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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.
- 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.
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.
- 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.
