Figure 5-8. Secondary Clock Source; Secondary Timing - ADTRAN TDU 120e User Manual

T1 Transmit NETWORK
INTERFACE
T1 Receive
61202156L2-1

Secondary Timing

The secondary interface is the source of timing. The
TDU 120e uses the clock derived by the secondary
interface for transmission timing. See Figure 5-8.
INTERNAL
OSCILLATOR
BASE Nx56/64
DTE CLOCK
TDU 120e User Manual
Chapter 5. Configuration Menu
SECONDARY
INTERFACE
OPTION CARD
BASE DS-1
PBX

Figure 5-8. Secondary Clock Source

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