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P841C Central-Side VDSL Modem

Troubleshooting

6-3

Table 6-6 Troubleshooting Connecting to an Ethernet Switch

STEPS CORRECTIVE

ACTION

Speed: Auto

Duplex: Auto

Flow control: On for full duplex and off for half-duplex

If the P841C’s auto-negotiation is turned off, an Ethernet port uses the pre-configured speed and duplex
mode when making a connection, thus requiring you to make sure that the settings of the switch Ethernet
port are in the same order to connect.

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Summary of Contents for P841C

Page 1: ...P841C Central Side VDSL Modem May 2002 Version 1 00 User s Guide ...

Page 2: ... of ZyXEL Communications Corporation Published by ZyXEL Communications Corporation All rights reserved Disclaimer ZyXEL does not assume any liability arising out of the application or use of any products or software described herein Neither does it convey any license under its patent rights nor the patents rights of others ZyXEL further reserves the right to make changes in any products described ...

Page 3: ...ged by an act of God or subjected to abnormal working conditions Note Repair or replacement as provided under this warranty is the exclusive remedy of the purchaser This warranty is in lieu of all other warranties express or implied including any implied warranty of merchantability or fitness for a particular use or purpose ZyXEL shall in no event be held liable for indirect or consequential damag...

Page 4: ...s are designed to provide reasonable protection against harmful interference in a commercial environment This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instruction manual may cause harmful interference to radio communications Operation of this equipment in a residential area is likely to cause harmful interference in which ...

Page 5: ...l com WORLDWIDE sales zyxel com tw 886 3 578 2439 ftp europe zyxel com ZyXEL Communications Corp 6 Innovation Road II Science Based Industrial Park HsinChu Taiwan 300 R O C support zyxel com 1 714 632 0882 800 255 4101 www zyxel com NORTH AMERICA sales zyxel com 1 714 632 0858 ftp zyxel com ZyXEL Communications Inc 1650 Miraloma Avenue Placentia CA 92870 U S A support zyxel dk 45 3955 0700 www zyx...

Page 6: ...nel 2 1 2 2 Back Panel 2 1 Chapter 3 Configuring the P841C 3 1 3 1 Additional Installation Requirements 3 1 3 2 Login Screen 3 1 3 3 Commands 3 2 3 4 System Related Commands 3 2 Chapter 4 VDSL Related Commands 4 1 4 1 Introduction 4 1 Chapter 5 Ethernet related Commands 5 1 5 1 Introduction 5 1 Chapter 6 Troubleshooting 6 1 6 1 VDSL LED 6 1 6 2 Data Transmission 6 1 6 3 Intermittent VDSL LED 6 2 6...

Page 7: ...mand 3 5 Figure 3 8 Upgrading Firmware First Warning 3 5 Figure 3 9 Upgrade Firmware Last Warning 3 6 Figure 3 10 Example Xmodem Upload 3 6 Figure 4 1 VDSL Mode 4 1 Figure 4 2 VDSL Upstream Rate 4 2 Figure 4 3 VDSL Downstream Rate 4 3 Figure 4 4 VDSL Auto Flag 4 3 Figure 4 5 VDSL Status Example 4 4 Figure 4 6 VDSL Initialization Messages 4 6 Figure 4 7 VDSL Monitor 4 6 Figure 4 8 VDSL Show Command...

Page 8: ...requency Ranges and Rates 4 2 Table 4 4 VDSL Rates 4 3 Table 4 5 VDSL Status Counters 4 5 Table 4 6 VDSL Show Command 4 7 Table 5 1 Ethernet Status Counters 5 2 Table 5 2 Enet Monitor Statistics 5 4 Table 6 1 Troubleshooting the VDSL LED 6 1 Table 6 2 Troubleshooting Data Transmission 6 1 Table 6 3 Troubleshooting a Non Constant VDSL LED 6 2 Table 6 4 Troubleshooting the SYNC rate 6 2 Table 6 5 Tr...

Page 9: ...one companies It maps one Ethernet link to one VDSL link effectively extending Ethernet service up to 1 5km The Prestige 841C attains speeds ranging from 1 56 Mbps to 16 67 Mbps upstream and 4 17 Mbps to 16 67 Mbps downstream at distances of up to 1 5 Km 5 000 feet over ordinary telephone lines General Syntax Conventions Enter means for you to type one or more characters and press the carriage ret...

