When is network maintenance?
The IT department typically does maintenance on equipment and services on the third Friday of each month during the evening hours. Network services typically follows this same schedule although occasionally maintenance is done on other nights. There will always be a notice emailed out to the campus when network maintenance is going to be performed with a list of services and locations of campus that are going to be affected.
What happens during network maintenance?
Network maintenance could cover a wide range of activities. Typically old hardware is being replaced with new(er) hardware. This could include wireless access points or network switches and routers. There are also UPS systems (battery backups) that need to have batteries replaced every three to five years. Without UPS systems a power blink could result in a 10-15 minute network outage and the battery backup will keep the equipment running to prevent that "reboot" period. Network maintenance is also a time when closets are upgraded to newer standards of cabling.
The best way to show how network maintenance can really affect a closet is through pictures. The following pictures are all from the same network closet over the last 8 years.