/TA/EA-62. The meaning of circuit conditions "ON" and "OFF" for contro and timing circuits, and "O", "", "MARK", and "SPACE" for data circuits, sha be as defined in ANSVTNEA Protective Ground (Frame Ground) n DTEs and in DCEs, protective ground is a point which is eectricay bonded to the equipment frame. t may aso be connected to externa grounds (e.g., through the third wire of the power cord). t shoud be noted that protective ground (frame ground) is not an interchange circuit in this standard. f bonding of the equipment frames of the DCE and the DTE is necessary, a separate conductor shoud be used that conforms to the appropriate nationa or oca eectrica codes. Attention is caed to the appicabe Underwriters' Laboratories reguation appying to wire size and coor coding. 3.3 Shied n order to faciitate the use of shieded interconnecting cabe the interface connector specified in Section 4 provides a shieded she for both the mae and femae connectors. At the DTE the shied is connected directy to the DTE Protective Ground. At the DCE the shied is connected through a network of two capacitors and a resistor as shown in Figure. t is recognized that for certain eectromagnetic i nt erf ere nce (EM i) suppression situations, additio na provisions may be necessary but are beyond the scope of this standard. 3.4 Signa 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 Circuits 02, Signa Commons. Both the DCE and the DTE normay shoud have their circuit common connected to their protective ground (frame ground) through a resistance of 00 ohms (+20%) having a power dissipation rating of one-haf watt. Figure iustrates the signa common and grounding arrangement. 3

9 ~~ EA TA-b3 93 M 3234b ANSTTNEA Baanced : A' Circuit : B ' ; nterchange :. a A ' ; Baanced : nterchange : B CircL"' Circuit 02 : (Signai Commons) i 470 R, /2 w Shied oon, '2W GWG Note ) c,. GWG (Note ) P- 00 R, 2w Frame Ground Signa Common Note : GWG is green wire ground of power system. Figure Signa Common and Grounding Arrangement 4

10 EA TA-bL ANS/TA/EA e 4 NTERFACE MECHANCAL CHARACTERSTCS Position nterface Connector The point of demarcation between the DTE and the DCE is ocated at a pugabe connector signa interface point between the two equipments (see Figure 2). A 50-position connector is the connector specified for a i nt erchang e circuits. Figure 3 iustrates the Cabe connector which has mae (pin) contacts and a femae she (pug connector). Figure 4 iustrates the Equipment connector which has femae (socket) contacts and a mae she (receptace connector). Contact numbering is aso iustrated in these figures. For a separabe connections at the DTE, DCE, or intermediate equipment between the DTE and the DCE; the Equipment connector (Figure 4) sha be used on the equipment and the Cabe connector (Figure 3) sha be used on the cabe. The cabe assembies wi aways use the Cabe connector (see Figures 2 and 3). N--<<->!>--rn Point of Demarcation Connector(s) with mae contacts and femae she +- Connector( s) with femae contacts and mae she Figure 2 DTE to DCE nterconnection 5

11 ~ EA TA m LOB4 395 m A 0 A (M T v (SU- v (5 PLANE ' PN 6 2,/ \ \PN 50 A SEATNG PLANE REFERS TO THE SURFACE THE CONNECTOR BOTTOMS ON UHEN FULLY MATED.. "U4 Figure 3 - Cabe Connector 6

12 EA TA b ô ANS/TA/EA R / LcR4 L 88 r - a e- i33 HOUS r NG LEAD-N DETAL A- A SEATNG PLANE REFERS TO THE SURFACE THE CONNECTOR BOTTOUS ON WHEN FULLY HATED. Figure 4 - Equipment Connector 7

13 ~ EA TA-bL3 93 W LOôb Lbô ANS/TA/EA Connector Contact Assignments Contact assignments are isted in the foowing tabe. nterchange Points A-A', 6-B' for each circuit shoud be assigned twisted pairs in interconnecting cabes to minimize crosstak. CONTACT NTERCHANGE PAR PONTS Cc' CRCUT NUMBER DRECTON 02 C-c' A-A B-B 5 From DCE A-A 07 From DCE B-B A-A E-B' 04 From DCE A-A B-B {Note) A-A B-B 4 From DCE c-c' o2 c-c' A-A O82 To DCE B-B A-A B-B 3 To DCE A-A 8-B 43 To DCE A-A B-B 03 To DCE A-A B-B 44 To DCE C-C 02 NOTE : Contact pairs 4 & 39 thru 8 & 43 are reserved for future use for interchange circuits To DCE. Contact pairs 5 & 30 and 20 & 45 thru 23 & 48 are reserved for future use for interchange circuits From DCE. 8