Page 10: ......

Page 11: ...gnals 10 100 Mbps Fast Ethernet Port The 10 100 Mbps Fast Ethernet port allows you to connect it to a LAN switch VDSL Modes and Rates The P841C supports the following DSLAM VDSL modes 10BaseS mode giving upstream rates from 1 56 Mbps to 18 75 Mbps and downstream rates of 4 17 Mbps Kbps to 16 67 Mbps ANSI Mode giving upstream rates from 1 56 Mbps to 6 25 Mbps and downstream rates of 4 17 Mbps to 16...

Page 12: ...P841C Central Side VDSL Modem 1 2 Getting to Know the P841C Figure 1 1 Campus Application ...

Page 13: ... 10 M Green Blinking ON OFF The system is transmitting receiving to from a 10 Mbps Ethernet network The link to a 10 Mbps Ethernet network is up The link to a 10 Mbps Ethernet network is down LAN 100 M Yellow Blinking ON OFF The system is transmitting receiving to from a 100 Mbps Ethernet network The link to a 100 Mbps Ethernet network is up The link to a 100 Mbps Ethernet network is down VDSL Gre...

Page 14: ... pin end of the console cable to the console port of the P841C Connect the other end either a female 25 pin or female 9 pin to a serial port COM1 COM2 or other COM port of your computer You can use an extension RS 232 cable if the enclosed one is too short VDSL Connect one end of a phone cable to the RJ 11 VDSL port and then connect the other end to the telephone wall jack that connects to the sub...

Page 15: ...urn on your P841C it performs several internal tests as it initializes A login screen appears with copyright and VDSL information prompting you to enter the password as shown in the next figure You need a password to configure the P841C The default password when the P841C is shipped is 1234 Figure 3 1 Login Screen For your first login enter the default password 1234 As you enter the password the s...

Page 16: ...tional fields parameters in a command are enclosed in brackets For example P841C vdsl active on off The symbol is shorthand for the word or For example vdsl debug on off 3 4 System Related Commands Help exit passwd sys and fwupgrade are the system related commands 3 4 1 Passwd Command passwd Use this command to change the login password The default password when shipped is 1234 Figure 3 4 Change P...

Page 17: ... system status help or show this screen exit logout passwd change login password fwupgrade upgrade firmware vdsl uprate x set show VDSL uprate vdsl downrate y set show VDSL downrate vdsl auto on off set show VDSL auto rate selection flag vdsl load lt nt load VDSL modem code vdsl reset reset VDSL chip vdsl reconnect force VDSL reconnect vdsl status show VDSL connect status vdsl clear clear VDSL con...

Page 18: ...and to cause the P841C to reconnect the VDSL link vdsl status Issue this command to show the VDSL connection status vdsl clear Issue this command to clear the VDSL connection status counters vdsl debug on off Type this command to show the VDSL debug flag status without on or off or turn on off the VDSL debug flag When this flag is set on VDSL debug messages are displayed vdsl monitor on off Type t...

Page 19: ...sion This field shows the P841C firmware version and the date it was created vdsl modem code version This field shows the VDSL driver version sys uptime This field displays in milliseconds and hours minutes seconds how long the system has been up 3 4 5 Firmware Upgrade Command fwupgrade Follow these steps for a successful firmware upgrade Step 1 Type fwupgrade to begin the firmware upgrade process...

Page 20: ...s If you abort the upload after the transfer begins your device will be seriously damaged Example Xmodem Firmware Upload Using HyperTerminal Click Transfer then Send File to display the following screen Figure 3 10 Example Xmodem Upload Choose the Xmodem protocol Finally click Send Type the firmware file s location or click Browse to look for it The firmware file has a bin extension You MUST NOT a...

Page 21: ... VDSL Mode Command vdsl mode mode This command displays the VDSL mode if you don t type a mode and sets it if you do Use the vdsl reset or vdsl recon command to make VDSL reconnect after you set the mode it does not do this automatically The modes are listed in the next table Figure 4 1 VDSL Mode Table 4 2 VDSL Mode MODE NUMBER MODE TYPE 0 10BaseS mode 1 ANSI Mode ANSI ETSI Band Plan 998 2 ETSI Mo...

