Nortel Meridian 1 option 11C Planning And Installation Manual page 210

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When a multi-cabinet system is upgraded from copper to fiber optic cable
inter-cabinet connections, the NTDK26 Backwards Compatible
Daughterboard must be replaced with fiber expansion daughterboards. The J7
jumper plug must be installed at the same time if the ethernet capability is
required. See Figure 77 on page 210.
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