Tut Systems XL-12000B User manual

USER GUIDE
XL-12000B
High-Speed Network Modem
TUT SYSTEMS

XL-12000B
HIGH-SPEED NETWORK MODEM
TUT SYSTEMS i
Warranty Policy
Warranty Summary
This Tut Systems product is warranted against defects in material and workmanship and will substantially
conform to Tut Systems product documentation for a period of one (1) year from the date of shipment.
Y2K Compliance
The Company’s products, including separately sold software applications, are designed to be used prior
to, during, and after the calendar year 2000 and will operate during each such time period without error
relating to date data, specifically including any error relating to, or the product of, date data which repre-
sents or references different centuries or more than one century.
Tut Systems will, at its option, either repair or replace products that prove to be defective. For warranty
or repair, return this product to a service facility designated by reseller in accordance with reseller
instructions which such instructions shall be in accordance with those set forth in Tut Systems Standard
Terms and Conditions of Sale.
Limitations of Warranty
The foregoing warranty shall not apply to defects resulting from abuse, neglect by Buyer, improper
installation or application by Buyer, Buyer-supplied software or interfacing, unauthorized modification
or misuse, operation outside of the environmental specifications for the product, acts of God, or improp-
er site preparation or maintenance.
Note: No other warranty is expressed or implied by statute or otherwise, regarding the product
including their fitness for any purpose, their quality, their merchantability, non-infringement or oth-
erwise.
Exclusive Remedies
The remedies provided herein are the buyer’s sole and exclusive remedies. Tut Systems shall not
be liable for any direct, indirect, special, incidental, or consequential damages, whether based
upon contract, tort, or any other legal theory. Warranties apply only to original purchaser or end-
user and cannot be assigned or transferred to subsequent parties. Tut Systems Standard Terms
and Conditions of Sale contain the full text of the product limited warranty.
Assistance
For assistance, contact your nearest Tut Systems Sales and Service office.
FCC Radio Frequency Interference Statement
This equipment has been tested and found to comply with the limits for a computing device, pursuant to
Part 15 of FCC Rules. These limits are designed to provide reasonable protection against harmful inter-
ference when the equipment is operated in a commercial environment. This equipment generates, uses
and can radiate radio frequency energy and, if not installed and used in accordance with the instructions,
may cause harmful interference to radio communications. However, there is no guarantee that interfer-
ence will not occur in a particular installation. If this equipment does cause harmful interference to radio
or television reception, which can be determined by turning the equipment off and on, the user is
encouraged to try to correct the interference by one or more of the following measures:
1. Reorient or relocate the receiving antenna.
2. Increase the separation between the equipment and receiver.
3. The equipment and the receiver should be connected to outlets on separate circuits.
4. Consult the dealer or an experienced radio/television technician for help.

ii TUT SYSTEMS
XL-12000B
HIGH-SPEED NETWORK MODEM
Changes or modifications not expressly approved by the party responsible for compliance could void the
user’s authority to operate the equipment.
The information contained in this publication is the latest available. However, Tut Systems reserves the
right to change specifications of hardware and software without prior notice. Purchasers of Tut Systems’
products should make their own evaluation to determine the suitability of each product for their specific
application. Tut Systems’ obligations regarding the use or application of its products shall be limited to
those commitments to the purchaser set forth in its Standard Terms and Conditions of Sale for a deliv-
ered product.
Published by Tut Systems, Inc.
2495 Estand Way
Pleasant Hill, CA 94523-3911
925-682-6510
fax [phone]
www.tutsys.com
Copyright © 1998 by Tut Systems, Inc. All rights reserved.
No part of the contents of this manual may be reproduced or transmitted in any form or by any person
without written permission from the publisher.
Printed in the United States of America.
Tut Systems Manual P/N 220-03310-10 120798

