
32 Installing the DDI MUX
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Troubleshooting
These troubleshooting procedures help you to solve problems with network connections and
cables. Read these troubleshooting tips before replacing any components.
Before you begin troubleshooting, gather all the information that is relevant to your network
configuration:
• the DDI MUX Programming Record
• records from persons who use the network
• information about other hardware such as routers, within the public or private network
LED Indicator and Diagnostics
The DDI MUX has 15 LEDs to check or monitor its status.
Figure 8 DDI MUX LEDs
RxDTxD RTS CTS DCD DSR TM10101
Test Mode (TM)
Data Set Ready (DSR)
Data Carrier Detect (DCD)
Clear to Send (CTS)
Request to Send (RTS)
Receive Data (RxD)
Transmit Data (TxD)
Power
Status
In Service
Loopback Test
Receive LEDs
Transmit LEDs
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