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The type 3 motherboard permits five of these cards to be accommodated in the
rackframe, alongside other conventional modules. Optical modules are supplied with
blanking panels with cut-outs to be fitted to the rear of the frame. The fibre and
coaxial connectors protrude through slots in the motherboard and must be secured
to the rear panel using a lock washer and retaining nut from the rear of the frame.
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WARNING: The lock washer and retaining nut form an essential
chassis connection for EMC compliance and must not be omitted
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