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Chapter 5. Configuration Menu
61202156L2-1 TDU 120e User Manual 5-11
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.
Figure 5-8. Secondary Clock Source
INTERNAL
OSCILLATOR
SECONDARY
INTERFACE
OPTION CARD
NETWORK
INTERFACE
BASE Nx56/64 BASE DS-1
PBX
DTE CLOCK
T1 Transmit
T1 Receive