14 EA TA OT4 W ANS/TA/EA FUNCTONAL DESCRPTON OF NTERCHANGE CRCUTS 5. Genera This section defines the basic interchange circuits that appy, coectivey, to a systems. 5.2 Cassifications of Circuits nterchange circuits fa into four genera cassifications: Signa Common Circuits, Data Circuits, Contro Circuits, and Timing Circuits. A ist of interchange circuits showing circuit number, circuit name, circuit direction, and circuit type is presented in Tabe. Tabe - nterchange Circuits CRCUT CRCUT NUMBER NAME 02 Signa Commons 03 Transmitted Data Received Data CRCUT DRECTON To DCE From DCE CRCUT TYPE COMMON DATA Loopback A Loopback B Test Mode Transmitter Signa Eement Timing (DTE Source) Transmitter Sig na Eement Timing (DCE Source) Receiver Signa Eement Timing (DCE Source) To DCE From DCE To DCE From DCE From DCE TMNG 9

15 EA TA-bL3 93 W T30 m ANS/TA/EA Definitions of nterchange Circuits 5.3. Circuits 02 - Signa Commons Direction: Not Appicabe These conductors directy connect the DTE circuit ground (signa common) to the DCE circuit ground (signa common) to provide a conductive path between thedte and DCE signa commons (see 2.4) Circuit 03 - Transmitted Data Direction: To DCE Signas on this circuit are generated by the DTE and are transferred to the oca DCE for transmission of data to remote DCE or for maintenance or contro of the oca DCE. The transitions between signa eements on this circuit nominay occur at the time of the transitions from OFF to ON condition on Circuit 4 (Transmitter Signa Eement Timing (DCE Source)). The DTE sha hod this circuit in a steady condition for the duration of each signa eement (.e., from an OFF to ON transition on Circuit 4 to the next OFF to ON transition on Circuit 4). n a systems, the DTE sha not transfer data to the DCE on this circuit uness an ON condition is present on both of the foowing circuits: Circuit 07 (DCE Ready) Circuit 08/2 (DTE Ready) The DTE sha hod Circuit 03 (Transmitted Data) in a marking condition when either Circuit 07 (DCE Ready) or 08í2 (DTE Ready) is in the OFF condition Circuit 04 - Received Data Direction: From DCE Signas on this circuit are generated by the DCE in response to data signas received from the remote DCE, or for maintenance or contro purposes. n a systems, the DCE sha not transfer data to the DTE on this circuit uness an ON condition is present of both of the foowing circuits: Circuit 07 (GCE Ready) Circuit 08/2 (DTE Ready) 0

16 i EA TA-b3 93 M 323LibOO M ANS/TA/EA Circuit 07 - DCE Ready Direction: From DCE Signas on this circuit are used to indicate whether the DCE is ready to operate. The ON condition indicates that the DCE is ready to exchange data with the DTE Circuit 08/2 - DTE Ready Direction: To DCE Signas on this circuit are used to indicate whether the DTE is ready to operate. The ON condition indicates that the DTE is ready to exchange data with the DCE Circuits 43 and 44 - Loopback A and Loopback B Direction: To DCE Signas on these circuits are used to request the oopback test conditions (see Section 6) as described in the foowing tabe: nterchange Circuits OFF Request oo^ back Loca Line Remote Line Loca Diaita Circuit 42 - Test Mode Direction: From DCE Signas on this circuit indicate whether the oca DCE is in a test condition. e The ON condition of Circuit 42 (Test Mode) indicates to the DTE that the DCE has been paced in a test condition. The ON condition of Circuit 42 (Test Mode) sha be in response to an ON condition of Circuits 43 (Loopback A) and/or 44 (Loopback B) and indicates that the condition has been estabished. The ON condition sha aso be in response to either oca or remote activation, by other means, of any DCE test condition. The OFF condition of Circuit 42 (Test Mode) indicates that the DCE is not in a test mode and is avaiabe for norma service.

