The 3RU high modular design of the Protection Switch provides a smooth one-unit look when stacked on the DNX-11. The Protection Switch has two (2) redundant and nine (9) primary slots, one common logic controller slot and two (2) 48 VDC power supply slots. All of the redundant and primary cards are hot pluggable (including power supply). The Controller interfaces between the N+1 Protection Switch and the DNX-11 System Manager Controller (SMC) II module. It is required to use SMC IIs with the N+1 Protection Switch and recommended that redundant SMC IIs be used.

The integral auto-sensing fan assembly provides the additional system cooling. This three-speed cooling system automatically senses the temperature and will change fan speeds accordingly. The automatic speed change (auto sensing temperature) can also be controlled via the menu screen to the Low, Medium, or High setting which ranges from 85º to 122ºF. There is also an auto alarm notification when the fan speeds slow down.

Capabilities and Features: The N+1 Protection Switch provides the user with automatic N by Narrowband and Broadband card protection. This automatic detection provides immediate backup for a problem module by switching the connections to a standby module, eliminating long down time and the need for immediate feet on the street. The standby module assumes all of the cross connections and maps of the deficient module at the time of switchover. The user is aware of the switchover by may different methods: front LED indicators on the modules, the alarm LED's on the System Manager Card (SMC) II, the auto alarm indicators, or the node summary screen which is available via telnet, or terminal connection.