Specifications

Chapter 5 Troubleshooting and Diagnostics FOM-40 Installation and Operation Manual
5-6 Inverting Signal for V.54 Compatibility
ERR
ERR
Pattern
Generator
Pattern
Generator
PATT
Pressed
(Disconnects External BERT)
PAT
T
Pressed
(Disconnects External BERT)
Line
Interface
Line
Interface
FOM-40 FOM-40
Pattern
Tester
Pattern
Tester
Figure 5-5. BER System Test (Two-BER Test)
5.3 Inverting Signal for V.54 Compatibility
In FOM-40 a proprietary protocol inverts signal data relative to a regular V.54.
The new version of FOM-40 allows you to reinvert the signal data, to ensure
compatibility with V.54.
Signal inversion is not available on older V.54 units. If one of your units, either local
or remote, is an older version, do not invert the signal data on the newer unit, to
ensure compatibility with the older unit.

To invert the signal for V.54 compatibility:
1. Open the local FOM-40 and set switches SW6/1–2 to ON. Close the unit.
2. Open the remote FOM-40 and set switch SW6/1 to ON. Close the unit.
Note