ADTRAN ESU 120e user manual Normal CSU Timing

Chapter 5. Configuration Menu

Normal (CSU) Timing

The typical timing option arrangement is shown in Figure 5-6. The PBX is looped timed sending data to the ESU 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. This is the preferred mode for use with a PBX application.

This timing mode works equally well when the PBX is the source of timing. In that configuration the network would not be providing timing.

E1 XMIT

E1 Receive

		OSC	Secondary
Network
				Interface	(IO PB)
Interface				(SI)
(NI)			( O P T I O N )
		Nx56/64	Drop Port
	DTE CLOCK

PBX

DTEPBX

Figure 5-6. Normal (CSU)

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

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