17 ~~~ EA TA-bL b99 ANS/TNEA Circuit 3 - Transmitter Signa Eement Timing (DTE Source) Direction: To DCE 0 Signas on this circuit are used to provide the DCE with codirectiona timing information. Circuit 3 (Transmitter Signa Eement Timing (DTE Source)) is the signa from Circuit 4 (Transmitter Signa Eement Timing (DCE Source)) returned to the DCE by the DTE. The transition from ON to OFF sha nominay indicate the center of each signa eement on Circuit 03 (Transmitted Data). NOTE - The purpose of providing codirectiona timing is to insure the proper phase reationship between Circuits 03 (Trans-iitted Data) and Circuit 4 (Transmitter Signa Eement Timing (DCE Source)). This is necessary because the propagation deay of the interconnecting cabe may exceed one unit interva Circuit 4 - Transmitter Signa Eement Timing (DCE Source) Direction: From DCE Signas on this circuit are used to provide the DTE with signa eement timing information. The DTE sha provide a data signa on Circuit 03 (Transmitted Data) in which the transitions between signa eements nominay occur at the time of the transitions from OFF to ON condition of the signa on Circuit 4 (Transmitter Signa Eement Timing (DCE Source)). The withhoding of timing information is permitted when specified by user appications. During intervas when timing information is not transferred across the interface, this circuit sha be hed in the OFF condition Circuit 5 - Receiver Signa Eement Timing (DCE Source) Direction: From DCE Signas on this circuit are used to provide the DTE with received signa eement ti mi ng information. The transition from ON to OFF condition sha nominay indicate the center of each signa eement on Circuit 04 (Received Data). The withhoding of timing information is permitted when specified by user appications. During intervas when timing information is not transferred across the interface, this circuit sha be hed in the OFF condition. 2

18 i EA TA-bL L 525 ANS/TA/EA e 6 RECOMMENDATONS AND EXPLANATORY NOTES 6. Line Signas t is not within the scope of this standard to specify in detai what occurs on the communication channe (ine) side of the DCE. 6.2 Use of Circuits for Testing Loca DTE Loca DCE Remote DCE Remote DTE Figure 5 - Test Loops 6.2. Loca Digita Loopback (Loop A) O This test condition provides a means whereby a DTE may check the functioning of the DTE/DCE interface. n the Loop A test, the transmitted data, Circuit 03 (Transmitted Data) from the DTE, is returned to the DTE on Circuit 04 (Received Data). The condition of various interchange contro circuits at the oca DTE/DCE interface during a Loca Digita Loopback (Loop A) test condition, is summarized in the foowing tabe: nterchange Circuit Condition ON ON ON ON Loca Line Loopback (Loop B) This test condition provides a means whereby a DTE may check the functioning of the DTE/DCE interface and the transmit and receive sections of the oca DCE. The oca DCE aso may be tested with a test set in pace of the DTE. n the Loop B test, the output of the transmitting section of the DCE is returned to the receiving section of the DCE, through such circuitry as may be required for proper operation. 3

19 ~ ~~ ~~ EA TA ANS/TA/EA bL. The condition of various interchange contro circuits at the oca DTE/DCE interface during a Loca Line Loopback (Loop B) test condition, is summarized in the foowing tabe: nterchange Circuit Condition OFF 42 ON Remote Line Loopback (Loop C) This test condition provides a means whereby a DTE may check the transmission path up to the ine interface of the remote DCE and the simiar return transmission path. n the oop position the two pairs from the ine are from the DCE functionaity and are connected to each other. Remote Line Loopback (Loop C) impies that the remote DCE be signaed from the oca DCE to actuate the Loop C test condition. Since such contro is effected over the communication channe, appropriate measures must be taken to guard against fase operation by data or noise. The condition of various interchange contro circuits at the oca and remote DTE/DCE interfaces during a Remote Line Loopback (Loop C) test condition is summarized in the foowing tabe: nt e rc h ang e Circuit Loca n te rf ace ON OFF ON ON Remote nterface OFF OFF OFF ON 4