ADTRAN TDU 120e user manual Normal CSU Timing

Chapter 5. Configuration Menu

Normal (CSU) Timing

The typical timing option arrangement is shown in Figure 5-9. The PBX is looped timed sending data to the TDU 120e which is actually synchronous to the received data. The Network Interface (NI) is the actual source of all timings. This timing option is the same as that typically used for CSUs. It works equally well when the PBX is the source of timing. In that configuration the network would not be provid- ing timing.

	INTERNAL
	OSCILLATOR
T1 Transmit	NETWORK	SECONDARY
	INTERFACE
		INTERFACE
		OPTION CARD
T1 Receive	BASE Nx56/64
		BASE DS-1

DTE CLOCK

PBX 1

PBX 2

Figure 5-9. Normal (CSU)

The network interface and secondary interface clocking options are set by using the Network (NI) Configuration menu options.

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