1、 TIA/EIA-578-B-2000 APPROVED: NOVEMBER 16, 2000 REAFFIRMED: SEPTEMBER 26, 2005 REAFFIRMED: JULY 29, 2014 TIA-578-B (Revision of TIA/EIA-578-A) November 2000Asynchronous Facsimile DCE Control Standard- Service Class 1 NOTICE TIA Engineering Standards and Publications are designed to serve the public
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20、e Digital Interfaces -Asynchronous Facsimile DCE Control Standard, Service Class 1CONTENTS1 INTRODUCTION these arecalled “FAX boards“. Others are configured as an external “facsimile DCE“, connected to the DTE by astandard serial port (e.g. EIA/TIA-232-E, ITU-T V.24), using serial data interchange.1
21、.3 ScopeThis standard contains protocols for use between a DTE and a Facsimile DCE. It includes automaticcalling and answering.This standard defines the commands that the DTE may issue to configure and control the DCE, and theresponses the facsimile DCE may issue to those commands.This standard is u
22、seful for intelligent DTEs and DTE software, facsimile DCEs, facsimile terminals, andMulti-Functional Devices with digital connection to DTEs.This standard assumes that the DTE and DCE are connected via serial asynchronous connection usingEIA/TIA-232-E (or ITU-TITU V.24) circuits. However, the proto
23、cols defined may be implemented in anyenvironment that provide a character serial bi-directional data stream, including processor bus attached “faxboards“, local area networks, Small Computer Systems Interface (SCSI, ANSI X3.131), IEEE 1284 parallelports, etc. The adaptation of the protocols and pro
24、cedures to these alternative communication schemes isfor future study.TIA-578-B22 OverviewA system including a DTE and a facsimile DCE partitions Group 3 facsimile functions between the twodevices. There are several levels in the communications path where a functional partition can be made.This stan
25、dard describes protocols for use at one of those levels, Service Class 1. Each level is describedas a “Service Class“ based on the functions performed by the DCE.2.1 Service Class 1Section 7 of this document describes a set of services at the physical and data link layers: waiting,signaling, and HDL
26、C data formatting. ITU-T T.30 session management and ITU-T T.4 image data handlingare done by the DTE.2.2 Service Class 2TIA/EIA-592, Asynchronous Facsimile DCE Control Standard, Service Class 2, describes a facsimile DCEwhich provides a set of services described by ITU-TITU-T Recommendation T.30. T
27、he facsimile DCE makesand terminates calls, manages the communication session, and transports image data. The DTE preparesand interprets image data in compressed form, as described in ITU-T recommendation T.4.2.3 Service Class 3 (for further study)A Service Class 3 facsimile DCE converts image file
28、data into ITU-T T.4 compressed images fortransmission, and may reverse the conversion on reception.2.4 Service Class 4 (for further study)A Service Class 4 DCE contains similar services to those described by this standard. In addition, it definesan improved mechanism for DTE-Facsimile DCE interactio
29、n, including an on-line data mode wherecommands are embedded within the data stream, and DTE commands and DCE responses are buffered;this mode can provide substantial relief from DTE critical timing in those environments where the DTEcannot maintain the responsiveness necessary to support a Service
30、Class 1 DCE.TIA-578-B33 Normative ReferencesThe following standards contain provisions which, through reference in this text, constitute provisions of thisInterim Standard. At the time of publication, the editions indicated were valid. All standards are subject torevision, and parties to agreements
31、based on this Standard are encouraged to investigate the possibility ofapplying the most recent editions of the standards indicated below. ANSI and TIA maintain registers ofcurrently valid national standards published by them.ANSI/EIA/TIA-232-E, Interface between data terminal equipment and data com
32、munication equipmentemploying serial binary data interchange on unbalanced circuits.ANSI/TIA/EIA-592-1992, Asynchronous Facsimile DCE Control Standard, Service Class 2ANSI/TIA/EIA-602-1992, Serial Asynchronous Automatic Dialing and ControlANSI/TIA/EIA-615-1992, Serial Asynchronous Automatic Dialing
33、and Control - Extended Command SyntaxTIA/EIA IS-101-1993, Facsimile Digital Interfaces - Voice Control Interim Standard for Asynchronous DCE.ITU-T() T.4-1993, Standardization of Group 3 Facsimile Apparatus for Document Transmission.ITU-T() T.30-1993, Procedures for Document Facsimile Transmission in
34、 the General Switched TelephoneNetwork.ITU-T T.31-1995, Serial Asynchronous Facsimile DCE Control, Service Class 1ITU-T T.32-1995, Serial Asynchronous Facsimile DCE Control, Service Class 2ITU-T Recommendation T.50 (1992), International Reference Alphabet (IRA) (formerly International AlphabetNo. 5
