In typical analog telephone applications, these devices are used in pairs with the F270xAD or F270xA unit installed at the exchange side and the F271xAD or F271xA unit installed at the subscriber side. The units are linked together using multimode fiber or singlemode fiber as appropriate. Other configurations are possible, such as ring-down or intercom applications.
These products have 3 distinct features:
The phone portion of these products converts a standard loop start two-wire analog voice circuit to light signals for transmission over fiber optic cable.
The data portion of these products provides RS-485 or RS-422 data links over fiber. Maximum data rate is 64 Kbps. (F27xxAD Only)
The analog circuit supports data up to 14.4kbps via dial-up or fax.