XL-12000B
HIGH-SPEED NETWORK MODEM
TUT SYSTEMS iii
Contents
1.0 XL-12000B Product Overview 1
2.0 Technical Specifications 2
3.0 What’s in the Box 3
4.0 Installation 4
5.0 Panel Indicators and Connectors 7
5.1 Front Panel Indicators 7
5.2 Rear Panel Indicators and Connectors 9
6.0 Power and Boot Up Sequence 10
7.0 Troubleshooting 11
8.0 Technical Assistance and Customer Support 13
Appendix A: Pinout Assignments 14
Appendix B: Measuring Line Length 15
Figures
Figure 4.1 RJ-45 10 Base-T Straight-through Cable 4
Figure 4.2 RJ-11 DSL Line Cable 5
Figure 4.3 XL-12000B Installation with a Hub or Node 6
Figure 5.1 XL-12000B Front Panel 8
Figure 5.2 XL-12000B Rear Panel 9
Figure B.1 Using and Ohmmeter to Measure 15
the Length of Phone Wire
Tables
Table A.1 RJ-45 10Base-T Ethernet Connector 14
on Rear of Modem
Table A.2 RJ-11 DSL Line Connector on Rear of Modem 14

XL-12000B
HIGH-SPEED NETWORK MODEM
1.0 XL-12000B PRODUCT OVERVIEW TUT SYSTEMS 1
1.0 XL-12000B Product Overview
The XL-12000B modem is a high-speed, SDSL (Symmetrical
Digital Subscriber Line) point-to-point modem created to extend
Local Area Networks (LANs) up to 12,000 feet using ordinary
telephone wires. The modem uses Digital Subscriber Line (DSL)
transmission technology to deliver data at 2 Mbps.
The XL-12000B is designed for easy installation. Front panel LEDs
provide status and operational information. The modem is ideally
suited for connecting LANs in a campus environment where LANs
may be spread out over two miles. The XL-12000B units function
as a pair; one as Master and the other as Slave. The XL-12000B will
function as a bridge using Spanning Tree Protocol (STP) connecting
two independent segments. This mode allows the modem to pass
both IP and non-IP packets transparently making the segments a
single network. Examples of non-IP packets include Novell’s IPXTM
and Apple’s AppleTalkTM.

2.0 Technical Specifications
Data Rate: 2.048 Mbps
Line Length: Up to 12,000 ft. on 24 AWG wire
Up to 9,000 ft. on 26 AWG wire
Ethernet Interface: Compliant with IEEE 802.3 10Base-T
Operating Voltage: 120/240 VAC 50/60 Hz wall transformer
Power Consumption: 5 Watts
Operating Temperature: -5˚ to 55˚ C
Storage Temperature: -40˚ to +70˚ C
Relative Humidity: 5% to 90% (non-condensing)
Compliance: UL, CSA, CE, FCC Part 15 Class A
Software: Spanning Tree Protocol (STP) Bridging
(rfc-1493)
XL-12000B
HIGH-SPEED NETWORK MODEM
2TUT SYSTEMS 2.0 XL-12000B TECHNICAL SPECIFICATIONS

XL-12000B
HIGH-SPEED NETWORK MODEM
3.0 What’s in the Box
Confirm that there is one each of the following items:
Description
• XL-12000B Modem
• XL-12000B User Guide
• RJ-45 10Base-T Straight-through Cable
• RJ-11 DSL Line Cable
• Wall Transformer w/ Lightning Protection
3.0 WHAT’S IN THE BOX TUT SYSTEMS 3

4.0 Installation
1. Remove the modem and wall transformer from the shipping
carton. Remove the wall transformer from its box. Remove the
plastic wrapper from around the modem.
2. Remove the cable ties from each of the cables and place them
side by side.
Each of the cables is identified as follows:
(1) RJ-45 10Base-T straight-through cable: A cable with RJ-45
connectors is used to connect the modem to a 10Base-T
hub or node. If connecting to a node (PC, server or work-
station), the switch on the back of the modem will allow
this cable to be used like a cross-over cable (Figure 4.1).
Figure 4.1 RJ-45 10 Base-T Straight-through Cable
(2) RJ-11 DSL Line cable: A cable with RJ-11 connectors at
each end. RJ-11 connectors have four contacts and are
smaller than the RJ-45 connectors, which have eight contacts.
The diameter of the RJ-11 cable is smaller than the RJ-45
cable. This cable is used to connect the modem to the
telephone jack (Figure 4.2).
Note: RJ-11 cables generally have four contacts and six pinout
positions. The pinout assignments for the RJ-11 and RJ-45
connectors are provided in Appendix A.
XL-12000B
HIGH-SPEED NETWORK MODEM
4TUT SYSTEMS 4.0 INSTALLATION
181
2
3
6
1
2
3
6
81

