User manual
Contents
1. The G 703 port s receiver sensitivity thus port range may be changed either 12dB 50m or 43 dB 2000m 3 7 3 7 Test loopbacks The test loopback are useful to diagnose the network problems Two kinds of loopback are available towards DSL packets received from the G shdsl line are sent back toit towards PCM packets received from the G 703 port are sent back toit 38 3 8 Consolethroughput Different console port throughputs may be chosen 9600 19200 or 38400 bps Be sure to set the same throughput on the modem and the PC 3 9 Language selection After pressing Enter the language used on the LCD and the serial console may be changed 3 10 Write configuration to EEPROM Every change to the configuration will be lost after reboot or power off unless the settings are written to the EEPROM After reaching this option just press Enter to save them 3 11 Connection reset After pressing Enter the G shdsl link will be disconnected and negotiated again 3 12 Modemreset After pressing Enter the whole modem is rebooted If some settings were not saved to the EEPROM they will be lost 3 13 Line parameters The Esc button returns to the main screen with modem type throughput and link state While having this screen displayed you may press Enter to display line attenuation in dB proper value appears2. USER MANUAL G shdsl modem with G 703 interface TAHOE 671 TAHOE FREEDOM OF COMMUNICATION TABLE OF CONTENTS 1 Introduction ccccccceccececcsceccsceccsceecsceececaesceacscarscearsearseeavecs 1 ZEE lt lt 2 3 Modem configuration using builtin keyboard and LCD 4 4 Configuration using serial console 10 5 Technical data eu nu GA 12 6 Declaration of Conformity an se 13 a I Tahoe 671 G shdsl G 703 modem User Manual http www tahoe group com Firmware version 1 2 6 2004 Tahoe All rights 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 1 Introduction Thank you for purchasing the Tahoe 671 modem We did our best to ensure highest reliability and performance of our products Devoting many years of research and development we are proud to provide a superior quality device unfolding new possibilities for the use of the copper lines Tahoe 671 is a G shdsl modems allowing data transmission with speeds up to 2048 kbps over a 2 wire line Thanks to powerful TCPAM 32 modulation throughputs and ranges are much higher than using HDSL technique
3. TCPAM 16 modulation is also available to provide compatibility with other manufacturers products The modem is equipped with a G 703 interface that may work in both framed or unframed mode In the first case only selected timeslots may be transmitted over long lines where the throughput of 2048 kbps cannot be achieved The modem may be managed using a built in LCD and keyboard using a serial console or remotely through the DSL line The system firmware is stored in the Flash memory it is possible to update it through the serial console The configuration is stored in the EEPROM memory 2 Interfaces EE Following connectors are found on the rear panel of the modem serial G 703 power power console connector switch I U cz El 2 1 G shdsl EET It is a 6 pin RJ 11 connector used to connect the leased line The line should be connected to the two central pins 3 and 4 The polarization of a line is not important G shdsl Pin Function 1 2 3 line 4 line 5 6 2 2 Serial console The RS 232 serial console is used for modem management It has a DB9 M connector and works as a DTE i e a null modem cable should be used to connect it to a PC Only three lines written in bold are necessary for transmission Terminal settings are 9600 bps 8 data bits 1 stop bit no parity no handshaking Pin Name Descri
4. only after the line synchronizes Pressing Enter again will show so called Noise Margin or Signal Noise Ratio This is the difference between the useful signal and the background noise It may be used to estimate how much the line 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 7 8 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 throughput Pressing Enter again will return to the main screen with the throughput and modem state 4 Modem configuration using the serial console After connecting the converter to a PC running a VT 100 terminal emulation software and switching the modem on a menu will appear main menu G 703 port state DSL parameters DSL state Line rate 2048 kb s u Link state Modem type Slave HTU R Line attenuation 4 2 G shdsl line coding 32 TCPAM Noise margin 19 5 dB CRC4 checksum on 0 703 port no carrier 0 703 line coding 0 703 port range Loophack Console port speed Language Save settings to EEPROM Manage remote moden k reset at Nov 15 17 24 05 CET 2003 0 Ad i 80 00 Tahoe 671 G shdsl 0 703 booting Ad 00 00 01 Transceiver A booting A
5. 1000 6 1 2002 o EN 61000 6 3 2002 Signed Piotr Kaczmarzyk Position Director Signature SD ta Date 2 Feb 2004 Place Wroclaw Poland TAHOE Uniwersytecka 1 50951 Wroctaw Poland phone 48 50 100 7362 fax 48 71 344 2642 http www tahoe group com
6. 128 2048 kbps range In the framed mode the first number depicts the DSL line speed while the second one a sum of G 703 timeslots used for transmission It is 64 kbps lower than the first one because the DSO synchoronization timeslot is also being transmitted over the DSL line while it is not used for the data transmission over the G 703 link When the throughput is set to 2048 kbps 1984 and up button is pressed the letters unfr will appear in the brackets It means that the unframed mode is enabled and whole 2048 kbps are used for data transmission In the framed mode the selection of G 703 timeslots used for data transmission is done automatically depending on the throughput set Timeslots 0 synchronization and 16 signaling are selected first then the subsequent timeslots from 1 to 15 and from 17 to 31 Throughput Timeslots used 128 kbps 0 16 192 kbps 0 1 16 256 kbps 0 1 2 16 1024 kbps 0 1 2 3 13 14 16 1088 kbps 0 1 2 3 13 14 15 16 1152 kbps 0 1 2 3 13 14 15 16 17 1984 kbps 0 1 2 3 28 29 30 2048 kbps 0 1 2 3 28 29 30 31 NOTE Thesame throughput must be set on both modems eI gt 3 2 Modem type After pressing Enter the modem type may be selected either Master HTU C or Slave HTU R After selecting thetype and pressing Enter again the connection will be reset and renegotiate
