ADTRAN TSU 600 - Manual (Page 31)

Chapter 1. Introduction
61200.076L2-1 TSU 600 User Manual 19
The TSU 600 also activates a port loopback when the DTE
loopback is asserted.
TSU 600
T1
Nx56/64 Interface
Nx56/64 to
Network Control
Circuit
Network Interface
(NI)
to DTE
Port
Loopback
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
T1
Nx56/64 Interface
Nx56/64 to
Network Control
Circuit
Network Interface
(NI)
to DTE
Port
Loopback
Figure 1-11
Port Interface Loopback