Received Signal Power Level RX | ZyXEL Communications U-336R/RE

Received Signal Power Level (RX)

This reading is expressed in 1 dBm resolution. The modem measured receiving signal power is generally within 1-2 dBm of the actual value with relative accuracy. The receiver sensitivity specification for your modem is -43 dBm. Strong signal power could cause signal saturation in the channel and degrade the data validity. To avoid this situation, decrease the transmission power of the remote modem. For increased line operability, your modem’s transmission power level on a leased-line operation could be adjusted from 0 dBm to -27 dBm. The default value is -11 dBm.

Phase Jitter (PJ)

This reading is expressed in peak-to-peak degrees for phase jitter in the 20 to 300 Hz frequency range in 1 degree resolution.

Frequency Offset (FO)

Frequency offset is expressed in 1 Hz resolution. It is the difference between the transmitted carrier frequency and the received carrier frequency.

Retrain Granted (RG)

The count of the granting of the remote modem's retrain requests. Each request is an indicator of bad receiving conditions.

Retrain Requested (RT)

The count of the local modem's requests for the remote modem to retrain when the signal quality is poor.

Round Trip Echo Delay (ED)

Measured in T (1/2400 sec.). Will be re-measured in every retrain action.

Carrier Loss Counter (CL)

When operated over a leased line, it is the count of the carrier's temporary drop-out, if there is any.

Diagnostics & Troubleshooting 121

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ZyXEL Communications U-336R/RE manual Received Signal Power Level RX

