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FREEDOM OF COMMUNICATION

U

SER

M

ANUAL

G.shdsl+ modem with built-in router

TAHOE 681 / 682

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Summary of Contents for 681

Page 1: ...FREEDOM OF COMMUNICATION USER MANUAL G shdsl modem with built in router TAHOE 681 682 ...

Page 2: ......

Page 3: ...1 2 Interfaces 3 3 Modem configuration using built in keyboard and LCD 5 4 Configuration using telnet or serial console 10 4 1 Telnet connection 10 4 2 Serial console 10 4 3 Commands 11 5 Technical data 29 6 Declaration of Conformity 30 ...

Page 4: ...reserved Other trademarks of other companies are used only for explanation and to the owner s benefit without intent to infringe Tahoe assumes no responsibility for any errors or omissions that may appear in this document Tahoe makes no commitment to update the information contained here and may make changes at any time without notice ...

Page 5: ...ilt in TCP IP router and an Ethernet 10 100Base T interface allowing connection directly to a LAN Router software supports IP ARP TCP UDP and ICMP protocols It is manageable using telnet SNMP serial console or built in LCD and keyboard Traffic statistics are available through WWW Modem status messages can be sent to a central server using syslog protocol One network interface may support more than...

Page 6: ... IP addresses TCP or UDP ports and protocols appearing in the received packets The system firmware is stored in the Flash memory it is possible to update it using the TFTP protocol The configuration is stored in the EEPROM memory ...

Page 7: ...works as a DTE i e a null modem cable should be used to connect it to a PC Three lines bolded are sufficient Terminal settings are 9600 bps 8 data bits 1 stop bit no parity no handshaking 2 2 2 Pin Name 1 DCD 2 3 4 5 6 RXD TXD DTR GND DSR Description carrier detect transmission readiness signaling data received from the PC data sent by the modem to the PC active when the PC is switched on signal g...

Page 8: ...ould be connected to a Ethernet switch or a hub using a straight patch cord or to a PC a router or an uplink port in a switch using a crossed over one After connecting a LED named LAN Link should be lit In the Tahoe 681 682 modems the FastEthernet interface has following status LEDs LAN Link lit when modem is connected to a LAN LAN Act LAN activity blinks when data is sent or received 10 100M LAN ...

Page 9: ...e transmitted In case of Tahoe 682 modem the top code describes the first line while the bottom the second one On the right of the display there is a keyboard with up down Escape and Enter keys By pressing up down buttons you may browse the configuration menu speed setting modem type setting Master Slave line modulation selection storing settings in the EEPROM memory setting the IP address and net...

Page 10: ...m type After pressing Enter the modem type may be selected either Master HTU C or Slave HTU R After selecting the type and pressing Enter again the connection will be reset and renegotiated with new settings NOTE Always one modem has to be set as a Master and the other one as a Slave 3 3 Line coding After pressing Enter the G shdsl line coding signal modulation may be chosen The number 32 in the e...

Page 11: ...aching this option just press Enter to save them 3 5 IP address and network mask on eth0 interface As a factory default the Ethernet interface of the modem has the IP address set to 10 0 0 1 and the network mask to 255 0 0 0 After connecting to this address using telnet further configuration can be done The IP address may be changed however using the keyboard It s useful when the IP address has be...

Page 12: ...ter the whole modem is rebooted If some settings were not saved to the EEPROM they will be lost 3 9 Bridge mode This option enables or disables the bridge mode in which two interconnected LANs create one whole in the hardware layer Three settings are available off regular TCP IP routing on bridge enabled but the modem is still available under its IP address and thus may be managed remotely transpa...

Page 13: ... rate may be increased without causing any problems with the synchronization When the NMR is less than 0 dB modems will be unable to bring the link up It is the best practice to keep the NMR equal to or higher than 5 dB so the error rate will be unnoticeable Otherwise the packets will be lost due to bit errors and the retransmission would be necessary thus decreasing the overall effective throughp...

Page 14: ...l appear User Access Verification Password The default password is Tahoe case sensitive If the password entered is correct a command prompt will appear Tahoe 4 2 Serial console If the telnet connection is not possible e g there s no telnet client available or the modem s IP address is unknown the modem may be connected to the PC s serial port using a null modem cable After starting a terminal soft...

Page 15: ...may be disabled using the ifconfig command If it is disabled only those stations may connect to the modem whose IP and MAC addresses are entered into the ARP table using the arp add command This way an unauthorized network access may be prohibited 4 3 3 bridge The bridge command enables or disables the bridge mode in which two interconnected LANs create one whole in the hardware layer The stations...

Page 16: ...ory defaults Until the reboot it will continue to run with its current settings which can be saved again using write command 4 3 5 config The config command displays current configuration The command output may be entered on another modem to make an exact copy of the configuration 4 3 6 console This command is used to enable or disable password the protection of the serial console By default the c...

Page 17: ...requests and replies between separate networks The DHCP and BOOTP protocols work only within one physical subnet The station using such protocols doesn t know its IP address yet so its packets cannot be routed to other networks Relay Agent listens for such requests and forwards them to a DHCP server which may be placed anywhere in the network 4 3 7 1 Review of the settings Entering dhcp alone disp...

Page 18: ...ay be modified or deleted later on the beginning a network for each interface should be created in each of the networks an IP subnet should be created according to IP subnets connected to that interface modem may not have the routing set up to each of them it s enough that they are in the same physical network now IP ranges and static IP entries may be added 4 3 7 3 dhcp on off relay DHCP BOOTP se...

