§ 68.506 - Configurations used to connect multi-line communications systems such as Private Branch Exchange (PBX) and key telephone systems.

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Any of the jack configurations specified in § 68.502, used singly, in multiple combinations, or combined in common mechanical arrays, may be used as the interface between multi-line equipment such as PBX and key telephone systems, and the telephone network. The telephone company and installation supervisor may mutually agree to use electrical connections alternative to those specified in § 68.502.

                    
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