Troubleshooting; Messages From The Dsu/Csu; Table 11-1. Messages From The Dsu/Csu - ADTRAN DSU III AR User Manual

TROUBLESHOOTING

This section is intended to provide a quick and easy means of
diagnosing suspected problems associated with local or remotely
attached ADTRAN DSU/CSUs. Two separate troubleshooting
sections are provided; one focuses on new installs, the other on
existing circuits.

Messages from the DSU/CSU

The DSU III AR displays messages on the LCD display and LEDs
concerning the status of the unit and the local loop. If the Alarm
LED is O
displayed on the LCD.
The S
messages. Press the
can be selected.
Message
LOOP IS Good local loop sig-
nal being received
NORMAL
from the telco.
OPEN LOOP Unit not receiving a
signal from the telco.
NO RX Unit detects sealing
current but no data
SIGNAL
signal from telco.
OOS/OOF Unit detects an Out of
Service or Out of
FROM NET
Frame condition from
the telco.
61202011L1-1
, at least one of the messages shown in Table 11-1 will be
N
menu must be selected in order for the unit to display status
TATUS
key to return to the main menu, where S
Quick

Table 11-1. Messages from the DSU/CSU

Meaning Probable Cause
Indicates good local
loop.
Bad telco cable from
the DSU to telco jack
or bad circuit to telco.
Bad conductor in telco
cable from DSU to tel-
co jack or bad circuit to
telco.
Telco is having prob-
lems with DDS circuit
or remote unit is turned
off or disconnected.
DSU III AR User Manual
Chapter 11. Testing and Troubleshooting
Action
No action required; unit
properly connected to telco
circuit.
Replace telco cable from
DSU to wall jack. If a prob-
lem persists, contact telco
provider.
Replace telco cable from
DSU to wall jack. If a prob-
lem persists, contact telco
provider.
Check remote unit. Contact
telco service provider. If a
problem persists, contact tel-
co provider.
TATUS
11-5