Page 22: ...mands Use the following commands to view and set VDSL upstream and downstream rates Rates vary according to VDSL mode selected see Table 4 4 and section 4 1 1 Upstream Rates vdsl uprate uprate uprate is an integer from 0 to 4 as defined in the next table This command sets the upstream VDSL rate if you set a rate and displays the rate if you don t If you set a new rate you must use vdsl reset or vd...

Page 23: ...bps ETSI Mode ETSI Band Plan 997 0 1 56Mbps 4 17Mbps 1 3 13Mbps 6 25Mbps 2 6 25Mbps 9 38Mbps 3 12 50Mbps 4 1 4 VDSL Auto Command vdsl auto on off This command turns the VDSL auto flag on or off Type vdsl auto to show the current VDSL auto flag status without on or off When this flag is on the P841C automatically negotiates upstream and downstream rates up to the values set using the upstream and d...

Page 24: ...as shown in the next example Information in these fields is mainly for debugging purposes SNR MSE and RS_ERR are polled every three seconds Total RS_ERR are counted during the connection SNR MSE RS_ERR and Total_RSERR are cleared after the VDSL is link up Figure 4 5 VDSL Status Example P841C vdsl status VDSL Parameters LINK_STAT 0x00 DISC 0 Modem Code 0x50 N A VDSL Line Quality Status US QAM 4 Int...

Page 25: ...o is the ratio of the amplitude of the desired signal to the amplitude of noise signals at a given point in time MSE This is the Minimum Square Error The minimum mean square error also known as MMSE performance measure is a popular metric for optimal signal processing RS_ERR This is the count of bit errors detected and corrected by Reed Solomon code Reed Solomon codes are block based error correct...

Page 26: ...r 19 Goto State 2 19 State 2 Check NT EEPROM patch setup target rate 19 Remote VDSL Product Name Prestige 841 19 NT EEPROM exists 19 NT patch signature 0x55 0x51 0x32 19 EEPROM auto upgrade disabled skip upgrade check 19 Try to connect target rate US 4 DS 4 19 Write parameters to NT 23 Long Loop Set NT M_TX 1 24 Write parameters to LT 24 Goto State 3 25 State 3 Wait to connect target rate 25 Targe...

Page 27: ...s field shows the current VDSL auto flag status on or off When this flag is on the P841C will automatically negotiate upstream and downstream rates up to the values set using the upstream and downstream commands on vdsl monitor flag This field shows the current VDSL monitor flag status on or off When this flag is on and the VDSL link is up the P841C will automatically VDSL parameters every three s...

Page 28: ...full duplex flow control This field shows the P841C Ethernet port flow control status on or off on NT Ethernet speed This field shows the P841 subscriber s VDSL modem Ethernet port speed Auto NT Ethernet full duplex flow control This field shows the P841 subscriber s VDSL modem Ethernet port flow control status on or off on vdsl disconnect count This field displays how many times VDSL connection h...

Page 29: ...ine the connection speed and duplex mode If the peer Ethernet port does not support auto negotiation or turns off this feature the P841C determines the connection speed by detecting the signal on the cable and using half duplex mode When the P841C s auto negotiation is turned off an Ethernet port uses the pre configured speed and duplex mode when making a connection thus requiring you to make sure...

Page 30: ...t a frame on a particular interface FTL_ERR This counter contains the number of frames received that were more than maximum length 1536 bytes These frames are discarded FCS_ERR Frame Check Sequence Errors OTO A count of data and padding octets of frames that are successfully transmitted ORO A count of data and padding octets of frames that are successfully received BCF A count of frames that are s...

Page 31: ...umber Speed Flow Control 0 Auto Negotiation 1 10 Mbits s Half Duplex 2 10 Mbits s Full Duplex 3 100Mbits s Half Duplex 4 100Mbits s Full Duplex 5 1 4 Enet full duplex Fctrl lt nt on off Command enet full duplex fctrl lt nt on off Type this command to set the Ethernet port flow control or show the Ethernet port flow control status without on or off By default flow control is on for full duplex Ethe...

