Specifications

D8E1T1 Installation and Operation Manual Chapter 4 Troubleshooting and Diagnostics
Diagnostic Loops 4-11
User-Defined Loop
A User-Defined Loop is similar to a Smart Jack Loop. It allows you to place remote
equipment into loopback by sending a specific code to the equipment. The proper
code needs to be obtained from the remote equipment’s manufacturer or
operator. Several elements of the code can be defined, such as the length and
value for both the activate and deactivate code.
1. From the Loop Selection Menu, either place the cursor on the NI Loop Type
field and press <Enter> to cycle through the choices until User Defined is
displayed OR press U (hot key).
2. Next, press X to select the loop. The User Defined Loop parameter selection
fields appear:
Link: 1
Loop Select Screen
------------------
NI Loop Type..: User Defined
Backplane Loop: Off
Length Value
------ -----
Activate Code..: 5 bits 00001000
Deactivate Code: 6 bits 00100100
Unframed.......: Yes
Notes: - Loop code uses 4,5,6 or 7 high order bits of the code value.
- Bit 7 is transmitted first.
- Unframed code overwrites the framing bits.
Figure 4-8. User Defined Loop Select Screen
3. Enter the remote loopback codes as specified by the remote equipment’s
manufacturer or operator. Refer to the field descriptions in Table 4-7 to assist
you in setting up a User- Defined Loop.
You must configure the corresponding activate and deactivate codes prior to
activating the loop, otherwise the loop will not be activated.
4. Once the parameters of the loop have been defined, press X to save and
activate the loop command. When the Process Loop Command Prompt
(Figure 4-6) appears, press Y. The loop command will be sent to the remote
equipment.
Note