Page 19: ...igured subnets Only this IP address will be assigned to the given MAC address dhcp add host server 00 50 13 2e 15 ca 10 0 0 5 dhcp add range start address end address Adds an IP address range from which addresses will be assigned to the network stations The address range must be contained inside one of the subnets dhcp add range 10 0 0 5 10 0 0 37 dhcp add option option value Adds a global DHCP op...

Page 20: ...tes a DHCP server address used in the Relay Agent mode dhcp del range start address end address Deletes an IP address range assigned to the network stations dhcp del option name value Deletes a global option Besides the option name its value should also be given because some options may have more than one value e g domain name servers routers etc 4 3 7 6 dhcp rename The command changes the name of...

Page 21: ...hcp network max lease time value A station may request other lease time the negotiated time may not be higher than this setting 4 3 7 8 dhcp default lease time value dhcp max lease time value These commands are similar to those described in the previous paragraph but their meaning is global 4 3 8 dsl This is a group of commands used to configure the DSL link Following options are available dsl fr ...

Page 22: ...to 2304 kbps The auto setting forces use of TCPAM32 for speeds higher than or equal to 256 kbps per line and TCPAM16 for lower rates dsl reset resets the DSL connection the synchronization is performed from the beginning Entering dsl alone displays current settings 4 3 9 exit quit The command closes the configuration session and disconects from the modem 4 3 10 fr A group of commands used to confi...

Page 23: ...0 1 eth0 2 etc VLAN networks LAN networks separated from each other although using the same cabling eth0 1 0 eth0 1 1 etc VLAN interface aliases fr1 fr2 etc Frame Relay PVCs the number after fr is the DLCI of a given PVC ppp0 PPP interface used when the DSL link works in the PPP mode wan0 HDLC interface used when the DSL link works in the Cisco HDLC mode This command has similar syntax as the Linu...

Page 24: ...ist displays current settings ipchains flush removes all entries from the list After the add insert or del option following parameters should be given s source subnet netmask port range Defines the source addresses which this entry concerns If this parameter is omitted then the entry concerns all source addresses d destination subnet netmask port range Defines the destination addresses which this ...

Page 25: ...e whole 215 16 11 0 24 subnet except the 215 16 11 5 address More examples ipchains add d 0 0 0 0 0 80 80 p tcp deny Inhibits access to the port 80 on all external servers ipchains add s 192 168 0 0 16 masq Enables masquerade for the 192 168 0 0 16 subnet other addresses are passed unchanged 4 3 14 lang Selects the language used to display messages during the telnet or console connection and on th...

Page 26: ...ial characters may be used in the text displayed They will be replaced by appropriate values t modem type e g Tahoe 681 s total line throughput 1 first line state e g SYNC 2 second line state Tahoe 682 only 4 3 16 masq The masq command displays a list of masqueraded connections The list consists of source and destination addresses the port assigned by the modem the time remaining to the removal of...

Page 27: ...ote router ppp port mru value sets the maximum packet size that the router will accept to receive ppp port ip local address remote address sets the IP addresses used during the PPP connection negotiation ppp port up1 command ppp port up2 command ppp port up3 command ppp port up4 command the up1 to up4 options allow execution of up to four commands after the PPP link is established ppp port down1 c...

Page 28: ...te add net address netmask network mask interface adds the route to a subnet with given address and network mask directly through a specified interface route add net address netmask network mask gw gateway adds the route to a subnet with given address and network mask through a specified gateway route add default gw address adds the default route through a given gateway route del address removes r...

Page 29: ...ode by typing strictarp on and entering the static IP MAC assignments using arp add the modem would listen to incoming ARP requests asking for the addresses it has in its static table If the request comes from another MAC address than in the modem s ARP table it will send an answer with the correct MAC address Such request is sent by the PCs working under the Microsoft Windows operating system dur...

Page 30: ... host IP address if the server is enabled the access to it may be limited to a certain IP address If this address is set to 0 0 0 0 then the access isn t limited 4 3 29 timeout The command sets the inactivity time in seconds after which the telnet connection is closed It has following syntax timeout during the session during logging in The first parameter is used after the logging in and the secon...

Page 31: ...l access to the device read only permits only reading of the configuration and the statistics user mode single multi selects the working mode to either single or multi user 4 3 32 ver Displays current firmware version 4 3 33 watchdog The watchdog command gives additional control over the modem s unpredicted behavior i e a misconfiguration disabling further communication with the modem The modem us...

Page 32: ...or for any of the pings sent to the second address then the modem is rebooted 4 3 34 write Saves the current configuration to the EEPROM and displays an information about the EEPROM usage If the configuration is to large to be stored some settings should be deleted like static ARP entries DHCP options etc 4 3 34 ...

Page 33: ...G 994 1 G hs modulations TCPAM 32 TCPAM 16 TCPAM 8 TCPAM 4 PAM 16 PAM 8 PAM 4 PAM 2 throughput Tahoe 681 64 4864 kbps Tahoe 682 128 9728 kbps Ethernet interface 10 100Base T RJ 45 connector serial console RS 232 DB9 M connector dimensions 200 mm width x 45 mm height x 130 mm length power supply Tahoe 681 15 V 260 mA 3 5W Tahoe 682 15 V 360 mA 5W external power supply included environmental conditi...

Page 34: ...e mentioned directives is ensured by complete application of the following harmonized European Standards EN 60950 2000 EN 55022 1998 EN 61000 6 1 2002 EN 61000 6 3 2002 Signed Piotr Kaczmarzyk Position Director Signature Date 30 Apr 2004 Place Wroclaw Poland 2004 Tahoe All rights reserved Other trademarks of other companies are used only for explanation and to the owner s benefit without intent to...

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Page 36: ... TAHOE Uniwersytecka 1 50951 Wroc aw Poland phone 48 50 100 7362 fax 48 71 344 2642 http www tahoe group com ...

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