Contents

ZyXEL ZyXEL Limited Warranty Copyright 1997 by ZyXEL FCC Part 15 InformationAcknowledgments Iii Information for Canadian Users Page ∙ E-mail Contacting ZyXEL Vii Contents Leased Line Operation Synchronous Mode Operation Fax Operation Special Functions Diagnostics & Troubleshooting AT Command Set SummariesStatus Registers & Result Codes Upgrading Your Modem Index Terminal PinoutsXii Standard Features Modem FeaturesIntroduction Intelligent Features Fax Compatibility Technical Specifications Enclosed Equipment Unpacking Your ModemRequired Equipment Becoming a Registered Owner Introduction Installation Installation336R/RE Modem Card Name Blinking RXD TXDDTR DSR Required Steps for U-336R/RE Installation Connect to phone lines Installing the modem card Fax/Modem Communication Software Installation Hooking Up PowerConnect to Computers AT&F Setting Value For troubleshooting suggestions Installation Using the Windows 95 Hyper Terminal Program Understanding AT CommandsBasic Modem Operation Basic Modem Operation ATEnter Dialing and Answering Techniques Dialing using the ATD Command Auto-Answer and Hook Controls Making Your First ConnectionATS0=n ATS0=0 Quick Tips when issuing AT Commands AT Command Set/Type Example Command Description Modem Result Codes Changing S Register Values Viewing S Register Values Storing Phone Numbers Non-Volatile MemoryDialing Stored Phone Numbers AT&Zs=n Helpful Hints for PC Computers Saving Settings and User Profiles AT Command Description Default Modem Settings for PC’sZyXEL Serial/Parallel I/O Card Helpful Hints for Macintosh Computers Special AT Command Settings for MacintoshMacintosh Serial Port Mac Software Tips Helpful Hints for UNIX-Based Computers Basic Modem Settings for UnixSerial Cable Unix Software Tips 25bis Command Set Synchronous Mode OperationSynchronous Mode Operation Clock Options Syntax Command with Description Parameters RTS Options Dialing from Synchronous Mode Command State OptionsSync AT&M1 Data Auto-Answer Answering from Synchronous ModeManual Answer Synchronous Mode Operation Line Type Setting Connecting to a Leased LineAT-Command Description Leased Line Operation Leased Line Handshaking Power Level SettingManual Connect Auto Handshake Dial Backup Leased-Line Dial BackupAT*M0 AT*M1 Aborting from Leased-Line Operation Terminating a Leased Line Connection Security Functions Special FunctionsLevels of Security Special Functions User Passwords Enters the callback number Command Function AT*Rab Remote ConfigurationAT*Wab Caller Number Delivery Caller ID Ring Here is an example Distinctive Ring Type Bit Ring Sequence Extended Distinctive Ring EDR Special Functions S51 Bit-mapped register default Bits Bin Dec Description Setting Up EDR CID/EDR RD EDR Application Example Special Functions Special Functions Modem as Fax Machine Fax OperationFax Operation Defining the Fax Command Sets Fax Command setsITU-T T.30 Fax Protocol Command Value Description Class 1 Command Set +FTH and +FRH support value 3 V.21 ch / 300 bps only Class 2 Command Set Value Command Syntax Description+FCIG=string Ln,df,ec,bf,st +FDCC=vr,br,wd +FDIS=vr,br,wd,l +FDCS=vr,br,wdDf,ec,bf,st +FDR +FLID=string +FK+FMDL? +FMFR? Response Value Function and Description +FREV?+FCFR +FVOICE +FPOLL +FBS? Class 2.0 Command Set+FCC=vr,br,w +FCO +FDT +FLI=string +FIS=vr,br,wdTpr,idr,nsr +FPI=string +FNS=stringDCE +FRQ=pgl,cbl +FCICSI ID HEX +FNC A0-BFNSC FIF +FNF NSS FIF +FNS+FPI CIG ID Extended Fax AT Command Set Modem will wait for DC2 at the beginning of every No Dial #PstringTone No Carrier Busy Snnnn Field DescriptionPstring Flow Control Fax Reception from a BBS String Error LevelConnect Init AT&FX7S0=1#B1+FCLASS=6 ExtrnMail ZyXEL errorlevel Basic AT Command Set AT Command Set SummariesCommand Options Function & Description AT Command Set Summaries Command Options Function & Description UPX Link Status Report output appears as follows Description of ATI2 Output Output Parameter Output Value Description Data Type Description DTE DTE/DCE Extended AT& Command Set Command Options Function & Description Command Options Function & Description Command Options Function & Description Command Options Function & Description Command Options Function & Description Extended AT* Command Set Command Options Function & Description Command Options Function & Description Status Registers & Result Codes Command Function & Description +RefRegister Descriptions Basic S-Registers ATSn=x Extended S-Registers ATSn=x Command Bit Dec Hex Function and description Command Bit Dec Hex Function and description Command Bit Dec Hex Function and description Command Bit Dec Hex Function and description Command Bit Dec Hex Function and description ATX1 ATX2 ATX3 ATX4 Command Bit Dec Hex Function and description Command Bit Dec Hex Function and description Command Bit Dec Hex Function and description Command Bit Dec Hex Function and description ATA Command Bit Dec Hex Function and description Command Bit Dec Hex Function and description Command Bit Dec Hex Function and description Command Bit Dec Hex Function and description Command Bit Dec Hex Function and description Command Bit Dec Hex Function and description Register bit number, b, used in ATSr.b=n ATSr.b=? ATXn Result Code Option Table Result Code Options+nnn Supported Result Code Field Descriptions Connect Strings for Error Corrected ConnectionsField Name Possible Values Numerical Verbose 24000 Status Registers & Result Codes Diagnostics Diagnostics & TroubleshootingDiagnostics & Troubleshooting Power-On Self Test FR Calibration Loopback Tests Indicator Lights Line Condition Status Display Received Signal Power Level RX Link Status Report ATI2 Characters sent from the DTE to the modem for transmission Data bytes sent to the remote modem ∙ Local Hang-up ∙ Remote Hang-up ∙ Carrier Lost ∙ On Line AT Command Set Problems Trouble Shooting Your modem fails to execute AT commands Answer Problems Command Echo Problems Dialing Problems Connect Problems Data Transfer Problems Upgrading by Flash Eprom Upgrading Your ModemType ATUPXenter Upgrading Your Modem Kernel Recovery Mode Terminal Blocks Terminal PinoutsTIP Terminal Pinouts PC Serial Port Pinouts Pin/Signal Direction DescriptionSigna Name Mac Modem Description Din Macintosh Serial Port Pinouts Terminal Pinouts Index Index Smartdrv