Chapter 5. Configuration Menu

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.

INTERNAL

OSCILLATOR

T1 Transmit

NETWORK

INTERFACE

T1 Receive

SECONDARY INTERFACE

OPTION CARD

BASE Nx56/64

BASE DS-1

DTE CLOCK

PBX

Figure 5-7. Internal Clock Source

5-10

TDU 120e User Manual

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ADTRAN TDU 120e user manual Internal Timing, Internal Clock Source