ADTRAN TSU 120e user manual Normal CSU Timing

Chapter 5. Configuration Menu

Normal (CSU) Timing

In the Normal (CSU) Timing mode, the Receive Clock is derived from the Network Interface while the Transmit Clock is derived from the PBX or other alternative timing source, con- nected to the Secondary Interface (e.g., Drop and Insert or DSX-1). See Figure 5-7.

This timing option is the same as that typically used for CSUs. This is the preferred mode for use with a PBX application.

Network

Interface

(NI)

Secondary

Interface

(SI)

( O P T I O N )

Figure 5-7. Normal (CSU)

The network interface and secondary interface clocking options are set by using the Network (NI) Configuration menu options. Either a DSX-1 Option Module or a Drop and Insert Option Module must be installed in the TSU 120 for this mode to func- tion.

U-BR1TE

The U-BR1TE timing selection works like Normal (CSU) except that timing is derived from the U interface on port 1.1.

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