User guide

6-2 Solo E1 DSU User Guide—June 1998
6
The Solo E1 DSU Does Not Power Up
If the unit is AC powered, make sure the Solo E1 DSU is plugged into a
live AC outlet. If the unit is DC powered, make sure the respective DC
leads are not crossed.
Check all fuses for opens and replace as needed.
The Solo E1 DSU Does Not Dial Out When An Alarm Occurs
Make sure the connection between the COMM Port and the modem is a
crossover (null) modem connection.
A DCE port is represented the same way as the modem port.
Table 6-1 Problem List
Problems
“The Solo E1 DSU Does Not Power Up” on page 6-2
“The Solo E1 DSU Does Not Dial Out When An Alarm Occurs” on page 6-2
“Current Tests Terminate Without My Intervention” on page 6-3
“The Solo E1 DSU can not Enter Network Loopback from the Carrier” on page
6-3
“The Unit Suffers Loss Of Signal or Loss Of Frame on the Network Port” on
page 6-3
“Unframed All 1s Are Received On The Network Port” on page 6-3
“The Solo E1 DSU can not enter into Payload Loopback from the Network” on
page 6-3
“The NET LED does not Illuminate” on page 6-4
“The NET LED is Constantly Red” on page 6-4
“The NET LED Remains a Constant Yellow” on page 6-4
“The NET LED Flickers Intermittently between Red, Yellow and Green” on page
6-5
“The Data Port TD/RD LEDs do not Illuminate” on page 6-5
“The DATA Port RTS/CTS LEDs do not Illuminate” on page 6-6
“The DTE Device Shows Intermittent Errors” on page 6-6
“No LEDs Illuminate” on page 6-6
“After Powerup, the Clock Does Not Show the Correct Time or Date” on page
6-6