Page 32: ...ount TxB and RxB Transmitting and Receiving Byte count TxS and RxS Transmitting and Receiving Throughput in Bytes per second P841C enet monitor enet monitor flag off P841C enet mon on P841C 108 Enet LT Tx F 0 B 0 S 0 Rx F 681 B 85833 S 1950 109 Enet NT Tx F 694 B 90140 S 2709 Rx F 0 B 0 S 0 113 Enet LT Tx F 0 B 0 S 0 Rx F 815 B 117449 S 6323 114 Enet NT Tx F 828 B 119529 S 5877 Rx F 0 B 0 S 0 118 ...

Page 33: ...mains off contact the distributor 6 2 Data Transmission The VDSL LED is on but data cannot be transmitted Table 6 2 Troubleshooting Data Transmission STEPS CORRECTIVE ACTION 1 Disconnect the phone wire coming from the VDSL port of the P841C and connect the VDSL modem or router directly to the VDSL port of the P841C using a different telephone wire If data can be transmitted check for a problem wit...

Page 34: ... rates match the regular phone wire quality may be limiting the speed 2 Use the VDSL commands to reset and reconnect the VDSL channel see sections 4 1 6 and 4 1 7 3 Log into the P841C enter the VDSL status command see section 4 1 8 and the VDSL debug command see section 4 1 10 take screen shots of this information and send it to your nearest customer support representative 6 5 Password I forgot th...

Page 35: ...CTION Speed Auto Duplex Auto Flow control On for full duplex and off for half duplex If the P841C s auto negotiation is turned off an Ethernet port uses the pre configured speed and duplex mode when making a connection thus requiring you to make sure that the settings of the switch Ethernet port are in the same order to connect ...

Page 36: ......

Page 37: ...NGDOM AC Power Adapter model AD 1201200DV AC Power Adapter model AD 1201200DK Input power AC230Volts 50Hz 0 2A Input power AC230Volts 50Hz 0 2A Output power DC12Volts 1 2A Output power DC12Volts 1 2A Power consumption 6 W Power consumption 6 W Safety standards TUV CE EN 60950 Safety standards TUV CE EN 60950 BS7002 JAPAN AUSTRALIA AND NEW ZEALAND AC Power Adapter model JOD 48 1124 AC Power Adapter...

Page 38: ......

Page 39: ...ansmission 6 1 Declaration of Conformity iv Default Settings Ethernet 5 1 DISC 4 11 Disclaimer ii DS 4 11 Duplex 5 1 5 3 6 3 E enet fctrl 3 5 enet monitor 3 5 5 3 enet speed 3 5 5 3 enet status 3 4 5 1 Ethernet Switch 6 2 ETSI Mode 1 1 ETSI Plan 997 4 8 4 9 EXC_COL 5 2 Exit 3 3 F FCC iv FCC Rules iv FCS_ERR 5 2 Federal Communications Commission FCC Interference Statement iv Firmware Upgrade 3 5 Fl...

Page 40: ...nation 3 2 O ORO 5 2 OTO 5 2 P P841 1 1 P841C ix Passwd 3 2 Password 3 1 3 2 6 2 PHONE 2 2 POCO 4 11 POWER 4 11 Power Adapter A PSD 4 11 PWR 2 1 R Rear Panel Connections Rear Panel 2 2 reconnect 3 4 Related Documentation ix repair iii RS_ERR 4 11 RXBCNT 5 2 RXPAUS 5 2 S Service iii Services v SINGLE_COL 5 2 sleep mode 4 13 SNR 4 11 Splitters Integrated Splitters 1 1 SYNC rate 6 2 Syntax Convention...

Page 41: ... 1 VDSL ix vdsl active 3 2 3 4 4 8 vdsl debug 3 2 3 4 4 11 4 13 vdsl downrate 3 4 VDSL LED 6 1 vdsl mode 3 4 4 7 4 13 VDSL Mode 4 7 4 8 VDSL Modes 1 1 VDSL Rates 4 8 4 9 vdsl show 3 4 4 12 vdsl status 3 4 4 10 vdsl uprate 3 4 VT100 3 1 Z ZyXEL Limited Warranty iii Note iii ZyXEL Web Site ix ...

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