35、or IA5) Information technology 7-bit coded character set for information interchange.ITU-T Recommendation V.4, General Structure of signals of International Alphabet Number 5 code for datatransmission over public telephone network.ITU-T Recommendation V.8 (1994), Procedures for starting and ending s
36、essions of data transmission overthe general switched telephone network.ITU-T Recommendation V.17, 14400 bit/s 2-wire modem standardized for use in Facsimile Applications.ITU-T Recommendation V.21, 300 bit/s duplex modem standardized for data transmission over the generalswitched telephone network.I
37、TU-T Recommendation V.24, List of definitions for interchange circuits between data terminal equipmentand data circuit terminating equipment.ITU-T Recommendation V.25, Automatic Calling and/or Answering equipment on the GSTN, includingdisabling of echo suppressers on manually established calls.TIA-5
38、78-B4ITU-T Recommendation V.250 - 1995, Serial Asynchronous Automatic Dialing and ControlITU-T Recommendation V.27ter, 4800/2400 bit/s modem standardized for use in the general switchedtelephone network.ITU-T Recommendation V.29, 9600 bit/s modem standardized for use on point-to-point leased telepho
39、ne-type circuits.ITU-T Recommendation V.33, 14400 bit/s modem standardized for use on point-to-point 4-wire leasedtelephone-type circuits.ITU-T Recommendation V.34 (1996), A modem operating at data signaling rates of up to 33 600 bit/s for useon the general switched telephone network and on leased p
40、oint-to-point 2-wire telephone-type circuits.ISO 646, 7 bit coded character set for information processing interchange.ISO 2111-1972, Data communication - Basic-mode control procedures - Code independent informationtransfer.4 DefinitionsFor the purposes of this standard, the following definitions sh
41、all apply:DTE, Data Terminal Equipment A DTE is any terminal or computer capable of providing commands anddata to operate a DCE or facsimile DCE. In practice, these are computers of any size.DCE, Data Circuit Terminating Equipment A DCE is any device that connects a DTE to acommunications network. T
42、his standard focuses on DCEs which connect to the General SwitchedTelephone Network (GSTN). This class of DCEs includes DCEs compatible with the ITU-T V Series modemrecommendations and facsimile DCEs described below.Facsimile DCE A facsimile DCE is a device which provides facsimile communication fac
43、ilities between aDTE and the GSTN. A Class 1 facsimile DCE includes the following functions:Control FunctionsInterchange circuits to the DTEHDLC Data Link Layer FunctionsV Series Signal convertersAutodialer FunctionsGSTN InterfaceFacsimile DTE A facsimile DTE must provide those Group 3 facsimile fun
44、ctions and services not providedby the facsimile DCE. The specific implementation of these functions is beyond the scope of this standard.5 Facsimile DTE-DCE Interchange CircuitsA facsimile DCE described by this standard uses an asynchronous serial connection between the DTE andthe DCE. Typically, s
45、erial data is formatted in 10 bit character frames, including a start bit, 8 data bits, noparity and 1 stop bit. Use of this protocol on other DTE-DCE interfaces is beyond the scope of thisstandard.TIA-578-B55.1 DTE-DCE Communication Link Data RatesThe DTE-facsimile DCE communications link shall pro
46、vide full duplex character data at rates fastenough to accommodate the transfer of synchronous T.30 Phase C data. A data rate greater than or equalto 18,000 bit/s (e.g. 19,200 bit/s) is the minimum rate needed to support 14,400 bit/s V.17 Phase C data. Adata rate greater than or equal to 42,000 bit/
47、s is the minimum rate needed to support 28,800 bit/s V.34Phase C data. With flow control, it is not necessary, and not recommended, to change the DTE-DCEcommunications link data rate during facsimile operation. Mechanisms to set the DTE-DCE serial rate aredescribed in 6.10 and 6.2.10/V.25 ter (IPR p
48、arameter).5.2 Asynchronous to Synchronous conversionGroup 3 data communication is bit-synchronous. The DCE must delete start and stop elements from thesecharacters before transmission and add them to received octets. Bit sequencing is maintained between theDTE-DCE interface and the DCE-remote statio
49、n interface, as specified in T.4 and T.30.5.3 Flow ControlFlow control is necessary to match the DTE-DCE data rate to the line signaling rate and to the requirementsof Group 3 data transmission. (For example, provision must be made for minimum scan line times.)Provision of in-band unidirectional DC1/DC3 (XON/XOFF) flow control is mandatory; flow control using V.24circuits 106 and 133 is optional.This standard specifies an optional command to configure DCE flow control, +FLO, described in section8.5.1. See also Annex B.7 and Annex CThe response times of the DCE to indication of a
