
436 Chapter 10 Testing, Troubleshooting, and Diagnostics
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5 Click the Loopback drop list and then click Manual DTE or Automatic DTE.
If you choose Manual DTE, the DDI Mux enters loopback mode with the DTE. The Business
Communications Manager takes any data it receives from the DTE and loops it back to the
DTE.
If you choose Automatic DTE, the DDI Mux enters the DTE loopback state when requested
by the DTE. Use Automatic DTE only if this feature is supported by the DTE.
6 Exit the Unified Manager session. The TM LED lights to indicate the Loopback test has
started.
7 View the TxD and RxD LEDs to make sure data is transmitted and received by the DTE. Refer
to “LED Indicator and Diagnostics” on page 436 for information about the LEDs.
8 When you are finished the loopback test, start a Unified Manager session.
9 Click the Resources key and then the Media Bay Modules key.
10 Click the key of the Bus number assigned to the Data Module.
11 Click the Data Module key and then click the Loopback status heading.
12 Click the Loopback drop list and then click Off.
LED Indicator and Diagnostics
The DDI Mux has 15 LEDs that indicate current status or operating conditions:
Table 33 DDI Mux LED description
LED Description
TxD
(Transmit data)
The LED flashes at a rate equal to the number of zeros in the data received from the
DTE and transmitted over the network. The speed of the flashes is an indication of
the speed of the data sent over the network.
RxD
(Receive data)
The LED flashes at a rate equal to the number of zeros in the data received from the
network and transmitted to the DTE. The speed of the flashes is an indication of the
speed of the data sent over the network.
RTS
(Request to Send)
The LED lights when the DTE requests permission from the DDI Mux to send data.
CTS
(Clear to Send)
The LED lights when the DDI Mux is signaling the DTE that it has permission to
send data.
DCD
(Data Carrier Detect)
The LED lights when the Business Communications Manager is receiving a carrier
signal.
DSR
(Data Set Ready)
The LED lights when the DDI Mux is ready to communicate.
TM
(Test Mode)
The LED lights when the DDI Mux is signaling to the DTE that it detects a test
condition.
(Power) On indicates that the DTM is receiving +5 volts.
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