CHAPTER 7: Diagnostics and Troubleshooting
51
2. Configure the asynchronous channel to match
your terminal equipment. Refer to
Chapter 4
or
Chapter 5
for configuration details.
3. Put the Multiserver 500 into local data
loopback:
a. From the Command Port, enter:
>DI LOCD <cr>
or
b. From the LCD/keypad, select from the
diagnostic menu:
Main Menu
Diagnostics
Local Data
4. Verify that the TM indicator light goes on.
5. Type any data on the terminal connected in step
1, and verify that the data is echoed back as
typed.
6. Terminate the local data loopback test as
described in
Section 7.2
. Verify that the TM
indicator light goes off.
7.2.5 L
OCAL
C
OMPOSITE
L
OOPBACK
T
EST
The main purpose of the local composite loopback
test is to verify that the Multiserver 500 is capable of
multiplexing voice and data—and to produce a
composite stream for transmission to the remote
end.
In addition, the local composite loopback test
verifies the proper operation of the local voice/fax
digitizer.
Test Setup and Signal Flow
Depending on the voice/fax interface module type
installed in your Multiserver 500, the local
composite loopback test may involve three different
setups: FXS, E&M, and FXO. Figure 7-4 shows the
test setup and signal flow in a local composite
loopback test for a Multiserver 500 fitted with an
FXS type voice/fax interface module. See “Notes
on FXO and E&M Interfaces” (page 53).
Procedure
1. Connect an asynchronous terminal to the DATA
CHANNEL connector of the Multiserver 500.
2. Configure the data channel for asynchronous.
Configure the asynchronous channel to match
your terminal equipment. Refer to
Chapter 4
or
Chapter 5
for configuration details.
3. Connect a telephone set to the FXS connector
on the voice/fax interface module.
4. Put the Multiserver 500 into local composite
loopback:
Serial
I/F
Module
Multiserver 500
Figure 7-3. Local Data Loopback Test.
