ADTRAN TSU 120e user manual Secondary Timing

Chapter 5. Configuration Menu

Secondary Timing

The secondary interface is the source of timing. The TSU 120 uses the clock derived by the secondary interface for transmis- sion timing and the receive signal timing. See Figure 5-6.

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.

T1 XMIT

( D S 1 )

T1 Receive

OSC

Network			Secondary
				Interface
Interface
				(SI)
(NI)
			( O P T I O N )
		Nx56/64	DSX
	DTE CLOCK

(IO PB)

PBX

DTEPBX

Figure 5-6. Secondary Timing

5-10 TSU 120 User Manual 61202129L1-1