RouterBOARD 1100/AH Series User's Manual
5
Input/Output Ports
Ethernet ports
There are thirteen ethernet ports. There are two switch groups, five ports each. The Ether13 port supports
Power over Ethernet.
The RB1100 device also has two Ethernet bypass ports (Ether11 and Ether12). The bypass mode can be
activated by turning the bypass switch next to them to the position 1. Position 0 turns off the bypass mode and
ports work as usual.
All cables made to EIA/TIA 568A/B cable specifications will work correctly (see Connector Index for pinout).
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.
Ethernet bypass mode
Bypass mode is used to cross-connect the two RJ45 connectors (Ether11 and Ether12) electrically thus creating
an extended Layer 1 network. Traffic present on either network (Internal or External) is seen on the other
network immediately.
If the router would stop working for some reason, the ports would be connected together as if there would be
no router in between. You could configure your network to allow this, and in case of hardware failure, the
communications would still work, as if the (broken) router wouldn't exist there.
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. Some signals
are not connected, so this implementation may not be considered to support full hardware flow-control, so
software flow-control (XON/XOFF) or none at all should be used.
Fan Connectors
You can connect up to four fans to the RouterBOARD, but only two of them will work at a time. They will
receive 12V DC power. The board supports fan speed feedback signaling. RouterOS can be configured to
change the active fan, if the current active one is not rotating (note that if a fan does not have rotation sensor,
it will be considered failed).
LEDs
Power LED
Power LED is on when the board is powered.
User LED
User LED may be programmed at user's option. It is lit by default when the board starts up, then it is turned off
when the bootloader runs kernel.
User's Guide
Assembling the Hardware
In most cases you do not need to use any additional boot devices, as you can boot the RouterBOARD from the
onboard NAND memory. You can also install one microSD card which you can use as an alternative boot device
(not for RouterOS) or additional storage media;
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