Cisco MDS 9100 Series - Fan Modules; Cisco MDS 9148 S Multilayer Switch Ports; Switch Leds

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Cisco MDS 9148S Multilayer Switch Hardware Installation Guide
OL-20185-01
Chapter 1 Product Overview
Fan Modules
Procedures for replacing and installing the power supplies are available in the Removing and Installing
AC Power Supplies section.
Fan Modules
The Cisco MDS 9148S switch supports two hot-swappable fan modules that allow the switches to
continue to run if a fan module is removed, provided that the preset temperature thresholds have not been
exceeded. You can swap out a fan module without having to bring the system down. Each fan module on
the Cisco MDS 9148S switch has two fans.
Caution The Cisco MDS 9148S switch has internal temperature sensors that can shut down the system if the
temperature at different points within the chassis exceed certain safety thresholds. To be effective, the
temperature sensors require the presence of airflow; therefore, in the event a fan module is removed from
the chassis, the Cisco MDS 9148S switch will shut down after five minutes to prevent potentially
undetectable overheating. However, the switches will shut down sooner if the higher-level temperature
threshold is exceeded. For normal operation, the Cisco MDS 9148S Switch requires four fans. Fan
module status is also indicated on a front panel LED.
Procedures for replacing and installing the fan modules are available in the Removing and Installing Fan
Modules section.
Cisco MDS 9148S Multilayer Switch Ports
The Cisco MDS 9148S switch provides host, target, and Inter-Switch Link (ISL) connectivity. It
provides up to 48 autosensing and autonegotiating Fibre Channel ports capable of speeds of 2-, 4-, 8-,
and 16-Gbps. The first 12 ports are licensed by default. On-Demand Port Activation Licensing allows
expansion up to 48 ports, with additional ports available as an 12-port group.
Switch LEDs
The front panel of the Cisco MDS 9148S switch includes the LEDs shown in Figure 1-3. You can use
the LEDs on this panel to quickly identify system status.
Note Cisco MDS 9148S switch LEDs do not indicate the port speed.