Chapter 5. Configuration Menu

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.

T1 Transmit

INTERNAL

OSCILLATOR

NETWORK

INTERFACE

SECONDARY INTERFACE

OPTION CARD

T1 Receive

BASE Nx56/64

BASE DS-1

DTE CLOCK

PBX

Figure 5-8. Secondary Clock Source

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TDU 120e User Manual

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