Hughes DIRECWAY DW4020 User Manual

If corrective measures do not solve a problem, contact technical 
support.

TxCode 8 means the transmit modem is working properly. It is 
the code you will see most of the time.

Remember that IRU refers to the receive modem, and that 

ITU refers to the transmit modem.

Numeric 
TxCode

Message Displayed

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The transmitter is not 
connected to the receiver

This status will occur only if the Indoor Transmit Unit (ITU) is not connected to 
the Indoor Receive Unit (IRU). It can result for the following reasons:

• The 25-pin parallel cable is not properly connected to the Indoor Receive Unit 

or Indoor Transmit Unit: Check the cable and make sure the ends are securely 
fastened.

• Indoor Transmit Unit failure. The Indoor Transmit Unit has failed and may need 

to be replaced.

1

The transmitter has been 
disabled by the Network 
Operations Center

This condition occurs when the transmitter is not enabled. A transmitter may be 
disabled for short periods of time by the NOC for service or troubleshooting. It 
may also be disabled if the user discontinues the satellite service. If this 
condition persists, it can only be corrected by requesting that the unit be 
enabled.

2

The transmitter has been 
placed in test mode by the 
Network Operations Center 

This status requires no user action and this test usually completes in 15 minutes 
or less. This condition occurs when the NOC places the transmitter into special 
transmission modes to measure the performance of the transmitter. When in this 
mode, the unit is unable to transmit normal user data to the NOC.

3

The transmitter is locking to 
the receive carrier

This condition occurs during initial startup or when the receiver is locking to the 
receive signal. It is normal for this condition to persist for up to 10 seconds. If this 
condition
persists for more than 10 seconds, try disconnecting and reconnecting the 
receiver coaxial cable and wait 10 seconds. If the situation still persists, then the 
Indoor Transmit Unit may need to be replaced.

4

The transmitter is not 
responding to commands sent 
from the receiver

This condition indicates that something is not operating properly in the 
Receive/Transmit Unit configuration. Perform the following actions to attempt to 
recover from this condition:

• Verify that the Indoor Receive and Transmit Units are securely connected with 

a 25-pin parallel cable.

• Reset the IRU by unplugging the IRU power cord from the wall socket and then 

plugging the power cord back into the wall socket. This will reset the Indoor 
Receive and Transmit Units.

This condition could also be caused if the power supply is faulty. If this condition 
cannot be resolved by following the steps listed above, then you may need to 
replace the power supply, the Receive/Transmit unit cable and/or the Transmit 
Unit.