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Chapter 5. Configuration Menu
5-8 TDU 120e User Manual 61202156L2-1
Base DS-1
The PBX is the source of timing. The TDU 120e uses
the clock derived by the Base DS-1 interface for
transmission timing. See Figure 5-5.
Figure 5-5. Base DS-1 Timed Clock Source
INTERNAL
OSCILLATOR
SECONDARY
INTERFACE
OPTION CARD
NETWORK
INTERFACE
BASE Nx56/64 BASE DS-1
PBX
DTE CLOCK
T1 Transmit
T1 Receive