XL-12000B
HIGH-SPEED NETWORK MODEM
Figure 4.2 RJ-11 DSL Line Cable
3. Select a convenient location near the Ethernet device to which
the modem will be connected. The modem should be kept away
from excessive heat or cold. Operating temperature range is
-5˚C to 55˚C.
4. Connect an RJ-45 straight-through cable from the 10Base-T
Ethernet connector of the XL-12000B to an Ethernet device (PC,
server, workstation or hub) as shown in Figure 4.3. If connecting
to a PC, server, or workstation, set the Ethernet connection
switch on the back of the modem to the “Crossed” position.
If connecting to a 10Base-T hub, set the switch to “Normal”.
5. Connect the RJ-11 DSL Line cable from the DSL connector on
the modem to the telephone jack.
6. Verify that you have a telephone line linking the two XL-12000B
modems. Verify that this line has no bridge taps and is generally
free of noise.
7. Connect the wall transformer as shown in Figure 4.3.
4.0 INSTALLATION TUT SYSTEMS 5
25
3
4
3
4
52

Figure 4.3 XL-12000B Installation with a Hub or Node.
Note: The Ethernet connection switch facilitates use with either type of device.
XL-12000B
HIGH-SPEED NETWORK MODEM
6TUT SYSTEMS 4.0 INSTALLATION
RJ-45
Straight-through
Cable
Ethernet Connection Switch
in Normal (Hub) Position

XL-12000B
HIGH-SPEED NETWORK MODEM
5.0 Panel Indicators and Connectors
This section describes the indicators and connectors on the front
and rear of the XL-12000B modem.
5.1 Front Panel Indicators
Fig. 5.1 shows the LED indicators that provide status and
operational information on the XL-12000B Modem.
Power LED
The blue Power LED remains lit while the unit has power.
Activity LEDs
The DSL RX and DSL TX LEDs flash green when receiving and
transmitting data.
Status LED
At power up, the Status LED flashes red while the modem performs
a diagnostic self-test and performs software decompression. After
the modem completes its self-test, the LED will extinguish,
indicating that the modem is ready for normal operations.
Steady red indicates one of two conditions: 1) the link is lost and
the modems are trying to establish a link or 2) there is a unit failure.
DSL Link
A flashing DSL link LED indicates that the modem is in the
process of linking to the other modem. After the two XL-12000B
units have secured the DSL link, the DSL Link LED glows a
steady green. The LED is off when there is no link.
Master/Slave Switch
One XL-12000B serves as the Master unit and the other serves as
Slave. It does not matter which unit of the pair is set to “Master”
and which is set to “Slave”, but the pair must have opposite settings.
Changing this switch does not require the user to reboot the modems.
5.0 PANEL INDICATORS AND CONNECTORS TUT SYSTEMS 7

XL-12000B
HIGH-SPEED NETWORK MODEM
8TUT SYSTEMS 5.0 PANEL INDICATORS AND CONNECTORS
Figure 5.1 XL-12000B Front Panel
XL-12000B HIGH SPEED LAN MODEM
POWER DSL RX DSL TX STATUS DSL LINK
MASTER SLAVE
DSL RX
Flashing Green : On when receiving data.
DSL LINK
Steady Green :
Normal link.
Flashing Green :
Linking
(about one minute).
Off : No link.
MASTER/SLAVE
Select one unit
of each pair as
Master and the
other as Slave.
STATUS
Flashing Red :
Power up self-test or software
download in progress.
Off : Normal condition.
Steady Red : Board failure.
Contact Tut Systems
Customer Support.
DSL TX
Flashing Green : On when transmitting data.
POWER
Blue

