The NTTFAX L-70 was released with an internal CCITT-compliant 14.4-kbps modem, enabling high-speed (6 second) transmission. This model supports ciphered (encrypted) communication for ensuring complete security in facsimile communication. This model provides more efficient facsimile communication using diversified transmission functions such as 64-gradient halftone, super-fine modes for offering clear images, and many types of memory functions.

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