Port Test; Loopback - ADTRAN DSX-1 User Manual

Chapter 3. Operation
Port T e st
16
Port Test, a submenu of the TSU 100/600 main menu
item Test, activates tests of the selected data ports.
Selecting the Passthru displays two loopback tests
available for this option module.
When Port Test is displayed, place the cursor on it and
press Enter to display the first available port. Scroll to
select 1.1 DSX1 PT and press Enter to activate.

Loopback

Loopback activates the loopback function on the
Passthru card. All ports contain a local loopback
(toward the DTE) and a port loopback (toward the NI)
as explained in the section Function Description of the
TSU 100/600 User Manual.
Line Loopback
On the Passthru card, the line loopback causes data
received at the DSX-1 interface to be looped back toward
the DTE (PBX) achieving a local loopback.
Port Loopback
The port loopback is internal and loops all data mapped
to the Passthru back toward the network interface on the
controller. The loopback (when used in conjunction
with an external bit error rate tester (BERT) driving the
network interface) exercises the entire data path from
the network interface (NI) controller, through the
Passthru option card, and back out the network inter-
face controller. See Figure 3-3.
To deactivate the loopback, select None under the 1.1
DSX1 PT submenu.
DSX-1 Passthru Option Module 61200.055L1-1C