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DTIB4 can be installed on the SLIB/DTIB connector, and provides 4 Digital Keyset ports that are used for 2-wire connections for Digital Keysets. It has a module connector, MJ1, which is used to connect Digital Keyset lines to the DTIB4 and a din connector, CN2, to connect expansion modules like VOIM, SLIM, and DTIM.

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