XL-12000B
HIGH-SPEED NETWORK MODEM
5.0 PANEL INDICATORS AND CONNECTORS TUT SYSTEMS 9
5.2 Rear Panel Indicators and Connectors
10Base-T Link LED
A green LED indicates a valid Ethernet link. When flashing, the
LED indicates traffic on the link. When the LED is off, there is no
valid link.
Figure 5.2 XL-12000B Rear Panel
Power Connection 10Base-T
Link
Green :
Indicates valid
Ethernet link.
Flashing Green :
Indicates activity.
Off : No link.
10Base-T
Ethernet Connection
To connect to a PC, server,
workstation, or hub.
DSL Connector
To the telephone
line for the remote
modem.
Ethernet
Connection
Normal :
Select Normal if
connecting to a
hub.
Crossed:
Select Crossed if
connecting to a
node (PC, server,
or workstation).
XL-12000B RJ-45 RJ-11
10BASE-T
LINK
10BASE-T
ETHERNET
ETHERNET
CONNECTION
NORMAL
CONNECT
TO HUB
CROSSED
CONNECT
TO NODE
DSL
12VDC

XL-12000B
HIGH-SPEED NETWORK MODEM
10 TUT SYSTEMS 6.0 POWER AND BOOT UP SEQUENCE
6.0 Power and Boot Up Sequence
1. Verify that the LAN and DSL lines are connected according
to the wiring diagram described in the “Installation” section
(see Figure 4.3.
2. Plug the 120 VAC/12 VDC wall transformer (220VAC for
international use) into a wall outlet. Verify that the Power (blue)
LED comes on.
3. Verify that the 10Base-T Link (green) LED on the rear panel is
illuminated. If the unit is not connected to an Ethernet (10Base-T)
source (e.g., computer), this LED will illuminate momentarily
on power-up and then extinguish. When properly connected,
the 10Base-T Link LED will be lit continuously.
4. Immediately upon power-up, the modem will begin its boot-up
routine. The Status LED flashes red as the modem cycles
through its initialization process. After initialization the DSL
link light will blink and the Status light will remain red. If the
DSL link light does not blink, refer to the “Troubleshooting”
section. If the link time takes longer than one minute, refer to
the “Troubleshooting” section.
5. The modem is now ready for operation.

XL-12000B
HIGH-SPEED NETWORK MODEM
7.0 TROUBLESHOOTING TUT SYSTEMS 11
7.0 Troubleshooting
This section is designed to assist in troubleshooting the XL-12000B.
It also describes how to reach Technical Support at Tut Systems.
Tut Systems takes pride in its products and would be more than
happy to help with problems associated with the XL-12000B.
Please take a moment and review the following answers to
commonly asked questions before calling Technical Support.
1. The blue Power LED remains off.
Verify that the wall transformer is plugged into an electrical
outlet and that the connection to the modem is secure.
Confirm the modem is plugged into a “live” electrical outlet.
Make sure no light switch controls the plug and has been
inadvertently turned off. It is not a recommended configuration
to have the modem plugged into an electrical outlet that is
controlled by a light switch.
2. The Status LED continues to stay red and the DSL link LED is
not blinking.
Try power cycling the modem by unplugging the modem and
plugging it back in.
If after power cycling the Status LED remains red, contact
Customer Support.
3. The DSL Link LED never starts blinking.
The DSL line is not plugged in or the DSL line is not properly
connected to the “remote” end. Verify that the cable is properly
connected at both ends.
Both modems have the same setting on the Master/Slave switch.
Verify by checking both modems’ Master/Slave switch on the
front panel. Make sure that one of the modems is a Master and
the other is a Slave. Check all patch cables to be sure the pinout
is correct and connections are well seated.

XL-12000B
HIGH-SPEED NETWORK MODEM
12 TUT SYSTEMS 7.0 TROUBLESHOOTING
4. The DSL Link LED blinks for a long time.
Blinking for a long time can indicate failure to communicate with
the other modem within the acceptable noise parameters or that the
distance between modems exceeds 12,000 feet. Verify the length of
the DSL line and ensure it meets the length limits described in
Appendix B. If it meets the limits, then have the line tested
for defects.
Another reason for continuous blinking is that both modems
are either Masters or Slaves. Verify by checking both modem’s
Master/Slave switch on the front panel. Make sure that one of the
modems is a Master and the other is a Slave. A Master modem
will send out a pulse on the wire to try and communicate with a
Slave modem.
5. The 10Base-T LED never illuminates.
If connecting to a hub, make sure the Ethernet connection switch on
the back of the modem is set to “Normal”. Check the hub to see that
its link light is illuminated. If the light is still not illuminated, try a
different straight-through cable.
If connecting to a PC, server, or workstation, make sure the Ethernet
connection switch on the back of the modem is set to “Crossed”.
Verify that the link light is illuminated on the PC.
If the 10Base-T cable being used was not the cable provided,
make sure it adheres to the pinout assignments for 10Base-T
(see Appendix A).

