User`s manual

RouterBOARD Crossroads User's Manual
Hardware Guide
Memory and Storage Devices
Onboard Memory
The boards are equipped with one 32MB SDRAM memory chip.
Onboard NAND Storage Device
The boards are equipped with one 128MB NAND nonvolatile memory chip.
Input/Output Ports
LAN Port with PoE
This Fast Ethernet port is compatible with IEEE802.3af Power over Ethernet standard and PoE active
(802.3af The board accepts non-standard voltage input in wide range: from 11 to 60 V DC.
The RouterBOARD 51 power injector may be used to power the board with up to 100m (330 ft) long
Ethernet cable. It is suggested to use 48V DC power for power over long cables because of better efficiency
(less power is lost in the cable itself and power supply is more efficient on higher voltage).
When using a PoE switch to power the Crossroads – there can be a small timeout before power is delivered
and the board starts, wait a few seconds.
See Connector Index for pinout of the standard cable required for PoE. All cables made to EIA/TIA 568A/B
cable specifications will work correctly with PoE. Note that this port supports automatic cross/straight cable
correction (Auto MDI/X), so you can use either straight or cross-over cable for connecting to other network
devices.
WLAN Interface
This onboard IEEE802.11b/g wireless interface provides stable radio connection on the standard 2.4GHz
frequency range with 400mW maximum output power (FCC). It has two antenna connectors, of which only
the main one (J5) is used by default, but the auxiliary connector (J4) can be configured in the software as
well.
DB9 Serial Port
The RS232C standard male DB9 asynchronous serial port may be used for initial configuration, or for
attaching a modem or any other RS232 serial device. TxD (pin 3) of this port has -5V DC power when idle.
DCD and DSR signals are not connected. This implementation may not be considered to support full
hardware flow-control so software flow-control (XON/XOFF) should be used.
LEDs
Power LED
A Blue LED is lit when the board is powered.
Wireless LEDs
A pairs of LEDs are connected to the onboard wireless interface according to standards.
User's Guide
Assembling the Hardware
First use of the board:
● In most cases you do not need to configure jumpers. JP2 PoE control is disabled by default, you may
want to enable it to comply with IEEE802.3af requirements. See Jumper Index for details.
● Install the board in a case.
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