7. d 00 00 16 Transceiver A initialized Ad 00 00 16 Transceiver B self test successful fd 00 00 16 System Enable Remote Site Ad 00 00 47 ActivationMonitor Link is UP log containing most important time elapsed since firmware version information about modem status power on or reboot and compilation date Up and down arrows may be used to navigate through the menu Either Enter or right arrow should be pressed to select an option To confirm a changed parameter press Enter To cancel a parameter change press left arrow All options are identical to the LCD options described in point 3 However two options were added Manage remote modem and Refresh screen 4 1 Manage remote modem It is possible to manage the remote modem through the DSL line First the modems must reach the synchronized state Then after selecting this option modems will establish a connection in so called Embedded Operations Channel EOC separate from the main data channel A blinking message will appear on the top of the screen informing thatthe connection was made Now allthe options on the screen concern the remote modem They may be changed and stored tothe EEPROM The Manage remote modem option will change to Return to local modem Selecting it will cease the remote management 4 2 Refresh screen When a working converter is connected to the PC s serial port the screen contents may be incomplete selecting t
8. d 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 example above means the number of values encoded in one symbol 32 5 bits per symbol The higher this number is the lower is the signal frequency which gives better immunity for signal attenuation and higher reach The second part PAM or TCPAM means either the Pulse Amplitude Modulation or Trellis Coded Pulse Amplitude Modulation The latter is more efficient It is recommended to use the 32 TCPAM modulation which provides the best results The remaining line codings are available to provide compatibility with others manufacturers equipment The 32 TCPAM allows throughputs from 256 kbps to 2048 kbps while 16 TCPAM from 128 kbpsto 2048 kbps The Auto setting forces use of 32 TCPAM for speeds higher than or equal to 256 kbps per line and 16 TCPAM for lower rates 3 4 CRC4 checksum After pressing Enter the CRC4 transmission and checking may L beeither enabled or disabled 3 5 G 703coding The G 703 port may use one of two available codings HDB3 and AMI The first one is used in most cases the second one is provided for compatibility only 36 3 6 G 703 receiver sensitivity and range
9. his option or pressing Ctrl L will refresh the screen 5 Technical data processor Motorola MC68302 o G shdsl interface connector RJ 11 standards ITU G 991 2 G shdsl ITU G 994 1 G hs modulations TCPAM 32 TCPAM 16 TCPAM 8 TCPAM 4 PAM 16 PAM 8 PAM 4 PAM 2 throughput 128 2048 kbps G 703 interface framed according to G 704 or unframed balanced 1200 RJ 45 connector throughput 64 1984 kbps or 2048 kbps line coding AMI HDB3 signaling FAS CCS CRC4 receiver sensitivity 12 dB 43 dB range 50m 2000 m serial console RS 232 DB9 M connector dimensions 200 mm width x 45 mm height x 130 mm length power supply 15V 230 mA 3 5W external power supply included o environmental conditions storage temperature 20 C to 65 C humidity 5to 95 operation temperature 0 C to 40 C humidity Oto 85 6 Declaration of Conformity TAHOE Piotr Kaczmarzyk ul Uniwersytecka 1 50 951 Wroclaw Poland We declare that the product Tahoe 671 complies with the regulations of the following European Directives o 73 23 EEC low voltage safety requirements o 89 336 EEC EMC requirements o 99 5 EEC radio amp telecommunication terminal equipment requirements The compliance of Tahoe 671 with the requirements ofthe above mentioned directives is ensured by complete application of the following harmonized European Standards EN 60950 2000 o EN55022 1998 o EN 6
10. hronized o SYNC line synchronized data may be transmitted The G 703 link status is described using two letters in the upper right corner of the LCD In case of unframed mode letters UC may appear Letter U signals the unframed mode and C means that the carrier signal was detected In the case of unframed mode letters SC may appear there Letter S means that the modem is synchronized to the E1 stream Letter C again signals that the carrier was detected If only C is displayed then the G 703 signal is present but the converter is unable to synchronize to it Perhaps the signal detected is an unframed signal 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 O speed setting modem type setting Master Slave line modulation selection o setting G 703 port line coding sensitivity and range testloopbacks o consolethroughput language selection storing settings in the EEPROM memory connection reset modem reset Each pressing of the Escape button causes the return to the min primary display with modem type and state Pressing of the Enter button selects given menu option 3 1 Throughput setting After pressing Enter the throughput may be set using up down buttons It may be chosen from
11. ption 1 DCD carrier detect transmission readiness signaling 2 RXD data received from the PC 3 TXD data sent by the modem to the PC 4 DTR active when the PC is switched on 5 GND signal ground 6 DSR active when the modem is switched on 7 RTS used by the PC to inform that is has data to send 8 CTS used by the modem to permit data transmission 9 RI ring indicator signal used in telephone modems iw _ 2 3 G 703 The G 703 port has a RJ 45 connector The G 703 standard doesn t specify the connector pinout but the pinout used in Tahoe devices is the most common in the industry thus in most cases a regular straight patch cord may be used to connect the card to the external device Anyway the pinout should be carefully checked before connecting the DCE device The RX pin of the card should be connected to the TX pin of the other device the RX pin to the TX pin TX to RX and TX to RX Tx COIN DD OB Wl N T 3 Modem configuration using built in keyboard and LCD The easiest way to configure a modem is to use the four button keyboard and the LCD After switching the power on an information about the modem type the line throughput and state will be displayed Four letter code in the bottom right describes the DSL line state o BOOT booting of the G shdsl transceiver o IDLE transceiver inactive o DOWN transceiver active line not sync
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