Traditional T1 signals have a very short range (up to 6,000 ft)
By using Loop Telecom FOM cards inside of Loop-AM3440-A units and transmitting over a fiber optic line, ranges up to 50 km (31 miles) are easily achievable without sacrificing reliability. The illustration below shows the path that a signal will take. A key point of this application is that Channel Associated Signaling (CAS) must be on when there are voice channels involved.
An incoming T1 signal arrives at the AM3440 #1 T1 card. Each T1 channel there is mapped to a selected FOM Card E1 Channel. For example in the diagram above, T1 Channel 1 is mapped to the selected FOM channel, FOM E1 #1. The signal is then transmitted over fiber to the FOM Card of AM3440 #2, where the process is reversed allowing T1 signals to leave at AM3440 #2.