TM 11-7025-221-10
3-4. Activate Loopback Option Procedure
Perform the procedures in a and b below to activate Ioopback option using alternate memory. When performing
the procedures, you will need the configuration data entered in the primary memory for the local roux.
If you are operating as a nodal, you wiII also need the configuration data entered in the primary memory
for each operating demux that will not be placed in Ioopback.
a. TD-1337(V)/G Configuration for Loopback. Perform the following steps to operate the TD-1337(V)/G
in a Ioopback configuration. These procedures can be performed without affecting the flow of user traffic
until step 5 is performed.
NOTE
When this procedure is performed, any configuration data previously
entered in the alternate memory is erased. Therefore, if alternate
memory contains valid configuration data, insure that a record of
the configuration data is available so that data can be reentered
in the alternate memory after Ioopback operation is completed.
Loopback Option Procedures
Procedures
Step
1
Enter local mux configuration data in alternate memory using same data as entered for local
mux in primary memory. Use paragraph 2-27 (for V1 or V2 model) or paragraph 2-28 (for
V3 or V4 model) and the special instruction listed below.
enter the same configuration data when performing substeps a and b with the one exception
listed below.
When performing substep b (port assignment) for a demux that is placed in Ioopback, assign
the same port number as the port being designated by prompt.
Example: If prompt is designating (pointing at) port "3", enter a "3" for substep b. If prompt
is designating port "5" enter a "5" for substep b. (Always enter the same demux
assignment for substep a as entered in primary memory configuration.)
NOTE
Use step 2 when TD-1337(V)/G is operating as a nodal and one or more
active demux's will not be placed in Ioopback. Otherwise, go to step 3.
2
For each demux not placed in Ioopback, enter same Rmux configuration data in alternate memory
that is entered in primary memory by performing Rmux minimum configuration routine in paragraph
2-29.
3
Perform demux Ioopback option procedures in b below for each demux to be placed in Ioopback.
Then proceed to step 4.
4
Notify local users and remote TD-1337(V)/G's in network that:
q One or more demux's in local TD-1337(V)/G are being placed in Ioopback.
q Traffic flow is going to be momentarily interrupted while mode change routine is performed.
q Local user's associated with demux's placed in Ioopback will have their own data group
outputs looped back to their inputs.
q Supergroup inputs to local TD-1337(V)/G that are applied to demux's placed in Ioopback
will not be processed.
3-5