XL-12000B
HIGH-SPEED NETWORK MODEM
8.0 TECHNICAL ASSISTANCE AND CUSTOMER SUPPORT TUT SYSTEMS 13
8.0 Technical Assistance and
Customer Support
Maintenance and Repair
Tut Systems offers a comprehensive range of customer support
services, including technical assistance, installation, and maintenance
agreements. For further information and pricing on Tut’s service
products, contact your sales representative.
Advance replacement, on-site, or remote technical support are all
available 7 days a week, 24 hours a day through the Premier
Maintenance Contract program. Extended Warranty options are also
available. See your sales representative for details. Further product
information is available at www.tutsys.com.
Technical Support
Application notes and answers to the most common functionality,
installation, and configuration questions can be found on our web
site (www.tutsys.com) in the Service & Support section. If you are
unable to resolve any question or believe you have defective equip-
ment, contact Tut Systems Monday - Friday 5:00am to 8:00pm
(Pacific Time) at [phone]. If you do not have access to
800 service, please call [phone], press “0” and ask for
Technical Support.
Equipment Return and Repair
If you are unable to correct a problem or are instructed by
Technical Support to return the unit for further testing or repair,
you will be provided with directions on how to return equipment.
Do not return products to Tut Systems without first obtaining a
return authorization number.
Steps prior to shipping equipment:
• Contact the Technical Support department and request an
RMA number (return merchandise authorization).
• Write the RMA number on outside of shipping box.
• Units without proper return authorization will be returned to sender.
Return all equipment to:
Tut Systems, Inc., 2495 Estand Way, Pleasant Hill, CA 94523
[phone] • [phone] fax

XL-12000B
HIGH-SPEED NETWORK MODEM
14 TUT SYSTEMS APPENDIX A: PINOUT ASSIGNMENTS
Appendix A: Pinout Assignments
Table A.1. RJ-45 10Base-T Ethernet Connector on Rear of Modem
Pin # Mnemonic Function
1 Tx+ 10Base-T differential transmit signal (+)
2 Tx- 10Base-T differential transmit signal (-)
3 Rx+ 10Base-T differential receive signal (+)
4 NC Unused
5 NC Unused
6 Rx- 10Base-T differential receive signal (-)
7 NC Unused
8 NC Unused
Note: Assumes the switch on the rear of the unit is in the “Normal” position.
Table A.2. RJ-11 DSL Line Connector on Rear of Modem
6-pin connector 4-pin connector
Pin # Mnemonic Function Pin # Mnemonic Function
1 NC Unused 1 NC Unused
2 NC Unused 2 TIP DSL (+)
3 TIP DSL (+) 3 RING DSL (-)
4 RING DSL (-) 4 NC Unused
5 NC Unused
6 NC Unused

XL-12000B
HIGH-SPEED NETWORK MODEM
APPENDIX B: MEASURE LINE LENGTH TUT SYSTEMS 15
Appendix B: Measure Line Length
Measuring Phone Wire
1. Use a cable scanner or an ohmmeter to measure the lengths of
phone wire that will connect the modems. When using an ohm-
meter, short-circuit one end of the phone wire and measure the
resistance between the two wires at the other end .
Figure B.1 Using an Ohmmeter to Measure the Length of Phone Wire
2. Multiply the resistance by 20 to find the length of the wire in
feet. For example, 600 ohms would indicate a cable length of
about 12,000 feet: 600 x 20 = 12,000 (+/-). This formula works
for 24-gauge phone wire.
600
OHMS
Short Pair
Together
Ohmmeter
Punchdown
Block Punchdown Block

User Guide for the High-Speed Network Modem
XL-12000B
2495 Estand Way, Pleasant Hill, CA 94523
800.998.4888 or 925.682.6510
TUT SYSTEMS