Quick Guide

CRS112-8G-4S-IN
This device is a network switch with eight gigabit ethernet ports and four SFP ports. It is already configured, with all
ports switched together. We recommend you to set up a password to secure your device. This unit is compatible
with 1.25G SFP modules.
Powering
The board accepts powering from the direct-input power jack (5.5 mm outside and 2 mm inside, female, pin positive
plug) accepts 10-57 V DC. The ethernet port 1 also accepts passive PoE power input. The power consumption of
this device under maximum load is up to 11 W. It is possible to connect both power inputs at the same time and
they will work in failover mode (input with higher voltage will work as main source).
Configuration
The device is set up as a switch, with 192.168.88.1 as the management IP of the bridge interface. RouterOS
includes many configuration options in addition to what is described in this document. We suggest to start here to
get yourself accustomed to the possibilities: http://mt.lv/help.
In case IP connection is not available, the Winbox tool (http://mt.lv/winbox) can be used to connect to the MAC
address of the device.
The device is equipped with an RJ45 serial port, set by default to 115200 bit/s, 8 data bits, 1 stop bit, no parity.
Standard RJ45 to COM cable can be used, pinout can found in the documentation (see link above).
For recovery purposes, it is possible to boot the device from network, see the next section.
Buttons and Jumpers
The reset button has these functions:
 Hold this button during boot time until the user LED light starts flashing, release the button to reset
RouterOS configuration.
 Keep holding the button for 5 more seconds or until until the user LED turns off, then release it to make the
RouterBOARD look for Netinstall servers. The first ethernet port is used for the Netinstall process.
Regardless of the above option used, the system will load the backup RouterBOOT loader if the button is pressed
before power is applied to the device. Release the button before LED begins to flash, to only load backup
RouterBOOT without reset. This is useful for RouterBOOT debugging and recovery.
LED indicators
• Power LED is lit when the router is powered from the DC jack or PoE.
• The user LED can be configured from RouterOS.
• The port LEDs indicate the individual ethernet and SFP port activity.
Operating System Support
The device supports RouterOS software with the version number at or above what is indicated in the RouterOS
menu /system resource. Other operating systems have not been tested.
See mikrotik.com for more information. Contact [e-mail] for basic assistance. Document #36394, Modified on: 11/16/17