MikroTik CRS112-8P-4S-IN operation manual
CRS112-8P series
The CRS112 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. The CRS112-8P is capable of powering other devices through PoE.
Powering
The device has two direct-input power jacks (5.5 mm outside and 2 mm inside, female, pin positive plug). One DC
input supports 48-57 V DC, the other supports 18-28 V DC. Only a 28 V PSU is included. You can use either one,
or both inputs at the same time. This will also affect the PoE output functionality (see below section).
The power consumption of this device itself under maximum load is up to 12 W.
PoE output
This device can supply PoE powering to external devices from its ethernet ports. The output voltage will be
selected automatically, depending on what kind of adapter is connected, and what kind of voltage the connected
device requires. The device can power 802.3af/at devices, but a 48 V PSU must be acquired separately.
By default the PoE mode is set to auto, it will not damage non PoE devices and will auto-detect devices with PoE
support and the needed voltage. Once a PoE device is detected, it will be powered and the PoE LEDs will turn on.
With the included 28 V PSU the max power output of each ethernet port in this mode is 1 A, total maximum for all
ports is 2.8 A. At 802.3af/at high power mode the max power output is 450 mA per port, total max 1.4 A.
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 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. See
RouterOS documentation about using the Netinstall recovery utility.
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. This is useful for RouterBOOT debugging and recovery.
For more information see www.mikrotik.com or contact support@mikrotik.com Document #35432. Modified on 09/26/17
LED indicators
• Power LED is lit when the router is powered from the DC jack.
• The user LED can be configured from RouterOS.
• The square port LEDs indicate the individual ethernet and SFP port activity.
• Triangle LEDs indicate PoE out status. Green LED indicates that the respective port uses low voltage, a
red LED indicates high voltage. Flashing single green LED: problem to start low voltage device. Flashing
single red LED: problem with high voltage device. All PoE LEDs flashing: wrong voltage PSU plugged into
one of the ports.
Grounding
The device has a grounding wingnut attached to the back of it’s case. You can attach a grounding wire to this
wingnut and connect it to a grounding bus bar that is typically available in a server room and which is then
connected to an earth ground.
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.
For more information see www.mikrotik.com or contact support@mikrotik.com Document #35432. Modified on 09/26/17
Loading...