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(Optional) Installing a CKM Daughter Card
Context
This section describes how to install a clock daughter card CKM on a motherboard.
- If the switch is equipped with two MPUs, you must install clock daughter cards on both the active and standby MPUs.
Take ESD protective measures when installing a clock daughter card.
Procedure
- Lay the ESD fabric on a desk or another flat surface. Use the ESD bag of a card as a substitute if no ESD fabric is available.
- Wear an ESD wrist strap or a pair of ESD gloves. When wearing an ESD wrist strap, insert the other end in the ESD jack of a device and ensure that the device is reliably grounded.
- Take out the motherboard (SRU/MCU) from the ESD bag and place the motherboard on the ESD fabric.
- Take out the clock daughter card from the ESD bag. Use a Phillips screwdriver to loosen the three screws on the clock daughter card, and then disassemble them into type-1 screws, long studs, short studs, and type-2 screws.
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- Install three studs on the motherboard.
If the motherboard is an Main Control Unit (MCU), install the three short studs into holes M9, M10, and M11. Fasten the studs.
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If the motherboard is an Switch Routing Unit (SRU), install the three long studs into holes M8, M10, and M11. Secure the long studs with type-1 screws from back of the SRU. Fasten the screws with the Phillips screwdriver.
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- Gently insert the connectors of the clock daughter card into the slots on the motherboard, and then use type-2 screws to secure the clock daughter card on the motherboard. Fasten the screws with the Phillips screwdriver.
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