Installation manual

Authorized Service Personnel ONLY:

The GPIO output pins will not function (logic high) when the Controller Card is “out-of-

service”. The GPIO output pin states are not dependent on which or any Switch Cards

being installed.

Daisy-Chaining Chassis’s via GPIO

NOTE: Not used when connected to Emix or MaxAir.

Multiple COS Chassis’s can be daisy-chained together for larger scale integration. A

cable needs to be constructed allowing the GPIO output pins of one unit to be connected

to the GPIO input pins of the next. The global back plane switches would need to be

properly configured to allow for the daisy chaining.

If the chain is not completed back to the

first

chassis and a ring is not formed, then global

back plane switch assertions will only be propagated down the chain.

CAUTION: If the chain is completed back to the first chassis and a ring is formed, a

particular caveat should be noted. Once a global back plane switch is triggered and the

signal propagated, the only way to clear it is through moving all the front panel switches

to the “A” position manually. Serial and Ethernet driven clear signals would have to all

occur at exactly the same time or would be overridden by their upstream neighbor. This

is obviously not possible.

Card Hot Swapping

Switch and Controller Cards can be hot swapped. That is they can be removed and

replacements re-inserted without powering down the Chassis. This operation should

always be done with great care to prevent damage to the cards caused by shorting with

jewelry or other conductive substances, and to prevent damage to the Card connectors

caused by misaligned insertions.

To hot swap a card, release both of the card’s ejector lever locks, only one of them will

be detected by the card’s software and the card will be powered off. The other is only

a mechanical release. Since it is not always clear which ejector switch is which, both

should be released.

Immediately after ejector release, the green “OK” LED will go off and the blue “OOS”

LED will light. If the “Fault” LED was lit, it will also turn off.

When the blue “OOS” LED is lit, use the ejector switches to lever the card out of the

slot smoothly and firmly. At a certain point the blue “OOS” LED will turn off and the

resistance will decrease.