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- Supplies timing, including Stratum 4 timing to the Port Network (PN)
- Produces the following tones: call progress, touch tones, answer-back, and trunk transmission test
- Equipped with 2 MHZ, 16 kHz, and 8 kHz clocks
- Can transmit the system clock and tones on either Time Division Multiplexing (TDM) bus A, TDM bus B, or both
- Replaced by TN2182B Tone Clock
- Not necessary to replace TN768 with TN2182B in an upgrade
- TN768 is an acceptable tone clock for R7 or later
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