Local Analog Loopback With Self-Test AT&T8 | Intel MD566X specs

56K V.92 Data, Fax, and Voice Chipset

3.9.2 Local Analog Loopback With Self-Test [AT&T8]

This test is used by the local DTE to check the DTE-to-modem communication integrity.

DTE

		LOCAL MODEM
TXD	PATTERN		TRANSMITTER
	PATTERN
	GENERATOR
	GENERATOR
RXD	PATTERN
	PATTERN		RECEIVER
	CHECKER		RECEIVER
	CHECKER

Figure 3-3. Local Analog Loopback with Self-Test

Local Modem (or Test Modem)

AT&F &W<CR>	Returns the modem to the factory de-
	faults.
AT S18=20 &T8	Causes the modem to start local analog
	loopback with self-test for 20 sec-
	onds.
OK	After starting analog loopback, the mo-
	dem goes back to command mode.
AT	The modem responds to new commands.
OK
000	After 20 seconds, the modem stops ana-
	log loopback, sends
OK	An error count to the DTE, and enters
	command mode.
AT S18=0 &T8	Causes the modem to start local analog
	loopback with self-test, which is only
	terminated by AT&T0 or ATH.
OK	After starting analog loopback, the mo-
	dem goes back to command mode.
AT	The modem responds to new commands.
OK
AT&T0	After receiving AT&T0 or ATH, the modem
	stops analog
000	loopback, sends an error count to the
	DTE, and enters

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Intel Confidential

Programmer’s Guide

Image 38

Intel MD566X manual Local Analog Loopback With Self-Test AT&T8, Local Analog Loopback with Self-Test

Contents

MD566X Revision History Programmer’s Guide Symbol Units of measureConventions Acronym Definition Dram Intel V.90/V.92 56K Chipsets Chipset Contents QtyIntroduction V.92, V.90 and V.34 Data Modes Modem Connection Overview Mode Data Rate bps Affected Data DTE-to-DCE Data Rates for Each ModeDCE-to-DCE Data Rates for Each Mode Command Function Default Range Reported by AT Command Summary TablesData Mode Command Summary Intel Confidential Data rate Result code type Yes Ports only Async mode +GMI? Intel Confidential V.44 / V.42 / V.42 bis MNP∗ Command Summary Command Function Default Range Reported By &Vn Intel Confidential Value saved in Nvram IS-101 Voice Command Summary Fax Identity Command SummaryFax Class 1 Command Summary Voice DTE→DCE Character Pairs Response Hex Code Function Voice DTE←DCE Character Pairs S-Register Summary Dial Modifiers Command FunctionRegister Function Default Range Units Reported By &Vn 10. V.90/V.92 Mode DCE-to-ISP Response Codes Verbose Code Numeric Code 11. V.34 Mode DCE-to-DCE Response Codes 12. DTE-to-DCE Data Rate Response Codes 13. Manufacturing-Only Command Summary a Command Function Default Range Modem Responses and Command Echo En, Vn, Xn, Wn, Qn Basic Data Mode AT CommandsUsing AT Commands to Access the S-Registers Sn?, Sn=x, ? Modem Setup Host Command Modem Response Example of a Remote Connection Product Identification Information Information Establishing a Modem Connection A, D, DS = n, S0 Modem-to-Modem Connection Data Rates Online Command Mode Escape Codes, OnHanging Up Hn, S10, Zn, &D2 Intel Confidential Intel Confidential ATH +PMHF +PMHR Supported Modulation Types Carrier Description +MS = carrier , automode, min rate, max rate S37 Originating Answering Resulting Connection Speed Modem Figured to attempt only a 28,800 bps connec Diagnostic Testing S18, &Tn Local Analog Loopback AT&T1 AT&T0 Local Analog Loopback With Self-Test AT&T8 Local Analog Loopback with Self-Test Time-Independent Escape Sequence AT Escape SequencesLicensing Requirements for Hayes Escape Sequence Hayes∗ Escape Sequence None Data Mode Command DescriptionsCommand Default Description Stant carrier mode Dialing Digits Online data mode echo Reports product code Cont ATI5 Mode from online command mode Sn=x Sn? Protocol Lapm Sequent commands to be ignored For data mode Ports asynchronous mode. This command is the same as &M0 User profile n Modem power-up Zn=x None +GMR? +MS=m See m V34BS Modulation Selection Cont Examples DTE data rate = 2400 bps Examples DTE data rate = 115,200 bps+MS=m +PCW=m +PMH=m +PMHR none DCE +PSS=m Mand Intel Confidential Error Correction and Data Compression Mode Features Resulting \Nn Connection Types Bis with fallback to MNP5 \N3 \An \Bn None \Jn \Cn\Gn \Kn \Nn \Xn \Qn\Tn Intel Confidential 140,1884 3768 0,471+DS44=m 972,140 Fax Identity Command Descriptions FAX Class 1 AT CommandsFax Identity Commands Tocols Fax Class 1 Commands +FREV?/+FMR? none Mod Selection Table Value Modulation Speed Bps Class 1 DTE-Generated Hdlc Frame Information AT+FTH=mod Fax Mode Command Descriptions +FCLASS=1 +FRM=n None Command Default Description Receive Hdlc Data+FRH=n +FRS=n None DTE after receiving the +FTH=mod command Data using the modulation selected in mod IS-101 Voice Mode AT Commands Each command may be used as follows Dtmf Detection Relay Control Voice Mode Command Descriptions +FLO=n +VBT=m +VCID=n +VEM=m See m Enable Report Function+VDR=m +VEM=m Dialtone Event Reporting and Masking Example 2. Setting the Event MaskExample 3. Reading the Event Mask Settings Example 1. Viewing Supported Events +VGS=n +VGM=n 128+VGR=n 128 +VGT=n +VIP none Code +VLS=n +VNH=n Relay/Playback ControlPrimitive Code +VLS=n Intel Confidential +VRX none = sds, sdi Defaults m = 128 +VSD=m See ‘m’ Manufac +VSM=m turer- specified Vsr Comments Samples/second Vsr Compression Method Selection+VSM=m Manufac Hard Disk +VSP=n +VTD=n 100 +VTS=m none Dtmf and Tone Generation AT+VTS=DTMF or AT+VTS= , ,duration For example AT+VTS= , ,50 Intel Confidential S-Register Command Descriptions Registers Ascii decimal S12 S10S11 S14 138 S16 S21 S22 118 S23 None S27 S31 S33 Maximum Line Speed Attempted 110 Caller ID Caller ID Tags for Formatted Reporting Ring NCnn MANUFACTURING-ONLY CommandsManufacturing-Only Command Descriptions S91 S92 $TTnn Tone Test Command Analog Loopback ALB Test FAX Test #VGP1=n See Note Command Bit Pins#VGP0=n #VGP2=n 118 119 Parallel Host Interface 16C450/16C550A UartProgrammer’s Guide Parallel Host Interface Uart Register Bit Assignments Register BIT Number Address Name Modem Status Register MSR Uart Register DefinitionsScratch Register SCR Line Status Register LSR Are no subsequent Fifo errors Modem Control Register MCR Line Control Register LCR 123 Fifo Control Register FCR Trigger Level Bytes 125 Interrupt Identity Register IIRInterrupt Control Functions 10.1.10Receiver Buffer Register RBR Interrupt Enable Register IERTransmitter Holding Register THR 10.1.11Divisor Latch Registers DLM and DLL Fifo Interrupt Mode Operation10.2 16C550A Uart Fifo Operation Programmable Data Rates Fifo Polled Mode Operation 129 130