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Chapter 5. Configuration Menu
5-10 TDU 120e User Manual 61202156L2-1
Internal Timing
The TDU 120e is the source of timing. The TDU 120e
is configured to use its own internal oscillator as the
source of timing. Applications include private line
driver circuits where one end is set to network and
the other to internal. See Figure 5-7.
Figure 5-7. Internal Clock Source
INTERNAL
OSCILLATOR
SECONDARY
INTERFACE
OPTION CARD
NETWORK
INTERFACE
BASE Nx56/64 BASE DS-1
PBX
DTE CLOCK
T1 Transmit
T1 Receive