RouterBOARD Crossroads
User's Manual
Rev. B (2-Aug-2007)
Copyright
Copyright © 2003-2007 MikroTikls SIA. This manual contains information protected by copyright law. No
part of it may be reproduced or transmitted in any form without prior written permission from the copyright
holder.
Trademarks
RouterBOARD, RouterOS, RouterBOOT and MikroTik are trademarks of MikroTikls SIA. All trademarks and
registered trademarks appearing in this manual are the property of their respective holders.
Limited Warranty
Hardware. MikroTikls SIA warrants all RouterBOARD Crossroads series equipment for the term of one year
from the shipping date to be free of defects in materials and workmanship under normal use and service. All
parts will be repaired or replaced with similar or functionally equivalent parts by MikroTikls SIA during the
warranty term, except in case the returned parts have mechanical, electrical or other accidental or intended
damages caused by improper use or due to wind, rain, fire or other acts of nature.
Parts (or systems) must be shipped pre-paid to our facility in Riga, Latvia. All items must have a Return
Material Authorization (RMA) which you can get by contacting us via email, telephone or fax. The RMA form
must be printed, signed, and enclosed with the shipment, also the RMA number must be written on the
package itself. Parts sent without following the proper procedure will be treated as those not to be repaired
or replaced due to the above mentioned conditions. Items proved to be free of defects in our lab will be
returned to the customer at the customer's expense. Those that do meet the warranty repair requirements
will be repaired or replaced, and returned to the customer's location at our expense, extending the warranty
term for the time the items are being shipped to and from our facility and replaced or repaired.
Manual. This manual is provided “as is” without a warranty of any kind, expressed or implied, including, but
not limited to, the implied warranty of merchantability and fitness for a particular purpose. The
manufacturer has made every effort to ensure the accuracy of the contents of this manual, however, it is
possible that it may contain technical inaccuracies, typographical or other errors. No liability is assumed for
any inaccuracy found in this publication, nor for direct or indirect, incidental, consequential or other
damages that may result from such an inaccuracy, including, but not limited to, loss of data or profits.
Please report any inaccuracies found to docs@mikrotik.com.
RouterBOARD Crossroads User's Manual
Table of Contents
Copyright....................................................................................................................................... 1
Trademarks.................................................................................................................................... 1
Limited Warranty............................................................................................................................ 1
System Board View......................................................................................................................... 3
System Board Layout....................................................................................................................... 3
Block Diagram................................................................................................................................ 3
Specifications................................................................................................................................. 4
Hardware Guide.............................................................................................................................. 5
Memory and Storage Devices................................................................................................... 5
Onboard Memory........................................................................................................... 5
Onboard NAND Storage Device........................................................................................ 5
Input/Output Ports.................................................................................................................. 5
LAN Port with PoE.......................................................................................................... 5
WLAN Interface............................................................................................................. 5
DB9 Serial Port.............................................................................................................. 5
LEDs..................................................................................................................................... 5
Power LED.................................................................................................................... 5
Wireless LEDs................................................................................................................ 5
User's Guide................................................................................................................................... 5
Assembling the Hardware........................................................................................................ 5
Powering............................................................................................................................... 6
Booting options...................................................................................................................... 6
Onboard NAND Storage Device........................................................................................ 6
Booting from network..................................................................................................... 6
Operating System Support....................................................................................................... 6
System Architecture....................................................................................................... 6
MikroTik RouterOS......................................................................................................... 7
RouterBOOT................................................................................................................................... 7
Boot Loader Configuration........................................................................................................ 7
Configurable Options...................................................................................................... 7
Boot Loader Upgrading............................................................................................................ 8
Appendix....................................................................................................................................... 9
Connector Index..................................................................................................................... 9
Jumper Index....................................................................................................................... 10
Button Index........................................................................................................................ 10
Ethernet Cables.................................................................................................................... 10
Serial Null-modem (Console) Cable with Loopback..................................................................... 10
FCC Notice (FCC ID: TV7-CRD)............................................................................................... 11
2
RouterBOARD Crossroads User's Manual
System Board View
System Board Layout
Block Diagram
3
CPU
Onboard RAM
Power
Supply
12/48V PoE
11..60V DC power jack
Onboard Flash (NAND)
100BaseTX
(with PoE in)
Serial port
WLAN LEDs
GPIO
WLAN Antenna
Connectors
RouterBOARD Crossroads User's Manual
Specifications
RouterBOARD Crossroads
CPU MIPS32 4KEc based 184MHz embedded processor
Memory 32MB SDRAM onboard memory chip
Boot loader RouterBOOT, 1Mbit Flash chip
Data storage 64MB onboard NAND memory chip
Ethernet One 10/100 Mbit/s Fast Ethernet port supporting Auto-MDI/X
Wireless standards
IEEE802.11b (1..11Mbit/s, auto-fallback);
IEEE802.11g (6..54Mbit/s, auto-fallback, IEEE802.11b compatibility option)
Wireless frequency
2412..2472MHz (5MHz step) and 2484MHz channels;
22MHz bandwidth B or B/G mode;
20MHz (standard), 40MHz (turbo), 5 and 10MHz (reduced) bandwidth in G mode
Output power
Receive sensitivity
Serial port One DB9 RS232C asynchronous serial port
LEDs Power, a LED pair for wireless interface
Speaker Mini PC-Speaker
Power options
IEEE802.3af Power over Ethernet: 12V..48V DC (including power over datalines)
Power jack: 11..60V DC
Power output 3V and 5V DC fan power output headers, maximum output current - 500mA total
Dimensions 105mm x 95mm (4.13 in x 3.74 in)
Weight
Temperature Operational: -20°C to +70°C (-4°F to 158°F)
Humidity Operational: up to 70% relative humidity (non-condensing)
Power consumption typical – 6W, max - 12W
4
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