ADTRAN TSU 600 user manual DTE Interface Loopback, Port Interface Loopback

Chapter 1. Introduction

The TSU 600 also activates a port loopback when the DTE loopback is asserted.

TSU 600

		Nx56/64	Interface
T1	Network Interface	Nx56/64 to
		Network Control
	(NI)	Circuit
			Port
			Loopback

to DTE

Figure 1-10

DTE Interface Loopback

Port loopback loops that portion of the network bandwidth programmed for a port back toward the network. This loopback occurs within the port electronics, but before the DTE interface. See Figure 1-

11.The port loopback also automatically activates the DTE loopback looping the DTE data back on itself. The port loopback is activated by command from the front panel or from the T-Watch program. This causes a V.54 loopback code to be sent to the far end unit.

TSU 600

		Nx56/64	Interface
T1	Network Interface	Nx56/64 to
		Network Control
	(NI)	Circuit
			Port
			Loopback

to DTE

Figure 1-11

Port Interface Loopback

61200.076L2-1 TSU 600 User Manual 19