ADTRAN TSU 120e - Manual (Page 64)

Chapter 5. Configuration Menu
5-6 TSU 120 User Manual 61202129L1-1
Network Timed
The network is the source of timing. The received data clocking
is looped back to the network where it is used to determine the
transmission timing. This option is also referred to as loop
timed as the transmission clock is derived from the received
clock. See Figure 5-2.
.
Figure 5-2. Network Timed Clock Source