Multitech MMH900, User Manual

Page: 106 / 200

106
Chapter 7 - Troubleshooting Procedures
7.5 Channel Device Testing
The first step in system testing is to check the operation of the
multiplexer network section from each channel device to the MultiMux
and back again to the channel device. These procedures will enable you
to see that data from the channel device is passing through the MultiMux
properly by echoing channel keystrokes through the MultiMux and then
displaying them as correct characters on the channel device’s monitor.
Table 7-2. Channel Device Testing Procedure
Note: This procedure will result in the echoing of data entered on each
channel device keyboard to its respective monitor.
1 Place the local MultiMux unit in Test Mode 4* (i.e., executing the
Analog Loop test) by entering the following command. If using
external modem this test does not apply.
AT&T4 (hit Return)
The supervisory console will display the following message:
ANALOG LOOP - TEST #4
2 Enter data on the keyboard of each channel device and, if the local
portion of your network is operating correctly, the data will be
correctly displayed on each channel device monitor.
If the channel device is equipped with a local echo feature that is
active, or if Echoplex is turned on for that channel, double characters
will be displayed indicating that the MultiMux is correctly echoing
data.
3 When you have verified that the channel devices are operating
correctly, enter the following to end the test:
ATZ (hit Return)
or
AT&TO (hit Return)
Note: The MultiMux must have downline loading turned off when doing
channel device testing.