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The VERSITRON VERSIMUX II Series of products are designed to multiplex multiple analog telephone lines over fiber optic cable. The wide variety of cards and chassis allow for configurations of four phone lines, eight phone lines or up to 152 phones lines. Using fiber optic SFP module technology, the VERSIMUX II offers the flexibility of using one or two strands of either multi-mode or single-mode fiber for distances of up to 80 km with no optical adjustments required. All multiplexer cards utilize standard RJ-11 phone jacks for Plug and Play, adjustment-free installation and operation. LED indicators are provided to instantly monitor the operating status of each multiplexer card and phone port. A typical installation utilizes an exchange side card at the PBX end of the application, connected via fiber optic cable, to a subscriber side card at the telephone end of the application. Products are available for either standalone or rack-mount installation.