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• Reset the switch to factory default settings: All settings are erased and the switch
restarts with factory default settings.
To restart or reset the switch using the Reset button:
1. Insert a device such as a straightened paper clip into the opening.
2. Do one of the following:
• Restart the switch: Press the Reset button for 2 seconds. (Do not press the
button for 5 seconds!)
• Reset the switch to factory default settings: Press the Reset button for at least
5 seconds.
During the restart or reset process, the Power LED lights yellow.
USB 2.0 port
The switch provides one USB 2.0 port that lets you upgrade firmware from a disk, back
up the configuration to a storage device, and allow for the collection of a memory dump
for debugging purposes.
A device that you attach to the USB port must comply with the following requirements:
• The USB device must support USB 2.0.
• The USB device must support the FAT32 or VFAT file type. The NTFS file type is not
supported.
Because of hardware limitations, the write speed to and read speed from a USB device
is about 1 Mbps.
Out-of-band 1G Ethernet port
The back panel of the switch provides one out-of-band (OOB) 1000BASE-T RJ-45
Ethernet port that lets you access the switch over its main local browser UI or over a
Telnet or SSH session.
RJ-45 RS-232 console port
The back panel of the switch provides one RJ-45 RS-232 console port for console access
only. This serial port is configured for 115200 baud, eight data bits, one stop bit, and
no parity.
The switch package includes one console cable with one DB9 connector and one RJ-45
connector. You can use this cable to connect the RJ-45 RS-232 console port on the
Hardware Overview
AV Line of Fully Managed Switches M4250 Series
37
Hardware Installation Guide
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Table of Contents
Troubleshooting
